Question # 1

An object moving through a fluid experiences a retarding force called a

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frictional force

terminal force

opposing force

drag force

When the temperature of source and sink of a heat engine become equal entropy change will be

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Zero

Max

Min

-ve

Solar cell converts sunlight directly into

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potential energy

thermal energy

mechanical energy

electrical energy

In magnet-coil experiment, emf can be produced by:

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Keeping the coil stationary and moving the magnet

Keeping the magnet stationary and moving the coil

Relative motion of the loop and magnet

Any one of above

All above

If two bodies of equal masses moving in the same direction collide elastically, then their velocities.

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Are added

Are subtracted

Do not change

Are exchanged

The SI units of momentum is

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kg m s^-2

kg ms

kg m s²

N-s

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

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different material

all materials

a given material

all of them

The efficiency of petrol engine is usually not more than 25% to 30% because of

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friction

heat losses

both of them

none of them

The number of translation degress of freedom for a diatomic gas is

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2

3

5

6

An induced current can be produced by:

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Constant magnetic field

Changing magnetic field

Varying magnetic feild

Constant electric field

None of these

Polymeric solids have

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low specific gravity

high specific gravity

either of them

none of them

The torque acting on a body is the rotational analogue of

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Mass of the body

Linear kinetic energy of the body

Linear velocity of the body

Force in linear motion

Which of the particles, electron, proton and neutron moving with same speed has longest wave length?

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Electron

Proton

Neutron

All have same

Diffraction is concerned with the superposition of

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very large number of secondary wavelets

a few secondary wavelets

two secondary wavelets

no secondary

The fringe spacing varies directly with

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Distance L

Light of wavelength λ

Phase coherence

All of these

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

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10 kJ

5 kJ

2 KJ

1 kJ

The law of conservation of momentum says that the total angular momentum of the system remains constant if no external

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Force acts on it

Torque acts on it

Frictional force action it

None of these

Electric potential energy per unit charge gives the expression for

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Electric intensity

Electric flux

Electric potenial

Power

When refractive index of core is 1.50 and of 1.48 of cadding then find the angle of entry for an optical fibre is

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11.2^o

14.2^o

15.4^o

13.6^o

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

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signal attenuation

number of signals carried per wire

cost of installation

none of the above

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

When the terminal velocity is reached the acceleration of a body moving through a viscous medium is

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Zero

Positive

Negative

Depends upon other factor

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