Question # 1

Close orbiting satellites orbit the earth at a height of about

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400 km

4000 km

400 m

400 cm

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

For angular momentum of system to remain constant, external torque should be.

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Small

Large

Zero

None

International Telecommunication satellite

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4,6,8 and 10 Hz

4,6,11 and 14 GHz

4,6,8 and 12 Hz

4,8,11 and 16 GHz

The product of rotational inertial 'I' and angular velocity ' w' is equal to.

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Torque

Linear momentum

Angular momentum

Force

The value of a time period of allow flying satellite is

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1 year

84 minutes

28 hours

1 day

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

Which one of the following is into directed along the axis of rotation

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Angular acceleration

Angular momentum

Centripetal acceleration

Angular displacement

The artificial satellites are held in orbits by

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Gravitational force

Electric force

Magnetic force

All of these

One radian is equal to.

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75.3^o

57.3^o

35.7^o

73.3^o

Artificial gravity can be created in the space ship by

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Revolving around the earth

Spinning around its own axis

Increasing its velocity

Decreasing it svelocity

Angular velocity determines, How fast or, How slow a body is

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Accelerating

Vibrating

Rotating

Oscillating

The SI unit of angular displacement is.

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Degree

Revolution

Radian

Rotation

The centripetal force is always directed

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Away from the centre along the radius

Along the direction of motion

Opposite to the motion of the body

Towards the centre along the radius

INTELSAT VI satellite operates at microwave frequencies of.

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2,4,6,10 GHz

4,6,11 and 14 MHz

4,6,11 and 14 GHz

2,4,6 AND 14 GHz

The work done by centripetal force is

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(-)ve

(+)ve

Maximum

Zero

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

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Infinite

2 g

3 g

zero

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