Universal Law of Gravitation NEET Questions

Physics - Gravitation
Universal Law of Gravitation

Universal Law of Gravitation MCQ Questions


7.
Two spheres of masses M and 4M are placed with their centres 6R apart. A small mass m is placed on the line joining them. The gravitational force on m is zero at a distance x from the sphere of mass M. The value of x is:
A.
2R from M
B.
3R from M
C.
4R from M
D.
1R from M
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ANSWER :
A. 2R from M
8.
Newton's law of gravitation holds good for:
A.
Only terrestrial bodies
B.
Only celestial bodies
C.
Only bodies that are at rest
D.
All bodies in the universe regardless of their size, shape, or location
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ANSWER :
D. All bodies in the universe regardless of their size, shape, or location
9.
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)
10.
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
11.
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)
12.
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)
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