10 MCQS from chapter fluid dynamics of 11th class physics Fedral board of islamabad
10 MCQS from chapter fluid dynamics of 11th class physics Fedral board of islamabad
Below are 10 Multiple Choice Questions (MCQs) with answers and brief explanations, specifically from Chapter 6: Fluid Dynamics of the FBISE (Federal Board of Intermediate and Secondary Education) 11th-class Physics syllabus for the 2025 exam. These MCQs are designed to align with the FBISE syllabus, focusing on key concepts such as streamline and turbulent flow, Bernoulli’s equation, equation of continuity, viscosity, and Stokes’ law, as outlined in the official curriculum and reflected in past papers and resources like www.taleemcity.com and www.ilmistarsacademy.com. They are crafted to match the style and difficulty level of FBISE exams.
Chapter 6: Fluid Dynamics - Key Topics
- Types of Fluid Flow: Streamline (laminar) and turbulent flow.
- Equation of Continuity: Conservation of mass in fluid flow.
- Bernoulli’s Equation: Conservation of energy in fluid flow.
- Viscosity: Coefficient of viscosity, Stokes’ law.
- Applications: Venturi meter, dynamic lift, Torricelli’s theorem.
10 MCQs with Answers and Explanations
- Question: In streamline flow, the path of fluid particles is:
- A) Random
- B) Circular
- C) Parallel and smooth
- D) Zigzag
- Answer: C) Parallel and smooth
- Explanation: Streamline flow is characterized by smooth, parallel paths of fluid particles, with no mixing between layers.
- Question: The equation of continuity is based on the conservation of:
- A) Energy
- B) Momentum
- C) Mass
- D) Charge
- Answer: C) Mass
- Explanation: The equation of continuity (A₁v₁ = A₂v₂) ensures that the mass flow rate is constant in an incompressible fluid.
- Question: Bernoulli’s equation is a statement of:
- A) Conservation of mass
- B) Conservation of energy
- C) Conservation of momentum
- D) Conservation of volume
- Answer: B) Conservation of energy
- Explanation: Bernoulli’s equation relates pressure, kinetic, and potential energy per unit volume, reflecting energy conservation in fluid flow.
- Question: The SI unit of the coefficient of viscosity is:
- A) N·m/s
- B) N·s/m²
- C) kg/m·s
- D) N/m²
- Answer: B) N·s/m²
- Explanation: Viscosity (η) is measured in pascal-second (Pa·s), equivalent to N·s/m², derived from the formula F = ηA(dv/dx).
- Question: A fluid flows through a pipe of varying cross-section. If the cross-sectional area decreases, the speed of the fluid:
- A) Decreases
- B) Increases
- C) Remains constant
- D) Becomes zero
- Answer: B) Increases
- Explanation: By the equation of continuity (A₁v₁ = A₂v₂), if area (A) decreases, velocity (v) increases to maintain constant mass flow.
- Question: According to Stokes’ law, the terminal velocity of a sphere falling through a viscous fluid is proportional to:
- A) Radius
- B) Square of radius
- C) Inverse of radius
- D) Cube of radius
- Answer: B) Square of radius
- Explanation: Stokes’ law gives terminal velocity v = (2r²(ρ - σ)g)/(9η), where v ∝ r² (r is the radius of the sphere).
- Question: The dynamic lift on an airplane wing is explained by:
- A) Equation of continuity
- B) Bernoulli’s principle
- C) Stokes’ law
- D) Torricelli’s theorem
- Answer: B) Bernoulli’s principle
- Explanation: Faster airflow over the wing reduces pressure (Bernoulli’s principle), creating lift due to the pressure difference.
- Question: In a Venturi meter, the pressure is minimum where the:
- A) Pipe is widest
- B) Pipe is narrowest
- C) Fluid is stationary
- D) Flow is turbulent
- Answer: B) Pipe is narrowest
- Explanation: By Bernoulli’s principle, where the pipe is narrowest, the fluid speed is highest, and pressure is lowest.
- Question: The terminal velocity of a small sphere falling in a viscous fluid depends on:
- A) Only the viscosity of the fluid
- B) Only the radius of the sphere
- C) Both viscosity and radius
- D) Neither viscosity nor radius
- Answer: C) Both viscosity and radius
- Explanation: Terminal velocity (Stokes’ law) depends on the sphere’s radius (r²), fluid viscosity (η), and density differences.
- Question: Torricelli’s theorem states that the speed of efflux from a hole in a tank is equal to:
- A) √(2gh)
- B) √(gh)
- C) 2gh
- D) gh
- Answer: A) √(2gh)
- Explanation: Torricelli’s theorem gives the speed of fluid exiting a hole at depth h as v = √(2gh), derived from Bernoulli’s principle.
Key Notes
- Syllabus Alignment: These MCQs cover core topics from Chapter 6 (Fluid Dynamics) of the FBISE 11th-class Physics syllabus, including Bernoulli’s equation, equation of continuity, viscosity, and applications like Venturi meter and Stokes’ law, which are frequently tested in exams.
- Question Variety: The questions include conceptual, theoretical, and application-based MCQs to reflect FBISE’s exam pattern, with emphasis on fluid flow principles.
- Explanations: Brief explanations clarify the reasoning, aiding quick understanding and revision.
Recommended Resources for Additional MCQs
For more MCQs on Chapter 6 (Fluid Dynamics):
- FBISE Official Website (www.fbise.edu.pk):
- Access past papers (2016–2024) under “Examinations” > “Past Papers.” Chapter 6 MCQs appear in the objective section.
- Taleem City (www.taleemcity.com):
- Offers solved MCQs for Chapter 6 in PDF format, tailored for FBISE syllabus.
- Ilmi Stars Academy (www.ilmistarsacademy.com):
- Provides chapter-specific MCQs with answers and video explanations.
- Download Class Notes (www.downloadclassnotes.com):
- Contains solved MCQs for Fluid Dynamics in downloadable PDFs.
- Pak Learning Spot (www.paklearningspot.com):
- Features free MCQs for FBISE board exams, including Chapter 6.
How to Access:
- Visit these websites, navigate to the 11th-class Physics section, and select “Chapter 6 MCQs” or “Fluid Dynamics.”
- Past papers are available on the FBISE website in PDF format, free of charge.
Tips for MCQ Preparation
- Focused Practice: Solve 10–15 MCQs daily for Chapter 6 to master concepts like Bernoulli’s principle and Stokes’ law.
- Time Yourself: Aim for ~1 minute per MCQ to build exam speed.
- Review Errors: Use answer keys to understand mistakes and revisit concepts like the equation of continuity.
- Combine with Numericals: Pair MCQ practice with numerical problems (e.g., terminal velocity, Bernoulli’s equation) from the FBISE textbook (available on www.taleem360.com).
Additional Support
These 10 MCQs are tailored to support your preparation for the 2025 FBISE exam. If you need:
- More MCQs for Chapter 6 (Fluid Dynamics).
- MCQs for other chapters or specific topics (e.g., Bernoulli’s equation, viscosity).
- Assistance downloading resources or solving numericals. please let me know, and I’ll provide further tailored support. Good luck with your Physics exam preparation!
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