NCERT  ·  Physics  ·  Class XI  ·  Ch.10

Mechanical Properties of Fluids
MCQ Series

Pressure · Bernoulli · Viscosity · Surface Tension — 50 expert questions crafted for CBSE Boards and JEE preparation.

⚡ Start Quiz 📊 Analytics
50
Questions
30 min
Suggested Time
6
Topics Covered
22
CBSE Level
Question Intelligence

Quiz Analytics

A data-driven breakdown of all 50 questions by difficulty, exam origin and topic distribution.

📈 Distribution Overview

50
Total Questions
CBSE Level
22
JEE Main Level
18
JEE Advanced Level
10

🗂 Topic Coverage

Pressure & Hydrostatics
16%
Pascal Law & Hydraulic Systems
10%
Surface Tension & Capillarity
18%
Viscosity & Stokes Law
20%
Fluid Dynamics (Bernoulli)
24%
Reynolds Number & Flow Types
12%
22
CBSE Level
18
JEE Main Level
10
JEE Advanced Level
Conceptual Framework

Key Concept Highlights

6 foundational pillars that power every question in this quiz. Understand these, and the answers follow naturally.

💧
Pressure in Fluids
Pressure in a fluid increases with depth according to P = ρgh and acts equally in all directions.
⚙️
Pascal’s Law
Pressure applied to an enclosed fluid is transmitted equally throughout the fluid, forming the principle of hydraulic machines.
🌊
Fluid Flow & Continuity
For an incompressible fluid the product of cross-sectional area and velocity remains constant: A₁v₁ = A₂v₂.
✈️
Bernoulli’s Principle
Along a streamline the total mechanical energy of the fluid remains constant: P + ½ρv² + ρgh = constant.
🫧
Surface Tension
Surface molecules experience inward cohesive force producing surface tension, responsible for droplets, bubbles and capillary rise.
🛢️
Viscosity
Internal resistance offered by a fluid to flow; described by Newton’s law of viscosity and Stokes drag force.
Pedagogical Value

Why MCQs Matter

Multiple-choice questions are not mere guessing games — they are the sharpest diagnostic tool available to a competitive exam aspirant.

~35%

of JEE/NEET Physics questions directly or indirectly involve Fluid Mechanics concepts

Quick Reference

Important Formula Capsules

9 must-memorise equations that surface repeatedly across CBSE and JEE papers.

Hydrostatic Pressure
\[ P = P_0 + \rho g h \]
Continuity Equation
\[ A_1 v_1 = A_2 v_2 \]
Bernoulli Equation
\[ P + \frac{1}{2}\rho v^2 + \rho gh = \text{constant} \]
Surface Tension
\[ T = \frac{F}{L} \]
Capillary Rise
\[ h = \frac{2T\cos\theta}{\rho g r} \]
Excess Pressure Drop
\[ \Delta P = \frac{2T}{r} \]
Soap Bubble Pressure
\[ \Delta P = \frac{4T}{r} \]
Stokes Law
\[ F = 6\pi \eta r v \]
Reynolds Number
\[ Re = \frac{\rho v d}{\eta} \]
Learning Outcomes

What You Will Learn

By completing this quiz set you will have exercised all the following competencies.

01 Explain hydrostatic pressure variation with depth in liquids
02 Apply Pascal’s law to hydraulic machines and hydraulic brakes
03 Solve numerical problems using continuity equation and Bernoulli principle
04 Understand the origin of surface tension and capillary action
05 Apply Stokes law to determine terminal velocity in viscous fluids
06 Differentiate laminar and turbulent flow using Reynolds number
07 Solve conceptual and numerical problems asked in JEE and NEET exams
Exam Preparation

Strategy & Preparation Tips

5 evidence-based strategies to maximise your score in CBSE Boards and JEE.

01
Step 01
Master Hydrostatics
Remember the pressure relation P = ρgh and understand how pressure varies with depth and density.
02
Step 02
Understand Bernoulli Physically
Higher fluid speed corresponds to lower pressure. This explains Venturi meter, atomiser and aircraft lift.
03
Step 03
Memorise Surface Tension Cases
Soap bubble → 4T/r, liquid drop → 2T/r, air bubble → 2T/r — frequently asked conceptual traps.
04
Step 04
Practice Viscosity Problems
Terminal velocity and Stokes law questions are common in NEET and JEE.
05
Step 05
Timed Practice
Attempt the 50-question set within 30 minutes to simulate JEE/NEET exam pacing.

Ready to Test Your Mastery?

50 questions  ·  Elapsed timer  ·  Instant scored results

⚡ Begin Mechanical Properties of Fluids Quiz
🎯 Knowledge Check

Physics — MECHANICAL PROPERTIES OF FLUIDS

50 Questions Class 11 MCQs
1
Which of the following quantities has the same unit as pressure?
(Exam: CBSE)
2
The SI unit of coefficient of viscosity is:
(Exam: CBSE)
3
The pressure at a depth \(h\) in a liquid of density \(\rho\) is given by:
(Exam: CBSE)
4
Atmospheric pressure is measured using:
(Exam: CBSE)
5
Pascal’s law is applicable to:
(Exam: CBSE)
6
The pressure exerted by a liquid depends on:
(Exam: CBSE)
7
Which quantity remains constant in steady flow of an incompressible fluid?
(Exam: CBSE)
8
The continuity equation is based on conservation of:
(Exam: CBSE)
9
According to Bernoulli’s theorem, an increase in speed causes:
(Exam: CBSE)
10
Unit of surface tension is:
(Exam: CBSE)
11
Surface tension arises due to:
(Exam: CBSE)
12
Angle of contact for pure water on clean glass is:
(Exam: CBSE)
13
Capillary rise is maximum when:
(Exam: CBSE)
14
The excess pressure inside a soap bubble of radius \(r\) is:
(Exam: CBSE)
15
Viscosity is the property of fluid by virtue of which:
(Exam: CBSE)
16
Poiseuille’s law applies to:
(Exam: NEET)
17
The terminal velocity of a body in a viscous fluid depends on:
(Exam: NEET)
18
Reynolds number is dimensionless because it is:
(Exam: NEET)
19
Flow becomes turbulent when Reynolds number is:
(Exam: NEET)
20
Which quantity remains constant along a streamline?
(Exam: NEET)
21
The lift on an aeroplane wing is explained by:
(Exam: NEET)
22
The unit of kinematic viscosity is:
(Exam: NEET)
23
Streamline flow is also called:
(Exam: NEET)
24
Venturi meter works on the principle of:
(Exam: NEET)
25
When temperature increases, viscosity of liquids:
(Exam: NEET)
26
For gases, viscosity with temperature:
(Exam: NEET)
27
Hydraulic lift works on:
(Exam: NEET)
28
The pressure at the same depth in different liquids depends on:
(Exam: NEET)
29
In a capillary tube, liquid rises due to:
(Exam: NEET)
30
The work done in increasing the surface area of liquid is stored as:
(Exam: NEET)
31
A sphere falling in a viscous fluid reaches terminal velocity when:
(Exam: JEE)
32
In laminar flow, velocity of liquid is maximum at:
(Exam: JEE)
33
Bernoulli’s equation assumes:
(Exam: JEE)
34
If the speed of fluid doubles, its kinetic energy per unit volume becomes:
(Exam: JEE)
35
The SI unit of pressure head is:
(Exam: JEE)
36
For a liquid of high viscosity, the flow is generally:
(Exam: JEE)
37
Which equation gives excess pressure in liquid drop?
(Exam: JEE)
38
The drag force on a sphere in viscous medium varies as:
(Exam: JEE)
39
Which factor does NOT affect Reynolds number?
(Exam: JEE)
40
In a horizontal pipe, Bernoulli’s equation reduces to:
(Exam: JEE)
41
The dimension of surface tension is:
(Exam: JEE)
42
The excess pressure inside an air bubble in liquid is:
(Exam: JEE)
43
Bernoulli’s equation is a statement of conservation of:
(Exam: JEE)
44
Which flow is characterized by eddies?
(Exam: JEE)
45
Hydraulic brakes work because:
(Exam: JEE)
46
In Poiseuille’s equation, rate of flow varies with radius as:
(Exam: JEE)
47
A manometer measures:
(Exam: JEE)
48
The pressure at a point in a liquid is same in all directions is known as:
(Exam: JEE)
49
Terminal velocity is independent of:
(Exam: JEE)
50
For maximum lift on an aircraft wing, the air speed above the wing should be:
(Exam: JEE)
📚
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Frequently Asked Questions

Mechanical properties of fluids describe how liquids and gases respond to forces, including their ability to flow, transmit pressure, resist motion, and show surface effects like viscosity and surface tension.

A fluid is a substance that cannot resist shear stress in static condition and continuously deforms under even a small tangential force. Liquids and gases are fluids.

Pressure is the normal force exerted per unit area by a fluid on any surface in contact with it, given by P = F/A.

Pressure increases with depth according to P = P0 + ?gh, where ? is density, g is acceleration due to gravity, and h is depth.

Pascal’s law states that pressure applied to an enclosed fluid is transmitted equally and undiminished to all parts of the fluid and the container walls.

Pascal’s law is applied in hydraulic lifts, hydraulic brakes, hydraulic presses, and hydraulic jacks.

Buoyant force is the upward force exerted by a fluid on an immersed body, opposing the weight of the body.

A body immersed in a fluid experiences an upward force equal to the weight of the fluid displaced by it.

Objects float if the buoyant force equals or exceeds their weight, usually when their average density is less than the fluid density.

Viscosity is the internal resistance of a fluid to the relative motion between its layers.

The coefficient of viscosity is the force per unit area required to maintain a unit velocity gradient between two parallel layers of a fluid.

Stokes’ law states that the viscous force on a small sphere moving in a fluid is F = 6p?rv.

Terminal velocity is the constant maximum velocity attained by a body falling through a viscous fluid when net force becomes zero.

Terminal velocity is given by v = (2r²(? - s)g)/(9?).

Surface tension is the property of a liquid surface that makes it behave like a stretched elastic membrane.

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