Question # 1

In a semi-conductor material, current flows due to

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positive charge

negative charge

both of them

none of them

Lyman series in the spectrum of hydrogen exists in the :

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Infra-red region

Visible region

Ultraviolet region

Both(A) and (B)

None of these

In a three phase a.c generator if the first coil has a phase 0, then the other two coils will have phases

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90° - 120°

20° and 140°

120° and 240°

120° and 140°

The characteristic of a body executing S.H.M is that its acceleration is

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inversely proportional to displacement

directly proportional to displacement

independent of displacement

equal to zero

In compressional wave,the layer of medium having reduced pressure is called:

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Compression

Elasticity

Node

Rarefaction

When a body is vibrating, the displacement from mean position:

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Increases with time

Decreases with time

Changes with time

None of these

If the objects of different masses move with the same velocity, then it is more difficult to stop the

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lighter of the two

massive of the two

any one of them

both of them

Which of the following pairs does not have identical dimensions?

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Torque and energy

Energy and work

Momentum and impulse

Mass and moment of inertia

Structure of the nucleus was explained by

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J.J Thomson

Bohr

Millikan

Rutherford

The electric flux from a closed surface

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Is independent of the shape of the surface

Depends on the charge enclosed by the surface

Both a and b

None of the above

The waves produced in a microwave oven have frequency

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2450 Hz

2450 K Hz

2450 M Hz

2450 G Hz

Newton's second law of motion is also called

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Law of inertia

Law of acceleration

Law of force

None of these

Conditions for interference are that the two sources should be coherent and

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At a far off distance

Close together

Coinciding

None of these

If a light of λ = 588 nm falls on half silvered glass plate in Michelson s interferometer if movable mirror is moved through 0.233 mm the number of fringes will be observed to shift

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795

792

786

None

Ratio of dimensions of power and K.E is

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1 : 1

T : 1

1 : T

M : T

Moment of inertia does not depend upon

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Angular velocity

Mass

Position of axis of rotation

None of these

The unit of surface energy per unit area may be expressed as

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Nm^-2

Nm^-1

Nm

Nm²

After curie temperature iron is

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Ferromgnetic

Diamagnetic

Paramagnetic

None

The ability of a body to return to its original shape when applied force is removed is called

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Stress

Strain

Elasticity

All of them

Torque is a

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Scalar quantity

Vector quantity

Physical quantity

None of these

Ductility is the property of a substance in which a material undergoes the deformation as

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Elastic deformation

Plastic deformation

Shear deformation

None of these

The path difference involved in interference in thin films depends upon

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Thickness and nature of thin films

Angular of incidence of light

Nature of media on both sides of thin film

All of these

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