Assertion: A helicopter must necessarily have two propellers.
Reason : Two propellers are provided in helicopter in order to conserve linear momentum.

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

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If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.

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If Assertion is true statement but Reason is false

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If both Assertion and Reason are false statements.

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Solution

The correct option is B If Assertion is true statement but Reason is false
If there were only one propeller in the helicopter, the helicopter itself, would have turned in opposite direction of the direction of propeller due to conservation of angular momentum. Thus two propeller provides helicopter a steady movement.

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Assertion: A helicopter must necessarily have two propellers. Reason : Two propellers are provided in helicopter in order to conserve linear momentum.

Assertion: A helicopter must necessarily have two propellers.
Reason : Two propellers are provided in helicopter in order to conserve linear momentum.