Explore topic-wise MCQs in Physics.

This section includes 12 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 acceleration of the moon towards the earth is approximately 0.0027 m/s2. The moon revolves around the earth once approximately every 24 hours. What would be the acceleration due to gravity of the earth of the moon towards the earth if it were to revolve once every 12 hours?

A. Become half in magnitude
B. double in magnitude
C. Change direction but remain the same in magnitude
D. Remains unchanged
Answer» E.
Discussion
2.

Let the radius of the earth be R. Now, assume that the earth shrunk by 20% but the mass is the same. What would be the new value of acceleration due to gravity at a distance R from the centre of the earth if the value at the same distance in the previous case was g ?

A. g
B. 2g
C. 3g
D. 4g
Answer» B. 2g
Discussion
3.

The net acceleration due to gravity is zero at all points inside a uniform spherical shell.

A. True
B. False
Answer» B. False
Discussion
4.

The time period of a simple pendulum on the surface of the earth is T . What will be the time period of the same pendulum at a height of 2 times the radius of the earth?

A. T
B. 2T
C. 3T
D. 4T
Answer» D. 4T
Discussion
5.

At what height above the surface of the earth, the acceleration due to the gravity of the earth becomes 5% of that of the surface?

A. h = 0.5 R
B. h = 1.5 R
C. h = 2.5 R
D. h = 3.5 R
Answer» E.
Discussion
6.

What is the relationship between height h above the earth s surface and a depth d below the earth s surface when the magnitude of the acceleration due to gravity is equal? (Assume h < < R; where, R = Radius of the earth)

A. h = d
B. h = 2d
C. 2h = d
D. 3h = 2d
Answer» D. 3h = 2d
Discussion
7.

Which of the following is the variation of acceleration due to gravity at a depth d below the earth s surface? Let R be the radius of the earth and M1 the mass of earth. (Assume the density of the earth to be constant)

A. g = (G*M1)/(R d)
B. g = [(G*M1) x density]/d
C. g = (G x M1/R<sup>3</sup>) / (R d)
D. g = (G x M1/R<sup>3</sup>) x (R d)
Answer» E.
Discussion
8.

Which of the following is the variation of acceleration due to gravity at a height h above the earth s surface? Let R be the radius of the earth and M1 the mass of earth. (Assume h < < R)

A. g = (G*M1)/R<sup>2</sup>
B. g = (G*M1)/h<sup>2</sup>
C. g = (G*M1)/(R/h)<sup>2</sup>
D. g = [(G*M1)/R<sup>2</sup>] x [1 (2h)/R)]
Answer» E.
Discussion
9.

Which of the following is the variation of acceleration due to gravity at a height h above the earth s surface? Let R be the radius of the earth and M1 the mass of earth.

A. g = (G*M1)/R<sup>2</sup>
B. g = (G*M1)/h<sup>2</sup>
C. g = (G*M1)/(R + h)<sup>2</sup>
D. g = (G*M1)/(h/R)<sup>2</sup>
Answer» D. g = (G*M1)/(h/R)<sup>2</sup>
Discussion
10.

Assume that the earth is a perfect sphere but of non-uniform interior density. Then, acceleration due to gravity on the surface of the earth _____

A. will be towards the geometric centre
B. will be different at different points on the surface
C. will be equal at all points on the surface and directed towards the geometric centre
D. cannot be zero at any point
Answer» E.
Discussion
11.

Acceleration due to gravity increases as we move away from the surface of the earth radially towards the sky.

A. True
B. False
Answer» C.
Discussion
12.

Acceleration due to gravity increases as we go towards the centre of the earth.

A. True
B. False
Answer» C.
Discussion