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Class XI
PHYSICS
Chapter-8-GRAVITATION
WORKSHEET-4
1.
Planets situated long distance from the sun take longer time to complete one
revolution due to
a. Kepler`s first law .
b. Kepler`s third law .
c. Kepler`s second law .
d. Newton`s law of gravitation.
2.
The speed of earth revolving round the sun in an elliptical orbit
a. goes on decreasing continuously.
b. is greatest when it is closest to the sun.
c. is greatest when it is farthest from the sun.
d. is constant at all points on the orbit.
3.
Kepler’s second law is based on
a. Newton’s first law .
b. Newton’s second law.
c. special theory of relativity.
d. conservation of angular momentum.
4.
The distance of Neptune and Saturn from the sun is nearly 10 and 10 metre
12
13
respectively. Assuming that they move in circular orbits, their periodic times will
be in the ratio
a. 10
b. 100
c.
1000
5.
The ratio of velocity of a satellite rotating around earth in a circular orbit close to
the surface of the earth to escape velocity from earth is
a. 1:1
b. 1:2
