Question # 1

Bodies failing freely under gravity provide good example of motion under

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non-uniform acceleration

uniform acceleration

variable acceleration

increasing acceleration

S.I. unit of planks constant is

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J-s^-1

J.s

J.s^-2

J.s²

Two metal rods A and B have their initial lengths in the ratio 2 : 3 and coefficients of linear expansion in the ratio 4 : 3. When they are heated through same temperature difference the ratio of their linear expansion is

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1 : 2

2 : 3

3 : 4

8 : 9

The force experienced by a single charge carrier moving with velocity 'v' i magnetic field of strength 'B' is given by

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F =q(v/B)

F=q²(v x B)

F=q(v x B)

F= vx B

In order to have a constant current through wire, the potential difference across its end should:

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Be zero

Be maintained constant

Goes on increasing

Go on decreasing

Both (A) and (B)

A current carrying conductor is placed at right angle to the magnetic field. The magnetic force experienced by the conductor is

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minimum

maximum

zero

none of these

CRO deflects the beam of

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proton

a-particle

electron

neutron

Internal energy is the sum of all the forms of

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K.E

P.E

both of them

none of them

A virtual image is formed when object is placed:

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Within focal length of a convex lens

Near the focal point of a concave lens

Both A and B

Away from 2F of a convex lens

Cosine of an angle is positive in:

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2nd quadrant

3rd quadrant

4th quadrant

All of these

The velocity given to a body to go out of the influence of earth's gravity is known as:

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Terminal velocity

Orbital velocity

Escape velocity

None of these

When a person jumps off the ground is

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greater than the weight of the person

smaller than the weight of the person

equal to the weight of the person

zero

The escape velocity for the surface of moon is

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9.8 km/sec

11 km/sec

2.4 km/sec

2.9 km/sec

Moment of inertia of an object does not depend upon

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Mass of object

Mass distribution

Angular velocity

Axis of rotation

Bulk modulus for glass is

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2

31

36

42

A rubber cord 100 cm long is elongated 1 cm by a stretching force of 0.2 N. The cross-sectional area of the cord is 0.04 cm². Find the Young's modulus for that rubber.

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0.5 N cm^-2

0.05 N cm^-2

50 N cm^-2

500 N cm^-2

If a dielectric is placed between the plates of a capacitor its capacitance will

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Increase

Decrease

Becomes double

None of these

Precision or absolute uncertainty and the least count have the relation in which absolute

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uncertainties is double the least count

Equal the least count

Half the least count

None of these

How many wavelengths of Kr⁸⁶ are these in one metre?

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1553164.13

1650763.73

2348123.73

652189.63

If the light travels in a straight line, the central region should appear

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Bright

Dark

No effect

None of these

Which one of the following is an optically active substance?

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Quartz crystal

Calcite crystal

Sugar solution

All of these

Which of the following converts electrical signals into light signals?

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optical fibre

receiver

reflector

transmitter

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