Question # 1

The medium in which speed of light is the same in all directions is called:

Choose an answer

Homogeneous

Heterogeneous

Non-homogeneous

Free space

If the acceleration due to gravity is 10 ms^-2 and the units of length and time are changed to kilometer and hour respectively,the numerical value of acceleration is

Choose an answer

360000

72000

36000

129600

The first superconductor was discovered in

Choose an answer

1905

1911

19161

1920

In super conductors, once the current is established it exists

Choose an answer

1 day

30 days

indefinitely

None of these

If the line of action of force passes through the pivot point then the torque produced will be

Choose an answer

maximum

zero

minimum

none of them

A proton is about 1840 times heavier than an electron When it is accelerated by a potential difference of 1 kV,its kinetic energy will be:

Choose an answer

1840 keV

1/1840 keV

1 keV

920 keV

In a compound microscope the intermediate image is

Choose an answer

Virtual erect and magnified

Real,erect and magnified

Virtual,inverted and magnified

Virtual,erect and reduced

The energy stored in a dam is

Choose an answer

Kinetic energy

Electrical energy

Potential energy

None of these

The band above the valence band is

Choose an answer

Completely filled band

Conduction band

Forbidden energy band

None of these

The vector product of two non zero vectors is zero when

Choose an answer

They are parallel to each other

They are perpendicular to each other

They are equal vectors

They are inclined at angle of 60°

The isothermal and adiabatic processes are employed in order

Choose an answer

Two isotherm and then two adiabates

Only isothermal one adibate

Only isothermal process

Only adiabatic process

Total mass when silver coins are added to box as 2.2 kg, 0.01001 Kg and 0.01002 Kg correct to appropriate precision

Choose an answer

2.3 Kg

2.2 Kg

2.43 Kg

2.67 Kg

The ‘emf ’ is always even when no current is drawn through the battery of the cell:

Choose an answer

Zero

Present

Absent

Maximum

To get p-type semiconductor we add impurity from

Choose an answer

3^rd group

4^th group

5^th group

6^th group

Newtons laws are empirical laws, deduced from

Choose an answer

Theories

Experiments

Facts

None of these

In the Young's double slit experiment the separation between the slits is halved and the distance between the slits and the screen is doubled the fringe width is

Choose an answer

Halved

Unchanged

Doubled

Quadrupled

If the tensile force is suddenly removed from a wire then its temperature will

Choose an answer

Decrease

Increase

Becomes zero

Remain constant

In YDS experiment, the condition for constructive interference of two coherent waves is that the path difference should be

Choose an answer

Integral multiple ofλ/2

Integral multiple ofλ

Even integral multiple ofλ/2

Both A and C

The efficiency of full wave rectifier is:

Choose an answer

25.6%

81.2%

81.6%

71.2%

_____________ suggested the basic formula of fractional force F is liquid

Choose an answer

Maxwell

Newton

Plank

Stoke

For the normal setting of a telescope

Choose an answer

Only the object is at infinity

Only the final image is at infinity

Both the object and the final image is at infinity

Neither the object nor the final image has to be at infinity

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

Which characteristics of wave, established the Huygen's wave theory in 1801?

Choose an answer

polarization

interference

propagation

all of them

According to the first condition of equilibrium, vector sum of all the forces action on the body must be

Choose an answer

maximum

minimum

zero

none of them

The curie temperature of iron is called

Choose an answer

250°C

500°C

750°C

1000°C

The test charge is always a unit

Choose an answer

positive charge

negative charge

both

none of these

A disc of moment of inertia is 5 x 10^-3 kgm² is making 20 rad/sec. The torque required to stop it in 10 sec is

Choose an answer

1x10^-3 Nm

1x10^-2Nm

0.1x10^-3 Nm

None of these

Geothermal energy can be obtained from the heating rocks by the

Choose an answer

Igneous rocks

High temperature water

Decay of radioactive element

All of these

Kilowatt-hour is a unit of

Choose an answer

Power

Energy

Electrical Energy

None of these

1 torr is expressed as

Choose an answer

136.5 Nm^-2

13.3 Nm^-2

133.3 Nm^-2

130.5 Nm^-2

Point out angle/angle at which the sin θ and tan θ have the same value

Choose an answer

2^o and 8^o

4^o and 6^o

2^o and 4^o

8^o and 10^o

An instrument called a sphygmomanometer measures

Choose an answer

Density of water

Blood pressure

Milk density

None of these

At the maximum height the V_f is

Choose an answer

_Constant

Zero

Maximum

None of these

The SI units of impulse are

Choose an answer

Nm

Nm²

Nm^-1

Ns

Where the intensity of gravitational field of earth is maximum

Choose an answer

Center of earth

Equator

Poles

Same every where

Power loss taken place when a light signal travels along fibres by

Choose an answer

Multiple reflection

Light absorbed due to impurities in glass

At joint some light is scattered by group of atoms

All of these

What is the bulk modulus of a material?

Choose an answer

strain/volumetric strain

volumetric stress/strain

stress/volumetric strain

volumetric stress/volumetric strain

The typical speed of human running is

Choose an answer

1 ms^-1

2 ms^-1

4 ms^-1

5 ms^-1

The length of the standard metre measured by Michelsion's interferometer comes out to be

Choose an answer

1,553, 163.5 wavelength

1553.5 wavelength

155316.5 wavelength

none of them

Diffraction is concerned with the superposition of

Choose an answer

very large number of secondary wavelets

a few secondary wavelets

two secondary wavelets

no secondary

The shaft of a motor is rotating at constant angular velocity of 3000 rpm. The angle turned per second is

Choose an answer

100 π rad/s

200 π rad/s

300 π rad/s

400 π rad/s

The drag force increase if the speed of the object moving through a fluid

Choose an answer

Increases

Decreases

remains constant

None of these

When small number of atoms from some other suitable element is added to the semi-conductor material, then this process is known as

Choose an answer

impurification

adding

doping

extrinsivity

Dielectric has the charge of the type inside it

Choose an answer

Moving charge

Static charge

Both a & b

None of these

When an image formed by the objective lies at the focus of both the objective and the eye-piece, the telescope is said to be in

Choose an answer

Final adjustment

Normal adjustment

Initial adjustment

None of these

When a bullet is fired by a gun, the gun move backward with a

Choose an answer

velocity less than that of the bullet

velocity equal to that of the bullet

velocity greater to that of the bullet

remains at rest

A cyclist bends while taking a turn to:

Choose an answer

Reduce friction

Generate required centripetal force

Reduce apparent weight

Reduce speed

The effect is to increase the inflating the bag is

Choose an answer

To compress the blood vessels

To increase external pressure

To cut off the flow of blood

All of these

In petrol engine, the first stroke is the

Choose an answer

Power stroke

In take stroke

Exhaust stroke

None of these

Rest mass energy of electron is:

Choose an answer

1.02 MeV

0.51 MeV

931 MeV

200 MeV

Which phenomenon of light conclusively prove that light waves are transverse waves

Choose an answer

Reflection

Diffraction

Interference

Polarization

Steel is more elastic than rubber because

Choose an answer

It is a metal

Its density is higher

Ratio of stress to strain is more

Ratio of stress to strain is less

Absolute potential at infinity is

Choose an answer

Maximum

Minimum

Zero

None of these

The two electric charges originally 8 cm apart are brought closer together, until they are 2 cm apart the force between them is now greater by a factor

Choose an answer

2

4

8

16

In an isothermal process

Choose an answer

Volume remains constant

Pressure remains constant

Temperature remains constant

None of these

Plasma physics is the branch of physics deals with the

Choose an answer

Atoms

Molecules

lons

None of these

When the velocity of a body is decreasing, the acceleration produced is

Choose an answer

Positive acceleration

Negative acceleration

No acceleration produced

None of these

The relation for the diffraction pattern, when it is minimum

Choose an answer

d/2 sin θ = λ

sin θ = λ/2

d sin θ = λ

None of these

When a germanium atom is doped with phosphorous atoms it becomes

Choose an answer

N-type semiconductor

p-type semiconductor

An insulator

None of them

The force which maintains the strict long-range order between atoms of a crystalline solid is the:

Choose an answer

Nuclear force

Cohesive force

Adhesive force

Coulomb force

None of these

The body is in a state equilibrium when it is

Choose an answer

At rest

In motion

In rotation

None of these

When light travels from one medium to another which are separated by a sharp boundary the characteristic which does not change is

Choose an answer

Velocity

Wavelength

Frequency

Amplitude

Diffraction of light occurs, due to the interference between rays coming from the same wavefront of

Choose an answer

The same parts

The different parts

Mixed rays

None of these

In Michelsons interference the movable mirror is moved and a shift of two fringes is observed then the distance moved by the mirror is

Choose an answer

λ/2

λ

2λ

None

By the slope of velocity time, we can determine the

Choose an answer

Acceleration

Constant velocity

Average velocity

Average acceleration

A Celsius degree is larger than a Fahrenheit degree by

Choose an answer

5/9

9/5

9/10

9/8

Stokes law is applicable to

Choose an answer

Very fast moving objects only

Arbitrary shape bodies

Slow moving objects having spherical shapes

All of these

Zero error of the instrument is a type of _____

Choose an answer

Random error

Personal error

Systematic error

Classified error

Stoke s law holds for

Choose an answer

Cubical bodies

Cylindrical bodies

Spherical bodies

Elliptical bodies

The energy required to charge a capacitor of 5 μF by connecting D.C source of 20 kV is

Choose an answer

10 kJ

5 kJ

2 KJ

1 kJ

If one of the rectangular components of a vector is not zero, can its magnitude be zero

Choose an answer

It is zero

It if not zero

It may be negative

None of these

Three quarks make up a:

Choose an answer

Leptons

Mesons

Baryons

Quark

If the two reflected waves reinforce each other then the firm as seen from the parallel beam of monochromic light will look

Choose an answer

Dark

Bright

Sometimes bright and dark

None of these

If a force acts on a body whose action line does not pass through its centre of gravity.then the body will experience

Choose an answer

Angular acceleration

Linear acceleration

No acceleration

None of these

The high blood pressure is known as

Choose an answer

Diastolic

Systolic

High blood pressure

None of these

The wavelength of light observed on the earth, form a moving star is found todecrease by 0.05%. Relative to the earth the star is

Choose an answer

moving away with a velocity of 1.5 x 10⁵m/s

moving away with a velocity of 1.5 x 10⁴m/s

coming closer with a velocity of 1.5 x 10⁵m/s

coming closer with a velocity of 1.5 x 10⁴m/s

Fraunhofer spectrum is a

Choose an answer

Line absorption spectrum

Band absorption spectrum

Line emission spectrum

Band emission spectrum

The SI unit of stress is same as that of

Choose an answer

Momentum

Pressure

Force

Length

The technological uses of superconductors are

Choose an answer

MRI

Magnetic levitation trains

Faster computer chips

All of them

The resolving power of human eye is

Choose an answer

1°

2°

3°

6°

A force of 50 dynes is acted on a body of mass 5 g which is at rest.for and interval of 3 seconds,then impulse is

Choose an answer

0.15 x 10^-3 Ns

0.98 x 10^-3 Ns

1.5 x 10^-3 Ns

2.5 x 10^-3 Ns

The ratio of size of the image to the size of the object is called

Choose an answer

Resolving power

Magnification

Power

None of these

The compound having highest %age of oxygen is:

Choose an answer

CH₃COOH

C₂H₅OH

H₂O

CH3COCH₃

The electrons, which can wander in the solid, are known as:

Choose an answer

Valence electron

Free electron

Loosely bound electrons

None of these

Who confirm the wave theory of light ?

Choose an answer

Newton

Michelson

Newton

Thomos Young

Single mode step index fibre has

Choose an answer

Thick core and large cladding

Thick core and shorter cladding

Thin core and shorter cladding

Thin core and larger cladding

For which position will be maximum blood pressure in a body have the smallest value

Choose an answer

Standing upright

Sitting relaxed

Lying horizontally

Standing on one's head

A convex lens is dipped in a liquid whose refractive index is equal to the material of the lens. Then its focal length will become

Choose an answer

Infinite

Zero

Extremely small

Extremely large

The direction of angular displacement is determined by using

Choose an answer

Heat-to-tail rule

Fleming left hand rule

Right angle rule

None of these

Position vector is a vector which is drawn

Choose an answer

From one point to another

From origin to that point

Always from origin to that point

None of these

Stoke's Law holds for bodies having

Choose an answer

Elliptical shape

Spherical shape

Curved shape

None

A pulse of light in the optical fibres represents the number

Choose an answer

0

1

2

3

If a source of emf is traversed from positive to negative the potential change will be:

Choose an answer

Positive

Negative

Zero

Constant

Length can not be measured by

Choose an answer

Fermi

Debye

Micron

Light year

A bomb of mass 9 kg explodes into two pieces of mass 3 kg and 6 kg.The velocity of mass 3 kg is16 ms^-1,K.E of mass 6 kg is

Choose an answer

96 j

192 j

384 j

768 j

In a cubic crystal, all the sides meet at:

Choose an answer

60°

90°

109°

30°

10°

The low blood pressure is known as

Choose an answer

Diastolic

Systolic

Low blood pressure

None of these

The turning effect of a force is called:

Choose an answer

Acceleration

Torque

Velocity

Momentum

A sun rise or sun set the sun looks reddish because

Choose an answer

The sun is coldest at these times

Of the effects of reflection and refraction

The sun is hottest at these times

Of the scattering of light

The image formed after objective lens of an astronomical telescope is

Choose an answer

Inverted

Diminished

Real

All of these

Bulk modulus for aluminium is

Choose an answer

40

70

75

95

If the distance of circular orbit is 384000 km and 1.01 kms^-1 then find its period of one revolutions in days

Choose an answer

20.2 days

22.4 days

21.2 days

27.5 days

In young's slit experiment on interference the ratio of the intensities of a bright band and a dark band is 6 : 1 the ratio of the amplitudes o the interfering waves is

Choose an answer

16

5/3

4

1/4

The substances in which atoms cooperate with each other in such a way so as to exhibit a strong magnetic effect, are called

Choose an answer

diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

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

Choose an answer

Unit cell

Lattice plane

Crystal

None of these

If the earth suddenly shrinks to half of its present radius the acceleration due to gravity will be

Choose an answer

g/2

4g

g/4

2g

Is Boyle's law is applicable, to the isothermal process

Choose an answer

No

Yes

Some what applicable

None of these

Polaroid glass is used in sun glasses because

Choose an answer

It is fashionable

It has good color

It is cheaper

It reduces the light intensity to half on account of polarization

Which of the following can become a good permanent magnet?

Choose an answer

iron

steel

both of them

none of them

A ball is thrown with a speed of 30 ms^-1in a direction 30° with the ground. What is its vertical height?

Choose an answer

115 m

1.15 m

11.5 m

0.115 m

A listener observes the frequency “f” of stationary source. If it move toward with 3 times of velocity of sound. Then the apparent frequency of the sound will be

Choose an answer

f

3f

f/2

4f

As we go above the surface of earth the value of 'g'

Choose an answer

Increase

Remain Constant

Decrease

Increase slightly

A charge -4 μ C is at origin and +16 μ C is at a distance 3 m on positive x-axis the zero field is located at

Choose an answer

3 m along y=axis

3 m along negative x-axis

3 m along positive x-axis

6 m along negative x-axis

A positively charged particle is moving perpendicular to a uniform magnetic field. The magnetic force makes the particle to move along:

Choose an answer

An elliptical path

A circular path

A parabolic path

None of these

Physical sciences deals with

Choose an answer

Living things

Nonliving things

Both living and non- living

Non of these

The constant K in Coulomb's Law depends upon

Choose an answer

Nature of medium

System of units

Intensity of charge

a & b

A force of 10N is required to move a body with a velocity 10 ms^-1the power developed is

Choose an answer

10 W

50 W

100 W

1000 W

Force of friction between different layers in present in

Choose an answer

Gases

Solids

Liquids

Both A and C

Only those processes are probable to take place for which entropy os the system:

Choose an answer

Increases

Remains constant

Both A and B are correct

None of above

In case of destructive interference of two waves, the amplitude of the resultant wave will be_______either of the waves:

Choose an answer

Greater than

Smaller than

Equal to

none of these

Moment of inertia of thin rod is

Choose an answer

1/2 mL²

1/6 mL²

1/12 mL²

1/15 mL²

The dimensions of work are

Choose an answer

[MLT^-2]

[ML²T^-1]

[ML²T²]

[ML²T^-2]

For a gas obeying Boyle's law, if the pressure is doubled the volume becomes:

Choose an answer

One half

Double

Four times

None of these

Change in entropy is positive when heat is

Choose an answer

Removed

Added

Remains as is it

None of these

For a fixed force, larger is the mass of a body

Choose an answer

Greater acceleration

Small acceleration

Same acceleration

None of these

The cross product of two perpendicular vectors has magnitude

Choose an answer

Maximum value

Minimum value

Zero

None of these

Diamagnetic substances are those in which

Choose an answer

Spin and orbital motions are supported

Spin and orbital motions are opposed

Resultant of spin and orbital motion is zero

None of these

Water is flowing through a pipe under constant pressure. At some place, the pipe becomes narrow, the pressure of water at this place

Choose an answer

Increases

Decreases

Remains same

Depends upon several factors

Suppose the water flows out from a pipe at 3 kgs^-1and its velocity changes from 5 ms^-1 to zero on striking the ball, then force is

Choose an answer

5.3 N

15 N

17.3 N

19.2 N

The unit of thermodynamics scale is

Choose an answer

C°

K

F°

All of these

The wavelength of refractive wave in a denser medium is

Choose an answer

Same as that of the incident wave

Become smaller than the incident

Becomes greater than the incident wave

None of these

An acceleration of fog droplet falling vertically through air is

Choose an answer

Less than g

Greater than g

Equal to g

Zero

Flow rate has SI unit

Choose an answer

m²/s

m/s

m³/s

m³/s²

An inertial frame of reference in which acceleration is

Choose an answer

Very high

Very very low

Zero

None of these

At certain speed, the time taken by light in moving from M to m and back to M is equal to the time taken by

Choose an answer

Face 4 to 1

Fact 6 to 1

Face 3 to 1

Face 2 to 1

A light and a heavy body have equal momentum which one has greater kinetic energy

Choose an answer

Light body

Both has equal K.E

Heavy body

Cannot predict

The magnetic moment of electron is

Choose an answer

9.27 x 10^-24 joule/Tesla

9.27 x 10^-24 Tesla/joule

9.27 x 10^-23joule/Tesla

9.27 x 10^-23Tesla/joule

The symbol for radian is

Choose an answer

rad

Rad

rd

rdn

If the body undergoes unequal displacements in equal intervals of time, the body moves with

Choose an answer

variable velocity

constant velocity

uniform velocity

zero velocity

When the source of light is at very large distance, the shape of wavefront is:

Choose an answer

Spherical

Cylindrical

Plane

None of these

Rudolph clausius gave the quantitative basis for the second law in

Choose an answer

1881

1870

1856

1840

A ______ lens is used in the apparatus to get Newton,s rings

Choose an answer

Plano-concave

Plano-convex

Convexo-concave

Double convex

At what temperature adiabatic change equivalent ot isothermal change

Choose an answer

0°C

0K

Critical temperature

Above critical temperature

Which of the following radiation will be focused farthest from a convex lens

Choose an answer

X - rays

γ - rays

Microwaves

β - rays

Slope of velocity time graph is

Choose an answer

Speed

Work

Power

Acceleration

A finite volume of gas consists of molecules

Choose an answer

Very small

Large

Very large

None of these

The electrons occupying the conduction band are known as

Choose an answer

conduction electrons

free electrons

both of them

none of them

In Michelsion's interferometer, if a dark fringe is seen in the beginning, the next dark fringe will appear by moving the moveable mirror through a distance

Choose an answer

λ/2

λ/4

λ

2λ

Newtons second law of motion is also called

Choose an answer

Law of inertia

Law of acceleration

Law of force

None of these

A wire is stretched to double of its length. Its train is:

Choose an answer

2

1

0

0.5

Which of the given strains can also be written as tan θ

Choose an answer

Compressional strain

Volumetric strain

Shear strain

All of these

Two boats moving parallel in a river

Choose an answer

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

Pressure may be defined as_____per second per unit area:

Choose an answer

Change in force

Change in momentum

Change in energy

Work done

The curie temperature of iron is

Choose an answer

600 C^o

650 C^o

700 C^o

750 C^o

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

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

Choose an answer

10 nm

10^-2mm

1 nm

10^-4mm

The light source used in multimode step index fibre is

Choose an answer

A monochromatic source

Red light

White light

None of these

Laws of motion are not valid in a system which is

Choose an answer

inertial

non-inertial

at rest

moving with uniform velocity

A snooker ball moving with velocity v collides head on with another snooker ball of same mass at rest. If the collision is elastic, the velocity of second snooker ball is

Choose an answer

Zero

Infinity

V

2 V

Which of the following correctly states the base units of weight?

Choose an answer

N

N m s^-2

Kg m s^-1

Kg m s^-2

If the error in the measurement of radius of a sphere is 1% then the error in the measurement of volume will be

Choose an answer

1.1%

3%

5%

8%

Insulators are those materials in which valence band is

Choose an answer

Empty

Partially filled

Full

None of these

By convention, the torques are taken as positive if they are in the

Choose an answer

upward direction

rightward direction

clockwise direction

anticlockwise direction

Bernoulli s equation is the basis of law of conservation of

Choose an answer

Energy

Mass

Charge

Momentum

Fluid friction of a spherical body depend on the

Choose an answer

Shape

Size

Orientation

All of these

The sum of all energy of all molecules atoms in an object is known as

Choose an answer

Temperature

Entropy

Internal energy

None of these

Which of the following cannot be polarized?

Choose an answer

x-rays

light rays

sound waves

ultraviolet rays

In closed end organ pipe, the frequency of first harmonic is 300 Hz. The frequency ofthird overtone is :

Choose an answer

900 Hz

1500 Hz

2100 Hz

600 Hz

Insulators are those materials which valence electrons are bound

Choose an answer

Loosely

Tightly

Very tightly

None of these

The blood flow is laminar at

Choose an answer

Normal blood pressure

Systolic blood pressure

Diastolic blood pressure

High blood presure

If the bright fringe into be observed then we have relation

Choose an answer

Y = mLd/λ

Y = mλL/d

Y = λd/mL

Y = λL/md

An object is placed at a distance 18 cm from a convex lens. The image is formed at a distance of 9 cm the focal length of the lens is

Choose an answer

6 cm

9 cm

10 cm

18 cm

Spectrometer using diffraction grating can measure

Choose an answer

Wavelength of light

Frequency of light

Intensity of light

None of these

High temperature superconductors have temperature

Choose an answer

Above 77 K

Below 77 K

At 77 K

None of these

Substances which undergo plastic deformation until they break are called:

Choose an answer

Ductile

Brittle

Malleable

Soft

Hard

Electromagnetic waves transport:

Choose an answer

Energy only

Momentum

Both A and B are correct

None is correct

Which of the following is not conservative force

Choose an answer

Electric

Gravitational

Elastic spring force

None

Fringe spacing in YDS experiment will be maximum if we use:

Choose an answer

Red light

Green light

Violet light

Blue light

Michelson's interferometer is an instrument used to measure the distance with

Choose an answer

Precision

High precision

Extremely high precision

None of these

If a wire is stretched to double of its length then the strain will be

Choose an answer

1

0.5

2

0

The dimensional formula of angular velocity is:

Choose an answer

M^°L^°T^-1

MLT^-1

M^°L^°T^-1

The light source in the transmitter can be either

Choose an answer

Light emitting diode

Semiconductor laser

Light emitting in an invisible infra red

All of these

In old age, arteries carrying blood in the human body become narrow resulting in an increase in the blood pressure. This follows from

Choose an answer

Pascal's law

Stoke's law

Bernoulli's principle

Archimedes principle

Domains are present only in

Choose an answer

Diamagnetic material

Para magnetic material

Ferromagnetic material

All of these

Potential energy cannot be expressed in

Choose an answer

Joule

Nm

Ns

Watt hour

Blood is an incompressible fluid having density nearly equal to

Choose an answer

Milk

Honey

Water

None of these

The electrons occupying the outermost shell of an atom and the electrons occupying in the energy band are called

Choose an answer

Energy band

Valence band

Forbidden energy band

None of these

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

Choose an answer

9 x 10⁵ V

9 V

8 x 10⁶ V

80 V

Multimode step index fibre has diameter as

Choose an answer

40 μm

50 μm

60 μm

None of these

Pressure exerted by a gas on the walls of its container is due to

Choose an answer

Adhesion between the gas molecules and the container

Cohesion between the gas molecules and the container

Collision between the gas molecules and the container

Surface tension of the gas

The relativistic mechanics in which object move

Choose an answer

Less than C

Greater than C

Equal to C

Approach to C

The centre of gravity of an object is

Choose an answer

The point at which the gravity not acts

The point at which the total torque is minimum

The geometrical centre of the body

The point at which the weight of the object seems to act

Work done per unit charge is

Choose an answer

Electric Flux

Electric potential

Electric intensity

None of these

The SI units of acceleration is

Choose an answer

LT

LT^-1

LT^-2

L²T^-2

The capacity of television channels INTELSAT VI satellite is

Choose an answer

2

3

10

20

How many main frontiers are of fundamental science ?

Choose an answer

One

Two

Three

None of these

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 materials in which there are plenty of free electrons for electrical conduction are known as

Choose an answer

conductors

insulators

semi-conductors

all of them

The terminal velocity of a 2 cm radius ball in liquid is 20 cms^{-1. What would be the terminal velocity if the radius of the ball were halved? Keeping the mass constant}

Choose an answer

80 cms^-1

40 cms^-1

20 cms^-1

5 cms^-1

The speed of sound in air is

Choose an answer

320 ms^-1

323 ms^-1

330 ms^-1

333 ms^-1

1 joule is equal to electrons volt

Choose an answer

1.6 x 10^-19

1.6 x 10¹⁹

6.25 x 10¹⁹

6.25 x 10¹⁸