Gravitation Test

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Gravitation Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

How does the force of gravitation between two objects change when the distance between them is reduced to half?

A
reduced to half

B
becomes one third

C
becomes thrice

D
becomes four time

Solution

Gravitational force is inversely proportional to square of the distance between them. Hence when distance is reduced to half the gravitational force will increase four times.
Question 2
1 / -0

Which of the following statement are incorrect-
A Value of acceleration due to gravity is same at all places
B Mass is constant at all places
C Weight is constant at all places
D Weight of an object can be zero.

A
(a) and (c) are correct

B
(b) and (c) are correct

C
(a) and (c) are correct

D
(a), (b) and (c) are correct

Solution

Acceleration due to gravity does not remain same everywhere and so the weight also because 'g' is variable with the radius and mass of the body.
Question 3
1 / -0

What happens to the force between two objects if the masses of both objects are doubled?

A
force will get half

B
force will get 1/4

C
force will get twice

D
force will get four times.

Solution

As the gravitational force between two bodies is directly proportional to the product of their masses. If mass of the both of objects are doubled. The value of force becomes four times.
Question 4
1 / -0

The distance between two particles is decreased. The gravitational force between them

A
increases

B
decreases

C
remains the same

D
becomes zero

Solution

Gravitational force between two bodies is inversely proportional to square of the distance between them. So, when distance between two bodies is decreased the gravitational force between them will increase.
Question 5
1 / -0

If Ge is the value of universal gravitational constant at the Earth and Gm is the value of universal gravitational constant on the moon then

A
Ge < Gm

B
Ge = Gm

C
Ge = 6Gm

D
Ge>Gm

Solution

As Universal gravitational constant remain same throughout the universe. The value of Gm and Ge will be same. So, Ge= Gm.
Question 6
1 / -0

Which of the following phenomena is due to gravitational force?

A
Rain fall and snowfall

B
Tides in ocean

C
Movement of satellites around planets.

D
All of these

Solution

Gravitational force acts between two bodies to attract the bodies towards each other. Tides in ocean, movement of satellite and rain fall all are due to gravitational force.
Question 7
1 / -0

Statement A: Polar radius is 6357km and equatorial radius is 6378km,
Statement B: At a given place the weight of an object is equal to mass of the object
Which of the two statement is true?

A
statement A

B
statement B

C
statement A and B both

D
neither statement A not statement B

Solution

The radius of the earth at the poles is 6357 km, the radius at the equator is 6378 km.
The force by which earth attracts an object towards it is called the weight of the object, which is the product of mass (m) of the object and acceleration due to gravity (g). Mass is the measurement of inertia. So, At a given place the weight of an object is not equal to mass of the object.
So, Statement A is true and B is false.
Question 8
1 / -0

Gravitation force is a

A
weakest force

B
strongest force

C
short range force

D
non-central force

Solution

Gravitational force is a weak force. This force exists between each and every object but cannot be felt until the mass of the bodies are not extremely high like planets.
Question 9
1 / -0

Statement A: The Earth attract the moon with a force greater than the force with which the moon attracts the Earth.
Statement B: The mass and weight of a body becomes 0 at the centre of the Earth.
Which of the two statement is true?

A
statement A

B
statement B

C
both the statements A and B

D
neither statement A nor B.

Solution

Earth and moon attracts each other with equal gravitational force. The mass of a body never becomes 0. Hence both statements are incorrect.

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Gravitation Test - 6

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Gravitation Test - 6

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Question 1

reduced to half

becomes one third

becomes thrice

becomes four time

Solution

Question 2

(a) and (c) are correct

(b) and (c) are correct

(a) and (c) are correct

(a), (b) and (c) are correct

Solution

Question 3

force will get half

force will get 1/4

force will get twice

force will get four times.

Solution

Question 4

increases

decreases

remains the same

becomes zero

Solution

Question 5

Ge < Gm

Ge = Gm

Ge = 6Gm

Ge>Gm

Solution

Question 6

Rain fall and snowfall

Tides in ocean

Movement of satellites around planets.

All of these

Solution

Question 7

statement A

statement B

statement A and B both

neither statement A not statement B

Solution

Question 8

weakest force

strongest force

short range force

non-central force

Solution

Question 9

statement A

statement B

both the statements A and B

neither statement A nor B.

Solution

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