IIT-JEE 2008 · Paper 1 · Physics Q37

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PhysicsAssertion and reason+3 / -1Question 37 of 69

STATEMENT-1: The stream of water flowing at high speed from a garden hose pipe tends to spread like a fountain when held vertically up, but tends to narrow down when held vertically down.

and

STATEMENT-2: In any steady flow of an incompressible fluid, the volume flow rate of the fluid remains constant.

STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1

STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1

STATEMENT-1 is True, STATEMENT-2 is False

STATEMENT-1 is False, STATEMENT-2 is True

Answer and worked solution

Official answer: A

Statement 2. For steady incompressible flow, $Av$ is constant (continuity). True.

Statement 1. Going up, the water slows down under gravity, so the stream's cross-section must grow: it spreads. Going down, it speeds up and the stream narrows. True, and it follows from Statement 2.

(A)

Topics:Continuity equation

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IIT-JEE 2008 · Paper 1, Physics question 37