Question # 1

The speed of sound is greater in solids due to their high.

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Density

Pressure

Temperature

Elasticity

A typical diffraction grating has certain number of lines per centimeter whose range is.

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40 to 50

400 to 5000

400 to 500

4000 to 5000

Speed of sound in aluminum at 20 ^oC is.

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3600 m/s

5100 m/s

5130 m/s

3500 m/s

Boltzman constant 'k' has same unit as.

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Temperature

Energy

Entropy

Pressure

The speed of sound in ari at 0 ^oC is 332 ms-1, Then the speed at 40 ^oC will be

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372 ms-1

356 ms-1

346 ms-1

332 ms-1

The amplitude of a vibrating body at resonance in vacuum is

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Minimum

Maximum

Zero

Infinite

Sound waves can not be

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Reflected

Refracted

Polarized

Diffracted

The temperature scale which is independent of nature of substance is.

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Thermodynamic scale

Centigrade scale

Fahrenheit scale

Regnault scale

If 30 waves per second pass through a medium at a speed 30 ms-1, then the wavelength is.

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30 m

15 m

1 m

28 m

In order to produce beats, the two sound waves should have.

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The same amplitude

Slightly different amplitude

The same frequency

slightly different frequencies.

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 phenomenon of polarization of light reveals that sun light is

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Longitudinal waves

Transverse wave

Electromagnetic waves

Monochromatic wave

The speed of sound in air does not depend upon

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Temperature

Pressure

Density

Medium

The K.E. of bullet of mass 500 gm moving at a speed of 200 ms-1

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250 J

125 J

2500 J

10,000 J

In reversible process the entropy of system.

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Remain constant

Decrease

Increase

Becomes zero

Name the quantity which is a vector.

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Speed

Force

Temperature

Density

Biomas is a potential source of

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Renewable energy

Non renewable energy

Botha a and b

Tidal energy

If a vector of magnitude 10 N along y-axis then its component along x-axis is

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0 N

5 N

8.66 N

10 N

Sodium chloride in a flame gives

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Green light

White light

Red light

Yellow light

In simple harmonic motion the velocity of a particle is maximum at.

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Extreme position

Mean position

In between extreme and mean position

None of them

The process of confining the beam of light to vibrate in one plane is called.

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Interference

Diffraction

Polarization

Total internal refraction

The work done will be maximum when angle between F and d.

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180^o

0^o

90^o

60^o

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