Question # 1

Angle between ray of light and wave front is

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0 ^o

60 ^o

90 ^o

120 ^o

The experimental value for the velocity of sound in air is

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233 m-sec^-1

333 m-sec^-1

433 m-sec^-1

533 m-sec^-1

Motion of projective is

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One dimensional

Two dimensional

Three dimensional

Four dimensional

If the pressure of a gas is doubled, then speed of sound is.

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Doubled

Become half

Not affected

Increases by four times

The ballistic missiles are used only for

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Long range

Short range

Medium range

Constant range

The dimension of viscosity are

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[M2L-2T2]

[M-1LT-1]

[M-1L-1T]

[ML-1T-1]

The unit of co efficient of viscosity in S.I system

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Kg -1 ms-1

Kg m-1 s-1

kg -1 m-1

Kg ms-1

A constant temperature, if pressure of a given mass of gas is halved, then its volume becomes.

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Halve

Doubled

Four time

Constant

The unit of solar light inversely is

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Watt

kW m-2

Watt m-2

1 m2

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

Close orbiting satellites orbit the earth at a height of about

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400 km

4000 km

400 m

400 cm

Average acceleration is a

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Scalar quantity

Vector quantity

(-) ve quantity

None of these

The ratio of the velocities of wate in a pipe lying horizontally at two ends is 1 : 4 The ratio of diameters of pipe at these two ends is.

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1 : 2

2 : 1

1 : 4

4 : 1

A layer over the central core of the jacke is called.

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Jacket

Plastic

Cladding

Rubber

If the time period of simple pendulum is 2 seconds its frequency will be.

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1 Hz

0.5 Hz

1.5 Hz

2 Hz

This is used for

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Co-efficient of friction

Co-efficient of expansion

Co-efficient of viscosity

Co-efficient of contraction

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

The speed \velocity of sound is greatest in.

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Air

Steel

Ammonia

Water

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