| Read the following and answer any four questions from [21] to [25]. |
| A rocket is used for carrying a satellite, etc to a suitable height above the ground. Thrust is generated by the propulsion system of the aircraft. For every action there is an equal and opposite reaction. |
| The fuel in the rocket is burnt and exhaust gases are made to escape in the downward direction through a narrow nozzle. |
| As a reaction, rocket moves upwards. Rocket works on the principle of conservation of momentum. |
| According to the principle of conservation of linear momentum, the linear momentum of mass of rocket at any instant must be equal to vector sum of linear momentum of rocket and linear momentum of exhaust gases as the exhaust gases escape. |
| The residual mass of rocket decreases with time. Motion of rocket is an accelerated motion. |
 |
A) Mass of rocket is greater than mass of gases it expels.
B) Mass of rocket is less than mass of gases it expels.
C) Mass of rocket is equal to mass of gases it expels.
D) Mass of rocket is not related to the mass of gases it expels.
Correct Answer: A
Solution :
[a] Mass of rocket is greater than mass of gases as the rocket is used for carrying a satellite etc. to a suitable height above the ground.
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