Physics – Communication Systems, Satellite

1. Which of the following conditions must be met for a planet to retain its atmosphere?

  1. The escape velocity must be lesser than the average speed of the gas molecules in its atmosphere
  2. The escape velocity must be equal to the average speed of the gas molecules in its atmosphere
  3. The escape velocity must be greater than the average speed of the gas molecules in its atmosphere
  4. High surface temperature
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Answer: Option C. The escape velocity must be greater than the average speed of the gas molecules in its atmosphere

2. What is the name of the minimum velocity with which an object must move upward so that it can overcome the gravitational pull?

  1. Escape velocity
  2. Gravitational velocity
  3. Initial velocity
  4. Instantaneous velocity
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Answer: Option A. Escape velocity

3. How far is the geostationary satellite from the earth’s surface?

  1. 20,000 kilometers
  2. 15,000 kilometers
  3. 50,000 kilometers
  4. 35,786 kilometers
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Answer: Option D. 35,786 kilometers

4. Which factor does not influence the escape velocity of an object?

  1. The mass of the object
  2. The radius of the planet
  3. The gravitational constant
  4. The mass of the planet
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Answer: Option A. The mass of the object

5. What is the escape velocity on Earth?

  1. 8.0 km/s
  2. 11.2 km/s
  3. 10.5 km/s
  4. 12.5 km/s
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Answer: Option B. 11.2 km/s