Last Updated on June 5, 2025 by XAM CONTENT
Mastering the important concepts in Class 11 Physics Chapter 9 – Mechanical Properties of Fluids is essential for scoring high marks in your exams. That’s why we’ve put together chapterwise multiple-choice questions (MCQs) with answers to help you revise effectively and boost your confidence. It is a part of MCQ Questions for CBSE Class 11 Physics Series.
These multiple-choice questions will help you assess your knowledge, improve accuracy, and boost confidence for your exams. Whether you are preparing for school tests, online tests or competitive exams, these Mechanical Properties of Fluids MCQs will strengthen your conceptual clarity.
| Chapter | Mechanical Properties of Fluids |
| Book | Physics for Class 11 |
| Type of Questions | MCQ 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 MCQ Questions |
MCQ Questions on Mechanical Properties of Fluids Class 11 Physics (PDF Download)
MCQs
Q1. When depth is increased in a fluid, the pressure:
(a) Decreases linearly
(b) Remains constant
(c) Increases linearly
(d) Increases exponentially
Show Answer
Answer: (c)
Explanation: Pressure in a fluid increases linearly with depth: P = Pa + ρgh.
Q2. A U-tube contains two different fluids in equilibrium. The pressure at the bottom of the tube:
(a) Depends on the denser fluid only
(b) Is the same from both sides
(c) Is higher on the lighter side
(d) Is unequal from both sides
Show Answer
Answer: (b)
Explanation: At equilibrium, pressure at the same horizontal level in both limbs is equal.
Q3. Bernoulli’s equation is valid for:
(a) Incompressible viscous flow
(b) Compressible inviscid flow
(c) Incompressible non-viscous flow
(d) Steady compressible flow
Show Answer
Answer: (c)
Explanation: Bernoulli’s equation assumes steady, incompressible and non-viscous flow.
Q4. The pressure difference across a soap bubble of radius r is:
(a) S/r
(b) 2S/r
(c) 3S/r
(d) 4S/r
Show Answer
Answer: (d)
Explanation: For a soap bubble with two surfaces, excess pressure = 4S/r.
Q5. In a capillary tube, water rises due to:
(a) Density
(b) Viscosity
(c) Surface tension
(d) Adhesion only
Show Answer
Answer: (c)
Explanation: Capillary rise is due to surface tension acting at the liquid-solid interface.
Q6. The unit of coefficient of viscosity is:
(a) N·s/m
(b) N·m/s
(c) N·s/m²
(d) N/m²
Show Answer
Answer: (c)
Explanation: Viscosity η has units of stress divided by strain rate → N·s/m².
Q7. Terminal velocity of a sphere falling through a viscous fluid varies with radius as:
(a) r
(b) r²
(c) r³
(d) r⁴
Show Answer
Answer: (b)
Explanation: Terminal velocity vt = 2a²(ρ−σ)g / (9η), where a = radius.
Q8. The velocity profile in laminar flow through a pipe is:
(a) Uniform
(b) Parabolic
(c) Triangular
(d) Linear
Show Answer
Answer: (b)
Explanation: In laminar flow, the velocity profile across pipe cross-section is parabolic.
Q9. Bernoulli’s theorem is a consequence of:
(a) Newton’s third law
(b) Conservation of mass
(c) Conservation of energy
(d) Conservation of momentum
Show Answer
Answer: (c)
Explanation: Bernoulli’s principle applies conservation of mechanical energy to fluid flow.
Q10. Pressure at a depth h in a liquid of density ρ is:
(a) ρgh
(b) –ρgh
(c) h/ρg
(d) ρ/hg
Show Answer
Answer: (a)
Explanation: P = Pa + ρgh; for gauge pressure we use only ρgh.
Q11. The surface tension of a liquid is numerically equal to:
(a) Energy per unit mass
(b) Force per unit length
(c) Pressure per unit length
(d) Energy per unit volume
Show Answer
Answer: (b)
Explanation: Surface tension is defined as force per unit length or energy per unit area.
Q12. According to Stokes’ law, viscous force is proportional to:
(a) Radius
(b) Velocity squared
(c) Surface area
(d) Velocity
Show Answer
Answer: (d)
Explanation: Viscous force F = 6πηav; directly proportional to velocity.
Q13. A ball falls through a fluid. Its acceleration decreases due to:
(a) Buoyant force
(b) Surface tension
(c) Viscous drag
(d) Friction with air only
Show Answer
Answer: (c)
Explanation: Viscous drag opposes motion and reduces net acceleration.
Q14. The rise of a liquid in a capillary tube is inversely proportional to:
(a) Radius
(b) Area
(c) Square of radius
(d) Volume
Show Answer
Answer: (a)
Explanation: h = 2S cosθ / (ρga); rise is inversely proportional to radius.
Q15. A fluid flows faster through a narrow pipe due to:
(a) Gravity
(b) Bernoulli’s principle
(c) Surface tension
(d) Viscosity
Show Answer
Answer: (b)
Explanation: Bernoulli’s equation explains higher velocity at narrower cross-sections.
Q16. Turbulent flow occurs when the velocity of fluid exceeds:
(a) Critical velocity
(b) Terminal velocity
(c) Mean velocity
(d) Average pressure
Show Answer
Answer: (a)
Explanation: Above critical speed, fluid flow becomes chaotic and turbulent.
Q17. Pressure inside a soap bubble is greater than atmospheric pressure by:
(a) 2S/r
(b) 4S/r
(c) S/r
(d) 8S/r
Show Answer
Answer: (b)
Explanation: Soap bubble has two surfaces → excess pressure = 4S/r.
Q18. The angle of contact between liquid and solid is acute when:
(a) Adhesion < cohesion
(b) Adhesion = cohesion
(c) Adhesion > cohesion
(d) No relation
Show Answer
Answer: (c)
Explanation: When adhesion is more than cohesion, the liquid wets the surface → acute angle.
Q19. Which one of the following assumptions is not made in Bernoulli’s theorem?
(a) Fluid is incompressible
(b) Flow is rotational
(c) Fluid is non-viscous
(d) Flow is steady
Show Answer
Answer: (b)
Explanation: Bernoulli’s theorem assumes irrotational (not rotational) flow.
Q20. For a fluid at rest in a container, pressure is:
(a) Minimum at bottom
(b) Equal at all depths
(c) Maximum at surface
(d) Same at all points at same depth
Show Answer
Answer: (d)
Explanation: In static fluid, pressure is same at all points at the same horizontal level.
We hope the given mcq questions with Answers for Mechanical Properties of Fluids Class 11 helps you in your learning.
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Topics from which mcq questions may be asked
- Pressure in fluids
- Bernoulli’s principle
- Viscosity and surface tension
Fluids in motion explain everything from blood flow to aircraft lift.
Frequently Asked Questions (FAQs) on Mechanical Properties of Fluids MCQ Questions
Q1: What is the best way to prepare for Class 11 Physics MCQ questions?
A1: The best way is to study NCERT concepts thoroughly, practice topicwise MCQs regularly, and focus on understanding fundamental principles rather than rote learning. Solving previous year MCQs and mock tests can boost accuracy and speed.
Q2: Are NCERT questions enough for Class 11 Physics MCQ-based exams?
A2: NCERT forms the base for all CBSE Physics MCQs. However, for better preparation, students should solve additional MCQs from reference books and practice HOTS and competency-based questions to develop deeper conceptual clarity.
Q3: Where can I find chapterwise Class 11 Physics MCQ questions with answers?
A3: You can find chapterwise MCQ questions with answers and detailed explanations on trusted educational platforms like xamcontent.com and physicsgurukul.com. These cover both basic and advanced-level questions.
Q4: Do CBSE Class 11 exams include MCQs?
A4: Yes, as per the latest CBSE exam pattern, objective questions, including MCQs, are part of the final exam paper. MCQs test conceptual understanding and application skills.
Q5: How to score high in Class 11 Physics MCQs?
A5: To score high, understand the theory from NCERT, solve a variety of MCQs (basic, conceptual, numerical), and regularly revise formulas and diagrams. Avoid guesswork and focus on time management during tests.
Q6: What are competency-based MCQs in Class 11 Physics?
A6: Competency-based MCQs assess a student’s ability to apply concepts in real-life or unfamiliar scenarios. These questions go beyond textbook definitions and require logical reasoning and application of physics principles.
