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 12 of 14
- A. is stationary
- B. accelerate downward
- C. Cable brakes and it falls freely towards the earth
- D. accelerates upward
Explanation: The reading of the spring scale will be maximum when the elevator accelerates downwards.
Correct answer: accelerate downward- A. 100 N
- B. 1960 N
- C. 200 N
- D. Zero
Explanation: The apparent weight of an object in an elevator is given by the formula W′=W−ma, where ′W′ is the apparent weight, W is the actual weight…
Correct answer: Zero- A. m(g+a)
- B. g(m+ma/g )
- C. a(m+mg/a )
- D. All of these
Explanation: The apparent weight of the body in an elevator depends on the acceleration of the elevator and the gravitational acceleration.Upward…
Correct answer: All of these- A. Mg
- B. Zero newton
- C. M/g
- D. Ng/R2
Explanation: In an orbiting space shuttle, the astronaut is in free fall along with the shuttle, experiencing a gravitational force that provides the…
Correct answer: Mg- A. g / 4.
- B. g / 2.
- C. g.
- D. 2 g.
Explanation: In an artificial satellite, an object appears weightless when it is in a state of continuous free fall towards Earth.
Correct answer: g.- A. Its magnitude is the same in all directions
- B. The gravitational potential has the same value at all points within it
- C. Its direction is opposite to the direction of motion of attest mass released in it
- D. Its field strength is the same at all points within it
Explanation: d) Its field strength is the same at all points within it:This option suggests that the field strength (magnitude of the gravitational…
Correct answer: Its field strength is the same at all points within it- A. Double
- B. One-half
- C. Remains the same
- D. Four times
Explanation: The formula for gravitational potential energy is U = -GMm/r Hence, U = 1/r. If r/2, then U = 1/(r/2).
Correct answer: Double- A. J/kg
- B. J/(m kg)
- C. J/(m s)
- D. Js
Explanation: The amount of work required to transport a body of unit mass from infinity to some point is known as gravitational potential.
Correct answer: J/kg- A. Newton discovered that gravity pulled everything away from it.
- B. None of these is correct.
- C. Both of these are correct
- D. Newton discovered that gravity pulls everything towards it.
Explanation: Gravity pulls everything towards it - this is a universal truth. Universal truths are always expressed in the present tense even when…
Correct answer: Newton discovered that gravity pulls everything towards it.- A. Clouds
- B. Winds
- C. Gravity
- D. None of these options are correct
Explanation: The atmosphere around the earth is held by gravitational force or gravity due to the earth.
Correct answer: Gravity- A. Greater than unity
- B. Less than unity
- C. Equal to unity
- D. Zero
Explanation: Option A : Gravitational force / electrostatic force is not greater than unity.
Correct answer: Less than unity- A. Coulombs force
- B. Gravitational force
- C. Magnetic force
- D. None of these options are correct
Explanation: In the case of an orbiting planet, the force is gravity. The gravitational attraction of the Sun is an inward (centripetal) force acting…
Correct answer: Gravitational force- A. 1/4th
- B. 1/10th
- C. 2/3rd
- D. 1/6th
Explanation: This is a fact to be memorized. Gravitational acceleration on Moon is 1/6th the gravitational acceleration on Earth.
Correct answer: 1/6th- A. Non uniform
- B. Uniform
- C. Decreasing with distance
- D. Increasing with time
Explanation: The acceleration due to gravity near Earth is approximately uniform. On Earth's surface, the standard acceleration due to gravity, denoted…
Correct answer: Uniform- A. √(gR)
- B. mgR
- C. √(2gR)
- D. mg/2R
Explanation: a) √(gR):This option suggests that the speed of the body must be at least √(gR) to escape from the gravitational field of the Earth.
Correct answer: √(gR)236. Initial velocity of the object with which it goes out of the Earth's gravitational field, is called:
- A. Escape velocity
- B. Threshold velocity
- C. Maximum velocity
- D. Terminal velocity
Explanation: Initial velocity of the object, with which it goes out of the Earth's gravitational field, is called 'escape velocity'.
Correct answer: Escape velocity- A. Terminal velocity
- B. Escape velocity
- C. Critical velocity
- D. Average velocity
Explanation: The minimum speed required to put a satellite into a given orbit around earth is known as Critical velocity of the satellite.
Correct answer: Critical velocity- A. 1.04 W
- B. 1.02 W
- C. 0.98 W
- D. 0.96 W
- E. 2.13 W
Explanation: Because of equality F = - m. (G.M/r ²) = - m.g one draws G = G.M/r ² = [G.M/R ²] * [1 (1+z/R)]² =g○/(1+z/R) ² ► g (z) = g○/(1+z/R) ² ▬▬▬▬▬…
Correct answer: 0.96 W- A. [ML-2T-1]
- B. [ML-2T-2]
- C. [M2L-2T-1]
- D. [M-1L3T-2]
Explanation: Explanation: F = G (m1) (m2) / r² G = F (r²) / (m1) (m2) G = [MLT-2] [L²] / [M] [M] = [M-1L³T-2] These dimensions correspond to surface…
Correct answer: [M-1L3T-2]- A. Total
- B. Potential
- C. Initial kinetic
- D. None of these
Explanation: Escape velocity Is the velocity required by a body to get out of the earth's gravitational pull and leave the earth without further…
Correct answer: Initial kinetic