Gravitation Test

Question 1
1 / -0

What does not change in the field of central force?

A
Potential energy

B
Kinetic energy

C
Linear momentum

D
Angular momentum

Question 2
1 / -0

The radius of the orbit of a planet is two times that of earth. The time period of planet is

A
4.2 years

B
2.8 years

C
5.6 years

D
8.4 years

Question 3
1 / -0

The period of revolution of planet A around the sun is 8 times that of B. The distance of A from the sun is how many times greater than that of B from the sun

A
2

B
3

C
4

D
5

Question 4
1 / -0

If satellite is shifted towards the earth. The time period of satellite will be

A
Increase

B
Decrease

C
Unchanged

D
Nothing can be said

Question 5
1 / -0

If gravitational constant is decreasing with the time, what will remain unchanged in case of satellite orbiting around earth

A
Time period

B
Orbiting radius

C
Tangential velocity

D
Angular velocity

Question 6
1 / -0

Assertion: The comet does not obey Kepler's law of planetary motion.

Reason: The comet does not have elliptical orbit.

(A) If both Assertion and Reason are true and the Reason is correct explanation of assertion.

(B) If both Assertion and Reason are true, but reason is not correct explanation of the Assertion.

(C) If Assertion is true, but the Reason is false.

(D) If Assertion is false, but the Reason is true.

A
A

B
B

C
C

D
D

Question 7
1 / -0

Escape velocity of a body of 1 kg mass on a planet is 100m/sec. Gravitational potential energy of the body at the planet is

A
-500 J

B
-1000 J

C
-2400 J

D
-5000 J

Question 8
1 / -0

A rocket is launched with velocity 10 km/s. If the radius of earth is R, then maximum height attained by it will be

A
2R

B
3R

C
4R

D
5R

Question 9
1 / -0

If the earth suddenly shrinks (without changing mass) to half of its present radius, the acceleration due to gravity will be

A
\(\frac{g}{2}\)

B
\(4g\)

C
\(\frac{g}{4}\)

D
\(2g\)

Question 10
1 / -0

Gravitational mass is proportional to gravitational

A
Field

B
Force

C
Intensity

D
All of these

Question 11
1 / -0

Who among the following gave first the experimental value of "G”

A
Cavendish

B
Copernicus

C
Brook Taylor

D
None of these

Question 12
1 / -0

An iron ball and a wooden ball of the same radius are released from a height ‘h’ in vacuum. The time taken by both of them to reach the ground is

A
Unequal

B
Exactly equal

C
Roughly equal

D
Zero

Question 13
1 / -0

As we go from the equator to the poles, the value of g is

A
Remains the same

B
Decreases

C
Increases

D
Decrease unto a latitude 45°

Question 14
1 / -0

An object weighs 72N on Earth. Its weight at a height of \(\frac{R}{2}\) from the earth is

A
32 N

B
56 N

C
72 N

D
0

Question 15
1 / -0

Assertion: Gravitational force between two particles is negligibly small compared to the electrical force.

Reason: The electrical force is experienced by charged particles only.

(A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(B) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(C) If assertion is true but reason is false.

(D) If the assertion and reason both are false.

A
A

B
B

C
C

D
D

Question 16
1 / -0

The earth revolves about the sun in an elliptical orbit with mean radius \( 9.3 \times 10^7\) m in a period of 1 year. Assuming that there are no outside influences

A
The earth's kinetic energy remains constant

B
The earth's angular momentum remains constant

C
The earth's potential energy remains constant

D
All are correct

Question 17
1 / -0

As observed from the earth, the sun appears to move in an approximate circular orbit. For the motion of another planet like mercury as observed from the earth, this would

A
Be similarly true

B
Not be true because the force between the earth and mercury is not inverse square law

C
Not be true because the major gravitational force on mercury is due to the sun

D
Not be true because mercury is influenced by forces other than gravitational forces

Question 18
1 / -0

If the moon ceased to remain the earth's satellite, its orbital velocity has to increase by a factor of

A
\(2\)

B
\(\sqrt 2\)

C
\(\frac{1}{\sqrt 2}\)

D
\(\sqrt 3\)

Question 19
1 / -0

The mass of the earth is 81 times that of the moon and the radius of the earth is 3.5 times that of the moon. The ratio of the acceleration due to gravity at the surface of the moon to that at the surface of the earth is

A
0.15

B
0.04

C
1

D
6

Question 20
1 / -0

If there were a smaller gravitational effect, which of the following forces do you think would alter in some respect?

A
Viscous forces

B
As it depends on the weight of the body

C
Electrostatic force

D
None of the above

Submit Test

Gravitation Tes...

Question 1

Potential energy

Kinetic energy

Linear momentum

Angular momentum

Question 2

4.2 years

2.8 years

5.6 years

8.4 years

Question 3

2

3

4

5

Question 4

Increase

Decrease

Unchanged

Nothing can be said

Question 5

Time period

Orbiting radius

Tangential velocity

Angular velocity

Question 6

A

B

C

D

Question 7

-500 J

-1000 J

-2400 J

-5000 J

Question 8

2R

3R

4R

5R

Question 9

\(\frac{g}{2}\)

\(4g\)

\(\frac{g}{4}\)

\(2g\)

Question 10

Field

Force

Intensity

All of these

Question 11

Cavendish

Copernicus

Brook Taylor

None of these

Question 12

Unequal

Exactly equal

Roughly equal

Zero

Question 13

Remains the same

Decreases

Increases

Decrease unto a latitude 45°

Question 14

32 N

56 N

72 N

0

Question 15

A

B

C

D

Question 16

The earth's kinetic energy remains constant

The earth's angular momentum remains constant

The earth's potential energy remains constant