CBSE Class 11 Physics Chapter 9 Mechanical Properties of Solids Multiple Choice Questions with Answers. MCQ Questions Class 11 Physics Mechanical Properties of Solids with Answers was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 11 Physics Mechanical Properties of Solids MCQs with Answers to know their preparation level.
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MCQ Questions Class 11 Physics Mechanical Properties of Solids with Answers - Set - 4
Question 1:
The length of an iron wire is L and area of corss-section is A. The increase in length is l on applying the force F on its two ends. Which of the statement is correct?
(a) Increase in length is inversely proportional to its length
(b) Increase in length is proportional to area of crosssection
(c) Increase in length is inversely proportional to area of cross-section
(d) Increase in length is proportional to Young’s modulus
Correct Answer – (C)
Question 2 :
Which one of the following affects the elasticity of a substance ?
(a) Change in temperature
(b) Hammering and annealing
(c) Impurity in substance
(d) All of the above
Correct Answer – (D)
Question 3 :
The Young’s modulus of brass and steel are respectively 1010 N/m2. and 2 × 1010 N/m2. A brass wire and a steel wire of the same length are extended by 1 mm under the same force, the radii of brass and steel wires are RB and RS respectively. Then
(a) RS = √2 RB
(b) RS = RB /√2
(c) RS = 4RB
(d) RS = RB / 4
Correct Answer – (B)
Question 4 :
Two wires of same material and length but cross-sections in the ratio 1 : 2 are used to suspend the same loads. The extensions in them will be in the ratio
(a) 1 : 2
(b) 2 : 1
(c) 4 : 1
(d) 1 : 4
Correct Answer – (B)
Question 5 :
What per cent of length of wire increases by applying a stress of 1 kg weight/mm2 on it?
(Y = 1 × 1011 N/m2 and 1 kg weight = 9.8 newton)
(a) 0.0067%
(b) 0.0098%
(c) 0.0088%
(d) 0.0078%
Correct Answer – (B)
MCQ Questions Class 11 Physics Mechanical Properties of Solids with Answers
Question 6 :
According to Hooke’s law of elasticity, if stress is increased, then the ratio of stress to strain
(a) becomes zero
(b) remains constant
(c) decreases
(d) increases
Correct Answer – (B)
Question 7 :
Uniform rod of mass m, length l , area of cross-section A has Young’s modulus Y. If it is hanged vertically, elongation under its own weight will be
(a) mgl /2AY
(b) 2mgl /AY
(c) mgl /AY
(d) mgY/Al
Correct Answer – (C)
Question 8 :
A body of mass 10 kg is attached to a wire of radius 3 cm. It’s breaking stress is 4.8 × 107 Nm–2, the area of cross-section of the wire is 10–6 m2. What is the maximum angular velocity with which it can be rotated in the horizontal circle ?
(a) 1 rad sec–1
(b) 2 rad sec–1
(c) 4 rad sec–1
(d) 8 rad sec–1
Correct Answer – (C)
Question 9 :
K is the force constant of a spring. The work done in increasing its extension from l1 to l2 will be
(a) K(l2 – l1)
(b) K/2(l2 + l1)
(c) K(l22 – l12)
(d) K/2(l22 + l12)
Correct Answer – (D)
Question 10 :
When a pressure of 100 atmosphere is applied on a spherical ball, then its volume reduces to 0.01%. The bulk modulus of the material of the rubber in dyne/cm2 is
(a) 10 × 1012
(b) 100 × 1012
(c) 1 × 1012
(d) 10 × 1012
Correct Answer – (C)
- NCERT Solutions Class 11 Physics Chapter 1 : Physical world
- NCERT Solutions Class 11 Physics Chapter 2 : Units And Measurements
- NCERT Solutions Class 11 Physics Chapter 3 : Motion In A Straight Line
- NCERT Solutions Class 11 Physics Chapter 4 : Motion In A Plane
- NCERT Solutions Class 11 Physics Chapter 5 : Laws of Motion
- NCERT Solutions Class 11 Physics Chapter 6 : Work Energy Power
- NCERT Solutions Class 11 Physics Chapter 7 : Rotational-Motion
- NCERT Solutions Class 11 Physics Chapter 8 : Gravitation
- NCERT Solutions Class 11 Physics Chapter 9 : Mechanical Properties of Solids
- NCERT Solutions Class 11 Physics Chapter 10 : Mechanical Properties of Fluids
- NCERT Solutions Class 11 Physics Chapter 11 : Thermal Properties of Matter
- NCERT Solutions Class 11 Physics Chapter 12 : Thermodynamics
- NCERT Solutions Class 11 Physics Chapter 13 : Kinetic Theory
- NCERT Solutions Class 11 Physics Chapter 14 : Oscillations
- NCERT Solutions Class 11 Physics Chapter 15 : Waves
