Mechanical Properties of Fluids Class 11 Case Study Questions Physics Chapter 9

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Last Updated on April 21, 2025 by XAM CONTENT

Hello students, we are providing case study questions for class 11 Physics. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 11 Physics. In this article, you will find case study questions for cbse class 11 Physics chapter 9 Mechanical Properties of Fluids.

Chapter	Mechanical Properties of Fluids
Type of Questions	Case Study Questions
Nature of Questions	Competency Based Questions
Board	CBSE
Class	11
Subject	Physics
Useful for	Class 11 Studying Students
Answers provided	Yes
Difficulty level	Mentioned
Important Link	Class 11 Physics Chapterwise Case Study

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Table of Contents

Case Study Questions on Mechanical Properties of Fluids

Case Study Question 1

Passage:
A hydraulic lift works based on Pascal’s Law, which states that pressure applied to an enclosed fluid is transmitted equally in all directions. In a garage, a car weighing 1500 kg is lifted using a small piston of area 0.02 m², connected to a larger piston of area 0.5 m².

Q1. What pressure is required on the smaller piston to lift the car?
(a) $2.94 \times 10^4 \mathrm{~Pa}$
(b) $4.41 \times 10^4 \mathrm{~Pa}$
(c) $7.35 \times 10^4 \mathrm{~Pa}$
(d) $1.47 \times 10^5 \mathrm{~Pa}$

Answer: (d)
Explanation:

$$
P=\frac{F}{A}=\frac{m g}{A}=\frac{1500 \times 9.8}{0.5}=29400 \mathrm{~N} / 0.5=1.47 \times 10^5 \mathrm{~Pa}
$$

Q2. What is the force that must be applied to the smaller piston?
(a) 294 N
(b) 1000 N
(c) 2940 N
(d) 3600 N

Answer: (a)
Explanation:

$$
F=P \times A=1.47 \times 10^5 \times 0.02=2940 \mathrm{~N}
$$

Q3. What does Pascal’s Law state?
(a) Pressure is proportional to area
(b) Pressure decreases with height
(c) Pressure at a point in an enclosed fluid is equal in all directions
(d) Pressure increases with temperature

Answer: (c)
Explanation:
Pascal’s Law → pressure applied to an enclosed fluid is transmitted equally in all directions.

Q4. Why is a hydraulic lift able to lift heavy cars with small force?
(a) Large displacement
(b) Gravitational field
(c) Area ratio of pistons
(d) Vacuum in the lift

Answer: (c)
Explanation:
Using Pascal’s principle, a small force on a small area can balance a large force on a larger area due to force multiplication.

Case Study Question 2

Passage:
A steel ball is dropped into glycerine and reaches terminal velocity after some time. The student is asked to understand how viscous force acts and how terminal velocity is calculated using Stokes’ Law:

$$
v_t=\frac{2 r^2(\rho-\sigma) g}{9 \eta}
$$

Where $\rho=$ density of ball, $\sigma=$ density of fluid, $\eta=$ viscosity, $r=$ radius.

Q1. What forces act on the ball during free fall in a viscous fluid?
(a) Gravitational, Viscous, Buoyant
(b) Only gravity
(c) Magnetic and electrical
(d) Normal force and tension

Answer: (a)
Explanation:
Three forces:

Downward: Weight
Upward: Buoyant force + viscous force

Q2. What happens to the velocity of the ball just after release?
(a) Becomes constant immediately
(b) First increases, then becomes constant
(c) Always decreases
(d) Remains zero

Answer: (b)
Explanation:
Ball accelerates at first, but viscous drag increases with speed → finally reaches terminal velocity

Q3. How does terminal velocity depend on radius of the ball?
(a) $v_t \propto r$
(b) $v_t \propto r^2$
(c) $v_t \propto \frac{1}{r}$
(d) $v_t \propto r^3$

Answer: (b)
Explanation:
From Stokes’ Law:

$$
v_t \propto r^2
$$

Q4. Why does a smaller particle fall more slowly in viscous fluid?
(a) Smaller mass
(b) Less gravitational pull
(c) Smaller radius → lower terminal velocity
(d) More density

Answer: (c)
Explanation:
Smaller radius → much lower v_t → falls more slowly.

We hope the given case study questions for Mechanical Properties of Fluids Class 11 helps you in your learning.

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Topics from which case study questions may be asked

Pressure in fluids
Pascal’s law
Bernoulli’s principle
Viscosity and surface tension

Bernoulli’s Principle explains why airplanes fly and how pressure varies in moving fluids.

For further practice on case study questions related to Mechanical Properties of Fluids Class 11 Physics, we recommend exploring the link given below.

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Frequently Asked Questions (FAQs) on Mechanical Properties of Fluids Case Study Questions

Q1: What are case study questions in Mechanical Properties of Fluids?

A1: Case study questions in Mechanical Properties of Fluids test your ability to apply concepts in real-life scenarios.

Q2: Are these questions asked in board exams?

A2: Yes, CBSE has started including case study/competency-based questions in final exams.

Q3: How should I prepare for case study questions?

A3: Focus on understanding concepts and practicing application-based problems.

Q4: Are answers provided for Class 11 Physics Mechanical Properties of Fluids case study questions?

A4: Yes, detailed answers are provided for all questions.

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