Q. According to Bernoulli's equation, an increase in the speed of a fluid occurs simultaneously with a: (2020)
A.
Increase in pressure
B.
Decrease in pressure
C.
Increase in temperature
D.
Decrease in density
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Solution
Bernoulli's equation 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. According to Bernoulli's principle, an increase in the speed of a fluid occurs simultaneously with a decrease in which of the following? (2019)
A.
Pressure
B.
Density
C.
Viscosity
D.
Temperature
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Solution
Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure.
Correct Answer: A — Pressure
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Q. According to Bernoulli's principle, an increase in the speed of a fluid occurs simultaneously with a: (2020)
A.
Increase in pressure
B.
Decrease in pressure
C.
Increase in temperature
D.
Decrease in density
Show solution
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. According to Bernoulli's principle, an increase in the speed of a fluid occurs simultaneously with a decrease in:
A.
Pressure
B.
Temperature
C.
Density
D.
Viscosity
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Solution
Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure.
Correct Answer: A — Pressure
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Q. According to Bernoulli's principle, what happens to the pressure of a fluid when its velocity increases?
A.
Pressure increases
B.
Pressure decreases
C.
Pressure remains constant
D.
Pressure fluctuates
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Solution
Bernoulli's principle states that an increase in the velocity of a fluid results in a decrease in pressure.
Correct Answer: B — Pressure decreases
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Q. In a fluid at rest, the pressure at a point depends on which of the following? (2021)
A.
Depth of the fluid
B.
Shape of the container
C.
Volume of the fluid
D.
Temperature of the fluid
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Solution
In a fluid at rest, the pressure at a point depends on the depth of the fluid above that point.
Correct Answer: A — Depth of the fluid
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Q. In a fluid at rest, the pressure at a point depends on:
A.
The height of the fluid column above it
B.
The shape of the container
C.
The volume of the fluid
D.
The temperature of the fluid
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Solution
In a fluid at rest, the pressure at a point depends on the height of the fluid column above it, as described by hydrostatic pressure.
Correct Answer: A — The height of the fluid column above it
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Q. In a fluid, what is the relationship between depth and pressure?
A.
Pressure increases with depth
B.
Pressure decreases with depth
C.
Pressure remains constant
D.
Pressure is independent of depth
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Solution
In a fluid, pressure increases with depth due to the weight of the fluid above.
Correct Answer: A — Pressure increases with depth
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Q. In a fluid, what is the term for the height of a fluid column that exerts a certain pressure?
A.
Hydrostatic Height
B.
Fluid Column Height
C.
Hydrostatic Head
D.
Fluid Pressure Height
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Solution
Hydrostatic head is the height of a fluid column that exerts a certain pressure, calculated as pressure divided by the density and gravitational acceleration.
Correct Answer: C — Hydrostatic Head
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Q. In a fluid, what is the term for the surface phenomenon that causes the surface to behave like a stretched elastic membrane?
A.
Viscosity
B.
Surface Tension
C.
Capillarity
D.
Hydrostatic Pressure
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Solution
Surface tension is the property of a fluid that causes its surface to behave like a stretched elastic membrane.
Correct Answer: B — Surface Tension
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Q. In fluid mechanics, what does the term 'streamline' refer to? (2020)
A.
Path of a fluid particle
B.
Layer of fluid
C.
Viscous flow
D.
Turbulent flow
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Solution
A streamline refers to the path followed by a fluid particle in a steady flow.
Correct Answer: A — Path of a fluid particle
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Q. The buoyant force acting on an object submerged in a fluid is equal to:
A.
The weight of the object
B.
The weight of the fluid displaced
C.
The density of the object
D.
The pressure of the fluid
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Solution
According to Archimedes' principle, the buoyant force is equal to the weight of the fluid displaced by the object.
Correct Answer: B — The weight of the fluid displaced
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Q. The buoyant force on an object submerged in a fluid is equal to: (2022)
A.
The weight of the object
B.
The weight of the fluid displaced
C.
The density of the object
D.
The volume of the object
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Solution
According to Archimedes' principle, the buoyant force on a submerged object is equal to the weight of the fluid displaced by the object.
Correct Answer: B — The weight of the fluid displaced
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Q. The viscosity of a fluid is a measure of its: (2022)
A.
Density
B.
Pressure
C.
Resistance to flow
D.
Temperature
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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 happens to the buoyant force when the density of the fluid increases? (2022)
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
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Solution
The buoyant force increases with the density of the fluid, as it is directly proportional to the fluid's density.
Correct Answer: B — It increases
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Q. What is the effect of increasing temperature on the viscosity of liquids? (2019)
A.
Increases viscosity
B.
Decreases viscosity
C.
No effect
D.
Depends on the liquid
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Solution
Increasing temperature generally decreases the viscosity of liquids, allowing them to flow more easily.
Correct Answer: B — Decreases viscosity
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Q. What is the effect of temperature on the viscosity of a liquid? (2020)
A.
Increases with temperature
B.
Decreases with temperature
C.
Remains constant
D.
Varies randomly
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Solution
The viscosity of a liquid generally decreases with an increase in temperature, making it flow more easily.
Correct Answer: B — Decreases with temperature
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Q. What is the hydrostatic pressure at a depth of 10 meters in water? (Density of water = 1000 kg/m³, g = 9.81 m/s²) (2022)
A.
9810 Pa
B.
10000 Pa
C.
98100 Pa
D.
1000 Pa
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Solution
Hydrostatic pressure is given by P = ρgh. Thus, P = 1000 kg/m³ * 9.81 m/s² * 10 m = 98100 Pa.
Correct Answer: C — 98100 Pa
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Q. What is the principle behind the operation of a hydraulic lift? (2019)
A.
Bernoulli's principle
B.
Archimedes' principle
C.
Pascal's law
D.
Newton's law
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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 principle that states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure?
A.
Bernoulli's Principle
B.
Archimedes' Principle
C.
Pascal's Law
D.
Newton's Law
Show solution
Solution
Bernoulli's Principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure.
Correct Answer: A — Bernoulli's Principle
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Q. What is the principle that states that the buoyant force on an object is equal to the weight of the fluid displaced by the object?
A.
Archimedes' Principle
B.
Pascal's Law
C.
Bernoulli's Principle
D.
Newton's Law
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Solution
Archimedes' Principle states that the buoyant force on an object is equal to the weight of the fluid displaced by the object.
Correct Answer: A — Archimedes' Principle
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Q. What is the principle that states that the pressure in a fluid decreases as the fluid's velocity increases?
A.
Bernoulli's Principle
B.
Pascal's Principle
C.
Archimedes' Principle
D.
Hydrostatic Principle
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Solution
Bernoulli's Principle states that an increase in the velocity of a fluid occurs simultaneously with a decrease in pressure.
Correct Answer: A — Bernoulli's Principle
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Q. What is the relationship between pressure and depth in a fluid at rest? (2019)
A.
Pressure increases with depth
B.
Pressure decreases with depth
C.
Pressure remains constant
D.
Pressure varies randomly
Show solution
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. What is the term for the phenomenon where a liquid's surface behaves like a stretched elastic membrane?
A.
Surface Tension
B.
Capillarity
C.
Viscosity
D.
Hydrostatic Pressure
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Solution
Surface tension is the phenomenon where a liquid's surface behaves like a stretched elastic membrane due to cohesive forces.
Correct Answer: A — Surface Tension
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Q. What is the term for the ratio of the density of a substance to the density of a reference substance, typically water?
A.
Specific gravity
B.
Viscosity
C.
Pressure
D.
Buoyancy
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Solution
Specific gravity is the ratio of the density of a substance to the density of a reference substance, typically water.
Correct Answer: A — Specific gravity
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Q. Which of the following describes the buoyant force acting on an object submerged in a fluid? (2020)
A.
It is equal to the weight of the fluid displaced.
B.
It is equal to the weight of the object.
C.
It is always greater than the weight of the object.
D.
It is independent of the fluid density.
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Solution
According to Archimedes' principle, the buoyant force on a submerged object is equal to the weight of the fluid displaced by the object.
Correct Answer: A — It is equal to the weight of the fluid displaced.
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Q. Which of the following describes the flow of an ideal fluid? (2022)
A.
Incompressible and non-viscous
B.
Viscous and compressible
C.
Incompressible and viscous
D.
Compressible and non-viscous
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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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Q. Which of the following describes the property of a fluid that resists flow? (2020)
A.
Viscosity
B.
Density
C.
Pressure
D.
Surface Tension
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Solution
Viscosity is the measure of a fluid's resistance to flow. Higher viscosity means the fluid flows less easily.
Correct Answer: A — Viscosity
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Q. Which of the following describes the relationship between pressure and volume of a gas at constant temperature?
A.
Charles's Law
B.
Boyle's Law
C.
Avogadro's Law
D.
Ideal Gas Law
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Solution
Boyle's Law states that the pressure of a gas is inversely proportional to its volume at constant temperature.
Correct Answer: B — Boyle's Law
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Q. Which of the following statements is true about surface tension? (2019)
A.
It is a property of solids
B.
It causes liquids to minimize their surface area
C.
It is independent of temperature
D.
It is only present in water
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Solution
Surface tension is a property of liquids that causes them to minimize their surface area, allowing them to form droplets.
Correct Answer: B — It causes liquids to minimize their surface area
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