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 13 of 14
- A. 11 km/sec
- B. 10.4 km/sec
- C. 2.4 km/sec
- D. 4.3 km/sec
Explanation: The correct answer is Option C: 2.4 km/sec. The escape velocity for the Moon is approximately 2.374 km/sec.
Correct answer: 2.4 km/sec- A. 3.59 x 10^7 m
- B. 4.23 x 10^7 m
- C. 8.86 x 10^7 m
- D. 6.96 x 10^6 m
Explanation: In this case, once the satellite has been launched, the gravitational force between the satellite and the moon would be providing the…
Correct answer: 8.86 x 10^7 m- A. 2π √ R / g
- B. 2π √ ℓ / g
- C. 1 / 2π √ R / g
- D. f ≥ √(g / r)
Explanation: Explanation:When a spaceship raotates, the centripetal force creates a sensation of artificial gravity on the spaceship's interior.
Correct answer: f ≥ √(g / r)- A. Equal to its real weight
- B. Less than its real weight
- C. Zero
- D. Greater than its real weight
Explanation: The apparent weight of an object is the force exerted by the object on the surface it is resting on.
Correct answer: Greater than its real weight- A. 1000 N
- B. 10 N
- C. 500 N
- D. Zero
Explanation: Being free fall, the man will be in a state of weightlessness As it is a numerical, it can have only one possible answer.
Correct answer: Zero- A. Smaller
- B. Same
- C. Greater
- D. Zero
Explanation: The gravitational constant G is a fundamental constant of nature that expresses the strength of gravitational attraction between two…
Correct answer: Same247. A body weighs 72 kg on the surface of the earth its weights on the surface of the moon will be:
- A. 72 kg
- B. 12kg
- C. 24 kg
- D. 0kg
Explanation: The weight of an object on the surface of the moon can be calculated using the formula:Weight on the moon = Weight on the Earth×…
Correct answer: 12kg- A. [M2L2T]
- B. [M-1L3T-2]
- C. [M2L-2T-2]
- D. [ML-2T-1]
Explanation: The dimensions of the gravitational constant can be expressed using the equation for Newton's law of universal gravitation:F = Gm1m2 /…
Correct answer: [M-1L3T-2]- A. 1/2
- B. 1
- C. 2
- D. No fixed number
Explanation: Inertial mass is a measure of how fast an object accelerates--given the same force, increasing the inertial mass implies decreasing…
Correct answer: 1- A. The mass of a body
- B. The mass of the planet
- C. The average radius of the planet
- D. The density of the planet
Explanation: The escape velocity 'v' of a body depends upon the acceleration due to gravity of the planet and the radius of the planet but not on mass…
Correct answer: The mass of a body- A. Less than 400 N
- B. Less than 500 N
- C. Equal to 500 N
- D. Zero
Explanation: When the same object is taken to a point located at a higher altitude, the weight of the person will be less than 400 N.
Correct answer: Less than 400 N- A. GmMe/Re^2
- B. GMe/Re
- C. GmMe/2Re
- D. -GMe/Re
Explanation: The absolute potential energy (U) of an object, such as a spaceship, on the surface of the Earth can be calculated using the formula:U =…
Correct answer: -GMe/Re- A. √GM/Re
- B. √GMe/Re
- C. √GMe/R²
- D. √GMe/h
Explanation: The correct formula to calculate the orbital speed (v) of a satellite orbiting the Earth is: v = √(GMe/r) where G is the gravitational…
Correct answer: √GMe/Re- A. 1 hour
- B. 2 hour
- C. 12 hours
- D. 24 hours
Explanation: 24 hours: This option is correct. Geostationary communication satellites orbit the Earth at a height of about 35,786 kilometers, taking 24…
Correct answer: 24 hours- A. rotation of earth
- B. mass of body
- C. radius of earth
- D. mass of earth
Explanation: Escape velocity, Ve =√( 2GM/R) Acceleration due to gravity, g= GM/R², which is always constant.
Correct answer: radius of earth- A. stationary
- B. Rotating with the speed of earth
- C. rotating very fastly
- D. rotating very slowly
Explanation: Geostationary satellites remain at the same position with respect to the Earth, so that they scan the same place in a better way.
Correct answer: Rotating with the speed of earth- A. V ∞ r2
- B. V ∞ r
- C. V1 ∞ 1/r
- D. V ∞ 1/r2
Explanation: d) V ∞ 1/r^2 (V is proportional to 1/r^2):This option correctly represents the relationship between the speed (V) of a satellite and the…
Correct answer: V ∞ 1/r2- A. √2gR
- B. √Rg
- C. Rg/2
- D. Rg
Explanation: The force on a mass m, having an angular velocity ω orbiting in a circular path of radius R is F=mRω2.
Correct answer: √Rg- A. 1:1
- B. Square root of 3 :1
- C. 3:1
- D. 9:1
Explanation: To move in a circular orbit, gravitational force provides centripetal force.
Correct answer: Square root of 3 :1- A. mg
- B. Zero newton
- C. m/g
- D. mg/R2
Explanation: Zero. The force of gravity is counterbalanced by the force of angular acceleration.That's how it stays in orbit.Have you ever seen any…
Correct answer: Zero newton