These questions consist two statements each, printed as Assertion and reason, while answering these question you are required to choose any one of the following four responsis:
(a) If both the assertion and reason are true and reason is a true explanation of the assertion.
(b) If both the assertion and reason are true but the reason is not the correct explanation of assertion.
(c ) If the assertion is true but reason is false.
(d) If both the assertion and reason are false.
Q. Assertion: A bubble comes from the bottom of a lake to the top.
Reason: Its radius increases.

Answer

B

Explanation

Since the fluid move from higher pressure to lower pressure and in a fluid, the pressure increases with increase of depth. Hence, the pressure `p_0` will be lasser at the top than that at the bottom `(p_0+hrhog)`. So, the air bubble moves from the bottom to the top and does not move sideways, since the pressure is same at the same level. Further in coming from bottom to top the pressure decreases. According to Boyle's law `rhoV=`constant.
Therefore, if pressure decreases the volume increases, it means radius increases.