Gravitation CDS Questions

CDS Physics

Gravitation MCQ Questions


7.
Kepler's third law (the Law of Periods) relates the orbital time period (T) of a planet to its mean orbital radius (r) as:
A.
T^2 is directly proportional to r^3
B.
T^2 is directly proportional to r
C.
T^3 is directly proportional to r^2
D.
T is directly proportional to r
😑 View Answer Rough Work Error
ANSWER :
A. T^2 is directly proportional to r^3
8.
The minimum speed required for an object to permanently escape a planet's gravitational field, without any further propulsion, is called its:
A.
Terminal velocity
B.
Escape velocity
C.
Orbital velocity
D.
Critical velocity
😑 View Answer Rough Work Error
ANSWER :
B. Escape velocity
9.
The approximate escape velocity required for an object to escape the Earth's gravitational field from its surface is:
A.
3.6 km/s
B.
7.9 km/s
C.
25 km/s
D.
11.2 km/s
😑 View Answer Rough Work Error
ANSWER :
D. 11.2 km/s
10.
A satellite that takes exactly about 24 hours to complete one revolution around the Earth (matching the Earth's own rotation), and therefore appears stationary relative to a fixed point on the Earth's surface, is called a:
A.
Polar satellite
B.
Geostationary satellite
C.
Sun-synchronous satellite
D.
Escape satellite
😑 View Answer Rough Work Error
ANSWER :
B. Geostationary satellite
11.
For an artificial satellite to remain in a stable orbit around the Earth, the centripetal force required for its circular motion is provided entirely by:
A.
The continuous thrust generated by the satellite's own engines
B.
The gravitational force of attraction exerted by the Earth on the satellite
C.
The magnetic force exerted on it by the Earth's magnetic field
D.
The frictional force between the satellite and the surrounding atmosphere
😑 View Answer Rough Work Error
ANSWER :
B. The gravitational force of attraction exerted by the Earth on the satellite
12.
If the distance between two bodies of fixed mass is halved, the gravitational force of attraction between them becomes:
A.
8 times stronger than before
B.
Exactly the same as before
C.
4 times stronger than before
D.
2 times stronger than before
😑 View Answer Rough Work Error
ANSWER :
C. 4 times stronger than before