Class 11 Physics MCQ Chapter 10 Mechanical Properties of Fluids
Are you looking for Class 11 Physics MCQ Chapter 10 Mechanical Properties of Fluids English Medium? This article provides a collection of important multiple-choice questions (MCQs) with answers specially designed for AHSEC Higher Secondary First Year students.
The chapter Mechanical Properties of Fluids helps students understand the behavior of liquids and gases under different conditions. It covers important topics such as pressure, density, Pascal’s Law, Archimedes’ Principle, buoyancy, surface tension, viscosity, streamline flow, and Bernoulli’s Principle. These concepts explain many natural phenomena and have numerous practical applications in science and engineering.
The MCQs included here are prepared according to the latest AHSEC syllabus and examination pattern. They are useful for quick revision, concept strengthening, and exam preparation. By practicing these objective questions regularly, students can improve their understanding of fluid mechanics and become more confident in solving Physics problems.
Whether you are preparing for class tests, annual examinations, or the AHSEC HS First Year Final Examination, these MCQ solutions will help you revise the chapter effectively and achieve better results in Physics.
Part II
Class 11 Physics MCQ Chapter 10 Mechanical Properties of Fluids
VSA & MCQs
I. Very Short Answer (VSA) Questions with Answers
Q. What is a fluid?
Ans: A substance that can flow is called a fluid.
Q. What is pressure?
Ans: Pressure is the normal force acting per unit area.
Q. What is the SI unit of pressure?
Ans: Pascal (Pa).
Q. State Pascal’s law.
Ans: Pressure applied to an enclosed fluid is transmitted equally in all directions.
Q. What is atmospheric pressure?
Ans: The pressure exerted by the atmosphere on Earth’s surface.
Q. What is gauge pressure?
Ans: The excess pressure over atmospheric pressure.
Q. What is absolute pressure?
Ans: The total pressure is measured relative to vacuum.
Q. What is density?
Ans: Density is mass per unit volume.
Q. What is relative density?
Ans: The ratio of the density of a substance to the density of water.
Q. State Archimedes’ principle.
Ans: A body immersed in fluid experiences an upward buoyant force equal to the weight of the displaced fluid.
Q. What is buoyant force?
Ans: The upward force exerted by a fluid on an immersed body.
Q. What is buoyancy?
Ans: The tendency of a fluid to exert an upward force on immersed bodies.
Q. What is viscosity?
Ans: Viscosity is the property of a fluid that opposes flow.
Q. What is streamline flow?
Ans: Flow in which fluid particles move in smooth paths.
Q. What is turbulent flow?
Ans: Flow in which fluid particles move irregularly.
Q. State Bernoulli’s principle.
Ans: An increase in the speed of fluid decreases its pressure.
Q. What is surface tension?
Ans: Surface tension is the force acting along the surface of a liquid per unit length.
Q. What is capillarity?
Ans: The rise or fall of liquid in a narrow tube is called capillarity.
Q. What is the angle of contact?
Ans: The angle between the liquid surface and the solid surface at the point of contact.
Q. What is terminal velocity?
Ans: The constant maximum velocity attained by a body falling through a fluid.
Q. What is a hydraulic lift?
Ans: A device based on Pascal’s law used to lift heavy loads.
Q. What happens to pressure with an increase in depth in a liquid?
Ans: Pressure increases with depth.
Multiple Choice Questions (MCQs)
Q. The SI unit of pressure is:
(a) Newton
(b) Joule
(c) Pascal
(d) Watt
Ans: (c) Pascal
Q. Pressure is defined as:
(a) Force × Area
(b) Force per unit area
(c) Area per unit force
(d) Mass per unit area
Ans: (b) Force per unit area
Q. Which law is used in a hydraulic lift?
(a) Newton’s law
(b) Pascal’s law
(c) Archimedes’ principle
(d) Bernoulli’s theorem
Ans: (b) Pascal’s law
Q. The upward force exerted by a fluid is called:
(a) Viscous force
(b) Frictional force
(c) Buoyant force
(d) Magnetic force
Ans: (c) Buoyant force
Q. Archimedes’ principle deals with:
(a) Pressure
(b) Buoyancy
(c) Viscosity
(d) Surface tension
Ans: (b) Buoyancy
Q. Density is equal to:
(a) (mV)
(b) (m/V)
(c) (V/m)
(d) (m+V)
Ans: (b) (m/V)
Q. Bernoulli’s principle states that fluid pressure:
(a) Increases with speed
(b) Decreases with speed
(c) Remains constant
(d) Becomes zero
Ans: (b) Decreases with speed
Q. Streamline flow is also called:
(a) Turbulent flow
(b) Laminar flow
(c) Random flow
(d) Irregular flow
Ans: (b) Laminar flow
Q. Viscosity is the property of a fluid related to:
(a) Density
(b) Flow resistance
(c) Pressure increase
(d) Temperature decrease
Ans: (b) Flow resistance
Q. Surface tension acts:
(a) Perpendicular to the surface
(b) Along the liquid surface
(c) Downward only
(d) Upward only
Ans: (b) Along the liquid surface
Q. Capillary rise is due to:
(a) Gravity only
(b) Surface tension
(c) Pressure only
(d) Density only
Ans: (b) Surface tension
Q. Pressure in a liquid increases with:
(a) Height
(b) Depth
(c) Temperature
(d) Area
Ans: (b) Depth
Q. Which fluid has maximum viscosity?
(a) Water
(b) Honey
(c) Air
(d) Alcohol
Ans: (b) Honey
Q. The pressure exerted by liquids acts:
(a) Upward only
(b) Downward only
(c) In all directions
(d) Horizontally only
Ans: (c) In all directions
Q. Terminal velocity occurs when:
(a) Net force becomes zero
(b) Weight becomes zero
(c) Velocity becomes zero
(d) Pressure becomes maximum
Ans: (a) Net force becomes zero
Q. Which instrument measures atmospheric pressure?
(a) Thermometer
(b) Hygrometer
(c) Barometer
(d) Lactometer
Ans: (c) Barometer
Q. A body floats when:
(a) The density of the body is greater than that of the fluid
(b) The density of the body is less than that of the fluid
(c) Weight is zero
(d) Mass is zero
Ans: (b) The density of the body is less than that of the fluid
Q. Surface tension decreases with an increase in:
(a) Area
(b) Volume
(c) Temperature
(d) Pressure
Ans: (c) Temperature
Q. Which phenomenon explains the rise of kerosene in the lamp wick?
(a) Viscosity
(b) Capillarity
(c) Buoyancy
(d) Turbulence
Ans: (b) Capillarity
Q. The force responsible for surface tension is:
(a) Gravitational force
(b) Cohesive force
(c) Magnetic force
(d) Electrostatic force
Ans: (b) Cohesive force
Q. In Bernoulli’s theorem, the sum of pressure energy, kinetic energy, and potential energy remains:
(a) Zero
(b) Variable
(c) Constant
(d) Infinite
Ans: (c) Constant
Q. A ship floats because:
(a) Its density is high
(b) Buoyant force balances its weight
(c) Water density decreases
(d) It has no weight
Ans: (b) Buoyant force balances its weight
Q. Which flow is irregular?
(a) Laminar flow
(b) Streamline flow
(c) Turbulent flow
(d) Uniform flow
Ans: (c) Turbulent flow
Q. Hydraulic brakes work on:
(a) Bernoulli’s theorem
(b) Pascal’s law
(c) Archimedes’ principle
(d) Hooke’s law
Ans: (b) Pascal’s law
Q. The tendency of a liquid surface to contract is due to:
(a) Pressure
(b) Viscosity
(c) Surface tension
(d) Density
Ans: (c) Surface tension
Q. The SI unit of viscosity coefficient is:
(a) Pa s
(b) N/m
(c) kg/m(^3)
(d) Joule
Ans: (a) Pa s
Q. Assertion (A): Pressure in a liquid increases with depth.
Reason (R): The weight of the liquid column increases with depth.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false, but R is true.
Ans: (a) Both A and R are true, and R is the correct explanation of A.
Q. Assertion (A): Hydraulic lifts work on Pascal’s law.
Reason (R): Pressure applied to enclosed fluid is transmitted equally.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false, but R is true.
Ans: (a) Both A and R are true, and R is the correct explanation of A.
Q. Assertion (A): A ship made of iron can float on water.
Reason (R): The average density of the ship is less than that of water.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false, but R is true.
Ans: (a) Both A and R are true, and R is the correct explanation of A.
Q. Assertion (A): Surface tension decreases with an increase in temperature.
Reason (R): The cohesive force between liquid molecules decreases with temperature.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false, but R is true.
Ans: (a) Both A and R are true, and R is the correct explanation of A.
Q. Assertion (A): Bernoulli’s principle explains the lift of airplane wings.
Reason (R): Fast-moving air has lower pressure.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false, but R is true.
Ans: (a) Both A and R are true, and R is the correct explanation of A.
Q. Assertion (A): Relative density has no unit.
Reason (R): It is a ratio of two densities.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false, but R is true.
Ans: (a) Both A and R are true, and R is the correct explanation of A.
Q. Assertion (A): Streamline flow is smooth and regular.
Reason (R): Fluid particles move in fixed paths without mixing.
(a) Both A and R are true, and R is the correct explanation of A.
(b) Both A and R are true, but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false, but R is true.
Ans: (a) Both A and R are true, and R is the correct explanation of A.
