Universal Law of Gravitation NEET Questions

Physics - Gravitation

Universal Law of Gravitation MCQ Questions


13.
The gravitational force between two masses is a:
A.
Repulsive force that can be shielded
B.
Attractive force that cannot be shielded (no gravitational shielding)
C.
Repulsive force that cannot be shielded
D.
Attractive force that can be shielded using a metallic hollow sphere
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ANSWER :
B. Attractive force that cannot be shielded (no gravitational shielding)
14.
Two spheres of masses m and M are placed in air, and the gravitational force between them is F. If the space around them is filled with a liquid of specific density 3, what will be the gravitational force?

NEET - 2017

A.
3F
B.
F
C.
F/3
D.
F/9
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ANSWER :
B. F
15.
Two identical hollow spheres of negligible thickness are in contact. The force of gravitation between them is proportional to:

NEET - 2019

A.
R
B.
R²
C.
R⁴
D.
R³
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ANSWER :
D. R³
16.
Which of the following correctly represents Newton's Law of Gravitation in vector form (force on m₂ due to m₁, where r̂ is unit vector from m₁ to m₂)?
A.
F = +Gm₁m₂r̂/r²
B.
F = -Gm₁m₂r̂/r²
C.
F = Gm₁m₂r̂/r
D.
F = -Gm₁m₂r̂/r³
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ANSWER :
B. F = -Gm₁m₂r̂/r²
17.
The value of G was first determined experimentally by:
A.
Isaac Newton
B.
Galileo Galilei
C.
Henry Cavendish (1798)
D.
Johannes Kepler
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ANSWER :
C. Henry Cavendish (1798)
18.
In Cavendish's experiment, at equilibrium, the gravitational torque equals the restoring torque. If M and m are masses, d is separation, L is bar length, and θ is angle of twist, then G is obtained from:
A.
G = τd²θ/(MmL)
B.
G = τθd²/(MmL)
C.
G = MmL/(τd²θ)
D.
G = Mmτθ/(Ld²)
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ANSWER :
B. G = τθd²/(MmL)