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Question (1)

QN0035394

Newton's universal law of gravitation applies to

(A)
small bodies only
(B)
planets only
(C)
both small and big bodies
(D)
only valid for solar system

Correct Answer: C

Explanation:

It is applicable to both small and big bodies.

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Question (2)

QN0035395

For a particle inside a uniform spherical shell, the gravitational force on the particle is

(A)
infinite
(B)
zero
(C)
(D)

Correct Answer: B

Explanation:

Various regions of spherical shell attract the point mass inside it in various directions. These forces cancel each other completely. Therefore the gravitational force on the particle is zero.

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Question (3)

QN0035396

Force of gravitational attraction is least

(A)
at the equator
(B)
at the poles
(C)
at a point in between equator and any pole
(D)
None of these

Correct Answer: A

Explanation:

The gravitational force of attraction on a body of mass is given by

The radius of earth is maximum at equator, therefore, gravitational force of attraction is least at equator.

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Question (4)

QN0035397

Two spheres of masses and are situated in air and the gravitational force between them is . The space around the masses is now filled with a liquid of specific gravity 3 . The gravitational force will now be

(A)
(B)
(C)
(D)

Correct Answer: D

Explanation:

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Question (5)

QN0035398

A mass is split into two parts and , which are then separated by a certain distance. What ratio of maximizes the gravitational force between the two parts?

(A)
(B)
(C)
(D)

Correct Answer: B

Explanation:

For maximum value of , and so .

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Question (6)

QN0035399

The distance of the centres of moon and earth is . The mass of earth is 81 times the mass of the moon. At what distance from the centre of the earth, the gravitaional force will be zero?

(A)
(B)
(C)
(D)

Correct Answer: D

Explanation:

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Question (7)

QN0035400

Six stars of equal mass are moving about centre of mass of the system such that they are always on the vertices of a regular hexagon of side length . Their common time period will be

(A)
(B)
(C)
(D)
None of these

Correct Answer: B

Explanation:

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Question (8)

QN0035401

Two stars of mass and are parts of a binary system. The radii of their orbits are and respectively, measured from the C.M. of the system. The magnitude of gravitational force exerts on is

(A)
(B)
(C)
(D)

Correct Answer: A

Explanation:

.

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Question (9)

QN0035402

In the figure, the direction of gravitational force on due to is along

(A)
(B)
(C)
(D)

Correct Answer: C

Explanation:

As attracts towards itself, force is along .

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Question (10)

QN0035403

Two bodies of masses and are separated by a distance of . A mass is placed in between these two masses. If net force on is zero, then its distance from mass is

(A)
(B)
(C)
(D)

Correct Answer: D

Explanation:

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Question (1)

Newton's universal law of gravitation applies to

Explanation:

Link:

Question (2)

For a particle inside a uniform spherical shell, the gravitational force on the particle is

Explanation:

Link:

Question (3)

Force of gravitational attraction is least

Explanation:

Link:

Question (4)

Two spheres of masses and are situated in air and the gravitational force between them is . The space around the masses is now filled with a liquid of specific gravity 3 . The gravitational force will now be

Explanation:

Link:

Question (5)

A mass is split into two parts and , which are then separated by a certain distance. What ratio of maximizes the gravitational force between the two parts?

Explanation:

Link:

Question (6)

The distance of the centres of moon and earth is . The mass of earth is 81 times the mass of the moon. At what distance from the centre of the earth, the gravitaional force will be zero?

Explanation:

Link:

Question (7)

Six stars of equal mass are moving about centre of mass of the system such that they are always on the vertices of a regular hexagon of side length . Their common time period will be

Explanation:

Link:

Question (8)

Two stars of mass and are parts of a binary system. The radii of their orbits are and respectively, measured from the C.M. of the system. The magnitude of gravitational force exerts on is

Explanation:

Link:

Question (9)

In the figure, the direction of gravitational force on due to is along

Explanation:

Link:

Question (10)

Two bodies of masses and are separated by a distance of . A mass is placed in between these two masses. If net force on is zero, then its distance from mass is

Explanation:

Link:

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