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4.1 , newtons laws of motion — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics4.1 , newtons laws of motion1 Mark
MCQ
A jet plane flies in the air because
  • A
    The gravity does not act on bodies moving with high speeds
  • ✓
    The thrust of the jet compensates for the force of gravity
  • C
    The flow of air around the wings causes an upward force, which compensates for the force of gravity
  • D
    The weight of air whose volume is equal to the volume of the plane is more than the weight of the plane
✓

Answer

Correct option: B.
The thrust of the jet compensates for the force of gravity
b
(b) Initially, when the plane is taking off, thrust force is more than the force of gravity. When it is in the air, the force of gravity is compensated by the thrustof the jet. And when the plane lands, at that point of time, the thrust force is less than the force of gravity.

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