NEET Physics Newtons Universal Law of Gravitation MCQs Set A

a) both small and big bodies

b) only valid for solar system

c) planets only

d) small bodies only

Answer: both small and big bodies

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

a) zero

b) infinite

c)

d)

Answer: zero

Question: The value of G varies with

a) None of these

b) radius of the planet

c) depth below the ground

d) height above the earth's surface

Answer: None of these

Question: 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

Answer:  at the equator

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

a) F

b) None of these

c) 3F

d) 2F

Answer: F

Question:  A mass M is split into two parts m and (M – m), which are then separated by a certain distance. What ratio of m/M maximizes the gravitational force between the two parts?

a)

b)

c)

d)

Answer:

Question:  The distance of the centres of moon and earth is D. 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)

Answer:

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

a)

b)

c)

d) None of these

Answer:

Question:

a)

b)

c)

d)

Answer:

Question:  Consider the following statements and select the correct statement(s).
I. Gravitational force may be attractive or repulsive
II. Gravitational force between two particles is independent of presence of other particles
III. Gravitational force is a short-range force

a) II only

b) II and III

c) I, II and III

d) I only

Answer:  II only

More Questions.....................................

Question:

a)

b)

c)

d)

Answer:

Question:  Two bodies of masses 4 kg and 9 kg are separated by a distance of 60 cm. A 1 kg mass is placed in between these two masses. If the net force on 1 kg is zero, then its distance from 4 kg mass is

a) 24 cm

b) 28 cm

c) 30 cm

d) 26 cm

Answer: 24 cm

Question: A body weighs 72 N on the surface of the earth. What is the gravitational force on it due to earth at a height equal to half the radius of the earth from the surface?

a) 32 N

b) 28 N

c) 16 N

d) 72 N

Answer:  32 N

Question:  If masses of two point objects is doubled and distance between them is tripled, then gravitational force of attraction between them will nearly

a) increase by 225%

b) decrease by 56%

c) decrease by 44%

d) increase by 125%

Answer:  increase by 225%

Question:

a)

b)

c)

d)

Answer:

Question:  If three equal masses m are placed at the three vertices of an equilateral triangle of side 1/m then what force acts on a particle of mass 2m placed at the centroid?

a) Zero

b) –Gm²

c) 2Gm²

d) Gm²

Answer: Zero

Question:  Two identical spheres of gold are in contact with each other. The gravitational attraction between them is

a) directly proportional to the fourth power of the radius

b) inversely proportional to the square of the radius

c) directly proportional to the cube of the radius

d) directly proportional to the square of the radius

Answer:  directly proportional to the fourth power of the radius

Question:  Two particles of equal mass ‘m’ go around a circle of radius R under the action of their mutual gravitational attraction. The speed of each particle with respect to their centre of mass is

a)

b)

c)

d)

Answer:

Question:  Force of gravitational attraction is least

a) None of these

b) at the poles

c) at a point in between equator and any pole

d) Both

Answer: None of these

Question: Two bodies of masses 4 kg and 9 kg are separated by a distance of 60 cm. A 1 kg mass is placed in between these two masses. If the net force on 1 kg is zero, then its distance from 4 kg mass is

a) None of these

b) 28 cm

c) 30 cm

d) 26 cm

Answer: None of these