Gravitational Force MCQ question and answer with solution

1

The movement of the Moon around the Earth is due to . . . . . . . .

A) Gravitational force B) Centrifugal force C) Concentric force D) Nuclear force

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

2

Which one of the following statements about a satellite orbiting around the earth is correct?

A) Satellite is kept in orbit by remote control from ground station B) Satellite is kept in orbit by retro-rocket and solar energy keeps it moving around the earth C) Satellite requires energy from solar panels and solid fuels for orbiting D) Satellite does not required any energy for orbiting

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

3

What will happen if an object is thrown into space with the speed of 8 km/s?

A) The object will go into space B) It will return to Earth C) It will rotate into the orbit of Earth D) It will burst out

Discuss

Answer & Solution

Answer: Option C

Solution:

The Earth exerts a strong gravitational force that pulls objects toward its center.

When an object is projected with a speed of about 7.9–8 km/s, it attains the first cosmic velocity (orbital velocity).

At this speed, the object does not fall back to Earth because its forward motion continuously balances the pull of gravity.

Instead of returning, the object keeps “falling around” the Earth, thereby moving in a circular or elliptical path.

This speed is less than the escape velocity (11.2 km/s), so the object cannot leave Earth's gravitational field.

Hence, the object will revolve around the Earth and enter into orbit.

4

Astronauts feel . . . . . . . . weight inside the spacecraft.

A) more B) less C) zero D) depends on G force

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

5

A satellite revolves around the earth in a circular orbit. If gravitational pull suddenly disappear, then it

A) falls down with increasing speed B) continues to move with the same speed and along the same path C) moves with the same speed tangential to the original orbit D) comes to rest after moving a certain distance along the original path

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

6

The acceleration due to gravity on the Earth's surface (mass M and radius R) is proportional to . . . . . . . .

A) $$\frac{M}{{{R^2}}}$$ B) $$\frac{M}{R}$$ C) MR D) $$\frac{{{M^2}}}{R}$$

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

7

What is the value of gravitational constant (G)?

A) 6.6734 × 10^-11 m²/kg² B) 6.67408 × 10^-11 m³ Kg^-1 S^-2 C) 6.6734 × 10^-11 Nm²/kg^-2 D) 6.6734 × 10^-11 N - m²/kg²

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

8

What height can he jump on the moon, if a person jumps 1.5 meters hight on the earth?
[The value of g on the moon is $${\frac{1}{6}^{th}}$$]

A) 4.5 m B) 9 m C) 6 m D) 7.5 m

Discuss

Answer & Solution

Answer: Option B

Solution:

On the moon, the gravitational acceleration (g_moon) is 1/6^th that of the Earth.

The height a person can jump is inversely proportional to the gravitational acceleration.

So, if a person can jump 1.5 meters on Earth, then on the Moon, the jump height will be:

Height on Moon = Height on Earth × (g_earth / g_moon)

= 1.5 × 6 = 9 meters

Therefore, a person who jumps 1.5 m high on Earth can jump 9 m high on the Moon.

9

If the mass of the Sun, Earth and the distance between them are M, m and r respectively; The work done by the gravity of the Sun for a revolution around the Sun of the Earth.

A) zero B) $$\frac{{GMm}}{{{r^2}}}$$ C) $$\frac{{GM.m}}{r}.2\pi $$ D) $$\frac{{GMm}}{{{r^2}}}.2\pi $$

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

10

Who proposed the laws of planetary motion?

A) Isaac Newton B) Johannes Kepler C) Galileo D) Roger Bacon

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

Gravitational Force MCQ question and answer with solution | Physics Gk MCQs