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 11 of 14
- A. 900 N
- B. 225 N
- C. 300 N
- D. 100 N
Explanation: The following is the solution:Weight of object on earth W=GMm/r2Now, M=ρV =4πρR3/3∴W=GρπR3Gm/3R2=4πρRGm/3WP/WE=(ρP/ρE)(RP/RE)WP=900/12=75N
Correct answer: 225 N- A. Weight at the planet will be greater
- B. Weight at the Earth will be greater
- C. Mass at the planet will be greater
- D. Mass at the planet will be smaller
Explanation: This is more likely to be true. If the value of g on the planet is 20 m/s², and on Earth, it is approximately 9.8 m/s², then the weight on…
Correct answer: Weight at the planet will be greater- A. 2GmM/3R
- B. GmM/2R
- C. GmM/3R
- D. 5GmM/6R
Explanation: To solve this problem, we can use the concept of gravitational potential energy.
Correct answer: 5GmM/6R- A. Material object only
- B. Both material objects and electromagnetic radiation
- C. Electromagnetic radiations only
- D. none of these
Explanation: Reason: According to Einstein's general theory of relativity, gravity is not just a force between masses but is also the result of the…
Correct answer: Both material objects and electromagnetic radiation- A. 1.745 degree
- B. 1.745 minutes
- C. 1.745 seconds
- D. 1.745 radians
Explanation: The bending of starlight during the solar eclipse of 1919 was measured to be approximately 1.745 degrees, supporting Einstein's theory of…
Correct answer: 1.745 degree- A. OE= ON
- B. OE= 0.5 ON
- C. OE =2ON
- D. No relation exists between OE and ON
Explanation: The angle of bending of light predicted by Einstein's theory is approximately double that predicted by Newton's theory. Therefore, OE = 2ON.
Correct answer: OE= 0.5 ON- A. 1 year
- B. 1 day
- C. 1 hr
- D. 84 min
Explanation: A geostationary satellite orbits the Earth once every 24 hours, which is the same time it takes for the Earth to complete one rotation.
Correct answer: 1 day- A. 24 Natural satellites
- B. 4 Natural satellites
- C. 3 Synchronous satellites
- D. both and and b
Explanation: The GPS consists of a constellation of 24 satellites in orbit around the Earth.
Correct answer: 24 Natural satellites- A. An inertial frame of reference
- B. A non-inertial frame of reference
- C. Neither inertial nor non-inertial
- D. both inertial and non inertial
Explanation: A satellite orbiting the Earth is continuously accelerating toward the Earth (centripetal acceleration due to gravity).
Correct answer: A non-inertial frame of reference- A. 3 channels
- B. 30,000 two-way telephone
- C. 50,000 two-way telephone
- D. both (a) & (b)
Explanation: INTELSAT, or the International Telecommunications Satellite Organization, provides various communication services, including telephone…
Correct answer: 50,000 two-way telephone- A. 35600 km
- B. 356000 km
- C. Such a satellite cannot exist
- D. 6400 km
Explanation: The satellite appears to be at rest when seen from the equator because it orbits the Earth at the same angular velocity as the Earth's…
Correct answer: 35600 km- A. 400m
- B. 40 km
- C. 400 km
- D. 36000 km
Explanation: This is the closest to the average height for Low Earth Orbit (LEO).LEO satellites typically range from an altitude of around 160 km to…
Correct answer: 400 km- A. vanishes at such distances
- B. is balanced by the attraction of the moon
- C. is balanced by the centrifugal force
- D. provides the necessary acceleration for its motion in a curved path
Explanation: An artificial satellite orbiting around the Earth does not fall down because the gravitational force of the Earth provides the necessary…
Correct answer: provides the necessary acceleration for its motion in a curved path- A. Velocity
- B. K.E
- C. Angular momentum
- D. P.E
Explanation: For a satellite in orbit, the angular momentum (L) is constant.
Correct answer: Angular momentum- A. Stationary W.R.T Earth
- B. Rotating W.R.T Earth
- C. Rotating very fast
- D. Rotating very slow
Explanation: Geostationary satellites appear stationary relative to a fixed point on Earth's surface because they orbit the Earth at the same rate as…
Correct answer: Stationary W.R.T Earth- A. Behind
- B. Ahead
- C. Exactly below
- D. it will never reach earth
Explanation: Here is the explanation of the correct optionFc = mv2/rThe satellite will move in a circular orbit.
Correct answer: it will never reach earth- A. 1.0 x 10^3 m/s
- B. 1.1 x 10^4 m/s
- C. 2.4 x 10^3 m/s
- D. 8.2 x 10^6 m/s
Explanation: The escape velocity (ve) is calculated using the formula: ve = √(2GM/R), where G is the gravitational constant, M is the mass of the…
Correct answer: 2.4 x 10^3 m/s- A. 5.6 x 10^7 m/s.
- B. 6.2 x 10^7 m/s.
- C. 6.8 x 10^3 m/s.
- D. 7.4 x 10^3 m/s.
Explanation: To find the orbital velocity, we use the formula v = √(GM/(R+h)), where G is the gravitational constant (6.67 x 10-11 Nm²/kg²), M is the…
Correct answer: 7.4 x 10^3 m/s.- A. 1 hour
- B. 24 hours
- C. 120 hours
- D. 365 hours
Explanation: A geo-stationary satellite completes an orbit around the Earth in 24 hours, which allows it to remain fixed relative to a point on the…
Correct answer: 24 hours- A. \( mg \)
- B. \( ma - mg \)
- C. \( mg + ma \)
- D. \( mg - ma \)
Explanation: The apparent weight of a person in an elevator is the sum of the gravitational force and the force due to the elevator's acceleration
Correct answer: \( mg + ma \)