1. A jet plane flies in the air because
(a) The gravity does not act on bodies moving with high speeds
(b) 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 : b
(12)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)