Assertion: A dam for water reservoir is built thicker at bottom than at the loop.
Reason : Pressure of water is very large at the bottom.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. if assertion is true but reason is false.
D. if both assertion and reason are false.

Answer

A

Explanation

With increase in depth the pressure increases from the formula `P prop h` therefore, the force perpendicular to the wall of dam increases. Hence, the dam must have greater strength at base than at top. Due to this dam are made ticker at the base than at the top.