MCQ Questions for Class 11 Physics Chapter 9 Mechanical Properties of Solids 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. https://mcqquestions.guru/mcq-questions-for-class-11-physics-chapter-9/

Mechanical Properties of Solids Class 11 MCQs Questions with Answers

Mechanical Properties Of Solids MCQ Question 1.
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

Mechanical Properties Of Solids Class 11 MCQ Question 2.
In a wire, when elongation is 2 cm energy stored is E. if it is stretched by 10 cm, then the energy stored will be
(a) E
(b) 2 E
(c) 4 E
(d) 25 E

MCQ On Mechanical Properties Of Solids Question 3.
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

Mechanical Properties Of Solids MCQ Pdf Question 4.
Hookes law essentially defines
(a) Stress
(b) Strain
(c) Yield point
(d) Elastic limit

MCQ On Mechanical Properties Of Solids Class 11 Question 5.
Longitudinal strain is possible in the case of
(a) Gases
(b) Liquid
(c) Only solids
(d) Only gases & liquids

Class 11 Physics Chapter 9 MCQ Question 6.
Two wires have the same material and length, but their masses are in the ration of 4 : 3. If they are stretched by the same force, their elongations will be in the ratio of
(a) 2 : 3
(b) 3 : 4
(c) 4 : 3
(d) 9 : 16

Mechanical Properties Of Solid MCQ Question 7.
A rubber cord of cross sectional area 1 mm² and unstretched length 10 cm is stretched to 12 cm and then released to project a stone of mass 5 gram. If Y for rubber = 5 ? 108N/m², then the tension in the rubber cord is
(a) 25 N
(b) 50 N
(c) 100 N
(d) 200 N

MCQ Questions On Mechanical Properties Of Solids Question 8.
Out of the following materials, whose elasticity is independent of temperature?
(a) Copper
(b) Invar steel
(c) Brass
(d) Silver

MCQs On Mechanical Properties Of Solids Question 9.
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

Answer: (c) Elongation is inversely proportional to A

Mechanical Properties Of Solids MCQs Question 10.
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) Poissons ratio
(c) Lateral strain
(d) Shearing strain

Class 11 Physics Chapter 9 MCQs Question 11.
Four wires whose lengths and diameter respectively are given below are made of the same material. Which of these will have the largest extension when same tension is applied?
(a) 0.50 m, 0.50 mm
(b) 1.00 mm, 1.00 mm
(c) 2.00 m, 2.00 mm
(d) 4.00 m, 4.00 mm

Answer: (a) 0.50 m, 0.50 mm

MCQ On Elasticity Class 11 Question 12.
When the intermolecular distance increases due to tensile force, then
(a) There is no force between the molecules
(b) There is a repulsive force between the molecules
(c) There is an attractive force between the molecules
(d) There is zero resultant force between the molecules

Answer: (c) There is an attractive force between the molecules

Class 11 Mechanical Properties Of Solids MCQ Question 13.
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

MCQ Of Mechanical Properties Of Solids Question 14.
One end of a steel wire of area of cross-section 3 mm² is attached to the ceiling of an elevator moving up with an acceleration of 2.2 m/s². if a load of 8 kg is attached at its free end, then the stress developed in the wire will be
(a) 8 × 106 N/m²
(b) 16 × 106 N/m²
(c) 20 × 106 N/m²
(d) 32 × 106 N/m²

Answer: (d) 32 × 106 N/m²

Class 11 Physics Mechanical Properties Of Solids MCQs Question 15.
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) Poissons ratio
(c) Lateral strain
(d) Shearing strain

MCQ Questions For Class 11 Physics Chapter 9 Question 16.
The magnitude of the force developed by raising the temperature from 0°C to 100°C of the iron bar of 1.00 m long and 1 cm² cross-section when it is held so that it is not permitted to expand or bend is (a = 10-5/oC and Y = 1011 N/m²)
(a) 103 N
(b) 104 N
(c) 105
(d) 109 N

Chapter 9 Physics Class 11 MCQs Question 17.
The upper end of wire 1 m long and 2 mm radius is clamped. The lower end is twisted through an angle of 45°. The angle of shear is
(a) 0.09°
(b) 0.9°
(c) 9°
(d) 90°

Mechanical Properties Of Solids MCQ Questions Question 18.
The radii of two wires of a same material are in ratio 2 : 1. if the wires are stretched by equal forces, the stress produced in them will be
(a) 2 : 1
(b) 4 : 1
(c) 1 : 4
(d) 1 : 2

Class 11 Physics Mechanical Properties Of Solids MCQ Question 19.
A rubber cord of cross sectional area 1 mm² and unstretched length 10 cm is stretched to 12 cm and then released to project a stone of mass 5 gram. If Y for rubber = 5 ? 108N/m², then the tension in the rubber cord is
(a) 25 N
(b) 50 N
(c) 100 N
(d) 200 N

Class 11 Physics Ch 9 MCQ Question 20.
In a wire, when elongation is 2 cm energy stored is E. if it is stretched by 10 cm, then the energy stored will be
(a) E
(b) 2 E
(c) 4 E
(d) 25 E