Free Gravitation MCQs with Answers
265 Gravitation MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Newton’s law of universal gravitation relates the force between masses to their masses and separation, while gravitational field strength explains weight and orbital motion. The topic covers satellite velocity and period, escape ideas, weightlessness in free fall, and artificial gravity, which differs from ordinary gravitational attraction.
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265 questions · page 3 of 14
41. The formula used by Cavendish to find out the value of G with the help of "Cavendish apparatus" was:
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The formula used by Cavendish to find out the value of G with the help of "Cavendish apparatus" was G = Cθr2/Mml.
Correct answer: Option C42. When the downward acceleration of the elevator increased, the weight of the objects inside it will:
- A. Decrease
- B. Increase
- C. Remain the same
- D. None of these
Explanation: The weight of an object is the force exerted on it due to gravity. On Earth, this force is usually equal to the gravitational force, and…
Correct answer: Decrease- A. Weight
- B. Mass
- C. Density
- D. Gravitational acceleration
Explanation: The force with which the Earth attracts a body is referred to as its weight. Weight is a force acting on an object due to gravity.
Correct answer: Weight- A. 8.9 ms-2
- B. 8.8 ms-2
- C. 9.8 ms-2
- D. 1.98 ms-2
Explanation: The value of gravitational acceleration at the surface of the earth is 9.8 ms -2
Correct answer: 9.8 ms-245. The value of g at a depth of x metres from the surface of the earth is calculated from the formula:
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: The value of g at a depth of x metres form the surface of the earth is calculated from the formula g = GMe/(Re - x)2
Correct answer: Option D- A. Increases
- B. Decreases
- C. Remains constant
- D. Has no value
Explanation: As you go below the surface of the Earth, the value of gravitational acceleration (g) generally decreases.
Correct answer: Decreases- A. Zero
- B. Infinity
- C. 9.8 ms-2
- D. None of the above
Explanation: At the center of the Earth, the value of gravitational acceleration (g) becomes zero.
Correct answer: Zero48. An astronaut, in a satellite, orbiting the earth, experience a state of weightlessness because of:
- A. The satellite orbits the earth at a very large speed
- B. The satellite orbits the earth with a centripetal acceleration greater than 'g'
- C. The satellite orbits the earth with a centripetal acceleration less than 'g'
- D. The satellite orbits the earth with a centripetal acceleration equal to 'g'
Explanation: When a satellite is in orbit around the Earth and moving at the right speed, it is in free fall towards the Earth, and its acceleration…
Correct answer: The satellite orbits the earth with a centripetal acceleration equal to 'g'- A. Additive inverse of each other
- B. Multiplicative inverse of each other
- C. Equal
- D. Not equal
Explanation: Practically, the inertial mass and the gravitational mass are observed to be equal.
Correct answer: Equal- A. Equal to its actual weight
- B. Less than the actual weight
- C. More than the actual weight
- D. Zero
Explanation: When a lift is moving upward with a uniform velocity, the apparent weight of a body inside the lift is equal to its actual weight.
Correct answer: Equal to its actual weight- A. Less than its actual weight
- B. More than its actual weight
- C. Varying with velocity
- D. The same as its actual weight
Explanation: When the lift is moving upward with a uniform acceleration, the apparent weight of the body inside it will be more than its actual weight.
Correct answer: More than its actual weight- A. g + a
- B. g - a
- C. g - 2a
- D. g + 2a
Explanation: When the lift moves upward with a uniform acceleration a, the apparent weight experienced by a person inside the lift is given by the…
Correct answer: g + a- A. Less than its actual weight
- B. More than its actual weight
- C. Varying with its velocity
- D. The same as its actual weight
Explanation: If the lift is moving downward with a uniform acceleration, there is an additional force acting on the body in the upward direction…
Correct answer: Less than its actual weight- A. g + a
- B. g - a
- C. g - 2a
- D. g + 2a
Explanation: The apparent weight is the force experienced by an object inside the lift, and it's the force with which the object presses against the…
Correct answer: g - a- A. Remain the same
- B. Become half
- C. Become zero
- D. Become double
Explanation: In free fall, the lift and everything inside it are accelerating downward at the same rate as gravity.
Correct answer: Become zero- A. One fourth
- B. One sixth
- C. One eighth
- D. One third
Explanation: The explanation is given below: The weight of a body on the moon is approximately one-sixth (1/6) of its weight on Earth.
Correct answer: One sixth- A. g
- B. 2g
- C. 3g
- D. -g
Explanation: The sensation of weightlessness experienced by astronauts in a satellite is due to the fact that both the satellite and the astronauts are…
Correct answer: g- A. Centripetal force
- B. Centrifugal force
- C. Magnetic force
- D. None of the above
Explanation: Correct Answer: B Artificial gravity in a spaceship can be created using the principle of centripetal force.
Correct answer: Centrifugal force- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Correct Option: B The numerical explanation is given as follows:
Correct answer: Option B- A. By increasing the orbital speed of the satellite
- B. By decreasing the orbital speed of satellite
- C. By keeping the orbital speed of the satellite constant equal to that of the earth's around sun
- D. By causing the satellite to spin about its own axis
Explanation: Artificial gravity in a spaceship can be created using the principle of centripetal force.
Correct answer: By causing the satellite to spin about its own axis