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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- A. Also becomes four times
- B. One fourth of the mass of the earth
- C. Twice the mass of the earth
- D. None of these
Explanation: The acceleration due to gravity (g) is directly proportional to the mass of the Earth and inversely proporional to the square of the…
Correct answer: Also becomes four times- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Option C is correct as it gives the correct formula used to calculate the volume of the earth.
Correct answer: Option C- A. Greatest at the equator
- B. Least at the equator
- C. Least at the poles
- D. Same all over the earth surface
Explanation: The value of ( g ), the acceleration due to gravity, is least at the equator compared to other latitudes.
Correct answer: Least at the equator- A. The equator
- B. The poles
- C. A place in between pole and equator
- D. None of these
Explanation: W= mg where g= acceleration due to gravity. At the equator, the weight (mg) of a body is minimum because the Earth's rotation generates a…
Correct answer: The equator- A. Decreases
- B. Increases
- C. Becomes zero
- D. Remains unchanged
Explanation: Certainly, as you go below the surface of the Earth, the value of ( g ) initially decreases due to the diminishing influence of mass…
Correct answer: Decreases- A. Re/4
- B. Re/2
- C. Re
- D. 2Re
Explanation: The correct option is B. The solution is given below:
Correct answer: Re/2- A. Decreasing the orbital speed of the satellite
- B. In creasing the orbital speed of the satellite
- C. Causing the satellite to rotate about its own axis
- D. None of the above
Explanation: Artificial gravity in a satellite to overcome the state of weightlessness experienced by astronauts can be achieved by creating…
Correct answer: Causing the satellite to rotate about its own axis- A. Increase the orbital speed of the satellite
- B. Keep the satellite in its orbit
- C. Keep the orbital radius of the satellite constant
- D. Overcome the weightlessness experienced by astronaut
Explanation: Artificial gravity in a satellite to overcome the state of weightlessness experienced by astronauts can be achieved by creating…
Correct answer: Overcome the weightlessness experienced by astronaut- A. The gravitational force between two bodies
- B. Specific heat capacity of a body
- C. The stress in a wire due to a load hanging from it
- D. The moment of inertia of a body
Explanation: When calculating the stress in a wire, weight is used instead of mass because stress is a force per unit area, and weight is a force.
Correct answer: The stress in a wire due to a load hanging from it- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Option C is correct since it is the correct formula.
Correct answer: Option C- A. Greater
- B. Smaller
- C. Equal
- D. None of these
Explanation: If we consider the Earth to be a perfect sphere (ignoring its actual oblate spheroid shape), the weight of a body at the equator would be…
Correct answer: Greater- A. His moment of inertia decreases
- B. His angular momentum increases
- C. His potential energy decreases
- D. His centre of gravity changes
Explanation: We make use of the principle of conservation of angular momentum for this question.
Correct answer: His moment of inertia decreases- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: Option C is correct as it is the appropriate rearrangement of the formula.
Correct answer: Option C- A. Decreases with altitude
- B. Increases with altitude
- C. Is constant every where
- D. Does not depend upon altitude
Explanation: g= GM/R2 where R is the distance from the center of the earth. g is inversely proportional to the square of R and therefore with increase…
Correct answer: Decreases with altitude- A. Increase
- B. Remain same
- C. Decrease
- D. Becomes twice
Explanation: g= GM/R2 where R is the distance from the center of the earth. g is inversely proportional to the square of R and therefore with increase…
Correct answer: Decrease- A. Couple
- B. Reaction force
- C. Both couple and reaction pair
- D. An action and reaction pair
Explanation: According to Newton's third law of motion, for every action, there is an equal and opposite reaction.
Correct answer: An action and reaction pair- A. Acceleration due to gravity
- B. Inertia mass of a spherical body
- C. Tensional constant of small fibbers
- D. The value of universal gravitational
Explanation: The main aim of the Cavendish experiment, conducted by British scientist Henry Cavendish in 1797-1798, was to measure the mass of the…
Correct answer: The value of universal gravitational- A. Newton's laws of motion
- B. Newton's law of gravitation
- C. Kepler's law
- D. Cavendish apparatus
Explanation: The main aim of the Cavendish experiment, conducted by British scientist Henry Cavendish in 1797-1798, was to measure the mass of the…
Correct answer: Cavendish apparatus- A. Circular motion
- B. Mass of earth
- C. Average density of the air
- D. Weight of the earth
Explanation: Option B is correct as putting the values of the mass of earth m, the gravitational force F, and the distance from the center of the earth…
Correct answer: Mass of earth- A. Half of the original value
- B. One third of the original value
- C. Doubled
- D. One fourth of the original value
Explanation: According to Newton's law of universal gravitation, the force of gravity between two objects is inversely proportional to the square of…
Correct answer: One fourth of the original value