Physics GK 07 - Satellites

1. What do we call the minimum velocity with which a body must be projected up, so as to enable it to just overcome the gravitational pull?
[A] Orbital velocity
[B] Gravitational velocity
[C] Escape velocity
[D] None of the above

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2. What is the value of escape velocity for earth?
[A] 9.8 km s-2
[B] 1.6 km s-2
[C] 11.2 km s-2
[D] 7.92 km s-2

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3. On which of the following the escape velocity of a body does not depend?
[A] Mass of the body
[B] Radius of the planet
[C] Mass of the planet
[D] None of the above

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4. Which of the following condition will be true for a planet to have atmosphere?
[A] velocity of molecules in its atmosphere is lesser than escape velocity
[B] velocity of molecules in its atmosphere is greater than escape velocity
[C] velocity of molecules in its atmosphere is twice the escape velocity
[D] velocity of molecules in its atmosphere is equal to the escape velocity

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5. What is the height of geo-stationary satellites from the surface of the earth?
[A] 30000 km
[B] 36000 km
[C] 48000 km
[D] 72000 km

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6. The minimum speed required to put a satellite into a given orbit around earth is known as:
[A] Escape velocity
[B] Orbital velocity
[C] Kinetic velocity
[D] None of the above

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7. An orbital velocity of a satellite does not depend on which of the following?
[A] Radius of the planet
[B] Mass of the planet
[C] Radius of orbit
[D] Mass of the satellite

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8. Two satellites, A having mass of 500 kgs and B having mass of 1200 kgs, are launched from earth. Which of these will have a greater orbital velocity if the radius of orbit is same for both?
[A] Satellite A
[B] Satellite B
[C] Both satellites will have the same orbital velocity
[D] Cant be determined

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9. What happens to the orbital velocity of a satellite when the radius of orbit is increased?
[A] it decreases
[B] it increases
[C] it remains same
[D] None of the above

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10. Which of the following is the orbital velocity of a satellite orbiting very close to the surface of earth?
[A] 7.92 km/s
[B] 9.8 km/s
[C] 11.2 km/s
[D] 14.8 km/s

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