Question # 1

The speed of sound increases with the increase of in

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Pressure

Volume

Temperature

Density

Which of the following is mechanical wave

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Heat

Light

Sound

None of these

Oil film floating on water exhibits colours due to

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Interference

Diffraction

Polarization

All of these

The efficiency of diesel engine is about

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25 % to 30%

35% to 40%

40% to 50%

50% to 60%

Diffraction is a special type of

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Reflection

Polarization

Interference

Refraction

A ray of light is a line

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Parallel to wave front

Normal to wave front

Anti-parallel to wave

Any one of these

Sound wave can not be

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Reflected

Refracted

Diffracted

Polarized

Which one is non renewable source of energy.

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Hydro electric

Bio mass

Tides

Oil

Hot igneous rocks, usually in molten or partly molten state are found in the depth of

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5 km

10 km

15 km

20 km

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

Second pendulum has a time period

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1 sec

3 sec

2 sec

4 sec

For a rocket , the change in momentum per second of the ejecting gases is equal.

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Acceleration of the rocket

Momentum of rocket

Velocity of rocket

Thrust acting on rocket

The Bragg's equation is given by

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10 N and 20 N are acting on a body of mass 2 kg the minimum acceleration will be.

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10 ms-2

20 ms-2

60 ms-2

5 ms-2

Image formed by a concave lens is

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Real

Virtual

Erect

None of these

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

Interplaner distance can be determined by

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Newton's rings

Bragg's law

Diffraction pattern

Interferometer

Which one of the followign scientistis made some conributions to geometrical optics

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Plato

Archimedes

Euclid

None of these

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