Question # 1

Two tuning forks of frequencies 240 Hz and 243 Hz are sounded together, the number of beats per second is.

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Zero

2

3

4

Which one of the following can not be polarized.

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Ultra violet rays

Radio waves

T.V. Waves

Sound waves

A convex lens acts as diverging lens if the object is placed at

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F

2F

Between F and 2 F

Within the F

The motion of a simple pendulum is the example of

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Vibratory motion

Rotatory motion

Periodic motion

Both a and c

Which of the following is not directed along the fixed axis of rotation.

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Angular displacement

Angular momentum

Centripetal acceleration

Angular acceleration

The SI Unit of amount of substance is

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Mole

Joule

Volt

Ohm

Critical angle is that incident angle in denser medium for which angle of refraction is.

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0 ^o

45 ^o

90 ^o

120 ^o

The direction of angular velocity is determined.

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Left hands rule

Head to tail rule

Right hand rule

General rule

Rate of change of velocity is called

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Speed

Acceleration

Displacement

Torque

The period of the earth is equal to

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one lunar day

One astronomical

One Solar day

A set of frequencies which are multiples of the fundamental frequency are called.

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Doppler effect

Nodal frequencies

Beat frequencies

Hamonics

A body of mass 2 kg moving with velocity of 4 ms-1 has K.E. equal to.

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16 J

8 J

32 J

2 J

Errors due to incorrect design of a device are called

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Random Error

Systematic Error

Physical Error

None of these

A body has P.E. = mgh, when it is at height 'h' from the ground. At the point at the distance 'x' below from the top its P.E. with

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mgh

mgx

mg(x-h)

None of these

The SI unit of product of pressure and volume is.

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_Watt

Joule

Pascal

Newton

Force acting on the piston to move outward is.

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Compressive stoke

Power stoke

All stoke

Exhaust stoke

A spring has a spring constant k. If it is cut in two equal parts, the spring constant of each part will be

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K

2 K

K/2

4K

A phenomenon by which energy is dissipated from the oscillating system is called.

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Forced oscillation

Free oscillation

Damping

Simple harmonic motion

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