MCQ Questions for Class 11 Physics Chapter 9 Mechanical Properties of Solids with Answers

Mechanical Properties of Solids Class 11 Physics MCQs Questions with Answers

Check the below NCERT MCQ Questions for Class 11 Physics Chapter 9 Mechanical Properties of Solids with Answers Pdf free download. MCQ Questions for Class 11 Physics with Answers were prepared based on the latest exam pattern. We have Provided Mechanical Properties of Solids Class 11 Physics MCQs Questions with Answers to help students understand the concept very well.

Class 11 Physics Chapter 9 Quiz

Class 11 Physics Chapter 9 MCQ Online Test

You can refer to NCERT Solutions for Class 11 Physics Chapter 9 Mechanical Properties of Solids to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Mechanical Properties of Solids Class 11 Physics MCQ online test

Q1.	The ratio of the change in dimension at right angles to the applied force to the initial dimension is known as
	A.Youngs modulus
	B.Poissions ratio
	C.Lateral strain
	D.Shearing strain

Ans: Lateral strain

Q2.	Hookes law essentially defines
	A.Stress
	B.Strain
	C.Yield point
	D.Elastic limit

Ans: Elastic limit

Q3.	Theoretical value of Poissions ratio lies between
	A.-1 to 0.5
	B.-1 to -2
	C.0.5 to 1
	D.None

Ans: -1 to 0.5

Q4.	A wire suspended vertically from one of its ends is stretched by attaching a weight of 100N to its lower end. What is the elastic potential energy stored in the wire, if the weight stretches the wire by 1.5 mm?
	A.5 × 10-2 J
	B.10-3 J
	C.2.5 × 10-3 J
	D.7.5 × 10-2 J

Ans: 7.5 × 10-2 J

Q5.	An iron bar of length l m and cross section A m² is pulled by a force of F Newton from both ends so as to produce and elongation in meters. Which of the following statement statements is correct
	A.Elongation is inversely proportional to length l
	B.Elongation is directly proportional to cross section A
	C.Elongation is inversely proportional to A
	D.Elongation is directly proportional to Youngs modulus

Ans: Elongation is inversely proportional to A

Q6.	Out of the following materials, whose elasticity is independent of temperature?
	A.Copper
	B.Invar steel
	C.Brass
	D.Silver

Ans: Invar steel

Q7.	Longitudinal strain is possible in the case of
	A.Gases
	B.Liquid
	C.Only solids
	D.Only gases & liquids

Ans: Only solids

Q8.	Two wires A and B are of the same length. The diameters are in the ratio 1 : 2 and the Youngs modulus are in ratio 2 : 1. if they are pulled by the same force, then their elongations will be in ratio
	A.4:1
	B.1:4
	C.1:2
	D.2:1

Ans: 2:1

Q9.	A body of mass 500 g is fastened to one end of a steel wire of length 2 m and area of cross-section 2 mm². if the breaking stress of he wire is 1.25 × 107 N/m², then the maximum angular velocity with which the body can be rotated in a horizontal circle is
	A.2 rad/s
	B.3 rad/s
	C.4 rad/s
	D.5 rad/s

Ans: 5 rad/s

Q10.	If a material is heated and annealed, then its elasticity is
	A.Increased
	B.Decreased
	C.Not change
	D.Becomes zero

Ans: Decreased

Q11.	A wire suspended vertically from one of its ends is stretched by attaching a weight of 100N to its lower end. What is the elastic potential energy stored in the wire, if the weight stretches the wire by 1.5 mm?
	A.5 × 10-2 J
	B.10-3 J
	C.2.5 × 10-3 J
	D.7.5 × 10-2 J

Ans: 7.5 × 10-2 J

Q12.	Out of the following materials, whose elasticity is independent of temperature?
	A.Copper
	B.Invar steel
	C.Brass
	D.Silver

Ans: Invar steel

Q13.	When impurities are added to an elastic substance, its elasticity
	A.Increases
	B.Decreases
	C.Becomes zero
	D.May increase or decrease

Ans: May increase or decrease

Q14.	A body of mass 1 kg is attached to one end of a wire and rotated in horizontal circle of diameter 40 cm with a constant speed of 2 m/s. what is the area of cross-section of the wire if the stress developed in the wire is 5 × 106 N/m²?
	A.2 mm²
	B.3 mm²
	C.4 mm²
	D.5 mm²

Ans: 4 mm²

Q15.	The ratio of the change in dimension at right angles to the applied force to the initial dimension is known as
	A.Youngs modulus
	B.Poissions ratio
	C.Lateral strain
	D.Shearing strain

Ans: Lateral strain

Q16.	What is the energy stored per unit volume in a copper wire, which produces longitudinal strain of 0.1%. [Y = 1.1 × 1011 N/m²]
	A.11 × 103 J/m³
	B.5.5 × 103 J/m³
	C.11 × 104 J/m³
	D.5.5 × 104 J/m³

Ans: 5.5 × 104 J/m³

Q17.	The following four wires of length L and the radius r are made of same material. Which of these will have the largest extension when the same tension is applied.
	A.L = 50 cm, r = 0.25 mm
	B.L = 100 cm, r = 0.5 mm
	C.L = 200 cm, r = 1 mm
	D.L = 3000 cm, r = 1.5 mm