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Physics 9th Class English Medium Unit 5 Online Test MCQs With Answers

Question # 1

Mass of earth is Me is :

Choose an answer

Me = 6× 1024 kg

6× 1024 kg

7× 1024 kg

6× 1024 Mg

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Question # 2

The orbital velocity of a satellite revolving at height 'h' above the surface of Earth is given by

Choose an answer

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Question # 3

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

Choose an answer

850 km

1000 km

6400 km

42,300 km

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Question # 4

The speed of satellites in GPS is:

Choose an answer

8.73 kms^-1

3.87 ms^-1

32 ms^-1

3.87 kms^-1

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Question # 5

The gravitational force has the ________ relation with the distance between two masses:

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Direct

Inverse

Constant

None

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Question # 6

The earth attracts us due to its __________ mass:

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Little

Zero

Small

Large

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Question # 7

Weight of the body when we increase its height from earth's surface.

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Increase

Decrease

Remain constant

None

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Question # 8

The orbital speed of a low orbit satellite is:

Choose an answer

Zero

8 ms^-1

800 ms^-1

8000 ms^-1

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Question # 9

Newton discovered the cause of falling apple in :

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1886

1905

1665

1600

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Question # 10

Near the earth surface the gravitational field strength is:

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1 N kg^-1

10 N kg^-1

100 N kg^-1

101 N kg^-1

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Question # 11

Orbital velocity v_o =

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√gR

√RG

gR²

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Question # 12

The value of g on moon's surface is 1.6 ms-2. What will be the weight of a 100 kg body on the surface of the moon?

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100 N

160 N

1000 N

1600 N

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Question # 13

Mass of earth is approximately _________

Choose an answer

3.7 x 10²⁴ kg

25.94 kg

6.0 x 10²²kg

6 x 10²⁴kg

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