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 14 of 27
131. The average mass per unit volume (or average density) of the earth is:
- A. 3 times the density of water
- B. 4 times the density of water
- C. 5.5 times the density of water
- D. Equal times the density of water
Explanation: The Explanation for this question will be added soon!
Correct answer: 5.5 times the density of water132. The force of gravitation between two bodies 2m apart and each of 1000 kg is:
- A. 1.6 x 10^-7 N
- B. 3.34 x 10^-8 N
- C. 1.67 x 10^-5 N
- D. 3.34 x 10^-5N
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Correct answer: 1.67 x 10^-5 N133. The value of g at a height equal to the radius of the earth from its surface is:
- A. g' = g
- B. g' = g/4
- C. g' = g/9
- D. g' = g/2
Explanation: The Explanation for this question will be added soon!
Correct answer: g' = g/4134. A man in an elevator ascending with an acceleration will conclude that his weight has:
- A. Increased
- B. Decreased
- C. Reduced to zero
- D. Remained constant
Explanation: The Explanation for this question will be added soon!
Correct answer: Increased135. A man in an elevator descending with an acceleration will conclude that his weight has:
- A. Increased
- B. Decreased
- C. Remained constant
- D. Reduced to zero
Explanation: The Explanation for this question will be added soon!
Correct answer: Decreased136. The gravitational force of attraction between the earth and a body of mass 1kg on the surface:
- A. 9.8 N
- B. 9.8 Dyne
- C. 980 N
- D. 98 N
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Correct answer: 9.8 N137. The acceleration due to gravity above the earth surface would be half of its value on the surface of earth at an altitude of (R = 4000 miles):
- A. 1600 miles
- B. 200 miles
- C. 1000 miles
- D. 400 miles
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Correct answer: 1600 miles138. A satellite moving round the earth constitutes:
- A. An inertial frame of reference
- B. Non-inertial frame
- C. Neither inertial nor non-inertial
- D. Both inertial and non-inertial
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Correct answer: Non-inertial frame139. A body of 2kg is suspended from the ceiling of an elevator moving up with an acceleration 'g' its apparent weight in the elevator will be:
- A. 9.8 N
- B. 19.6 N
- C. 129.4 N
- D. 39.2 N
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Correct answer: 39.2 N140. Pull of the earth on a mass of 20 kg on the surface of earth is:
- A. 20 N
- B. 196 N
- C. 19.6 N
- D. 1960 N
Explanation: The Explanation for this question will be added soon!
Correct answer: 196 N