# Unseen Passage

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# Mechanical Properties of Solids MCQ Class 11 Physics

Please refer to Chapter 10 Mechanical Properties of Solids MCQ Class 11 Physics with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 11 Physics. Students should refer to MCQ Questions for Class 11 Physics with Answers to score more marks in Grade 11 Physics exams. Students should read the chapter Mechanical Properties of Solids and then attempt the following objective questions.

## MCQ Questions Class 11 Physics Chapter 10 Mechanical Properties of Solids

The Mechanical Properties of Solids MCQ Class 11 Physics provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. Hookes law essentially defines
(a) Stress
(b) Strain
(c) Yield point
(d) Elastic limit

D

Question. Longitudinal strain is possible in the case of
(a) Gases
(b) Liquid
(c) Only solids
(d) Only gases & liquids

C

Question. A body of mass 500 g is fastened to one end of a steel wire of length 2 m and area of crosssection 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

D

Question. If a material is heated and annealed, then its elasticity is
(a) Increased
(b) Decreased
(c) Not change
(d) Becomes zero

B

Question. The change in the shape of a regular boy is due to
(a) Bulk strain
(b) Shearing strain
(c) Longitudinal strain
(d) Volume strain

B

Question. 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

C

Question. 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

D

Question. Theoretical value of Poissions ratio lies between
(a) -1 to 0.5
(b) -1 to -2
(c) 0.5 to 1
(d) None

A

Question. The modulus of elasticity is dimensionally equivalent to
(a) Strain
(b) Stress
(c) Surface tension
(d) Poissions ratio

B

Question. When impurities are added to an elastic substance, its elasticity
(a) Increases
(b) Decreases
(c) Becomes zero
(d) May increase or decrease

D

Question. 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

C

Question. 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

D

Question. 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

C

Question. Out of the following materials, whose elasticity is independent of temperature?
(a) Copper
(b) Invar steel
(c) Brass
(d) Silver

B

Question. 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

D

Question. 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