Mechanical Properties of Fluids Practice Questions
Class 11 · Physics · 1594 free MCQs with instant results and detailed explanations.
1594
Total
576
Easy
812
Medium
206
Hard
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Topics in Mechanical Properties of Fluids
Bernoulli's Principle
345
Pascal's Law
231
Surface Tension
363
Pressure
262
Viscosity
393
Sample Questions from Mechanical Properties of Fluids
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
If a fluid is at rest, which statement is true according to Pascal's law?
A.
Pressure is the same in all directions.
B.
Pressure increases with depth.
C.
Pressure varies with temperature.
D.
Pressure changes based on fluid velocity.
Show Answer & Explanation
Correct Answer: A
Pascal's law states that pressure applied to a confined fluid is transmitted undiminished in all directions.
Q2
Easy
What happens to the pressure in a fluid when the temperature increases, assuming the volume remains constant?
A.
Pressure decreases
B.
Pressure remains constant
C.
Pressure increases
D.
Pressure fluctuates unpredictably
Show Answer & Explanation
Correct Answer: C
According to Gay-Lussac's law, pressure increases with temperature at constant volume.
Q3
Easy
In which of the following cases is the pressure exerted by a gas the highest?
A.
A full balloon
B.
An empty bottle
C.
A tire under-inflated
D.
A balloon with a small hole
Show Answer & Explanation
Correct Answer: A
A full balloon has more gas particles colliding with the walls, resulting in higher pressure compared to the others.
Q4
Medium
If a solid object is submerged in a fluid, what is the buoyant force acting on it equal to?
A.
Weight of the object
B.
Weight of the fluid displaced
C.
Density of the object
D.
Density of the fluid
Show Answer & Explanation
Correct Answer: B
According to Archimedes' principle, the buoyant force is equal to the weight of the fluid displaced by the solid.
Q5
Medium
What effect does increasing the temperature of a fluid have on its viscosity?
A.
Increases viscosity
B.
Decreases viscosity
C.
No effect
D.
Increases density
Show Answer & Explanation
Correct Answer: B
With an increase in temperature, the viscosity of a fluid typically decreases due to increased molecular motion.
Q6
Medium
A fluid flowing in a pipe narrows down from a diameter of 4 cm to 2 cm. What happens to the fluid's velocity?
A.
Decreases
B.
Increases
C.
Remains the same
D.
Becomes zero
Show Answer & Explanation
Correct Answer: B
According to the principle of continuity, as the cross-sectional area decreases, the velocity of the fluid must increase.
Q7
Medium
Which of the following statements about pressure is FALSE?
A.
Pressure acts in all directions.
B.
Pressure decreases with depth in a fluid.
C.
Pressure is force per unit area.
D.
Pressure in a fluid at rest is uniform in all directions.
Show Answer & Explanation
Correct Answer: B
Pressure actually increases with depth in a fluid due to the weight of the fluid above.
Q8
Hard
A liquid column of height 'h' in a tube exerts pressure. If the height is doubled, what happens to the pressure at the bottom?
A.
Increases by 2 times
B.
Increases by 4 times
C.
Remains the same
D.
Decreases by half
Show Answer & Explanation
Correct Answer: A
Pressure due to a liquid column is given by P = ρgh, so doubling h doubles the pressure.
Q9
Hard
If the atmospheric pressure decreases, what effect does it have on the boiling point of a liquid?
A.
Increases the boiling point
B.
Decreases the boiling point
C.
No effect
D.
Depends on the liquid
Show Answer & Explanation
Correct Answer: B
Lower atmospheric pressure reduces the boiling point because less energy is required to match that pressure.
Q10
Hard
A barometer is used to measure pressure. If the height of mercury in a barometer is 760 mm, what is the pressure in pascals? (Density of mercury = 13600 kg/m³)
A.
76000 Pa
B.
101325 Pa
C.
760 Pa
D.
136000 Pa
Show Answer & Explanation
Correct Answer: B
Using P = ρgh, we convert mm to meters and calculate the pressure in pascals.
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Mechanical Properties of Fluids — Class 11 Physics Practice Questions Online
This page contains 1594 practice MCQs for the chapter Mechanical Properties of Fluids in Class 11 Physics. The questions are organized by difficulty — 576 easy, 812 medium, 206 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 5 topics, giving you comprehensive coverage of the entire chapter.