Question # 1

Diffraction pattern has also been observed for:

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Proton

Neutron

Hydrogen atom

All of them

In multi-mode step index optical fibre, that layer is called cladding which has

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higher refractive index

lower refractive index

both of them

none of them

The magnetism produced by electrons within an atom is due to

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Spin motion

Orbital motion

Spin and orbital motion

None of these

Each domain contains the atoms of range of

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10^-10 to 10¹⁸

10¹⁰ to 10¹⁶

10¹² to 10¹⁷

10¹² to 10¹⁶

A grating with high resolving power can distinguish ______ difference in ______

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Smaller, amplitude

Greater, wavelength

Smaller, wavelength

Greater, intensity

The kinetic energy acquired by a mass m in traveling a certain distance d.starting from rest. under the action of a constant force is directly proportional to

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√m

Independent of m

1 / √m

m

If a transverse wave has a speed of 10 m/ sec and frequency of 10 cycle/ sec itswavelength is:

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1 m

10^-2 cm

10 m

10 cm

The smallest portion of a crystal lattice that if repeated in three-dimensions will generate the entire lattice is called:

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Unit cell

Lattice plane

Crystal

None of these

If two non zero vectors A and B obey the relation |A + B| = |A - B|.then the angle between them is:

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120°

90°

60°

0°

The regular array of atoms in a crystal has spacing of the order of

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10^-16m

10^-14m

10^-10m

10^-6m

If the wavelength of light used in Michelsion's interferometer is 400 nm and the moveable mirror only moved throughλ/4, then the length moved will be

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10 nm

10^-2mm

1 nm

10^-4mm

In Compton effect, it was considered that X-rays consist of:

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Electrons

Positrons

Photons

All of these

In spectrometer the function of collimator is to produce

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Diverging beam of light

Converging beam of light

Parallel beam of light

None of these

The value of solar constant in SI system is

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1340 watt/m²

1340 m²/watt

1340 watt/m

A body starting from rest covers a distances of 0.45 km and acquires a velocity of 300 Kmh^-1its acceleration will be

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7.71 m s^-2

0.5 m s^-2

0.15 m s^-2

0.092 m s^-2

The wavelength of refractive wave in a denser medium is

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Same as that of the incident wave

Become smaller than the incident

Becomes greater than the incident wave

None of these

Essential characteristic of equilibrium is:

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Momentum equal to zero

Acceleration equal to zero

Kinetic energy equal to zero

Velocity equal to zero

Which of the given elements is a diamagnetic material

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Antimony

Bismuth

Copper

All of these

𝑎, 𝖰 𝒂𝒏𝒅 radiations come out of radioactive substance:

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Spontaneously

When it is put in a reactor

When it is heated

Under pressure

Turn table is the plateform over which we place

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Diffraction grating

Prism

Glass slab

a and b

The image of the tip of a needle is never sharp because of

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Polarization of light

Interference of light

Diffraction of light

Reflection of light

Swimming is possible on account of

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First law of motion

Second law of motion

Third law of motion

Newtons law of gravitation

A photo cell is based on:

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Compton effect

Pair production

Photo cell

All of these

The typical wavelength of the signal which we sent in the optical fibre is

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1000 nm

100 m

1.3 mn

1.3μm

The projectile is the motion which is

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One dimensional

Two dimensional

Three dimensional

None of these

The diffraction is found to be prominent when the wavelength of light is

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small as compared with the size of obstacle

large as compared with the size of obstacle

equal as compared with the size of obstacle

Very small as compared with the size of the obstacle

The uniformly accelerated equations are useful only for

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Angular motion

Curved motion

Linear motion

None of these

Find the range of the projectile, having speed 30 ms^-1in a direction 30° above the horizon

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50 m

80 m

90 m

100 m

At high altitude the blood flows out of nose and ear because

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The blood pressure increases at high altitudes

The percentage of oxygen in the air increases

The atmospheric pressure decreases there

The density of blood decreases at high altitudes

The band above the valence band is

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Completely filled band

Conduction band

Forbidden energy band

None of these

Geometrical optics cannot give following characteristics for a microscope

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Image position

Image size

Resolution of image

Any of the above

One erg is equal to

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10⁵j

10^{7 j}

10^-3 j

10^-7j

The SI unit of torque is

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Nm^-1

Nm^-2

Ncm

Nm

The drag force increases as the speed of the object

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Decreases

Increases

Decreases rapidly

None of these

The speed of efflux is equal to the velocity gained by the falling fluid under the action of gravity through a certain height is known as

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Equation of continuity

Bernoulli s equation

Torrucelli s Theorem

Venturi s relation

A beam of light of wavelength is incident normally on a grating of element d the angle between the zero-order and first -order spectra depends on

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λ only

d only

λ and d

λ d and distance of screen from the grating

When a silicon crystal is doped with pentavalent impurity which are

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Boron

Antimony

Gallium

None of these

The maximum range of the projectile is the horizontal distance covered is

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Maximum

Distance

Minimum

None of these

In which mode, the refractive index steps down form 1.52 to 1.48 at the boundary with the cladding?

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Single mode step index

multimode step index

multimode graded index

all of them

The SI unit of stress is

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Nm²

Nm

dynesm^-1

N

The speed of light in a medium depends upon

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Its wavelength

Its frequency

Refractive index

All of these

A steel bar can bear a load of 20 tons. If the thickness of bar is double, then for the same depression it can bear a load of:

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40 ton

80 ton

160 ton

5 ton

A wire breaks of stretched by more than 3mm. It is cut into equal parts. Then each part can be stretched with out-breaking by

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0.75 mm

1.5 mm

3.0 mm

6.0 mm

The minimum energy required by an electron to eject from metal surface is known as:

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Photo energy

Critical energy

Threshold energy

Work function

The energy stored in a wound watch spring is

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K.E

P.E

Heat energy

Chemical energy

Polaristion is a phenomenon associated with a certain type of wave.

Which condition must be fulfilled if the wave is to be polarised?

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It must be a longitudinal wave

It must be a light wave

It must be a transverse wave

Moment of inertia does not depend upon

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Angular velocity

Mass

Position of axis of rotation

None of these

The forbidden energy band gaps in conductors semiconductors and EG,EG₂ and EG₃respectively The relation among them is

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EG₁ = EG₂ = EG₃

EG₁ < EG₂ < EG₃

EG₁ > EG₂ > EG₃

EG₁ < EG₂ > EG₃

Which of the following frequency ranges includes most of the electromagnetic waves emitted by the ultra - violet tubes used in a sun bed?

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5 x 10⁵ to 5 x 10⁸ Hz

5 x 10⁸ to 5 x 10¹¹ Hz

5 x 10¹¹ to 5 x 10¹⁴ Hz

5 x 10¹⁴ to 5 x 10¹⁷ Hz

Minimum number of unequal forces whose vector sum can be zero is

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3

4

2

5

Television signal are converted into light signals by

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Decoder

Transistor

Photodiode

Optical fibre

A convex lens of focal length 5 cm is used as magnifying glass Its magnifying power when the image is formed at infinity

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6

5

1.5

7

On heating, it becomes a very viscous liquid at almost

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500 C^o

800 C^o

900 C^o

1000 C^o

If solid sphere and solid cylinder of same mass and density rotate about their own axis,the moment of inertia will be greater for

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Solid sphere

Solid cylinder

Both

Equal both

Spherical balls of radius 'r' are falling in a viscous fluid of viscosity 'η' with a velocity 'v'. The retarding viscous force acting on the spherical ball is

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Inversely proportional to both r and v

Directly proportional to both r and v

Directly proportional to r but inversely proportional to v

Inversely proportional to r but directly proportional to v

The velocity of light in vacuum can be changed by changing

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Frequency

Amplitude

Wavelength

None of these

The concept of entropy was introduced in the thermodynamics by

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kelvin

Clausius

Carnot

None of these

In an inelastic collision

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Both K.E and momentum are conserved

Both K.E and momentum are not conserved

Momentum is conserved and K.E is not conserved

K.E is conserved and momentum is not conserved

If the volume of a gas is to be increased four times then

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Its temperature must be doubled

At constant temperature its pressure must be decreased four times

At constant temperature its pressure must be increased two times

It cannot be increased

According to Einsteins theory, gravity follows the inverse square law expect in

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Weak gravitational field

Strong gravitational field

Very very weak gravitational field

None of these

The distance between different interference fringes are:

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Variable

Same

Different

None of these

When a body is moving with uniform positive acceleration, the velocity-time,then the body is said to have

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uniform deceleration

uniform negative acceleration

average acceleration

uniform positive acceleration

Period of visible light waves is

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2 × 10^-10 sec

2 × 10^-11 sec

2 × 10^-14 sec

2 × 10^-15 sec

The original source of geothermal energy is

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Biomass

Fossil fuels

Moon

Earth

The valency of electron in the valence band is known as

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Atom

Molecule

Hole

None of these

Which one of the following is polymer

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Polythene

Polystyrene

Nylon

All

The approximate efficiency of Nuclear power plant is

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20 - 30%

30 - 35%

33 - 40%

37 - 42%

High energy physics is the physics of

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Nucleus

Subatomic particles

Plasma physics

Astrophysics

A shortsighted person can see clearly

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Near objects

Far objects

Objects at 25 cm

Objects at infinity

The energy dissipated per cycle for iron in hysteresis loop is

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less than for steel

equal to the steel

more than the steel

any one of them

What thermodynamic temperature is equivalent to 501.85°C

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775.01 K

228.85 K

775.00 K

228.70 K

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15 m is

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9 x 10⁵ V

9 V

8 x 10⁶ V

80 V

At systolic pressure, at the point the first surges of blood flow through the narrow stricture produces

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High flow speed

Sound heard

Initially turbulent

All of these

If the slits in YDS experiment are made closer, fringe spacing will

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Increase

Decrease

Remain same

None of these

A glass plate on which a large number of very fine equidistant parallel lines are drawn is called

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convex lens

thin film

diffraction grating

interferometer

The speed of a falcon in a dive is

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23 ms^-1

37 ms^-1

40 ms^-1

43 ms^-1

In case of linear deformation, the ratio of the tensile stress to the tensile strain is called

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Young's modulus

Bulk modulus

shear modulus

all of them

Generally thermometers make use of the fact that most of the liquids

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Compress on heating

Expand on heating

Evaporate on heating

Sublime on heating

Bernoulli s equation is the fundamental equation in fluid dynamics that relates pressure to

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Height of fluid column

Fluid speed

Both of these

None of these

Change in entropy is positive when heat is

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Removed

Added

Remains as is it

None of these

When the fluid is incompressible, for which the density is

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Constant

Change

Both

None of these

Two boats moving parallel in a river

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Are pulled towards each other due to less pressure in between them

Get part due to increases in pressure in between them

Remain always parallel as there is no change in pressure

None of these

In Michelson's interferometer , the plates are placed in front of incident ray at an angle of:

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45^o

60^o

90^o

120^o

The fluid which is incompressible and have streamline flow is called _________ fluid

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Ideal

Viscous

Non ideal

None of these

The ratio of nuclear magneton and and Bohr magneton is

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m_e/m_p

m_p/m_e

m_e/m_p

2m_p/m_ez

When a movable mirror moves λ/4 distance and the light used is 400 nm, then the distance measured highly precise is

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100 nm

10^-4 nm

10^-6 nm

10^-5 mm

When crest of one wave coincides with the trough of the other wave, it give rise to

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dispersion

constructive interference

destructive interference

polarization

The dimensional formula for the modulus of elasticity is same as that for:

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Stress

Strain

Velocity

Surface tension

The amplitude of oscillation of each atom in a metallic crystal rises with the

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rise in temperature

decrease in temperature

even temperature remains constant

all of them

A typical rocket consumes about

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100 kg s^-1of fuel

1000 kg s^-1of fuel

10000 kg s^-1of fuel

100000 kg s^-1of fuel

The specific resistance of a wire varies with its:

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Length

Cross-section

Mass

Material

Which will be more effective in knocking a bear down

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A rubber bullet

Lead bullet of same momentum

A wood bullet

None of these

How many phone calls can be carried by single mode step index fibre

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25000

96000

14000

21000

The escape velocity of mercury in Kms^-1

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1.29

3.24

4.02

4.3

The more viscous liquids is

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Coal tar

Honey

Kerosene oil

Water

Experimental demonstration of wave nature of light was given in 1801 by:

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Newton

Maxwell

Thomas young

Compton

In a laminar flow of non-viscous fluid along a horizontal pipe,the work done per second by the pressure at any section is equal to

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The pressure

Pressure x volume per second

Pressure x area of cross-section

Pressure x volume

The kinetic energy of a body is four times its momentum its velocity is

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2ms^-1

4ms^-1

8ms^-1

16ms^-1

The danger signals are red while the eye is more sensitive to yellow because

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Scattering in yellow colour is less than that of red

Red light is longer in wavelength than yellow light

Scattering in red is less than that of in yellow

Red colour has greater frequency than yellow light

A magnetic field

Choose an answer

Always exerts a force on a charged particle

Never exerts a force on a charged particle

Exerts a force on a charged particle if it is moving across the magnetic lines of force

Exerts a force on a charged particle if it is moving along the magnetic lines of force.

The mother and daughter elements with the emission of 𝖰 − 𝒓𝒂𝒚𝒔, are called:

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Isotopes

Isobars

Isomers

Isodiapheres

The length of a telescope is 36 cm.The focal lengths of its lenses can be

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30 cm,6 cm

-30 cm,-6 cm

30 cm,-6 cm

-30 cm,-6 cm

A force of 10 N displace an object by 10 m.If work done is 50 J then direction of force makes an angle with direction of displacement.

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120°

90°

60°

None of these

The number of electrons in a nucleus X of atomic number Z and mass number A is:

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A

W

Z

Y

The displacement coincides with the path of motion when a body moves along a

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Straight line

Curved path

Zig Zag path

None of these

The work done in moving a positive charge of two coulombs from one point to another point when the potential difference between them is 5 volt.

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5 Joules

10 Joules

15 Joules

20 Joules

An artificial satellite travels in a circular orbit about the Earth. Its rocket engine is then fired and produces a force on the satellite exactly equal and opposite to that exerted by the Earth gravitational field. The satellite would then start to move

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A long a spiral path towards the Earths surface

A long the line joining it to the centre of the Earth (i.e radially)

A long a tangent to the orbit

In a circular orbit with a longer period

With the help of interferometer, we can find the

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Wavelength

Frequency

Phase

None of these

The ultra-purity of optical fibre is

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90 %

99 %

99.9 %

99.99 %

A prism splits a beam of white light into its seven constituent colors.This is so because

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Phase of different colors is diferent

Amplitude of different colors is different

Energy of different colors is different

Velocity of different colors if different

Any person like an airline pilot, sailor can find his position on Earth surface by pocket size instrument within accuracy of

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5 m

10 m

10.5 m

11 m

The dimension of elastic modulus

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ML^-1T²

MLT²

ML^-1T²

MLT³

Rotational kinetic energy of a disc is

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K.E. _rot = 1/2 mV²

K.E. _rot = 1/3 mV²

K.E._rot = 1/4 mV²

None of these

In semiconductors, at 0 K, the electrons in conduction band is

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Partially filled

No

Yes

None of these

In time of flight, the body the covers the distance

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Maximum

Zero

Minimum

None of these

The correct unit of electric current in SI system is

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Ampere

Ampere/sec

Coulomb sec

Coulomb / meter

Newtons laws are suitable, for as compared to velocity of light

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Low speed

Very low speed

Very high speed

None of these

A women of 50 kg distributes her wright equally over high-heeld shoes. Each heel has an area of 0.75 cm². The pressure exerted by each heel will be

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6.66 x 10⁶ Pa

3.33 x 10⁶ Pa

1.67 x 10⁶ Pa

3.33 x 10^-6 Pa

Laws of motion are valid in a frame which is

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Uniform motion

Inertial

Both a and b

None of these

When an electron is accelerated through a P.D of one volt it will acquire energy equal to

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One joule

One erg

One electron volt

None of these

Diffraction effect is

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More for a round edge

More for a sharp edge

Less for a sharp edge

None of these

Which one of the following is nearly monochromatic

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Light from candle

Light from simple lamp

Light from sodium lamp

Light from sun

There is a certain frequency below which no electrons are emitted from the metal surface, this frequency is known as:

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Critical frequency

Threshold frequency

Maximum frequency

Minimum frequency

The typical speed of human running is

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1 ms^-1

2 ms^-1

4 ms^-1

5 ms^-1

The property of bending of light around obstacies is called

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interference

reflection

diffraction

polarization

Longitudinal waves do not exhibit

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Refraction

Reflection

Diffraction

Polarization

Spherical aberration can be reduced by using

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Convex lens

All the portions of the lens

Central portion of the lens

Upper portion of the lens

If the instantaneous velocity of a body does not change, the body is said to be moving with

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average velocity

uniform velocity

instantaneous velocity

variable velocity

A cold soft drink is kept on the balance.When the cap is opened then the weight

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Increases

Decreases

First increases then decreases

Remains same

Dimension of impulse is same as that of

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Force

Torque

Momentum

Angular momentum

George Stoke found the effect of viscous drag on small sphere falling through liquids in

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1782

1851

1902

1947

Bulk modulus for mercury is

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27

29

29.4

30

In photoelectric effect, electrons are emitted with:

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Same energy

Different energies

Both (a) & (b)

Intermittent energies

Which of the following is not a projectile?

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a bullet fired from a gun

a spaceship

a football in air

an artillery shell

The dimensional formula for angular momentum is:

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(M°L²T^-2)

(ML²T^-1)

(MLT^-1)

(ML²T^-2)

A body of mass 5 kg initially at rest is moved by a force of 2 N on smooth horizontal surface.The work done by the force in 10 s is

Choose an answer

20 j

30 j

40 j

60 j

In Multimode step index fibre the refractive index from its centre to the boundary is

Choose an answer

1

1.55

1.52

1.43

A typical collector which absorbs energy directly from solar radiation upto about

Choose an answer

40 ^oC

70 ^oC

80 ^oC

90 ^oC

The constant K in Coulomb's Law depends upon

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Nature of medium

System of units

Intensity of charge

a & b

The resultant of two forces.one double the other in magnitude,is perpendicular to the smaller of the two forces.The angle between the two forces is

Choose an answer

120°

60°

90°

150°

Once heat is transferred to an object, it is converted into the

Choose an answer

Entropy of the object

Internal energy of the object

Temperature of the object

None of these

The terminal velocity of for a water droplet of radius 10^-5 m is of the order of

Choose an answer

1 cm/s

1 mm/s

1 nm/s

1 μm/s

Law of conservation of momentum has been verified for the

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Cosmological level

Microscopic level

Submicroscopic level

a and c

The efficiency of a practical heat engine:

Choose an answer

Can be 100%

Can not be 100%

Is always Zero

None of these

The speed at which light travels within the material depends upon

Choose an answer

Refractive index of medium

Wavelength

Frequency

Intensity

Viscus force depends upon

Choose an answer

Coefficient of viscosity

Velocity of objects

Radius of object

All of these

To cover the whole of the populated Earth surface, there required the correctly positioned satellite at the longitude of

Choose an answer

60^o

120^o

180^o

45^o

Wave front is the locus or all points in vibration are in the same

Choose an answer

Frequency

Phase

Wavelength

All of these

The computer chips are made from

Choose an answer

Semiconductor

Conductor

Silicon

Sand

One Pascal in SI is equal to

Choose an answer

One newton metre

One newton metre^-1

One newton metre^-2

One dyne cm²

S.I unit of stress is

Choose an answer

N/m

N m

Nm^-2

newton

The SI unit of gravitational constant G is:

Choose an answer

m³kg^-1s^-2

m²kg^-2

Jmkg^-1

None of these

The final image obtained by astronomical telescope is

Choose an answer

Inverted w.r.t object

Magnified

Virtual

All of them

The product of force and time is called

Choose an answer

Momentum

Force

Impulse

None of these

In newton's rings apparatus, we also use:

Choose an answer

Spectroscope

Telescope

Microscope

Any of these

When m₂>> m₁and V_{2 = 0 then result of their velocities}

Choose an answer

V₂= 0 and V₁= V'₁

V'₁= -V₁and V'₂= 0

V₁= V₁and V₂= 0

None of these

Approximate power of flash light in watts: (2 cells)

Choose an answer

1.2

1.5

1.55

1.56

X-rays is a type of electron magnetic radiations of much shorter wavelengths of the order of

Choose an answer

10^-8 m

10^-9 m

10^-10 m

10^-12 m

If the moveable mirror in Michelsion's interferometer moves a distanceλ/2, the path difference changes by

Choose an answer

λ/4

λ/2

λ

3/2λ

Which electromagnetic wave would cause the most significant diffraction effect for an atomic lattice of spacing around 10^-10m?

Choose an answer

microwave

infrared

ultraviolet

X-ray

Is there any physical distinction between the valence and conduction band

Choose an answer

Yes

No

Very small

None of these

The ratio of the diameter of two convex lenses is the ratio of their focal lengths

Choose an answer

Greater than

Less than

Equal to

None

A ball falls on the surface from 10 m height and rebounds to 2.5 m.If the duration of contact with the floor is 0.01 seconds then the average acceleration during contact is

Choose an answer

2100 m/s²

1400 m/s²

700 m/s²

400 m/s²

If L and R represent inductance and resistance respectively,then dimensional formula of L/R will be

Choose an answer

ML°T°

M°L°T

M°L°T^-2

M°LT^-2

The critical temperature of aluminum is

Choose an answer

1.18 K

4.2 K

3.72 K

7.2 K

A body of mass 5 kg, initially at rest is moved by a force of 2 N on smooth horizontal surface the work done by the force in 10 s is

Choose an answer

20 j

30 j

40 j

60 j

X-rays interact with

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solid crystal

atoms in the crystal

nuclei of atoms in the crystal

electrons of atoms in the crystal

Acceleration of a body at any particular instant during its motion is known as

Choose an answer

average acceleration

uniform acceleration

instantaneous acceleration

all of them

Rudolph clausius gave the quantitative basis for the second law in

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1881

1870

1856

1840

If 'd' is the total displacement of the body in time 't' then the velocity during this interval t is

Choose an answer

Initial velocity

Variable velocity

Average velocity

None of these

Petrol engine converts heat energy to work roughly

Choose an answer

20%

25%

30%

40%

A steel wire 12 mm in diameter is fastened to a log and them pulled by a tractor. The length of stire between the log and tractor is 11 m. The force of 10,000 N is required to pull the log. What is stress

Choose an answer

84.46 MPa

85.46 MPa

88.46 MPa

89.46 MPa

The energy of molecular motion appears in the form of

Choose an answer

Friction

Heat

Viscosity

Potential energy

The path difference involved in interference in thin films depends upon

Choose an answer

Thickness and nature of thin films

Angular of incidence of light

Nature of media on both sides of thin film

All of these

Two forces are such that the sum of their magnitudes is 18 N and their resultant is perpendicular to the smaller forces and the magnitude of resultant is 12.Then the magnitude of the forces are

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12 N,6 N

13 N,5 N

10 N,8 N

16 N,2 N

If the force applied is F and the velocity gained is v,then the power developed is

Choose an answer

F/v

v/F

FV

Fv²

The value of young's modulus is maximum for:

Choose an answer

Dimond

Copper

Ice

Mercury

Water

A cylinder cannot roll on

Choose an answer

A rough horizontal plane

A smooth horizontal plane

A rough inclined plane

A smooth inclined plane

In an interference pattern of Young,s Double Slit (YDS) experiment

Choose an answer

Bright fringes are wider than dark fringes

Dark fringes are wider than bright fringes

Both dark and bright fringes are of equally spaced

Central fringes are wider than the outer fringes

A ball is dropped vertically down and it takes time t to reach the ground.At time t/2:

Choose an answer

The hall had covered exactly half the distance

The velocity of the ball was V/3 where V is the velocity when it reached the ground

The ball had covered less than half the distance

The ball had covered more than half the distance

How many major components of fibre optic communication system are

Choose an answer

4

5

3

2

The approximate efficiency of solid state laser is

Choose an answer

35%

30%

27%

23%

Which of the following is an example of Brittle substances?

Choose an answer

Copper and Brass

Brass and glass

Copper and glass

Only glass

Physics deals with the study of

Choose an answer

Matter and Energy

Outer atmosphere

Matter and Energy and their relationship

None of these

In an optical fibre the speed of light is

Choose an answer

Directly proportional to its refractive

Inversely proportional to its refractive inedex

Independent of refractive index

Directly proportional to square of refractive index

An un-power and un-guided missile is called a

Choose an answer

rocket

ballistic missile

guided missile

none of them

When the light waves of the same frequency and amplitude travelling in the same direction superimose each other , they give rise to

Choose an answer

interference

diffraction

dispersion

polarization

A human eye can detect the electromagnetic radiations of the type:

Choose an answer

Infrared radiations

For- infrared radiations

X-rays radiations

Red radiations

Solar energy at normal incidence outsides the Earth atmosphere is about

Choose an answer

1.043 Wm^-2

1.2 Wm^-2

1.4 Wm^-2

1.67 Wm^-2

Which one of the following can act approximately as a source of monochromatic light

Choose an answer

Neon lamp

Fluorescent tube

Sodium lamp

none of these

A motor runs at 20 rev/s and supplies a torque of 75Nm. Power delivered by it is

Choose an answer

6.12 hp

12.6 hp

7.3 hp

8.3 hp

The time rate of change of velocity is called

Choose an answer

Initial velocity

Uniform velocity

Accelerations

None of these

A body moving with uniform velocity has

Choose an answer

positive acceleration

negative acceleration

infinite acceleration

zero acceleration

When two objects come to common temperature, the body is said to be in:

Choose an answer

Static equilibrium

Dynamic equilibrium

Thermal equilibrium

None of these

When relatively simple molecules are chemically combined into massive molecules, the reaction is called:

Choose an answer

Fission reaction

Fusion reaction

Polymerization reaction

Any of these

None of these

The orbital radius as the revolving body is revolving is

Choose an answer

Very Smaller

Larger

Smaller

None of these

A long solenoid has 20 turns/ cm. The current necessary to produce a magnetic field of 20 mellites inside the solenoid is approximately:

Choose an answer

1A

2A

4A

8A

Which of the following is not an advantages of using optical fibres over copper cables?

Choose an answer

signal attenuation

number of signals carried per wire

cost of installation

none of the above

The centre of gravity of an object is

Choose an answer

The force of gravity on the object

The point about which the object rotates

The point at which the total weight of the object act

none of these

The typical speed of has working aunt is

Choose an answer

0.1 ms^-1

0.01 ms^-1

0.001 ms^-1

0.025 ms^-1

Where the intensity of gravitational field of earth is maximum

Choose an answer

Center of earth

Equator

Poles

Same every where

Which of the following air pollutant is called quiet killer

Choose an answer

PAN

CO

NO₃

SO₃

If increase in temperature and volume of an ideal gas is two times, then the initial pressure P changes to

Choose an answer

4P

P

2P

3P

Digestion of carbohydrates begins in the:

Choose an answer

large intestine

small intestine

duuoderium

beccal cavity/mouth

The structure of a polymer depends upon how the monomer-repeating unit joins to make a polymer. What is not the type of structure of a polymer

Choose an answer

Synthetic polymer

Linear polymer

Branched

Cross linked or inter connected polymer

The substance used in the soil to provide element.Which are essential for plant growth are known as:

Choose an answer

manures

fertilizers

pesticides

additive

Ozone in stratosphere extends upto km:

Choose an answer

0-15 km

10-15 km

15-40 km

15-25 km

The simplest separating unit of a polymer is called:

Choose an answer

Monomer

Dimer

Trimer

Macromer

In aldehydes and ketones carbon of carbonyl group is;

Choose an answer

sp³ hyhridized

sp² hybridized

sp hybridized

un hybridized

In metallic crystals the atomic orbitals combine to produce a large number of closely bands of energy according to

Choose an answer

electron pool theory

molecular orbital theory

valence bond theory

electrostatic force of attraction

Water cover earth surface more than:

Choose an answer

50%

60%

70%

80%

Hydrolysis of protein by 6M HCl gives peptides and then alpha-amino acids. How many alpha-amino acids molecules are obtained on the hydrolysis of a tetrapeptide

Choose an answer

2

3

4

5

Which of spectral lines when atoms are subjected to strong electric field is called:

Choose an answer

Compton effect

Stark effect

Zeeman effect

Photoelectric effect

Which compound is not formed as a result of reaction between acetic acid & HI & red phosphorous

Choose an answer

Ethanol

Water

lodine

Ethane

Which of the following alkyl halides shows higher reactivity?

Choose an answer

R __ F

R __ CI

R __ Br

R __ I

_{What is name of hydrated variety of quartz?}

Choose an answer

Rose quartz

Smokey quartz

Silica

Opal

The word polymer is derived from words poly mean many and mer means unit.

Choose an answer

Latin

Greek

English

French

The specifie substance (metabolite) that fits on the enzyme surface and is converted to products is called

Choose an answer

Co-factor

Isoenzyme

Prosthetic group

Substrate

At STP,a container has 1 mole of Ar,2 moles of CO₂,3 moles of O₂ and 4 moles of N₂.Without changing the total pressure if one mole of O₂ is removed,the partial pressure of O₂

Choose an answer

Is changed by about 26%

Is halved

Is unchanged

Change by 33%

The original volume of a gas at 0° is 273 cm³at constant pressure, its volume at 273°C becomes

Choose an answer

zero cm³

546 cm³

446 cm³

346 cm³

During combustion analysis, which one is used for absorbing carbon dioxide:

Choose an answer

50% KOH

5% KOH

Mg(ClO4)2

Silica gel

Tertiary alcohols are the easiest to dehydrate because

Choose an answer

They form stable carbocation

They have less hydrogen

They have bigger size

They are polar

One of the following is a ionic solid. Which is that?

Choose an answer

Fe

KBr

Diamond

Cr

The amount of oxygen in the lithosphere is about

Choose an answer

35.50%

40.60%

46.60%

50.50%

Which one of the following statements is wrong for gases?

Choose an answer

gases do not have a definite shape and volume

volume of the gas is equal to volume of container confining the gas

confirmed gas exerts uniform pressure on the walls of its container in which it is enclosed

mass of gas cannot be determined by weighing a container in which it is enclosed

The boiling point of radon (211 K) is higher than boiling point of Helium (4.4 K) because

Choose an answer

the atomic number of Rn is larger than that of the He

the atomic mass of Rn is larger than that of He

the dispersion forces between Rn atoms are more prominent that between He atoms

Rn atoms are joined by dipole-dipole force whereas He atoms are joined by hydrogen bonding

The working condition/s for SHE

Choose an answer

1atm pressure

1M H-solution

298K temperature

All of these

Starch gives ________ color with iodine:

Choose an answer

blue

red

yellow

green

Which one of the following does not act as pollutant?

Choose an answer

carbon monoxide

sulphur dioxide

hydrocarbons

carbon dioxide

In an elimination reaction a more substituted alkene is formed due to the stability associated with

Choose an answer

Free radical

transition state

Activated complex

Carbocation

Air can be distilled fractionally because the constiltuents of the air:

Choose an answer

have different densities

can be liquefied

are gases at room temperature

have different boiling points

The total number of 3d-series transition elements is

Choose an answer

10

40

14

58

A solid has a sharp melting point slightly above room temperature and is a poor thermal and electrical conductor, its crystal classification by bond type is

Choose an answer

Ionic

Metallic

Molecular

Covalent

In which of the following types of reactions are the carbonyl compounds and alkene are similar in behaviour

Choose an answer

Nucleophilic addition

Electrophilic addition

Nucleophilic suhstitution

Catalytic hydrogenation

Newspaper can be recycled again and again by how many times

Choose an answer

5

4

2

3

d-d transition cannot be observed in

Choose an answer

Cr

Cu

Mn

Zn

The forces present between the ions and water molecules are called:

Choose an answer

dipole-dipole forces

dipole-induced dipole forces

London dispersion forces

ion-dipole forces

Tertiary aleohols producewith acidified KMno,

Choose an answer

Ketones

Aldehydes

Malonic acid

Alkene

The product of the molecular mass of repeating units and the D.P is called of polymer:

Choose an answer

Molecular formula

Empirical formula

Molecular mass

Empirical mass

The electrolyte used in fuel cell is

Choose an answer

КOH

NaCl(aq)

NaNO3

Molten NaCl

Which will not react with phenol

Choose an answer

NaOH

Br2

KMn04/OH-

Na

Glycerin boil at 290°C under normal atmospheric pressure. If the pressure is reduced to 50 mm of Hg, it will boil

Choose an answer

above the given temperature

below the given temperature

at the same temperature

at 25°C

Which of the following will undergo nucleophilic addition reaction more easily?

Choose an answer

Aldehyde

Alkene

Aldehyde and ketone equally

Neither aldehyde nor alkenes

Which of the following statement is not correct for glycogen

Choose an answer

It is main storage of carbohydrates

It structure does not resemble Amylopectin

It has 1 → 4 and 1 → 6 glycosidic linkage

On hydrolysis it yields glucose units

The number of paper industries in Pakistan are

Choose an answer

30

25

35

20

The partial pressure of CH₄and O₂are 500 torr and 100 torr repectively in a 10 dm³vessel at 0°C. The ratio of number of molecules of CH₄: O₂is

Choose an answer

1: 2

5 : 1

5 : 2

2 : 1

The bond angle between any two sp hybrid orbitals is A.109.28°

Choose an answer

107.09°

120°

90°

80°

Which one of the following does not show isomerism?

Choose an answer

Propane

Hexane

Butane

Pentane

Palmitic acid & steanic acid are obtained from process of fats & oils:

Choose an answer

Reducing

Neutralization

Oxidation

Hydrolysis

Ester with raspberry flavor

Choose an answer

Amyl acetate

Isobutyl formate

Amyl butyrate

Octyl acetate

The fiber which is made from acrylonitrile as monomers:

Choose an answer

PVC

rayon fiber

acrylic fiber

Polyester fiber

Ozone is present in layer around earth:

Choose an answer

atmosphere

tropospher

stratosphere

thermosphere

Which thermometer will have its reading 273 degrees greater than that of thermometer C?

Choose an answer

A

B

B has 273 degrees greater than A

C has greater reading than all other thermometers

Silk is the example of:

Choose an answer

mineral fiber

vegetable fiber

animal fiber

none of above

R = 0.08205:

Choose an answer

atm dm³mol^-1k^-1

J mole^-1k^-1

Nm mol^-1k^-1

cal. mol^-1k^-1

Some of crystals are good conductors of heat and electricity, they may be

Choose an answer

ionic in nature

of metallic character

covalent in nature

of molecular nature

The element which shows highest binding energy

Choose an answer

V

T

So

Cr

The ionization energy

Choose an answer

generally increases from left to right in a period

increases from top to bottom in a group

does not change in a period

does not change in a group

Water which his considered to be safe for human consumption is known as

Choose an answer

distilled water

contaminated water

potable water

rain water

Surface and ground water sources are contaminated by various human activities. Which of the following is not human activity that causes contamination in fresh water

Choose an answer

Live stock waste

Oil leaks and spills

Desposal of industrial effluents

Rain

The attractive forces between molecules of a gas and their sizes can be ignored at

Choose an answer

high pressure

low temperature

low temperature and high pressure

low pressure and high temperature

Activity of the enzyme is reduced by

Choose an answer

temperature

concentration

pH

inhibitors

The particles in solids are

Choose an answer

widely separated and moving randomly

widely separated not moving

moving randomly but not separated

close together and vibrating slightly

Molar mass of formic acid in benzene comes out to be

Choose an answer

64

46

32

92

The reagent for alkaline hydrolysis of ethyl bromide to form ethyl alcohol is

Choose an answer

water at room T

Alcoholic KOH+heat

Ethanol + heat

dil. NaOH+ heat

Classification of polymerization into two types was suggested by

Choose an answer

W.H Carothers

Staudinger

OSwald

Aspdin

Estyl butyrate has flavour like

Choose an answer

Banans

Jasmine

Pineapple

Orange

All of the following are polar amino acids except

Choose an answer

Serine

Glutamate

Arginine

Alanine

How many esters are possible for C2H8O2

Choose an answer

3

2

4

5

The oxidation state of carbon in C2O-²4 is

Choose an answer

+4

-4

+3

+2

Which of the following contains I mole of the stated particles

Choose an answer

Chlorine molecules in 35.5 g of chlorine gas

Electrons in 1 g of hydrogen gas

Hydrogen ions in 1 dm³ of 1 mol dm¯³ aqueous sulfuric acid

Oxygen atoms in 22.4 dm³ of oxygen gas at STP

DDT is a:

Choose an answer

Fungicide

Insecticide

Herbicide

All

If v is the volume of one molecule of a gas under given conditions, then Van der Waals constant b is (N_Ais Avogadro number)

Choose an answer

Plastics are pollution problem because many plastics:

Choose an answer

are made from petroleum

are very inflammable

burn to produce toxic fumes

decompose to produce toxic products

Among the following molecules, which one has coordinate covalent (dative) bond?

Choose an answer

CCI4

CO2

CO

CH4

The arrangement ABC, ABC .... is referred as

Choose an answer

cubic close packing

octahedral close packing

hexagonal close packing

tetrahedral close packing

One of the following metals is the most reactive and form super oxide. Indicate that

Choose an answer

Mg

K

Be

Li

Lind's ,method for liquefaction of gases is based on the principle of:

Choose an answer

Graham's law of diffusion

Joule Thomson effect

Avogadro's hypothesis

Dalton's law of partial pressure

If a strip of Cu metal is placed in a solution of FeSO4

Choose an answer

Cu will be deposited

Cu and Fe both dissolve

Fe is precipitated out

No reaction take place

Photo chemical smog contains _________ as main reactants:

Choose an answer

nitrons oxide and unburnt hydrocarbons

niliric oxide and unburnt hydrocarbons

NO and burnt hydrocarbons

N₂O and burnt hydrocarbons

Crystal lattice with alternate +ve and -ve ions has radius ratio of 0.524.Its coordination number is

Choose an answer

4

3

6

12

The addition compound obtained by reacting acetaldelyde and HCN, when Iydrolyzed gives

Choose an answer

Ethyl alcohol

Methyl cyanide

2-Hydroxy propanoic acid

Ethyl cyanide

The molecular mass of a polymer is obtained by multiplying mass of the monomer unit with the degree of polymerization, The degree of polymerization of PVC is 1000.What is molecular mass?

Choose an answer

65000

63000

62000

60000

The temperature in the incineration process has a range:

Choose an answer

900 to 1000°C

650 to 1100°C

950 to 1300°C

500 to 900°C

Propanone does not undergo

Choose an answer

Oxime formation

Reduction of Fehling solution

Hydrazone formation with hydrazine

Reaction with HCN

Benzene has pi electron

Choose an answer

2

4

6

8

When two ice cubes are pressed together they unite to form one cube. which of the following forces is responsible for holding them together?

Choose an answer

H-bonding

Covalent bonding

van der waal's forces

dipole-dipole interaction

Water may boil at 170C when external pressure is

Choose an answer

760 torr

170 torr

2115 torr

700 torr

The 95.5% mass of Lithoshone is made of 11 elements i,e O₂, Si, Al, Fe, Ca, Na, K, Mg, Ti, H₂and P. Which element is present in trace amount

Choose an answer

iodine

bromine

lead

carbon

Which one of the following is an organic compound?

Choose an answer

Calcium carbide

Calcium cyanide

Carbon disulphide

None of these

Keratomalacia is caused due to the deficiency of vitamin

Choose an answer

A

K

B

D

Example of basic essential amino acids

Choose an answer

Arginine

Histidine

Lysine

All of the above

Which of the following polymers is used for weather resistant paints

Choose an answer

acrylic resins

polyvinyl acetate

polystyrene

PVC

The layer of earth around the earth is called:

Choose an answer

Atmosphere

Hydrosphere

Lithosphere

Biosphere

Oceans, rivers, streams, lakes, polar ice caps, glaciers and group water reservoirs are included in:

Choose an answer

atmosphere

lithosphere

hydrosphere

biosphere

Which element of group V-A and VII-A does not use d-orbital?

Choose an answer

Nitrogen

Sulphur

Arsenic

Chlorine

The hydrocarbon with maximum B.P is

Choose an answer

CH4

C6H14

C4H10

C2H6

As gases can adopt the shape of the container so they have

Choose an answer

no fixed shapes

fixed shapes

different shapes

definite shapes

Density of H₂gas at 0°C is 0.09 under 1 atmospheric pressure. The density of O₂gas under the same conditions of temperature and pressure is

Choose an answer

0.36

1.00

1.44

1.18

Liquids are less common than solids and gases because

Choose an answer

They exist in narrow range of temperature and pressure

They have definite volume

Liquid molecules can slide past each other

Molecules contain three type of motion

Carboxylic acid is given name by replacing "a" of alkane by:

Choose an answer

"oic" acid

"one"

"al"

"ol"

Sugar crystals belong to the system

Choose an answer

cubic

monoclinic

triclinic

orthorhombic

Chose a point which is not included in the components of environment

Choose an answer

Stratosphere

Hydrosphere

Lithosphere

Biosphere

Helical structure of proteins is stabilized by

Choose an answer

Peptide bond

Dipeptide bond

Van der Wall's forces

Hydrogen bonding

CO₂gas is dissolved in water due

Choose an answer

dipole-dipole interactions

higher molecular mass of CO₂

ion dipole attractive forces

hydrogen bonding

What is the cause of water pollution

Choose an answer

Chemical and bacterial constants in live stock

The spilled oil in rivers and ponds

Wide spreads used of pesticides

All of these

Lattice energy is also termed as

Choose an answer

ionization

crystal energy

dissociation

bond energy

Which of the following least resembles an ideal gas?

Choose an answer

ammonia

helium

hydrogen

trichloromethane

In the atosphere, CO₂is about

Choose an answer

0.01%

0.03%

0.05%

0.09%

Carbon-Carbon double bond length in C3H6

Choose an answer

154 pm

134 pm

120 pm

105 pm

If allowed to expand, the gases suddenly

Choose an answer

heat up

move randomly

react

cool down

Which of following is oxidation state of oxygen in peroxides?

Choose an answer

-2

1/2

-1

+2

If the volume term is present in denominator of Kc expression, then which one is correct

Choose an answer

Increase in pressure will shift the reaction backward

Increase in pressure will shift the reaction forward direction

Decrease in volume will shift the reaction forward direction

Reaction will not effected

At constant volume, for a fixed number of moles of a gas the pressure of the gas increases with size of temperature due to

Choose an answer

increase in average molecular speed

increase in number of moles

increase in molecular attraction

decrease in the distance between the molecules

All amino acids are optically active except

Choose an answer

Amino acid

Series

Threonine

Tryltophan

In [Ti (H2O)]3+ which colour is transmitted

Choose an answer

Yellow

Blue and red

Blue and yellow

red and yellow

Alkanes do not show geometrical isomerism due to

Choose an answer

Hyperconjugation

Resonance

Rotation around single hond

Restricted rotation around doubled bond

A graph between P and PV constant temperature and number of moles is parallel to:

Choose an answer

Y-axis

X-axis

Z-axis

Pressure axis

which chlorine compound has bonding that can be described as ionic with some convalent character?

Choose an answer

NaCI

MgCI₂

AICI₃

SiCI₄

The value of oxidation number of chlorine in HCIOs is

Choose an answer

+7

+5

-1

+3

Which property of liquid is measured by polarimeter

Choose an answer

Conductance

Optical activity

Refractiye Indéx

Change in volume

The total pressure exerted by a mixture of gases is the sum of the partial pressure of all the gases present is a statement of

Choose an answer

Charle's Law

Boyle's Law

Dalton's Law

Graham's Law

During esterifcation, the alcobol molecule acts as:

Choose an answer

Oxidizing agent

Electrophile

Reducing agent

Nucleophile

The critical temperature of NH₃ is greater than CO₂ due to its:

Choose an answer

Greater polarity

Stable polarity

Lesser polarity

None of above

Paramagnetic behaviour is caused by the presence of

Choose an answer

Unpaired electrons

Paired electrons

Paired protons

Paired electrons in an atom. molecule or ion

Properties of polymeric material depends upon

Choose an answer

Chemical composition

Structure of molecule

Boiling point

Both A and B

The values of ∆H for the process l(g)+e-1--------->
I-1(g) is:

Choose an answer

>0

<0

0

None

A molecule of polysacharide on hydrolysis produces __________of molecules of monosacharide,

Choose an answer

2 - 10

3

>10

2

The crystal of diamond is

Choose an answer

ionic

molecular

covalent

metallic

Low IE is a symbol of

Choose an answer

high electronegativity

small size

High electron affinity

Metallic character

A fat or oil is characterized for extent of unsaturation by one of the following number. Which one is

Choose an answer

Acid number

Saoilucfucation number

Rancidity number

Iodine number

Which of the following human activities are contaminating surface and ground waters?

Choose an answer

pesticides

septic ranks

petroleum and natural gas production

all of these

Ornithine is

Choose an answer

A basic amino acid

An essential amino acid

Present in protein structure

All of these

The elements of group I-A react violently with water and make the solution

Choose an answer

neutral

amphoteric

acidic

alkaline

Choose the crop for which ammonium nitrate is not used:

Choose an answer

paddy rise

cotton

wheat

sugar cane

Macro-nutrients are required in quantities ranging from

Choose an answer

5 kg - 200 kg

2 kg - 100 kg

1 kg - 50 kg

10 kg - 100 kg

How many balloons of 0.25 dm³capacity at I atmospheric pressure can be filled from a hydrogen gas cylinder of 5 dm³capacity at 10 atmospheric pressure

Choose an answer

50

90

180

200

One mole of a gas refers to

Choose an answer

The number of molecules in one litre of gas

The number of molecules in one gram of gas

The number of molecules contained in 12 grams of ¹²C isotope

The number of molecules in 22.4 liters of a gas at S.T.P.

Which of the following statement about ribose is incorrect

Choose an answer

Poly hydroxyl compound

It is an aldo sugar

Contain six carbon atoms

It exhibit optical activity

Rusting of iron metal Fe occurs when Fe gets converted into Fe2O3 What happen with Fe?

Choose an answer

F'e is neutralized

Fe is sublimed

Fe is reduced

Fe is oxidized

Rise in vapour pressure of water from 30 to 60°C is only 32 torr to 149.4 torr (117.4 torr) but from 60 to 90°C is 149.4 to 527.8 torr (378.4 torr).it is due to

Choose an answer

change in geometry of H₂O molecules at higher temperature

decrease in volume takes place at higher temperature

vapour pressure of liquids increases rapidly closer to their boiling points

boiling starts

Stronger the intermolecular forces

Choose an answer

Lower the Vapour pressure

Greater the Vapour pressure

May be smaller or greater

None

Chemical equilibrium involving reactants and products in more than one phase is called:

Choose an answer

Homogeneous

Heterogeneous

Dynamic

Static

Keratin is

Choose an answer

Protein of tendons

Rich in sulfur

Poor in cysteine

Conjugated protein

Which one of the following will react with bothethand and ethanoic acid at room temperature

Choose an answer

CaCO3

CuO

Na-metal

CH3OH

solubility of carboxylic acids decreases in water with increase in molar mass because

Choose an answer

Bigger molecules are more polar

bigger molecules have bigger non-polar groups

bigger molecules make more hydrogen bonds

bigger molecules can form lesser hydrogen bonds/molecule

Reason for the rancidity of fat is

Choose an answer

Low sponification

High reactivity of fat

Oxidation of fat

All

Ethanoic acid reacts with PCI5, to give ethanoyl chloride. HCI and a third compound What is the third compound

Choose an answer

H3PO3,

POCI3

SO2

COCl2

For the reaction H2(g) +I2 (g) <---------> 2Hl(g). The equilibrium constant changes with

Choose an answer

Total pressure

Catalyst

Concentration of H2 and I2

Temperature

The value of Kc for H2O at 25C° is

Choose an answer

1x10 (-14)mole dm-3

14 mol dm-3

1.86×10(-16) mol dm-3

1.0x10 (-7)moldm-3

What is the reason of ionic solids for not conducting electricity?

Choose an answer

free electrons are less

ions don't have translatory mention.

ions don't have translatory mention

the coordination number of the ion is very high.

The alkaline earth metals are called so because they

Choose an answer

form alkaline solution and are present in earth crust as minerals

form alkaline solution and are found in nature states

are present in earth crust

are present in earth crust as their minerals

The Cl- ion present at the corner of the unit cell is NaCl crystal, contributes

Choose an answer

1/8 th

1/4 th

1/2 th

1

Matter having no definite shape and volume is called:

Choose an answer

gas

liquid

solid

plasma

Which is not the condition for the formation of smog

Choose an answer

there must be sufficient NO gas

there must be sunlight to help photo chemical reactions to take place

air must be blowing swifty

there must be SO₂in the air

The sole produets of combustion analysis are

Choose an answer

CO2 and NH3

H2O and Mg(CIO4)2

CO2 and KOH

CO2 and H2O

Property due to which water acts as a universal solvent is

Choose an answer

Polarity

It's ability to make hydrogen bond

Both A and B

Strong dipole dipole interaction

The pH range of the acid rain is:

Choose an answer

6.5 __ 6

Less than 5

8 __ 7.5

7 __ 6.5

The mono atomic gas molecules are ______ gas molecules

Choose an answer

Halogen

Zero

Noble

Both b and c

Calendar stock is process in paper making in which

Choose an answer

Moisture is removed

Pulp is spreaded over fabric or screen

Paper thickness is removed

Paper is wounded in the form of reel

Which of the following equation is for idea gas:

Choose an answer

PV = dRT

PR = nTP

PM = nRT

PV = nRT

Enthalpy of a reaction can be measured by

Choose an answer

Glass calorimeter

Barometer

Manometer

Thermometer

Abumins and globulins are defined as

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Derived protein

Conjugated protein

Fibrous protein

Simple Protein

Which of the following are thermoplastic materials?

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PVC (poly vinyl chloride)

polystryences

polyethylene

all above

Which substances do nto react immediately with bromine water:

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ethane

benzene

ethene

phenol

Substance that does not show the process of sublimation is

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K2Cr2O7

iodine

naphthalene

NH4CI

Potable water is considered to be:

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safe for human consumption

the ground water

the Surface water

now water is due to the salt of:

Water may boil at 120 °C when external pressure is:

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100 mm of Hg

700 mm of Hg

760 mm of Hg

1489 mm of Hg

All gases liquefly before reaching at

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273°K

373°K

0 K

73°C

The fibre which is made from vinylidine chloride polymer is called

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rayon fibre

azlon fibre

acetate fibre

all of the above

At equilibrium, the concentration of reactants and products are

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Constant

Maximum

Different

Equal

Industrial effluents have toxic synthetic organic compounds as well as heavy metals like

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Pb

Cr

Hg

All of these

What is the morality of a solution containing 15g of urea is 500cm³ of solution?

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1M

0.5M

2M

1.5M

The value of R in term of dm³torr k^-1mol^-1

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62400

62.4

8.313

0.0821

pi-bond can be formed by sideways overlap of

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s-orbital

d-orbital

p-orbital

sp orbital

Which one is best buffer those have

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pH = pKa

pH > pKa

pOH < pKb

pKa =0

Which of the following reactants will be required to form ethene from ethyl chloride

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_{Alcoholic KOH}

Alkaline KMnO4

Aqucous KOH

Aqucous NaOH

Which element is expected to show the greatest tendency to form some covalent compounds?

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aluminium

calcium

magnesium

sodium

lce occupies more space than liquid water

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9%

10%

11%

12%

Choose the difference between natural and synthetic fertilizers:

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shapes

usage

crop application

raw material

Usually the % of moisture in paper is:

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1---3%

6---8%

4---6%

5%

Lithosphere extends upto kilometer of earth crust in depth:

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10 km

100 km

1000 km

10000 km

Enthalpy of neutralization (∆H°n) per mole of H2SO4/ Ba(OH)2 is

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+57.4 kJmol-1

-114.8 kJmol-1

-57.4 kJmol-1

The starting substance for the preparation of iodoform is any of the following, except

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СН3СН(ОН)CН3

CH3CH2ОН

HCH2OH

CH3COCH3

Which pair of the gases doesn't obey Dalton's Law of partial pressures

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H₂and O₂

N₂and O₂

H₂S and H₂

NH₃and HCl

Boiling point of H₂O is higher than that of HF although F is more electronegative than O. It is due to

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stronger dipole dipole forces in H₂O

H₂O is neutral HF is acidic

H₂O is angular, but HF is linear

number of hydrogen bonds more in H₂Othan in HF

Correct statement about Nucleophilic substitution bimolecular is

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Transition state is formed

Inversion take place

It is two step reacticn

Both a &c

Which of the following is not a postulate of the kinetic theory of gases?

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when gas particles collide, their total kinetic energy increases

gases consist of molecules in a constant state of random motion

when gas particles collide their total kinetic energy does not change at all

The gas particles travel in straight lines unit they collide with one another or with the walls of the container

At different temperature, the vapour pressure of water is

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different

same

low

high

Which of the following gas cannot be liquefied by Linde s method

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H₂O vapours

N₂

H₂

CO₂

All gases can be compressed by:

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Keeping constant pressure

Decreasing pressure

Increasing pressure

None of above

In which of the following processes are small organic molecules made into macromolecules

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The cracking of petroleum fractions

The fractional distillation of crude oil

The polymerization of ethene

The hydrolysis of protein

Phenol is colourless, crystalline and solid

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Hygroscopie

Deliquescent

Moistening

Odourless

Which of these are isomrophous to one another NaCl, NH₄Br, K₂CrO₄, K₂SO₄

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NaCl and NH₄Br both cubic

NH₄Br and K₂SO_{4 both tetragonal}

K₂CrO_{4 and}K₂SO₄orthorhombic

NaCl and K₂SO₄both rhobohedral

If absolute temperature of a gas is doubled and pressure is reduced to one half, then the volume of the gas will

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remains unchanged

increases unchanged

reduces to 1/4

increases 4 times

An ideal gas, obeying Kinetic theory of gases cannot be liquified, because

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its critical temperature is above 0°C

its molecules are relatively small in size

It solidifies before becoming a liquid

Forces acting between its molecules are negligible

Which is not an essential amino acid

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Leucine

Methionine

Histidine

Lysine

When two ice cubes are pressed together they unite to form one cube. Which of the following forces is responsibles for holding them together

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Van der Waal's

covalent bonding

hydrogen bonding

dipole-dipole interaction

The process of effusion is best understood by law

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Grahams

Boyle s

Charles s

Avogadro s

The main pollutant of leather in the waste water is due to the salt of:

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Lead

Chromium (VI)

Copper

Chromium (III)

The ratio of diffusion of equal volume of He and SO₂is (molecular mass He = 4, SO₂= 64):

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1:4

16:1

1:16

4:1

The relative rate of diffusion of a gas (molecular weight = 128) as compared to oxygen is

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2 times

1/4

1/8

1/2