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c.
d.
6. Figure shows the motion of a planet around the sun in an elliptical orbit with sun at the
focus. The shaded areas are equal but path DC is smaller than AB. If t 1 and t 2 represent the
time taken for the planet to move from A to B, and D to C respectively, then
a. t1 < t2
b. t1 > t2
c. t1 = t2
d. 2 t1 = t2
7. If the distance between the Earth and the Sun were half of its present value, the number of
days in a year would have been:
a. 64.5
b. 129
c. 182.5
d. 730
8.
A satellite of the earth is revolving in a circular orbit with a uniform speed v. If the
gravitational force suddenly disappears, the satellite will
a. Continue to move with velocity v along the original orbit.
b. Move with a velocity v tangentially to the original orbit.
c. Fall down with increasing velocity.
Ultimately come to rest, somewhere on the original orbit.
9.
A planet is revolving around the sun in an elliptical orbit. Which out of following
remains constant?
a. Linear Speed
b. Angular momentum
c. Kinetic energy
d. Potential energy
10.
The period of revolution of a certain planet in an orbit of radius R is T. Its period
of revolution in an orbit of radius 4R will be
a. 2T.
b. 2√2 T.
c. 4T.
d. 8T.
