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Rocket Propulsion and Mechanics - Class XII

Questions covering rocket propulsion principles, fuel consumption effects, and orbital mechanics relevant to rocket science

8 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Payload ratio is :

  1. $\dfrac{\text{fuel mass}}{\text{payload mass}}$
  2. $\dfrac{\text{payload mass}}{\text{fuel mass}}$
  3. $\dfrac{\text{payload mass}}{\text{total rocket mass}}$
  4. None of the above
Question 2 Multiple Choice (Single Answer)

When the fuel in the rocket burns, the rocket moves vertically upward due to :

  1. the exhaust gases escape through the nozzle opposite to the earth and pushes downwards
  2. the exhaust gases escape through the nozzle opposite to the earth and pushes upwards
  3. the exhaust gases escape through the nozzle towards the earth and pushes downwards
  4. the exhaust gases escape through the nozzle towards the earth and pushes upwards
Question 3 Multiple Choice (Single Answer)

Which of the following need to be considered when the rocket operates:
(A): As the rocket consumes fuel at every instant, its mass goes on decreasing.
(B): The acceleration due to gravity changes continuously as the rocket ascends.
(C): The atmosphere offers resistance in the lower strata of atmosphere.

  1. A, B and C
  2. Only B and C
  3. Only C
  4. None of the above
Question 4 Multiple Choice (Single Answer)

Fill in the blank.
Larger the mass of the  rocket _____ is the acceleration.

  1. lesser
  2. larger
  3. same
  4. may be lesser or may be larger
Question 5 Multiple Choice (Single Answer)

Suppose a rocket with an initial mass $M _0$ expels a mass $\delta m$ in the form of gases in time $\Delta t$, then the mass of the rocket after time t is : 

  1. $M _0$
  2. $M _0+\cfrac{\Delta m}{\Delta t}$
  3. $M _0-\cfrac{\Delta m}{\Delta t}$
  4. $M _0-\cfrac{\Delta m}{\Delta t}t$
Question 6 Multiple Choice (Single Answer)

Blow a balloon and let it go. You will find it moving in the direction opposite to the direction in which the air is ejected. This demonstrates :

  1. the principle of rocket propulsion
  2. the principle of combustion
  3. the principle of conservation of energy
  4. None of the above
Question 7 Multiple Choice (Single Answer)

The propulsion of a rocket is based on the principle of conservation of

  1. linear momentum
  2. energy
  3. angular momentum
  4. mass
Question 8 Multiple Choice (Single Answer)

The principle of rocket propulsion depends on :

  1. Newton's third law of motion
  2. Principle of conservation of momentum
  3. Either A and B
  4. Both A and B
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