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MCQ Questions for CBSE Class 12 with Answers
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Quiz
CBSE
/
Class 11
/
Physics
/
Chapter 8 Gravitation
1.
The radius of the earth is 6400 km and g = 10 m/s². In order that a body of 5 kg weighs zero at the equator, the angular speed of the earth is
1/80 rad /s
1/400 rad /s
1/800 rad /s
1/1600 rad /s
2.
A body weighs 500 N on the surface of the earth. How much would it weight half way below the surface of the earth?
1000 N
500 N
250 N
125 N
3.
The time - period of a satellite of earth is 5 hours. If the separation between the earth and the satellite is increased to 4 times the previous value, the new time - period will become
10 hours
20 hours
40 hours
80 hours
4.
A missile is launched with a velocity less than the escape velocity. The sum of its kinetic and potential energy is
Positive
Negative
Zero
may be positive or negative
5.
What would be the duration of the year if the distance between the earth and the sun gets doubled?
1032 days
129 days
365 days
730 days
6.
If a body of mass m is taken out from a point below the surface of earth equal to half the radius of earth, R, to a height R above the earths surface, then work done on it will be
(5/6) mgR
(6/7) mgR
(7/8) mgR
(8/9) mgR
7.
A artificial satellite moving in a circular orbit around the earth has a total (kinetic + potential) energy E0. Its potential energy is
2E0
E0
1.5 E0
-E0
8.
A body is projected vertically from the surface of the earth of radius R with velocity equal to half of the escape velocity. The maximum height reached by the body is
R
R/2
R/3
R/4
9.
The escape velocity for a body projected vertically upwards from the surface of the earth is 11 km/s. If the body is projected at an angle of 450 with the vertical, the escape velocity will be
11/√2 km/s
11√2 km/s
2 km/s
11 km/s
10.
There is no atmosphere on the moon because
it is closer to the earth
it revolves round the earth
it gets light from the sun
the escape velocity of gas molecules is less than their root mean square velocity here
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