Question # 1

The actual efficiency of property turned petrol engine is.

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20% to 30%

30% to 35%

40% to 45%

25% to 30%

Bright fringes are also called as

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Minima

Maxima

Wave front

Ray of light

The unit of rotational K.E. is

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rAD/SEC

Js

J

Kgm2

In case of point source the shape of wave front is.

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Plane

spherical

Circular

Eliptical

In the absence of air resistance the acceleration of a body will be

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Uniform

Variable

Instantaneous

None of these

The product of rotational inertial 'I' and angular velocity ' w' is equal to.

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Torque

Linear momentum

Angular momentum

Force

Half wavelength corresponds to

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0 ^o

90 ^o

180 ^o

360 ^o

Force 12 N and 5 N are add, the resultant con not be

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13 N

6 N

7 N

17 N

Pascal is the unit of

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Pressure

Force

Tension

Weight

The speed of stars and galaxies can be calculated by

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Compton effect

Stefan's law

Doppler's effect

Pascal's law

Temperature of a gas is increased from 27 oC to 127 oC. The ratio of its mean K.E. will be

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3/4

9/16

4/3

10/9

In the absence of external force, the change in momentum is.

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Zero

Constant

Decreasing

Increasing

Multimode step index fiber is useful for.

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Long distance

Sort distance

Very long distance

Infinite distance

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 diatomic gas molecules has

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Translational energy only

Rotational energy only

Vibrational energy only

All translational, Rotational and vibrational energy

Speed of sound in copper is

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38000 ms-1

3600 ms-1

3500 ms-1

3400 ms-1

Frequency range of hearing of cats is.

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20-20000 Hz

10- 10000 Hz

60-20000 Hz

60-70000 Hz

According to Hygen's principle, each point on a wave front acts as a source of.

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Secondary wavelet

New wave front

Sound

Primary wavelet

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