Class 11 Physics MCQ Chapter 9 Mechanical Properties of Solids
Are you searching for Class 11 Physics MCQ Chapter 9 Mechanical Properties of Solids English Medium? Then this article is a valuable study resource for AHSEC Higher Secondary First Year students. Here, you will find important multiple-choice questions (MCQs) with answers that will help you prepare effectively for your Physics examinations.
The chapter Mechanical Properties of Solids explains how solid materials respond when external forces are applied to them. Students will learn about stress, strain, elasticity, Hooke’s Law, Young’s modulus, bulk modulus, shear modulus, and the elastic behavior of materials. These concepts are important for understanding the strength and deformation of solids used in engineering and everyday life.
The MCQs included in this article are prepared according to the latest AHSEC syllabus and examination pattern. They are designed to help students revise important concepts, strengthen their understanding, and practice exam-oriented objective questions. Regular practice can improve conceptual clarity and boost confidence before examinations.
Whether you are preparing for class tests, annual examinations, or the AHSEC HS First Year Final Examination, these MCQ solutions will help you master the chapter and achieve better results in Physics.
Part II
Class 11 Physics MCQ Chapter 9 Mechanical Properties of Solids
VSA & MCQs
I. Very Short Answer (VSA) Questions with Answers
Q. What is elasticity?
Ans: Elasticity is the property of a material to regain its original shape and size after removal of the deforming force.
Q. What is plasticity?
Ans: Plasticity is the property of a material to retain its deformed shape after removal of the force.
Q. Define stress.
Ans: Stress is the restoring force per unit area developed inside a body.
Q. What is strain?
Ans: Strain is the ratio of change in dimension to the original dimension.
Q. State Hooke’s law.
Ans: Within the elastic limit, stress is directly proportional to strain.
Q. What is Young’s modulus?
Ans: Young’s modulus is the ratio of longitudinal stress to longitudinal strain.
Q. What is bulk modulus?
Ans: Bulk modulus is the ratio of normal stress to volumetric strain.
Q. What is shear modulus?
Ans: Shear modulus is the ratio of shearing stress to shearing strain.
Q. What is the elastic limit?
Ans: The maximum stress up to which a body regains its original shape is called the elastic limit.
Q. What is tensile stress?
Ans: Tensile stress is the stress produced when a body is stretched.
Q. What is compressive stress?
Ans: Compressive stress is the stress produced when a body is compressed.
Q. What is shearing stress?
Ans: Stress acting tangentially to the surface is called shearing stress.
Q. What is volumetric strain?
Ans: The ratio of change in volume to original volume.
Q. What is Poisson’s ratio?
Ans: The ratio of lateral strain to longitudinal strain.
Q. What is the SI unit of stress?
Ans: Pascal (Pa).
Q. What is a perfectly elastic body?
Ans: A body that completely regains its original shape after deformation.
Q. What is deformation?
Ans: Change in shape or size of a body due to applied force.
Q. What is restoring force?
Ans: The internal force that opposes deformation.
Q. Which material is more elastic: rubber or steel?
Ans: Steel is more elastic than rubber.
Q. What is breaking stress?
Ans: The stress at which a material breaks.
Q. What happens when stress exceeds the elastic limit?
Ans: Permanent deformation occurs.
Multiple Choice Questions (MCQs)
Q. The SI unit of stress is:
(a) Newton
(b) Joule
(c) Pascal
(d) Watt
Ans: (c) Pascal
Q. Stress is defined as:
(a) Force × Area
(b) Force per unit area
(c) Area per unit force
(d) Force × Length
Ans: (b) Force per unit area
Q. Strain is a:
(a) Scalar quantity
(b) Vector quantity
(c) Tensor quantity
(d) Dimensional quantity
Ans: (a) Scalar quantity
Q. Hooke’s law is valid within:
(a) Breaking point
(b) Elastic limit
(c) Plastic region
(d) Yield point
Ans: (b) Elastic limit
Q. Young’s modulus relates:
(a) Volume stress and strain
(b) Shear stress and strain
(c) Longitudinal stress and strain
(d) Pressure and volume
Ans: (c) Longitudinal stress and strain
Q. Which of the following has no unit?
(a) Stress
(b) Strain
(c) Force
(d) Pressure
Ans: (b) Strain
Q. Which material is more elastic?
(a) Rubber
(b) Wax
(c) Steel
(d) Clay
Ans: (c) Steel
Q. Stress developed due to stretching is called:
(a) Shearing stress
(b) Bulk stress
(c) Tensile stress
(d) Compressive stress
Ans: (c) Tensile stress
Q. The ratio of stress to strain is called:
(a) Pressure
(b) Modulus of elasticity
(c) Density
(d) Momentum
Ans: (b) Modulus of elasticity
Q. Bulk modulus is related to:
(a) Change in shape
(b) Change in volume
(c) Change in length
(d) Change in velocity
Ans: (b) Change in volume
Q. The SI unit of Young’s modulus is:
(a) Pascal
(b) Joule
(c) Newton
(d) Watt
Ans: (a) Pascal
Q. Shearing stress changes the:
(a) Volume
(b) Shape
(c) Mass
(d) Density
Ans: (b) Shape
Q. A perfectly plastic body:
(a) Regains original shape fully
(b) Partially regains shape
(c) Does not regain original shape
(d) Breaks immediately
Ans: (c) Does not regain original shape
Q. The restoring force acts:
(a) Along deformation
(b) Opposite to deformation
(c) Perpendicular to deformation
(d) Randomly
Ans: (b) Opposite to deformation
Q. The strain produced by a change in volume is called:
(a) Longitudinal strain
(b) Shearing strain
(c) Volumetric strain
(d) Lateral strain
Ans: (c) Volumetric strain
Q. Which quantity is dimensionless?
(a) Stress
(b) Force
(c) Strain
(d) Pressure
Ans: (c) Strain
Q. Elasticity is due to:
(a) Molecular attraction
(b) Gravity
(c) Friction
(d) Magnetism
Ans: (a) Molecular attraction
Q. Which modulus is associated with liquids?
(a) Young’s modulus
(b) Shear modulus
(c) Bulk modulus
(d) Rigidity modulus
Ans: (c) Bulk modulus
Q. The stress at the breaking point is called:
(a) Elastic stress
(b) Tensile stress
(c) Breaking stress
(d) Shearing stress
Ans: (c) Breaking stress
Q. If stress is doubled within the elastic limit, strain becomes:
(a) Half
(b) Double
(c) Four times
(d) Zero
Ans: (b) Double
Q. Which force changes only the shape of a body?
(a) Tensile force
(b) Shearing force
(c) Compressive force
(d) Gravitational force
Ans: (b) Shearing force
Q. Poisson’s ratio is the ratio of:
(a) Stress to strain
(b) Lateral strain to longitudinal strain
(c) Force to area
(d) Volume to pressure
Ans: (b) Lateral strain to longitudinal strain
Q. The property of regaining original shape is called:
(a) Plasticity
(b) Elasticity
(c) Brittleness
(d) Ductility
Ans: (b) Elasticity
Q. Stress and pressure have:
(a) Different units
(b) Same units
(c) Different dimensions
(d) No dimensions
Ans: (b) Same units
Q. Which material can undergo large deformation?
(a) Steel
(b) Rubber
(c) Glass
(d) Iron
Ans: (b) Rubber
Q. Young’s modulus is maximum for:
(a) Rubber
(b) Steel
(c) Cotton
(d) Plastic
Ans: (b) Steel
Q. The graph between stress and strain within the elastic limit is:
(a) Curved
(b) Circular
(c) Straight line
(d) Parabolic
Ans: (c) Straight line
Q. The ability to bear stress without breaking is called:
(a) Elasticity
(b) Strength
(c) Plasticity
(d) Rigidity
Ans: (b) Strength
Q. Assertion (A): Hooke’s law is valid only within the elastic limit.
Reason (R): Beyond the elastic limit, stress is not proportional to strain.
(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): Steel is more elastic than rubber.
Reason (R): Steel has a greater Young’s modulus than rubber.
(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): Strain has no unit.
Reason (R): Strain is a ratio of two similar quantities.
(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): Stress and pressure have the same units.
Reason (R): Both are forces per unit area.
(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): Shearing stress changes the shape of a body.
Reason (R): Shearing force acts tangentially to the surface.
(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 perfectly elastic body regains its original shape completely.
Reason (R): No permanent deformation remains after removal of the force.
(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): Bulk modulus is important in liquids.
Reason (R): Liquids mainly resist change in volume.
(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.
