Universal Law of Gravitation NEET Questions

Physics - Gravitation
Universal Law of Gravitation

Universal Law of Gravitation MCQ Questions


13.
The gravitational force is an example of which type of force?
A.
Contact force
B.
Short-range force
C.
Action-at-a-distance force that acts over infinite range
D.
Nuclear force
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ANSWER :
C. Action-at-a-distance force that acts over infinite range
14.
The gravitational force between a hollow spherical shell of uniform density and a point mass situated OUTSIDE it is:
A.
Zero
B.
As if the entire mass of the shell is concentrated at its centre
C.
Distributed uniformly over the shell surface
D.
Depends on the location of the point mass relative to the shell
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ANSWER :
B. As if the entire mass of the shell is concentrated at its centre
15.
The gravitational force on a point mass situated INSIDE a uniform hollow spherical shell is:
A.
Maximum at the centre
B.
Equal to the weight on the surface
C.
Zero
D.
Directed toward the nearest part of the shell
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ANSWER :
C. Zero
16.
The principle of superposition as applied to gravitational forces states:
A.
Gravitational forces between multiple bodies cannot be added
B.
The resultant gravitational force on a particle due to many masses is the vector sum of individual gravitational forces
C.
Only the strongest gravitational force acts when multiple masses are present
D.
The gravitational forces cancel out in a system of many bodies
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ANSWER :
B. The resultant gravitational force on a particle due to many masses is the vector sum of individual gravitational forces
17.
Three equal masses m are fixed at the vertices A, B, C of an equilateral triangle (side = 1m). The net gravitational force on a mass 2m placed at the centroid G (with AG = BG = CG = 1m) is:
A.
Gm² directed toward A
B.
2Gm² directed toward B
C.
Zero (by symmetry — resultant of three equal forces at 120° to each other is zero)
D.
3Gm²
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ANSWER :
C. Zero (by symmetry — resultant of three equal forces at 120° to each other is zero)
18.
For the same equilateral triangle with equal distances AG = BG = CG = 1m , if the mass at vertex A is doubled to 2m , while the other two vertices have mass m, the net force on mass 2m at centroid G is
A.
Zero
B.
2Gm² directed toward A (away from BC side)
C.
4Gm² directed toward A
D.
Gm² directed away from A
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ANSWER :
B. 2Gm² directed toward A (away from BC side)
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