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NEET UG PHYSICS MCQ: MECHANICAL PROPERTIES OF FLUIDS
1
Medium
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Analyzing
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Assertion(A): If angle of contact is , then liquid will neither rise nor fall in a capillary.
Reason(R): When angle of contact is , surface is neither convex nor concave inside the capillary. It is flat.
Reason(R): When angle of contact is , surface is neither convex nor concave inside the capillary. It is flat.
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Correct option: B
If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
Option B is correct. Both the assertion and the reason are true, but the reason does not fully explain why the liquid neither rises nor falls. The angle of contact determines the shape of the meniscus, which affects the pressure difference and thus the rise or fall.
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Assertion A: When you squeeze one end of a tube to get toothpaste out from the other end, Pascal's principle is observed.
Reason R: A change in the pressure applied to an enclosed incompressible fluid is transmitted undiminished to every portion of the fluid and to the walls of its container.
In the light of the above statements, choose the most appropriate answer from the options given below. Hydraulic lifts and hydraulic brakes are based
on As the temperature of a liquid is raised, the coefficient of viscosity A horizontal pipe of cross-sectional diameter 5 cm carries water at velocity of . The pipe is connected to a smaller pipe with a cross-sectional diameter 4 cm. the velocity of water through the smaller pipe is If two soap bubble of different radii are connected by a tube