Gravitation CDS Questions

CDS Physics

Gravitation MCQ Questions


13.
If the mass of one of two mutually attracting bodies is doubled, while the other mass and the distance between them remain unchanged, the gravitational force between them will:
A.
Become exactly half its original value
B.
Remain completely unchanged
C.
Become exactly double its original value
D.
Become exactly four times its original value
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ANSWER :
C. Become exactly double its original value
14.
According to Newton's law of gravitation, the force of attraction between two point masses (or two uniform spheres) acts along:
A.
Any arbitrary direction, independent of their relative positions
B.
The straight line joining the centres of the two masses
C.
A line perpendicular to the line joining their centres
D.
A line tangential to their direction of relative motion
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ANSWER :
B. The straight line joining the centres of the two masses
15.
The gravitational force of attraction between two ordinary objects of everyday life, such as two books lying on a table, is:
A.
Always repulsive in nature, rather than attractive
B.
Exactly zero, since gravitation acts only between astronomical bodies
C.
Comparable in strength to the Earth's gravitational pull on the books
D.
Extremely small (practically negligible) because of their relatively tiny masses, though never exactly zero
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ANSWER :
D. Extremely small (practically negligible) because of their relatively tiny masses, though never exactly zero
16.
The acceleration produced in a body that is falling freely under the influence of only the Earth's gravitational pull is called:
A.
Escape acceleration
B.
Orbital acceleration
C.
Terminal acceleration
D.
Acceleration due to gravity (g)
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ANSWER :
D. Acceleration due to gravity (g)
17.
The standard, average value of acceleration due to gravity (g) at the surface of the Earth is approximately:
A.
6.67 m/s^2
B.
9.8 m/s^2
C.
11.2 m/s^2
D.
3.8 m/s^2
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ANSWER :
B. 9.8 m/s^2
18.
The weight of an object is best defined as:
A.
The resistance offered by the object to any change in its state of motion or rest
B.
The total amount of matter contained within the object, unaffected by its location
C.
The force with which the Earth (or any other planet) attracts the object towards its centre, equal to the object's mass multiplied by the local acceleration due to gravity
D.
The volume of space occupied by the object
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ANSWER :
C. The force with which the Earth (or any other planet) attracts the object towards its centre, equal to the object's mass multiplied by the local acceleration due to gravity