NEET Physics Gravitational Field Potential and Potential Energy MCQs Set A

Question: Where will it be profitable to purchase one kilogram sugar?

a) None of these

b) At 40° latitude

c) At poles

d) At 45° latitude

Answer: None of these

Question: Consider Earth to be a homogeneous sphere. Scientist A goes deep down in a mine and scientist B goes high up in a balloon. The gravitational field measured by

a) each decreases at different rates

b) each decreases at the same rate

c) A goes on decreasing and that by B goes on increasin

d) B goes on decreasing and that by A goes on increasing

Answer: each decreases at different rates

Question: In some region, the gravitational field is zero. The gravitational potential in this region.

a) must be constant

b) must be zero

c) must be variable

d) cannot be zero

Answer: must be constant

Question: In a gravitational field, at a point where the gravitational potential is zero

a) the gravitational field is necessarily zero

b) the gravitational field is not necesarily zero

c) any value between one and infinite

d) None of these

Answer: the gravitational field is necessarily zero

Question:  The gravitational field strength due to a solid sphere (mass M, radius R) varies with distance r from centre as

a)

b)

c)

d)

Answer:

Question:

a)

b)

c)

d)

Answer:

Question:  Assuming the radius of the earth as R, the change in gravitational potential energy of a body of mass m, when it is taken from the earth's surface to a height 3R above its surface, is

a)

b)

c) 3 mg R

d) 1 mg R

Answer:

Question:

a)

b)

c)

d)

Answer:

Question:  The potential energy of a rock, having mass m and rotating at a height of 3.2 × 10⁶ m from the earth surface, is

a) – 0.67 mgR_e

b) – 0.33 mgR_e

c) – 6 mgR_e

d) – 0.99 mgR_e

Answer: – 0.67 mgR_e

Question:  There are _______ gravitational lines of force inside a spherically symmetric shell.

a) zero

b) infinitely many

c) varying number depending upon surface area

d) varying number depending upon volume

Answer: zero

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

Question:  Intensity of the gravitational field inside the hollow spherical shell is

a) zero

b) minimum

c) variable

d) maximum

Answer:  zero

Question:

a) zero

b) infinity

c)

d)

Answer:  zero

Question:  Which of the following is always positive?

a) Kinetic energy

b) None of these

c) Total energy of a satellite

d) Potential energy of an object

Answer:  Kinetic energy

Question:

a)

b)

c)

d)

Answer:

Question:  The gravitational potential due to a hollow sphere (mass M, radius R) varies with distance r from centre as

a)

b)

c)

d)

Answer:

Question:  If ‘g’ is the acceleration due to gravity on the earth’s surface, the gain in the potential energy of an object of mass ‘m’ raised from the surface of the earth to a height equal to the radius ‘R' of the earth is

a)

b)

c)

d)

Answer:

Question:  Radius of moon is 1/4 times that of earth and mass is 1/81 times that of earth. The point at which gravitational field due to earth becomes equal and opposite to that of moon, is (Distance between centres of earth and moon is 60R, where R is radius of earth)

a) 54 R from centre of earth

b) 53 R from centre of earth

c) 16 R from surface of moon

d) 5.75 R from centre of moon

Answer: 54 R from centre of earth

Question:  Let V and E denote the gravitational potential and gravitational field at a point. It is possible to have

a) All of the above

b)

c)

d)

Answer:  All of the above

Question:

a) Assertion is correct, reason is incorrect

b) Assertion is incorrect, reason is correct

c) Assertion is correct, reason is correct; reason is not a correct explanation for assertion

d) Assertion is correct, reason is correct; reason is a correct explanation for assertion.

Answer: Assertion is correct, reason is incorrect

Question: A uniform spherical shell gradually shrinks maintaining its shape. The gravitational potential at the centre

a) increases

b) remains constant

c) decreases

d) cannot say

Answer:  increases