Explore topic-wise MCQs in Physics.

This section includes 14 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.

1.

The value ofthe gravitational field in a region is given by g = 2i + 3j. What is the change in gravitational potential energy of a particle of mass 5kg when it is taken from the origin O(0,0) to a point P(10, -5)? (Letters in bold are vectorial representations)

A. 5 J
B. 10 J
C. 25 J
D. 50 J
Answer» D. 50 J
Discussion
2.

The velocity with which an object should be projected from the surface of the earth such that it reaches a maximum height equal to n time the radius of earth R is _____ (M = Mass of the earth)

A. [(n*G*M)/(n+1)R] <sup>1/2</sup>
B. [((n+1)*G*M)/(n+1)R] <sup>2</sup>
C. [(n*G*M)/(n+1)R] [((n+1)*G*M)/nR] <sup>2</sup>
Answer» B. [((n+1)*G*M)/(n+1)R] <sup>2</sup>
Discussion
3.

The gravitational potential energy of a body at a distance r from the centre of the earth is V. Its weight at a distance 2r from the centre of the earth is _____

A. V/r
B. V/4r
C. V/2r
D. 4V/r
Answer» C. V/2r
Discussion
4.

The value of gravitational potential outside a uniform thin spherical shell is the same everywhere.

A. True
B. False
Answer» C.
Discussion
5.

The value of gravitational potential inside a uniform thin spherical shell is the same everywhere.

A. True
B. False
Answer» B. False
Discussion
6.

The value of the gravitational potential at the centre of a ring of radius a and mass M is _____

A. zero
B. -(G*M)/a
C. -(G*M)/a<sup>1/2</sup>
D. infinite
Answer» C. -(G*M)/a<sup>1/2</sup>
Discussion
7.

Gravitational potential energy can be zero but gravitational potential can never be zero.

A. True
B. False
Answer» C.
Discussion
8.

The expression for gravitational potential energy is -(G*M)/r .

A. True
B. False
Answer» C.
Discussion
9.

A 4kg eagle picks up a 75g snake and raises it 2.5 m from the ground to a branch. What is the work done to raise the bird s own centre of mass to the branch? (Assume g = 10 m/s2)

A. 100 J
B. 1.875 J
C. 118.75 J
D. 10 J
Answer» B. 1.875 J
Discussion
10.

A 4kg eagle picks up a 75g snake and raises it 2.5 m from the ground to a branch. What is the work done by the eagle on the snake? (Assume g = 10 m/s2)

A. 100 J
B. 1.875 J
C. 118.75 J
D. 10 J
Answer» C. 118.75 J
Discussion
11.

A dam produces electricity from the gravitational potential energy of the water stored in it. The same dam has 50 cubic km of water stored 50 meters above the ground. What is the work done by gravity relative to the ground? (Assume g = 10 m/s2)

A. 1.5 x 10<sup>16</sup> J
B. 2.5 x 10<sup>16</sup> J
C. 3.5 x 10<sup>16</sup> J
D. 4.5 x 10<sup>16</sup> J
Answer» C. 3.5 x 10<sup>16</sup> J
Discussion
12.

The maximum value of gravitational potential energy is zero.

A. True
B. False
Answer» B. False
Discussion
13.

Conventionally, the magnitude of gravitational potential energy for an object at infinity from the earth is _____ ((M = Mass of the earth; m = Mass of the object at infinity; R = Radius of the earth).

A. -(G*M)/R<sup>2</sup>
B. -(G*M)/R
C. -(G*M*m)/R
D. Zero
Answer» E.
Discussion
14.

The force of gravity is a conservative force.

A. True
B. False
Answer» B. False
Discussion