Physics GK 07 - Satellites

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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?
2).
What is the value of escape velocity for earth?
3).
On which of the following the escape velocity of a body does not depend?
4).
Which of the following condition will be true for a planet to have atmosphere?
5).
What is the height of geo-stationary satellites from the surface of the earth?
6).
The minimum speed required to put a satellite into a given orbit around earth is known as:
7).
An orbital velocity of a satellite does not depend on which of the following?
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?
9).
What happens to the orbital velocity of a satellite when the radius of orbit is increased?
10).
Which of the following is the orbital velocity of a satellite orbiting very close to the surface of earth?
11).
The time period of a satellite does not depend on which of the following?
12).
What is the time period for a satellite orbiting close to the surface of earth?
13).
The angular momentum of a satellite depends on which of the following?
14).
Which of the following is an essential condition for geostationary satellites of earth?
15).
The Kinetic energy of a satellite is maximum in which of the following conditions?
16).
Water does not fall out of a glass when it is inverted inside a satellite, which is orbiting very close to the earth’s surface. Which of the following is the best reason for this?
17).
Which of the following is incorrect about a satellite?
18).
What is the relation between the orbital velocity and the radius of the orbit for a given planet?
19).
By how much times the orbital speed of a satellite needs to be increased to make it escape the gravitational field?
20).
An earth satellite S has an orbit radius which is 2 times that of a communication satellite C. What will be the period of revolution of S?
21).
What is the orbital velocity of geo stationary satellite?
22).
Which of these represent the Angular momentum of a satellite?
23).
Which of these statements is correct about the energy of a satellite:
24).
What is the effect of increase in radius of orbit on the binding energy of a satellite?
25).
If the time of revolution is T in a satellite, then kinetic energy is proportional to which of the following:
26).
What will be the total energy of a satellite moving around the earth in a circular orbit with speed v and having mass m.
27).
By how much the orbital velocity of Moon has to increase for it to cease to remain the earth’s satellite?
28).
What is the escape velocity of a planet having mass 6 times and radius 2 times as that of earth?
29).
What will happen to a ball if it is dropped from a spacecraft revolving around the earth at a height of 120 km?
30).
The distance of Neptune and Saturn from sun are nearly 1013 and 1012 meters respectively. Assuming that they move in circular orbits, what will be the ratio of their periodic times?
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
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
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
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
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
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
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
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
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
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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