Question # 1

The ballistic missiles are used only for

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Long range

Short range

Medium range

Constant range

The motion of a simple pendulum is the example of

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Vibratory motion

Rotatory motion

Periodic motion

Both a and c

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

When the rocket moves away from the earth, the work against gravity

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Remains constant

Varies directly with distance

Varies inversely with distance

Varies inversely with square of distance

The terminal velocity of a droplet falling down under gravity is directly proportional to the square of

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Its density

Its radius

Its viscosity

Its elasticity

One radian is equal to.

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75.3^o

57.3^o

35.7^o

73.3^o

The device used to study the spectra from different sources of light is

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Telescope

Optical fibre

Spectrometer

Microscope

With increase of temperature, speed of sound.

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Remains constant

Becomes zero

Decreases

Increases

A bullet shot straight up, return to its starting point in 10 sec. Its initial speed was

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9.8 ms-1

24.5 ms-1

49 ms-1

98 ms-1

The magnifying power of an astronomical telescope is 10. If the focal length of objective is 100 cm, then what is the focal length of eye piece.

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10 cm

100 cm

1000 cm

5 cm

The value of of 'g' at the centre of the earth is

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Infinite

2 g

3 g

zero

The direction of angular velocity of along the

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Tangent at that point

Axis of rotation

Radius towards the centre

Radius away from the centre

A typical rocket consumes fuel about

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40000 Kgs-1

30000 Kgs-1

20000 Kg s-1

10000 Kgs-1

Total change in momentum of an isolated system is

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Always (+) ve

Always (-) ve

Has maximum value

Zero

If the tension a stretched string is made four times then the velocity of wave.

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Remains same

Is halved

Becomes twice

Becomes 4 times

The distance between two consecutive wave front is equal to

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One wave length

Two wave length

Half wave length

Three wave length

The internal energy of a piece of lead when beaten by hammer will.

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Increase

Decrease

Remains constant

Increases and then decrease

The mechanism of transports energy of all the waves is

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Different

Same

Complicated

Easy

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