Question # 1

In which case application of angular velocity is useful?

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When a body is rotating

When velocity of body is in a straight line

When velocity is in a straight line

None of these

The motion without consideration of its cause is studied in:

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Kinematics

Mechanics

Statics

Modern Physics

In LCR series AC circuit the phase angle between current and voltage is

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Any angle between 0 and ±π/2

π/2

π

Any angle between 0 and π/2

The velocity of a particle at an instant is 10 m/s and after 5 s the velocity of the particle is 20 m/s.The velocity 3s before in m/s is:

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8

4

6

7

According to Stoke's law drag force depends on

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Initial velocity

Final velocity

Terminal velocity

Instantaneous velocity

Planck's constant has the dimensions of:

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Energy

Momentum

Frequency

Angular momentum

The smooth or steady stream-line flow is know as

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Laminar flow

Turbulent flow

Both a and b

None of the above

The volt/metre is the unit of:

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Potential

Work

Force

Electric field intensity

Light appears to travel 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

Absolute temperature can be calculated by

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Mean square velocity

Motion of the molecule

Both (A) and (B)

None of these

To make the frequency double of na oscillator we have to

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Double the mass

Half the mass

Quadruple the mass

Reduce the mass to one-fourth

The velocity of falling raindrops attains limited value because of

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Up thrust of air

Viscous force exerted by air

Surface tension effect

Air currents atmosphere

Which one of the following is a simple harmonic motion?

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Wave moving through a string fixed at both ends

Earth spinning about its own axis

Ball bouncing between two rigid vertical walls

Particle moving in a circle with uniform speed

A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when:

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q = Q/4

q = Q/2

q = Q

None of these

Copper and germanium are cooled to 70K from room temperature, then

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Resistance of copper increases while that of germanium decreases

Resistance of copper decreases while that of germanium increases

Resistance of both decreases

Resistance of both increases

If the period of oscillation of mass (M) suspended from a spring is 2s, then the period of mass 4M will be

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1 s

2 s

3 s

4 s

The direction of induced current is such that it opposes the very cause that has produced it. This is the law of

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Lenz

Faraday

Kirchoff

Fleming

A particle is moving in a uniform magnetic filed, then

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its momentum changes but total energy remains the same

Both momentum and total energy remains the same

Both changes

Total energy change but momentum remains

At a certain instant a stationary transverse wave is found to have maximum kinetic energy. The appearance of string of that instant is:

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Sinusoidal shape with amplitude A/3

Sinusoidal shape with amplitude A/2

Sinusoidal shape with amplitude A

Straight line

When boron is added as an impurity to silicon, the resulting material is.

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n type conductor

n type semiconductor

p-type conductor

p-type semiconductor

What will be the duration of the day and night (in hour) if the diameter of the earth is suddenly reduced to half its original value, the mass remaining constant?

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12

6

3

2

The conductivity of a superconductor is

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Infinite

Very large

Very small

Zero

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