Question # 1

The dimension of gravitational constant G are

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[ML²T^-2]

[M^-1L³T^-2]

[M^-1L²T^-1]

[M^-1L^-2T^-2]

The percentage errors in the measurement of mass and speed are 3% and 4% respectively.The maximum error in the measurement of kinetic energy is:

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11%

10%

8%

9%

Si system is based upon ______ kind of units

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One

Two

Three

Four

Diameter of the atom is of the order of

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10^-10m

10^-12m

10^-15m

10^-9m

Which of the following have the same unit:

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Stress

Strain

Modulus elasticty

Both (A) and (C)

Both (A) and (B)

Bernoulli s equation applicable in the case of

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Streamlined flow of compressible fluids

Streamlined flow of incompressible fluids

Turbulent flow of compressible fluids

Michelesion's interferometer is an instrument usually used to measure

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intensity of light

speed of light

wavelength of light

dispersion of light

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

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40 ^oC

70 ^oC

80 ^oC

90 ^oC

The unit of power of a lens is

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Meter

Watt

Horsepower

Dioptre

A pulsating DC can be converted into constant voltage by using

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Filter

Full wave rectifier

Half wave rectifie

Bridge rectifier

The SI unit of stress is

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Nm²

Nm

dynesm^-1

N

In full wave rectification, the output DC voltage across the load is obtained for.

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The positive half cycle of input AC only

The negative half cycle of input AC

The completes cycle of input AC only

All of the above

Unit of angular displacement is

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Degree

Revolution

Radian

All

Magnetic field inside a solenoid is:

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) Directly proportional to current

Inversely proportional to current

Directly proportional to its length

Inversely proportional to total no of turns

Those solid which breaks soon after crossing the elastic limit are called

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Amorphous

Glassy solid

Crystalline solid

Brittle

The ballistic missiles are useful only for

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long ranges

short ranges

medium ranges

none of them

The cause of mirage observed in desert is

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Refraction

Reflection

Scattering

Total internal reflection

The volt/metre is the unit of:

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Potential

Work

Force

Electric field intensity

Due to Plano convex lens and the plane glass plate the thickness of air film changes from the center to outward

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Increasing gradually

Decreasing gradually

It is constant at the centre

None of these

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

Which of the material is brittle ?

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Steel

Low carbon steel

High carbon steel

None of these

A ballistic missile moves under the result of the superposition of

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one independent motion

two independent motions

one dependent motion

two dependent motions

A certain noninverting amplifier has R1 of 1 kΩ and R2 of 100 kΩ. The closed-loop voltage gain is ………

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100,000

100

1000

101

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

While applying Guass's Law assuming that the field is

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In different directions

Constant in direction

In all directions

None of these

A simple telescope is consists of

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One convex lens

Two convex lenses

Three convex lenses

None of these

Which one of the following has only bulk modulus?

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Diamond

Glass

Tungsten

Water

The particles equal in mass or greater than mass of protons are called:

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Leptons

Mesons

Baryons

Quarks

A lift is moving up with acceleration equal to 1/5 of that due to gravity.The apparent weight of a 60 kg man standing in lift is:

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60 kg wt

72 kg wt

48 kg wt

Zero

A church organ consist of open ended pipes ranging from 4m to 4 mm, if the speed ofsound is considered as 400 m/s then the min and max frequency is:

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400 Hz and 4 kHz

100 Hz and 100 kHz

50 Hz and 50kHz

400 Hz and 400 kHz

The approximate efficiency of incandescent lamp is

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6%

8%

5%

9%

A unit vector is defined as

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Whose magnitude is one

Show the given direction

Opposite direction

a and b

Ratio between total intensity of magnetic field at equator to poles is

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1 : 1

2 : 1

1 : 2

1 : 4

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

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Reflection

Diffraction

Interference

Polarization

A force applied on a body produces acceleration in

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Its opposite direction

Its own direction

Right angle to the force

None of these

A person standing on a rotating platform has his hands lowered.He suddenly outstretches his arms.The angular momentum

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Becomes zero

Increases

Decreases

Remains the same

Physics is an important and basic part of physical sciences which is a

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Mathematical science

Experimental science

Statistical science

None of these

In colour printing, the entire range of colours uses just

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Three colours

Four colours

Five colours

None of these

Curie is the unit of

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decay constant

activity

half-life

average life

A null vector is defined as

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Zero magnitude

Arbitrary direction

Fixed direction

a and b

A collision in which the K.E. is not conserved is called

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Elastic collision

Inelastic collisiion

Both

None of these

Acceleration produced in a body by a force varies

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inversely as the applied force

directly as the mass of the object

directly as the mass of the body

none of them

As the object is brought from a far off point to he focus, the magnification goes on

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Increasing

Decreasing

Do not change

None of these

The equation representing the inter conversion of matter and energy is written as

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E = mc

E = mc²

E = mc³

None of these

A source of a magnetic field is:

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An isolated magnetic

A static electric charge

A moving electric charge

None of these

Phenomenon of interference and diffraction support the:

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Quantum nature of light

Tranverse nature of light

Wave nature of light

Complex nature of light

The original source of Wind energy is

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Tides

Waves

Sun

Moon

Magnetic permeability is maximum for

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Dia-magnetic

Ferromagnetic

Paramagnetic

Non-magnetic

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

Which of the following is a non-conservative force

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Nuclear force

Elastic force

Electrostatic force

Viscous force

A rocket carries its own fuel in the form of

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liquid only

liquid or solid

liquid and solid

liquid or solid and oxygen

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

All of the following statements are correct except

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The total focal length of an astronomical telescope is the sum of the focal lengths of its two lenses

The image formed by the astronomical telescope is always erect because the effect of the combination of the two lenses is divergent

The magnification of an astronomical telescope can be increased by decreasing the focal length of the eyepiece.

For a rocket the change in momentum per second of the ejecting gases is equal to

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Acceleration of rocket

Velocity of rocket

Force acting on rocket

Momentum of rocket

Experiments revealed that the ratio of the stress to the strain is a constant value for

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different material

all material

a given material

all of them

The magnitude of displacement is

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Distance between the two points

Distance in a curved path

Shortest distance between two points

None of these

When the left is moving upwards with an acceleration 'a' then

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T - W = ma

W - T = ma

T = W

None of these

Mirage is a phenomenon due to

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Reflection of light

Refraction of light

Total internal reflection of light

Diffraction of light

The efficiency of a practical heat engine:

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Can be 100%

Can not be 100%

Is always Zero

None of these

Universal gas constant has the unit of

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Newton/°C

Newton/K

J/mol K

Watt/kelvin

A thief stole a box with valuable article of weight W and jumped down a wall of height h.Before he reached ground he experienced a load of

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2W

W

W/2

Zero

Temperature remain constant the volume of given mass of a gas is inversely proportional to the pressure applied on it. it is called

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General gas law

Boyle's law

Charles law

None of these

Resolving power of a telescope depends on:

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The magnification of eyepiece

The focal length of objective lens

Diameter of objective lens

Refractive index of objective lens

Velocity is a

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Scalar quantity

vector quantity

constant quantity

none of them

In projectile motion when a body is projected upward it must have

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Initial velocity

Angleθ<90°

Falling under gravity

All of these

If the line of action of force F passed through the axis of rotation or origin then its torque is

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Maximum

Minimum

Zero

None of these

A typical diffraction grating has lines per centimeter

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10 to 100

100 to 1000

1000 to 5000

400 to 5000

In Newton,s rings apparatus, we also use

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Spectroscope

Telescope

Microscope

Turn table

Ultra-violet rays differ from X-rays in that ultra - violet rays

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Cannot be diffracted

Cannot be polarized

Do not affect a photographic plate

Have a lower frequency

The center of gravity is also called

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Centre of mass

Centre of body

Centre of force

None of these

A ball of mass m moving with uniform speed collides elastically with another stationary ball.The incident ball will lose maximum kinetic energy when mass of the stationary ball is:

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m

2 m

4 m

Infinity

Shear stress addresses to the:

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Volume changes due to the applied stress

Shape changes due to the applied stress

Length changes due to the applied stress

All of the above

What is the unit of the Young's modulus?

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N m^-2

N m^-1

N m

N m²

Close orbiting satellites orbit the Earth at a height of about

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500 km

400 km

300 km

800 km

Two equal, antiparallel and non-collinear forces are called

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Net force

Couple

Torque

None of these

In normal adjustment, the length of the telescope is

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f_e + f_o

f_o - f_e

f_e - f_o

None of these

The projectile is the motion which is

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One dimensional

Two dimensional

Three dimensional

None of these

The critical temperature Tc for Aluminium is

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2.1 K

1.1 K

1.18 K

1.19 K

The shearing strain is measured by

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Angle of rotation

Shearing stress

Angle of shear

Modulus of rigidity

The bending of light when it passes from one medium to another is known as

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Refraction

Interference

Polarization

Diffraction

By calculating the area under the velocity time graph, we can find the

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Acceleration

Velocity

Distance

None of these

Newtons second law of motion is also called

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Law of inertia

Law of acceleration

Law of force

None of these

A spherical wavefront is that which has

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A source

A point source

An extended source

None of these

The re conversion of light signals into electrical signals takes place due to

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Transmitter

Receiver

Generator

None of these

Adiabatic change occurs when the gas expands or compresses when contained in an insulated cylinder

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Slowly

Very slowly

Rapidly

None of these

Vector A lies in the XY-plane. For what orientation will its components have opposite signs ?

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II-quadrant

III-quadrant

IV-quadrant

a and c

The region of plasticity represents

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Proportional limit σ_p

Elastic limit σ_e

UTS (ultimate tensile strength σ_n)

None of these

In projectile motion the vertical acceleration is

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Zero

Maximum

'g'

None of these

Which of the following gives volts as its unit

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Current/resistance

Power x current

Rate of flow of charge

emf of a cell

Blood is an/a

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Ideal fluid

Perfect fluid

Compressible fluid

Incompressible fluid

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

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Positive acceleration

Negative acceleration

No acceleration produced

None of these

A sonar depth finder in a boat uses sound signals to determine the depth of water. Fourseconds after the sound leaves the boat it returns to the boat because of reflection fromthe bottom. Assume the speed of sound in water is 1,460 meters per second. The depth of the water is, in meters, :

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2,200

4,800

4,400

2,920

Fiber optics also used to transmit light

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Around corners

Into inaccessible place

Formerly unobservable objects

All of these

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

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20 j

30 j

40 j

60 j

A gas STP is slowly compressed to one fourth of its original volume, then final pressure is

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4 atmosphere

0.75 atmosphere

8 atmosphere

0.25 atmosphere

The systolic blood pressure comes when

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Vessel collapse

Cutting off the blood flow

None of these

All of these

The work by the body is maximum when it has angle

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30^o

60^o

90^o

0^o

The image formed after objective lens of an astronomical telescope is

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Inverted

Diminished

Real

All of these

In case of YDS experiment, the distance of the mth bright fringe on the screen from center is

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Y = (m + 1)λL/d

Y = mλL/d

Y = (m + 1/2)λL/d

None of these

The arrangement or molecules or atoms in a crystalline solid can be studied by using:

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Chemical methods

Neutrons

X-ray techniques

Copper atoms

Both A and B

Light appears to travels in straight lines since

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It is not absorbed by the atmosphere

It is reflected by the atmosphere

Its wavelength is very small

Its velocity is very large

The food which we eat in three days produces energy equal to energy from ____ liter of petrol

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1

1/3

3

9

Multiplication of a vector is carried out by a

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Number

Direction

Number and direction

None of these

The perpendicular distance between axis of rotation and line of action of force is called

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Moment

Length arm

Moment of length

Moment arm

The band above the valence band is

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Completely filled band

Conduction band

Forbidden energy band

None of these

A count rate 240 per minute reduces to 30 counts per min in 1 hour. The half-life of source is:

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20min

60min

80min

90min

Astrophysics is the branch of physics deals with the

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Physics of oceans

Physics of stars and galaxies

Physics of earth crust

None of these

In 1986 a new class of ceramic material was discovered at temperature as high as

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19 K

78 K

108 K

12 K

In the phenomenon of hysteresis, the magnetism and magnetizing current behaves as

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I lags

1 leads B

I & B becomes equal

None of these

A person holds a bucket of weight 60 N He walks 7 m along the horizontal then climbs up a vertical distance of 5m. The work done by the man is

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300 j

720 j

420 j

None

One second = ______.

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31 x 10^-8years

3.1 x 10⁸years

3.1 x 10^-8years

3.1 x 10^-18years

Two forces are acting together on an object.The magnitude of their resultant is minimum when the angle between the force is:

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0°

60°

120°

180°

The coplanar forces acting on a body keep it in equilibrium so they be

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Parallel

Non=parallel

Concurrent

Non-concurrent

The acceleration of the rocket is

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a = MV/m

a = mM/V

a = mM/2V

a = mV/M

When we jump out of a boat standing in water moves

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Forward

Backward

Sideways

None of these

The concentration of red blood cells in blood is

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~ 30%

~ 40%

~ 45%

~ 50%

Multimode step index fibre has a core of relatively larger diameter such is

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125 μm

175 μm

50 μm

100 μm

Which property of waves proves that light is a transverse wave?

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diffraction

interference

polarization

reflection

Speed of light in vacuum is

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0 ms^-1

3 x 10⁸ms^-1

1.5 x 10⁸ms^-1

None of these

The dimensions of coefficient of viscosity are

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ML^-1T²

ML²T¹

ML^-1T¹

Nono of these

The frequency of an open pipe is f. if one end is closed then its fundamental frequencywill be:

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f/2

3f/4

f

2f

Computer chips are made from

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Conductors

Semiconductors

Insulators

Both A and B

Planck's constant has the dimensions of:

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Energy

Momentum

Frequency

Angular momentun

The typical speed of light, radio-waves, X-rays microwaves is

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28,000,0000 ms^-1

29,000,0000 ms^-1

30,000,0000 ms^-1

None of these

Newton's third law says, that the action and reactions are

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Equal but in the same direction

Equal but in opposite direction

May be unequal but in the same direction

May be unequal but in opposite direction

An electric field can deflect

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Neutrons

X-Rays

γ-Rays

α-Rays

Let a ray of light enters from air into two media of different refractive indices. The speed of light will be ______ to refractive index

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Directly proportional

Inversely proportional

Sometimes inversely

Equal

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

Physics deals with the study of

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Matter and Energy

Outer atmosphere

Matter and Energy and their relationship

None of these

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 subtances which break just after the elastic limit is reached are known as:

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Ductile

Brittle

Malleable

Hard

Soft

The study of atomic structures of crystals by X-rays was started in

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1890

1905

1914

1944

The relative permitivity for vacuum is

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1

2

1.002

1.004

Between layers of liquid in relative motion, viscosity introduces

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Tangential forces

Radial forces

Intermolecular forces

Cohesive forces

If radius of droplet is halved then is terminal velocity in viscous medium

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Doubles

Is halved

Becomes one fourth

Becomes four time

Two masses of 1 g and 4 g are moving with equal kinetic energies.The ratio of the magnitudes of their linear momenta is:

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4 : 1

√2 : 1

1 : 2

1 : 16

Work is defined as the dot product force and displacement which is a

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Scalar quantity

Vector quantity

Constant quantity

None of these

Polaroid glass is used in sun glasses because

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It is fashionable

It has good color

It is cheaper

It reduces the light intensity to half on account of polarization

A rain drop of radius r falls from a certain height h above the ground. The work done by the gravitational force is proportional to

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r

r²

r³

r⁴

The velocity of flow of a liquid through an orifice at the bottom of a tank depends upon the

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Density of liquid

Cross sectional area of orifice

Height of liquid above the orifice

None of there

Michelson interferometer is based upon

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Interference

Diffraction

Polarization

Reflection

The value of Boltzman constant is

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1.28 x 10^-22JK^-1

1.38 x 10^-23JK^-1

1.38 x 10^-28JK^-1

1.35 x 10^-29JK^-1

Brittle is the property of the substance in which a material undergoes

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Elastic deformation

Plastic deformation

Ultimate tensile strength limit

None of these

The diameter of an optical fibre with its protective case may be typically

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7.62 cm

67.62 mm

6.0 mm

90 mm

A body of mass 5 kg is moving in a circle of radius 1 m with an angular velocity of 2 rad/s.The centripetal force is

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10 N

20 N

30 N

40 N

For interference to occur, the light coming from the two slits should

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be monochromatic

come from the same source

have a constant path difference

all of them

By dimensional analysis, we can find

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Correctness of formula

Derivation of formula

Physical nature

All of these

Suppose the water flows out from a pipe at 3 kg s^-1and its velocity changes from 5m s^-1to zero on striking the wall, the force exerted by water on wall will be

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5 N

10 N

15 N

20 N

Spectrometer can measure quite accurately prism

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Deviation of light by a glass prism

Angle of prism

Refractive index of the material of prism

None of these

In which process the change in internal energy of the system is zero:

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Isochoric process

Isobaric process

Adiabatic process

Isothermal process

The perpendicular distance from the axis of rotation to the line of the action of force is called

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Linear distance

Angular distance

Momentum arm

None of these

Conductivity of semiconductor is of order of

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10^-6 to 10⁴ Ω^-1 m^-1

10^-10 to 10^-20 (Ωm)^-1

10⁷ Ωm^-1

None

The numerical values of the ratio of displacement to the distance is

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Always less than one

Always equal to one

Always more than one

Equal to or less than one

Age of the Earth is

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14 × 10¹⁷ sec

1.4 × 10¹⁹ sec

1.4 × 10¹⁷ sec

1.4 × 10¹⁵ sec

As isolated system in which

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No internal force acts

No external force acts

No internal and external force acts

None of these

Which of the following is the smallest unit?

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Millimeter

Angstrom

Fermi

Metre

The time of 30 vibrations of simple pendulum by stop water accurate upto one tenth of a second is 54.6 sec.

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1.82 ± 0.003 sec

2.82 ± 0.03 sec

2.82 ± 0.003 sec

None of these

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

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average acceleration

uniform acceleration

instantaneous acceleration

all of them

Insulators are those materials which valence electrons are bound

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Loosely

Tightly

Very tightly

None of these

The ratio of applied stress to volumetric strain is called

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shear modulus

Young's modulus

Bulk modulus

None of these

Arsenic antimony or phosphorus are impurities of

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p-type

n-type

May be p-type or n-type

None of these

M.K.S. unit of pressure

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Atmosphere

Dynes per sq.cm

Meter

Pascal

If d is the displacement of the body in time t, the its average velocity will be

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v_av= _{d x t}

v_av= t/d

v_av= d/t

v_{av = d/t}

Inertial mass and gravitational mass are

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opposite

identical

identical when there is no friction

all of them

Huygen's principle states that:

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Light travels in straight line

Light has dual nature

Either of these

None of these

Wavelength of X-rays falling at glace angle 30° on crystal with atomic spacing 2 x 10^-9m for the first order diffraction is

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4 x 10^-6m

2 x 10^-10m

0.2 x 10^-10m

20 x 10^-10m

Shear modulus for brass is

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36

39

51

65

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

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2

4

8

16

Light year is the unit of

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Speed

Mass

Distnace

Time

A single step index fibre can carry more than

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14 TV channels

14,000 phone calls

16 TV channels

a and b

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

The path described by a projectile is called its

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orbit

trajectory

range

distance

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

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5.3 N

15 N

17.3 N

19.2 N

The typical speed of Moon around the Earth is

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1000 ms^-1

2000 ms^-1

3000 ms^-1

4000 ms^-1

A thin layer of oil on the surface of water looks colored due to:

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Diffraction of light

Reflection of light

Dispersion of light

Interference effect of light

A couple produces

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Purely linear motion

Purely rotational motion

Linear and rotational motion

No motion

Every streamline can

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Not cross each other

Cross each other

Some what cross each other

None of these

When the pressure of a fixed mass of a gas is decreased under isothermal condition there is

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Fall of temperature

Increase of density

No change in internal energy

A decrease in the value of PV

The temperature of igneous rocks is about

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100 ^oC

200 ^oC

250 ^oC

270 ^oC

The light produced by a laser is all the following except

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Incoherent

Monochromatic

In the form of a narrow beam

Electromagnetic

Which is constant for a satellite in orbit?

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Velocity

K.E.

Angular Momentum

Potential Energy

Electric potential of earth is taken to be because earth is a good

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insulator

Conductor

Semi-conductor

Dielectric

Is the Gravitational force is conservative ?

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Yes

No

A little

None of these

2 d sin θ = nλ can be used to determine the

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Inter planar spacing

Wavelength

Incident angle

All of these

A body moves a distance of 10 m along a straight line under the action of a force of 5 Newton.If the work done is 25 joules. the angle which the force takes with the direction of motion of the body is:

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0°

30°

60°

90°

The relative permitivity ∈_r for Paraffined paper is

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1.9

2.0

2.2

2.9

What makes the hair shaving brush cling together when taken out of water

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Viscosity

Attraction between the hair

Gravity

Surface tension

The typical speed of Earth around the sun is

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29700 ms^-1

29600 ms^-1

29500 ms^-1

29400 ms^-1

Motion of rocket is based upon

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Newtons third law of motion

Law of conservation of momentum

Newtons law of gravitation

Both (a) and (b)

One ferms is equivalent to

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10^-14 meter

10¹⁴ meter

10^-15 meter

10¹⁴ meter

The property due to which the size or shape of a lattice is not important is called

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Cleavage

Anisotropy

Homogenity

None of these

Super conductor offers no resistance to

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Thermal agitation

Electric current

Induced current

None of these

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

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100 π rad/s

200 π rad/s

300 π rad/s

400 π rad/s

The angular momentum of a system of particles is not conserved

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When net external force is acting upon the system

When a net external torque is acting upon the system

When a net external impulse is acting upon the system

None of these

The curie temperature for iron is

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750°C

570°C

750°k

57°K

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

At what point/points in its path does a projectile have it minimum speed

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At the point of projection

At maximum height

All the point where it strikes the ground

None of these

The dielectric constant K of an insulator cannot be.

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3

8

6

∞

SI Unit of power is

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Joule

Pound

Watt

Dyne

A body will be in rotational equilibrium if

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Which of the following theory completely explain the three types of materials?

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Bohr model of electron distribution

Rutherford atomic model

Pauli's exclusion principle

energy band theory