Explore topic-wise MCQs in Physics Questions and Answers.

This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Physics Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.

1.

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] 1/2
B. [((n+1)*G*M)/(n+1)R] 2
C. [(n*G*M)/(n+1)R]d) [((n+1)*G*M)/nR] 2
Answer» B. [((n+1)*G*M)/(n+1)R] 2
Discussion
2.

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
3.

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)/a1/2
D. infinite
Answer» C. -(G*M)/a1/2
Discussion
4.

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

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

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
6.

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
7.

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 1016 J
B. 2.5 x 1016 J
C. 3.5 x 1016 J
D. 4.5 x 1016 J
Answer» C. 3.5 x 1016 J
Discussion