Properties of Matter - Mechanical Properties of Fluids
Q. According to Bernoulli's principle, an increase in the speed of a fluid occurs simultaneously with a: (2020)
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A.
Increase in pressure
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B.
Decrease in pressure
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C.
Increase in temperature
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D.
Decrease in density
Solution
Bernoulli's principle states that an increase in the speed of a fluid results in a decrease in pressure.
Correct Answer: B — Decrease in pressure
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Q. The viscosity of a fluid is a measure of its: (2022)
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A.
Density
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B.
Pressure
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C.
Resistance to flow
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D.
Temperature
Solution
Viscosity measures a fluid's resistance to flow; higher viscosity means the fluid flows less easily.
Correct Answer: C — Resistance to flow
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Q. What is the principle behind the operation of a hydraulic lift? (2019)
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A.
Bernoulli's principle
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B.
Archimedes' principle
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C.
Pascal's law
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D.
Newton's law
Solution
A hydraulic lift operates based on Pascal's law, which states that pressure applied to a confined fluid is transmitted undiminished in all directions.
Correct Answer: C — Pascal's law
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Q. What is the relationship between pressure and depth in a fluid at rest? (2019)
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A.
Pressure increases with depth
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B.
Pressure decreases with depth
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C.
Pressure remains constant
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D.
Pressure varies randomly
Solution
In a fluid at rest, pressure increases with depth due to the weight of the fluid above.
Correct Answer: A — Pressure increases with depth
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Q. Which of the following describes the flow of an ideal fluid? (2022)
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A.
Incompressible and non-viscous
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B.
Viscous and compressible
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C.
Incompressible and viscous
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D.
Compressible and non-viscous
Solution
An ideal fluid is defined as being incompressible and non-viscous, meaning it has no internal friction.
Correct Answer: A — Incompressible and non-viscous
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