10 Question-answer on satellite and escape velocity
1. The period of a satellite in a circular orbit around a planet is independent of
(a) The mass of the planet
(b) The radius of the planet
(c) The mass of the satellite
(d) All the three parameters(a), (b) and (c)
Ans: ( c)
2. The plane of the elliptical orbit of a satellite revolving around earth passes through
(a) Centre of earth
(b) North pole
(c) South pole
(d) None of the above
Ans : (a)
3. For a body to escape from earth, angle at which it should be fired is:
(a) 45˚
(b) >45˚
(c) <45˚
(d) Any angle
Ans: (d)
4. A satellite is orbiting round the earth at a height h above the surface of the earth. If this distance h is increased, the time period of satellite will:
(a) Decrease
(b) Increase
(c) Remain unaffected
(d) Become zero
Ans: (b)
5. An artificial satellite revolves around the earth in a circular orbit with a speed v. If m is the mass of the satellite, its total energy is:
(a) mv2/2
(b) - mv2/2
(c) -m v2
(d) (3/2) mv2
Ans: (b)
6. The ratio of the K.E. required to be given to the satellite to escape earth’s gravitational field to the K.E. required to be given so that the satellite moves in a circular orbit just above earth’s atmosphere is:
(a) One
(b) Half
(c) Two
(d) Infinity
Ans: (c)
7. The earth revolves around the sun in an elliptical orbit with mean radius 9.3 × 188 m in a period of 1 year. Assuming there are no outside influences,
(a) The earth’s kinetic energy remains constant
(b) The earth’s angular momentum remains constant
(c) The earth’s potential energy remains constant
(d) All the answers (a) to (c) are correct
Ans: (b)
8. If a satellite is orbiting the earth very close to its surface, then the orbital velocity mainly depends upon:
(a) The mass of the satellite only
(b) The radius of the earth only
(c) The orbital radius only
(d) The mass of the earth only
Ans: (b)
9. Two satellites are orbiting around the earth in circular orbit orbits of the same radius. One of them is 100 times greater in mass than the other. Their period of revolution are in the ratio:
(a) 1 : 1
(b) 10: 1
(c) 100:1
(d) 1:100
Ans: (a)
10. The escape velocity of a particle of mass m varies directly as
(a) m2
(b) m
(c) m0
(d) m-1
Ans: ( c)