Free Law of Universal Gravitation MCQs with Answers
21 Law of Universal 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.
Every two masses attract each other with a force proportional to the product of their masses and inversely proportional to the square of their separation, expressed as F = Gm₁m₂/r². Questions also involve the gravitational constant, vector direction, superposition of gravitational forces, and the distinction between gravitational force and gravitational field strength.
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- 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. 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. 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. 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: Same- 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 NLaw of Universal Gravitation MCQs: common questions
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There are 21 Law of Universal Gravitation MCQs in the Physics bank, shown 20 to a page with the correct answer and an explanation on each.
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