Question

MULTIPLE CHOICE QUESTIONS

1.Newton's law of gravitation is valid *

1 point

on the earth only

on the moon only

in the laboratory only

everywhere

2.An astronaut in the orbit in a spacecraft feels weightlessness *

1 point

due to the absence of gravity inside

due to the fact that spacecraft has no energy

because acceleration in the orbit is equal to acceleration of gravity outside

there is no gravity outside

3. When a body is thrown upward , the force of gravity is*

1 point

in the upward direction

in the downward direction

zero

in the horizontal direction

4. What happens to the acceleration due to gravity with the increase in altitude from the surface of the earth? *

1 point

increases

decreases

first decreases and then increases

remains the same

5. The accelertion due to gravity *

1 point

has the same value everywhere in space

has the same value everywhere on the earth

varies with the latitude on the earth

is greater on the moon due to its smaller diameter

6. The mass of body is measured to be 12 kg on the earth. If it is taken to the moon, its mass will be *

1 point

12 kg

6 kg

2 kg

72 kg

Other:

7. The weight of the body is 120 N on the earth. If it is taken to the moon, its weight will be about *

1 point

120 N

60 N

20 N

60 N

20 N

720 N

8. Gravitational force is a *

1 point

repulsive force

attractive force

neither a nor b

both a and b

9. A coin and a feather are dropped together in a vaccum. Then *

1 point

the coin will reach the ground first

the feather will reach the ground first

both will reach the ground at the same time

the feather will not fall down

10. The value of g is zero *

1 point

at the top of the atmosphere

at 20 km below the surface of the earth

at 20 km above the surface of the earth

at the centre of the earth

Other:


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Answer 1

Answer:

1》everywhere

2》

because acceleration in the orbit is equal to acceleration of gravity outside

3》》

in the downward direction

4》》》decreases

5!!》》》

varies with the latitude on the earth

6》》》

7》》

2kg

8》》》

attractive force

9》》》

both will reach the ground at the same time

10》》

at the centre of the earth

Answer 2

Answer:

Ans 1) a) on the earth only

Ans 10) d) at the center of the earth