Assertion A Helicopter Must Necessarily Have Two Propellers. Reason Two Propellers Are Provided Inhelicopter In Order To Conserve Linear Momentum. (A) Both Assertion And Reason Are True. (B) Both Assertion And Reason Are False.(C) Assertion Is True And Reason Is False. (D) Assertion Is False And Reason Is True.

The correct answer is (C) Assertion Is True And Reason Is False.

A helicopter must necessarily have two propellers. If there were only one propeller, the helicopter itself would have turned in the opposite direction of the propeller, which is due to the conservation of angular momentum. Thus two propellers provide the helicopter with a steady movement.

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