Question # 1

Two bodies A and B each of mass 2 kg moving towards right collide with each other elastically,after collision

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A stops and velocity of B increases

Velocity of both decreases

Both moves with the same velocity

Both interchange their velocities

Monochromatic light means waves of:

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Same frequency

Same colour

Same wavelength

All of them

When the first condition for equilibrium is satisfied, if means that there is no

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Linear acceleration

Angular acceleration

Both

None of these

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

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Greater acceleration

Small acceleration

Same acceleration

None of these

Single mode step index fibre has

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Thick core and large cladding

Thick core and shorter cladding

Thin core and shorter cladding

Thin core and larger cladding

The direction of force experienced by a moving in a magnetic field will be:

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Parallel to the field

Opposite to the field

Parallel to its direction of motion

Perpendicular to both the field and the velocity vector

The forbidden energy gap in semiconductors

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Lies just below the valence band

Lies just above the conduction band

Is the same as the valence band

Lies between the valence band and conduction band

The total linear momentum of an isolated system remains

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Constant

Variable

Zero

None of these

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r

r²

r³

None of these

The test charge is always a unit

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positive charge

negative charge

both

none of these

Uniform acceleration is defined as

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Average acceleration

Instantaneous acceleration

Equal change in velocity and time

None of these

If we have two vectors of magnitude 4 and 5 respectively and between them is 60°, what is magnitude of resultant

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4

8

2

3

Strain is dimensionless and has

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Units

No units

S.I. units

None of these

The light waves and radio waves differ in

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Speed

Frequency

Wavelength

Both B and C

In an astronomical telescope the eye piece has the focal length f_e if

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Short

Long

Extremely long

None of these

The number 1678.9 should be written in scientific notation as

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16.789 × 10³

1.6789 × 10³

1678.9 × 10³

None of these

For incident angles equal or greater than the critical angle the glass air boundary will act as a

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Convex mirror

Concave mirror

Mirror

None if them

A student measured the diameter of a wire using a screw gauge with least count 0.001cm.The correct measurement is

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5.3 cm

5.32 cm

5.320 cm

5.3200 cm

Two balls of different masses have same K.E then

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The heavier ball has greater momentum than the lighter ball

Lighter ball has greater momentum than the heavier ball

Both the balls have equal momentum

Both the balls have zero momentum

For obtaining equal and same height mirror should be

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Convex

Concave

Plane

None

Ferromagnetic materials are those in which atoms cooperate with each other

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Weakly

Strongly

Moderately

None of these

In proportional limit (σ) of material, the stress increases with strain

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Linearly

Constant

Abruptly increases

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

The thermometer which is suitable to measure 2000°C is

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Platinum thermometer

Gas thermometer

Vapour pressure thermometer

Pyrometer

Every streamline can

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Not cross each other

Cross each other

Some what cross each other

None of these

The ratio of stress/strain is called as

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Modulus of elasticity

Bulk modulus

Shear modulus

Young's modulus

First law of thermodynamics tells us that heat energy can be converted into work which is

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Equivalent

Greater

Lower

None of these

The motion without consideration of its cause is studied in:

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Kinematics

Mechanics

Statics

Modern Physics

The resolving power of human eye is

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1°

2°

3°

6°

The quantity mr² is known as

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Moment arm

Moment of inertia

Moment of force

None of these

The power output of a full wave rectifier is:

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Equal to H.W.R

Twice of H.W.R

Half of H.W.R

Four times of H.W.R

The approximate efficiency of dry cell battery is

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80%

90%

70%

50%

The torque is zero when the angle between F and r is

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90^o

180^o

270^o

0^o

The index of refraction of diamond is 2.0 velocity of light in diamond in m/s is

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6 x 10⁸

3 x 10⁸

2 x 10⁸

1.5 x 10⁸

Soap bubble looks colored due to

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Dispersion

Reflection

Interference

Any one of these

The gravitational force of earth on a ball of mass one kilogram is 9.8 N. The attraction of ball on the earth is

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9.8 N

Negligible

Slightly less than 9.8 N

More than 9.8 N

The speed of light in vacuum or in air is

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3 x 10¹⁰ m ! s

3 x 10⁹ m ! s

3 x 10⁸ m ! s

3 x 10⁷ m ! s

A fly wheel of moment of inertia 500 kgm² is rotating at a angular speed of 6 rad s^-1. What torque is need to stop the wheel in 3 sec ?

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500 Nm

100 Nm

1500 Nm

2000 Nm

The main reason for the high speed of bullet train is

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Magnetic effect

Reduced friction

Design of train

None of these

Bulk modulus is involved when the deformation is:

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One dimentional

Two dimentional

Three dimentional

Any of these

None of these

The process of doping causes resistivity of semiconductor to

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Increase

Decrease

Same

Become zero

A spinning cricket ball suffers

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An extra height

An extra velocity

An extra curvature

None of these

In blood red cell concentration is ______%.

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25

35

40

50

Einstein inferred that is gravitational acceleration and inertial acceleration are equivalent, gravity must

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Reflect light

Bend light

Turn light

None 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

Where in standing wave, do the vibrations of the medium occur?

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Only at the nodes

Only at the antinodes

At all points between the nodes

At all points between the antinodes

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

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It is zero

It if not zero

It may be negative

None of these

The angle between two vectors -2î + 3ĵ + k̂ and î + 2ĵ-4k̂ is:

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0°

90°

180°

None of the above

If the velocity of a body changes by equal amount in equal intervals of time, the body is said to have

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acceleration

uniform acceleration

instantaneous acceleration

uniform velocity

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

1 cal = __________

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11.184Joule

2.184Joule

3.184Joule

4.184Joule

The Dimension of Force is

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[MLT^-2]

[MLT²]

[ML²T^-2]

None of these

A thin film is a transparent medium whose thickness is comparable with the wavelength of

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light

sound

any one of them

none of them

The rate at which the battery is supplying the electrical energy is the:

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Power output

Electrical power

Power input

Both A and C

In case of streamed lined flow of liquid.the loss of energy is

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Maximum

Minimum

Infinite

Equal to what is in turbulent flow

Moving photons posses:

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Energy

Momentum

Wavelength

All of these

Aerodynamics is a branch of physics deals with the

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Thermodynamics

Hydrodynamics

Dynamics

None of these

Hotness and coldness of an object is represented in terms of:

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Heat

Temperature

Chemicial

None of these

When the velocity of a liquid flowing steadily in a tube increases,its pressure?

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Decreases

Increases

Remains same

Zero

Who gave the corpuscular nature of light

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Einstein

Newton

Maxwell

Thomas young

In full wave rectification by bridge the number of diodes required are

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3

4

2

5

Motion of a paratrooper is an example of

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motion

rest

static equilibrium

dynamic equilibrium

Period of typical radio waves is

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1 × 10^-8 sec

1 × 10^-6 sec

1 × 10^-5 sec

Newtons law of motion defines

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Mass

Force

Acceleration

Speed

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

Finger prints on paper are identified by sprinkling fluorescent powder on it and observing it under

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Sun light

Sodium light

Infrared

UV

A bar of length L, cross-section A and Young's modulus Y, is pulled by a force F from both ends so as to produce an elongation x. Then:

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x∝1/L

x∝A

x∝1/A

x∝Y

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

The uniformly accelerated equations are useful only for

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Angular motion

Curved motion

Linear motion

None of these

The number of electrons emitted depend upon

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Colour of target surface

Shape of surface

Frequency of incident light

Intensity of incident light

The terminal velocity of a drop of water of radius 1 x 10^-3 m moving through air (Given that h = 19 x 10^-6 kgm^-1s^-1)

Choose an answer

114.6 ms^-1

114.6 kms^-1

11.46 ms^-1

1.146 ms^-1

Mathematically the vertical velocity component is

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The low blood pressure is

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70 - 80 torr

75 - 80 torr

78 - 809 torr

79 - 80 torr

The pressure will be low where the speed of the fluid is

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Zero

High

Low

Constant

A normal to the waves front showing direction of propagating of wave is called

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Photon

Particle

Ray

Line

The time taken by the mirror M to rotate through an angle 2π/8 is

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1/8 f

1/16 f

1/4 f

1/2 f

The examples of diamagnetic substances

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Water

Copper

Antimony

All of them

Five equal forces of 10N each are applied at one point and all are lying in one plane.If the angles between them are equal,the resultant force will be:

Choose an answer

Zero

10 N

20 N

10 √2 N

Correction factor can be applied to

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Personal error

Systematic error

Random error

All

Einsteins theory gives us a physical picture of how gravity

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Created

Produced

Works

None of these

Force due to water flow is

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Ma/t

Mv/t

m/t

mt/v

Dielectric has the charge of the type inside it

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Moving charge

Static charge

Both a & b

None of these

The idea of light as wave produced by

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Huygen

Newton

Thomos Young

Michelson

The phenomenon of diffraction also contains the phenomenon of

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Polarization

Interference

Dispersion

None of these

If the water falls from a dam into a turbine wheel 19.6 m below,then the velocity of water at the turbine is

(Take g = 9.8 m/s²)

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9.8 m/s

19.6 m/s

39.2 m/s

98.0 m/s

Which mode can carry more than 14 TV channels or 14000 phone cells?

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single mod step index

multimode step index

multimode graded index

all of them

Glass and high carbon steel are

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Brittle substances

Insulator

Ductile substances

None of these

Inspite vibrations the force which hold the atoms in their ordered form is

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Vander vall force

Cohesive force

Adhesive force

None of these

The fundamental unit of the quantity of matter is

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Kg

Mol

Gm

Meter

The fringe spacing varies directly with

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Distance L

Light of wavelength λ

Phase coherence

All of these

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

a constant force F is applied to keep the particle moving with uniform velocity V.Then the power required is

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1/2 FV²

FV²

FV

F/V

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

The valence energy band can never be

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Filled

Partially filled

Empty

None of these

When a force is applied on a body, several effects are possible. Which of the following effect could not occur?

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the body rotates

the body speeds up

the mass of the body decreases

the body changes its direction

The effect of applying a force on a moving body is to change

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its direction of motion only

its speed of motion only

both the direction and speed of motion

its inertia only

The binding energy per nucleon is:

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Greater for heavy nuclei

Least for heavy nuclei

Greatest for light nuclei

Greatest for medium nuclei

A ball is thrown with a speed of 30 ms^-1_{in a direction of 30}° with the ground. What will be its time of flight?

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3.1 s

1.55 s

0.31 s

15.5 s

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

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Frequency

Phase

Wavelength

All of these

If the instant velocity does not change, the body is moving with a

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Initial velocity

Variable velocity

Uniform velocity

None of these

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

Choose an answer

28,000,0000 ms^-1

29,000,0000 ms^-1

30,000,0000 ms^-1

None of these

The energy due to all the fossil fuels on the Earth is so small that, the energy reaching Earth in just days of sunlight which is

Choose an answer

5 days

10 days

30 dyas

60 days

One electron volt is equal to

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1.6 × 10^-19 C

1.6 × 10^-16 J

1.6 × 10^-19 J

1.6 × 10^-27 J

When the car moves with constant acceleration, the velocity time graph is a

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Straight line

Straight line rises equally

Horizontal straight line

None of these

Which of the following does not have the same units:

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Work

Heat

Kinetic energy

Power

For the monochromatic beam of X-rays, the crystal planes in a lattice act like a

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perfect absorbers

boundary

mirror

none of them

Choose an answer

A

B

C

D

Which one force is only attractive force not repulsive

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Electrostatic force

Gravitational force

Frictional force

All of them

Which of the following cannot be polarized?

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x-rays

light rays

sound waves

ultraviolet rays

Radius of planet A is twice that of planet B and the density of A is one third that of B. the ratio of the acceleration due to gravity at the surface of A to that at the surface of B is

Choose an answer

2 : 3

3 : 2

3 : 4

4 : 3

The frame of reference in which Newton's first law of motion holds is known as

Choose an answer

Inertial frame of reference

Non-inertial frame of reference

Every frame of reference

None of these

A material with high retentively and large corcivety most useful to make

Choose an answer

Electromagnet

Permanent magnet

Choke

None of these

How many wavelengths of Kr⁸⁶ are these in one metre?

Choose an answer

1553164.13

1650763.73

2348123.73

652189.63

Which one of the following is polymer

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Polythene

Polystyrene

Nylon

All

Terminal velocity is

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Uniform and maximum

Uniform

Maximum

Neither uniform nor maximum

In carnot cycle, there are adiabats

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One

Two

Three

Four

For all the irreversible processes the entropy of the system

Choose an answer

Increases

Decreases

Remains constant

None of these

The number 0.0023 should be expressed as

Choose an answer

0.023 × 10^-2

0.23 × 10^-4

2.3 × 10^-3

None of these

If two ping pong balls are suspended near each other and a fast stream of air is produced in the space between the balls, then the balls.

Choose an answer

Come closer

Move farther

Remain in original position

Fall down

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

When two axis are drawn at right to each other are called

Choose an answer

Coordinate axes system

Cartesian system

Rectangular coordinate system

All of these

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

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

Which combination of 7 identical resistors of 3-ohm will give 12/13 ohm:

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3 series, 4 parallel

5 series, 2 parallel

2 series, 5 parallel

4 series, 3 parallel

Smaller the least count of the instrument more is the measurement

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Accurate

Precise

Accurate and precise

None of these

In place of spark plug, the diesel engine requires also

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High speed air

High temperature air

Low temperature air

None of these

What is the unit of the Young's modulus?

Choose an answer

N m^-2

N m^-1

N m

N m²

Blood is an/a

Choose an answer

Ideal fluid

Perfect fluid

Compressible fluid

Incompressible fluid

In Insulators the conduction band is

Choose an answer

Empty

Partially filled

Full

None of these

Nuclear fission experiments show that the neutrons the uranium nuclei into two fragment of about the same size. This process is accompanied by the emission of several:

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Protons and positrons

𝛼 −partilces

neutrons

Protons and 𝛼 −partilces

Solid Angle can be _________ only.

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Practically measure

theoretically measure

Both a and b

Sometimes practically measure and sometimes theoretically measure

An object thrown upward with an initial velocity at certain angle with the horizontal and moving freely under the action of gravity is called

Choose an answer

a rocket

an aeroplane

a projectile

a balloon

The cars usually have cylinders on the crankshaft are

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2

3

4

6

The relative permitivity ∈_r for teflon is

Choose an answer

2.1

2.4

2.9

3.0

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

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

Choose an answer

Solid sphere

Solid cylinder

Both

Equal both

Study of fluid properties in motion is

Choose an answer

Dynamics

Fluid statics

Fluid dynamics

None

A man pushes a wall and fails to displace it. He does

Choose an answer

Negative work

Positive work but not maximum work

No work at all

Maximum positive work

Age of the Earth is

Choose an answer

14 × 10¹⁷ sec

1.4 × 10¹⁹ sec

1.4 × 10¹⁷ sec

1.4 × 10¹⁵ sec

For single slit diffraction the first minimum occurs when

Choose an answer

dsinθ = λ

dsinθ = λ/2

dsinθ = 2λ

dsinθ = mλ

If the resultant of n forces of different magnitudes acting at a point is zero, then the minimum value of n is

Choose an answer

1

2

3

4

In thrill machine rides at amusement parks, there can be an acceleration of

Choose an answer

2 g

3 g

More than 3 g

4 g

The triple point of water is

Choose an answer

100°C

0K

0°C

273.16K

The approximate efficiency of silicon solar cell is

Choose an answer

5 - 10%

9 - 12%

12 - 16%

15 - 18%

Find the angle between two forces of equal magnitude of their resultant is also equal to the magnitude of either of these forces

Choose an answer

60^o

120^o

180^o

360^o

A truck and a car are moving with equal velocity. On applying the brake both will stop after certain distance then

Choose an answer

Truck will cover less distance before rest

Car will cover less distance before rest

Both will cover equal distance

None

A wire is stretched to double of its length.The strain is

Choose an answer

2

1

Zero

0.5

Yttrium barium copper oxide (Yba₂Cu₃O₇) becomes superconductor at

Choose an answer

163 K

-100 °C

both and b

None of these

A 2 kg body and a 3 kg body have equal momentum.If the kinetic energy of 3 kg body is 10 j,the KE of 2 kg body will be

Choose an answer

6.66 j

15 j

22.5 j

45 j

Semiconductor materials have the conductivities generally lies between

Choose an answer

10^-5 to 10^-6 (Ωm)^-1

10^-6 to 10^-4 (Ωm)^-1

10^-7 to 10^-3 (Ωm)^-1

None of these

A wider objective and the use of blue light of short wavelength produces

Choose an answer

Interference

Diffraction

Less diffraction

Polarization

The whole structure obtained by the repetition of unit cells is called:

Choose an answer

Crystal lattice

Amorphous solid

Polymeric solid

Polystrene

None of these

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

Electric potential of earth is takes to be zero because the earth is good

Choose an answer

Semiconductor

Conductor

Insulator

Dielectric

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

Choose an answer

Directly proportional

Inversely proportional

Sometimes inversely

Equal

A piece of copper and another of germinium are cooled from room temperature to 80K. The resistance of

Choose an answer

Each of them increases

Each of them decreases

Copper increases and germanium for

Copper decreases and germanium increases

The SI unit of gravitational constant G is:

Choose an answer

m³kg^-1s^-2

m²kg^-2

Jmkg^-1

None of these

Huygen's principle states that:

Choose an answer

Light travels in straight line

Light has dual nature

Either of these

None of these

The SI units of momentum is

Choose an answer

Kg m s^-2

Kg ms

Kg m s²

Ns

When the lift is moving downward with an acceleration 'a' then

Choose an answer

T - W = ma

T = W - ma

T - ma = W

None of these

Charles Coulomb measured the force between two charges in

Choose an answer

1860 AD

1890 AD

1874 AD

1871 AD

The unit of torr or mm of Hg is opted instead of SI unit of pressure because

Choose an answer

Measurement is easy

Swift calculations

Extensive use in medical equipments

None of these

Stress is defined in terms of:

Choose an answer

Applied force

Deformation

Formation

Any of these

None of these

The product of pressure P and volume V of an ideal gas is

Choose an answer

Constant

Approximately equal to the universal gas constant

Directly proportional to its temperature

Inversely proportional to its temperature

Dimensions of light year are

Choose an answer

[LT^-1]

[ML^-1T]

[ML^-1]

[M⁰L]

The petrol engine works on the basis of

Choose an answer

Kelvin statement

Clausius statement

Carnot cycle

First law of thermodynamics

The dimensional of density are

Choose an answer

[MLT^-3]

[ML^-3]

[M³L]

[ML³]

Torque producing clockwise rotation is taken as

Choose an answer

negative

positive

zero

both negative and positive

By the pull of moon, the land up and down by as much as

Choose an answer

16 cm

25 cm

12 cm

10 cm

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

To get high resolving power for a telescope one should use

Choose an answer

Objective of large aperture

Objective of large focal length

Eye piece of large focal length

Eye piece of small focal length

The frame of reference in which Newton's first law of motion holds is known as

Choose an answer

non-inertial frame is known as

inertial frame of reference

both of them

neither of them

If the values of instantaneous and average velocities are equal, the body is said to be moving with

Choose an answer

uniform acceleration

uniform speed

variables velocity

uniform velocity

Fiber optics also used to transmit light

Choose an answer

Around corners

Into inaccessible place

Formerly unobservable objects

All of these

When m₁= m₂, the velocities of both bodies become

Choose an answer

V'₁= V₂and V₁= -V'₂

V'₂= -V₁and V₁= V'₂

V'₁= V₂and V'₂= V₁

None of these

The Bernoulli's equation is based on the

Choose an answer

Law of conservation of energy

Law of conservation of mass

Law of conservation of momentum

None of these

A line which represents the direction of travel of a wave is known as:

Choose an answer

Spherical wavefront

Locus

Ray

Either B or C

A book is lying on the table What is the angle between the action of the book and the reaction of the table on the book

Choose an answer

0°

180°

30°

90°

We can divide the optical fibres on the basis of the mode by which they propagate light in

Choose an answer

two types

three types

four types

many types

A force applied on a body produces acceleration in

Choose an answer

Its opposite direction

Its own direction

Right angle to the force

None of these

Amorphous solids are more like

Choose an answer

crystalline solids

polymeric solids

glassy solids

any one of them

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

Choose an answer

Precision

High precision

Extremely high precision

None of these

The unit of intensity of electric field is

Choose an answer

newton/coluomb

Joule/culomb

Volt x metre

Newton/meter

The half-life of a radioactive element which has only 1//32 of its original mass left after a lapse of 60 days is:

Choose an answer

12days

10days

22days

36days

The force between two charges in 8 N. Now placed a mica of relativity 4 between two charges as a medium, the force then reduced to

Choose an answer

2 N

4 N

6 N

8 N

The temperature of igneous rocks is about

Choose an answer

100 ^oC

200 ^oC

250 ^oC

270 ^oC

An inertial frame of reference in which acceleration is

Choose an answer

Very high

Very very low

Zero

None of these

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

Choose an answer

diffraction

interference

polarization

reflection

If the red light is replaced by blue light illuminating the object in a microscope the resolving power of the microscope

Choose an answer

Decreases

Increases

Gets halved

Remains unchanged

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

Choose an answer

E = mc

E = mc²

E = mc³

None of these

The motion in a plane is the motion in

Choose an answer

one dimensions

two dimensional

three dimensional

all of them

When a droplet falls through a medium with terminal velocity the acceleration is

Choose an answer

Maximum

Minimum

Constant

Zero

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

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Elastic collision

Inelastic collisiion

Both

None of these

For a moving body. at any instant of time

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If the body is not moving the acceleration is necessarily zero

If the body is slowing.the retardation is negative

If the body is slowing.the distance is negative

If displacement.velocity and acceleration at that instant are known,we can find the displacement at any given time in future.

The motion of a charged nucleus also produces a magnetic field which is

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Weaker than orbital electrons

Stronger than orbital electrons

Equal than orbital electrons

None of these

When the deformation produced in the material becomes permanent, this type of behaviour is called

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proportionality

elasticity

plasticity

none of them

While vibrating the atoms are at their

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Fixed positions

Extreme position

Average positions

None of these

A.H Compton studied the scattering of X-rays by loosely bound electrons from a graph target in:

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1905

1911

19251

1923

In Michelsion's interoferometer, if the moveable mirror is moved through a distance 0.05 mm and 500 finges are observed, then the wavelength of light used is

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1 x 10^-7m

2 x 10^-7m

1.5 x 10^-7m

1 x 10^-8m

The actual efficiency of properly tuned engine is usually not more than

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20% to 35%

25% to 30%

25% to 40%

None of these

If the distance of a surface from light source is doubled,then the luminance will become

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1/4 times

1/2 times

2 times

4 times