Question # 1

Satellites are the objects that orbit around the

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Moon

Sun

Earth

Star

The efficiency of diesel engine is about

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25% to 30%

35% to 40%

40% to 50%

50% to 60%

A frame of reference stationed at the earth is an

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Inertial frame

None internal frame

Accelerated frame

Laboratory frame

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Unit vector

+ve of a vector

Resultant vector

-ve of a vector

The unit of solar light inversely is

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Watt

kW m-2

Watt m-2

1 m2

Speed of sound in copper is

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38000 ms-1

3600 ms-1

3500 ms-1

3400 ms-1

__ will travel faster than other through an optical fibre.

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Ultraviolet light

Visible light

Infrared light

White light

If the are of a circle equals its radius, then the angle subtended at the center will be

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1 degree

One rotation

One radian

Half rotation

The frictional effect between the different layers of fluid is called

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Terminal velocity

Stock's law

Viscosity

Surface tension

Weight of a 60 kg man in moving elevator with constant acceleration of 1/2 f

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Zero

300 N

600 N

200 N

A man weight 1000 N in a stationary lift. If the lift moves up with an acceleration of 10 ms-2. then its weight becomes.

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1000 N

2000 N

3000 N

0 N

Speed of sound in vacuum is

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280 ms-1

332 ms-1

333 ms-1

Zero ms-1

Sodium chloride in a flame gives

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Green light

White light

Red light

Yellow light

If a body of mass 5 kg is raised vertically through a distance of 1 m, then work done is.

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49 J

4.9 J

490 J

0.49 J

The waves used in radar speed trap are

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Longitudinal

Sound wave

Micro waves

Matter waves

Image formed by a concave lens is

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Real

Virtual

Erect

None of these

The angle between x-axis, y-axis and z-axis is

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45°

60°

75°

90°

The acceleration produced by elastic restoring force is

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Perpendicular to force

Opposite to force

In same direction as force

Zero

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