Question # 1

A ray of light shows the direction of propagation of light It is line which is.

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Normal to the wave front

Parallax to the wave front

Opposite to the wave front

Equal to the wave front

Radar system is an application of.

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Chemical effect

Electric effect

Magnetic effect

Doppler's effect

Maximum number of components of a vector may be

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Infinite

One

two

three

Han discovered uranium fissionin

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1940

1938

1935

1939

For normal adjustment what is the length of astronomical telescope if focal lengths of astronomical telescope if focal lengths of objective and eye piece are 100 cm 20 cm respectively.

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10 cm

20 cm

5 cm

120 cm

Work is negative when angle between F and d is

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45^o

₀^o

90^o

180^o

Young in 1801 performed experiment for the first time about

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Interference

Diffraction

Polarization

Particle nature of light

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

Systematic erro occurs due to

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Instrument

Zero erro of the instrument

Botah a and b

None of these

The measure of hotness or coldness of a substance is.

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Temperature

Heat

Internal energy

Energy

Velocity of sound is independent of

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Temperature

Density

Pressure

Medium

A diatomic gas molecules has

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Translational energy only

Rotational energy only

Vibrational energy only

All translational, Rotational and vibrational energy

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

1 KWh =

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3.6 x 10³K

3.6 x 10⁶K

3.6 x 10⁹J

3.6 x 10¹²J

In stationary waves the points which always remain at rest are.

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Nodes

Antinodes

Crest

Trough

In sonar we use

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Sound waves

Ultrasound waves

Microwaves

Radio waves

A body rotating with angular velocity of 2 radian/s and linear velocity is also 2 ms-1, then radius of circle is.

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1 m

0.5 m

4 m

2 m

Which is an example of irreversible process.

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Explosion

Evaporation

Slow compression

A chemical explosion

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