Question # 1

A satellite revolving around very close to Earth has speed nearly:

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8 kms^-1

5 kms^-1

10 kms^-1

100 kms^-1

Velocity of the body moving in upward direction from the contre of the earth.

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Increases

Decrease

Remain constnat

None of these

The altitude of geostationary orbits in which communication satellites are launched above the surface of the Earth is

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850 km

1000 km

6400 km

42,300 km

Moon is ____ satellite.

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Natural

Communications

Artificial

Geostationary

The velocity of geostationary satellites with respect to Earth is

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Vo

2Vo

Zero

1/2 Vo

The value of gravitational constant is, G is:

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6.67× 10-10 Nm2/Kg2

6.67× 10-11 Nm2/Kg2

6.67× 10-11

None

Earth's gravitational force of attraction vanishes at

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6400 km

Infinity

42300 km

1000 km

S.I unit of G is:

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Nm^-2 kg²

Nm^-2Kg^-2

Nm²kg^-2

Nm²kg^-3

The force exerted by earth on moon is :

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2.01× 1020 N

2.01× 1020 Kg

2.01× 1021 N

2.01× 1022 Kg m/s2

The orbital speed of a low orbit satellite is

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Zero

8 ms-1

800 ms-1

8000 ms-1

The value of 'g' on the surface of moon is:

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1.62 ms^-2

10 ms^-2

20 ms^-2

Zero

The radius R of Earth is

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6.4 x 106 m

6.4 x 108 m

6.4 x 1010 m

6.4 x 1012 m

Value of g on mercury is ___________ ms^-2.

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25.94

3.7

8.87

1.62

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