Question

Assertion: Aeroplanes are made to run on the runway before take off, so that they acquire the necessary lift.
Reason: According to Bernoulli's theorem, as velocity increases pressure decreases and vice versa.

• A. Both assertion and reason are true and reason is correct explanation of assertion.
• B. Both assertion and reason are true but reason is not the correct explanation of assertion.
• C. Assertion is true but reason is false.
• D. Both assertion and reason are false.

Answer 1

The correct option is A Both assertion and reason are true and reason is correct explanation of assertion.

According to Bernoulli's theorem, when wind velocity over the wings is larger than the wind velocity under the wings, pressure of wind over the wings becomes less than the pressure of wind under the wings. This pressure difference between the two sides of the wings provide the necessary lift to the aeroplane.

Hence the correct answer is option (A).