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NCERT Solutions for class 11 Physics | Chapter 9 - Mechanical Properties of Solids

Questions
1 The reason for the change in shape of a regular body is
A volume stress
B shearing strain
C longitudinal strain
D metallic strain

Answer:volume stress
2 After terminal velocity is reached, the acceleration of a body falling through a fluid is
A zero
B equal to g
C less than g
D greater than g

Answer:zero
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3 Which of the following statements is/are wrong?

I. Hollow shaft is much stronger than a solid rod of same length and same mass.

II. Reciprocal of bulk modulus of elasticity is called compressibility.

III. It is difficult to twist a long rod as compared to small rod.

A III only
B I only
C II and III
D I and II

Answer:III only
4 Terminal velocity of ball depends on
A density difference of liquid and ball
B density of ball only
C density of liquid only
D area of the ball

Answer:density difference of liquid and ball
5 If a soap bubble formed at the end of the tube is blown very slowly, then the graph between excess pressure inside the bubble with time will be a
A parabolic curve sloping down
B parabolic curve sloping up
C straight line sloping down
D straight line sloping up

Answer:parabolic curve sloping down
6 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

Answer:7.5 × 10-2 J
7 Shearing strain is given by
A Deforming force
B Shape of shear
C Angle of shear
D Change in volume of the body

Answer:Angle of shear
8 If a wire having initial diameter of 2 mm produced the longitudinal strain of 0.1%, then the final diameter of wire will be (s = 0.5)
A 2.002 mm
B 1.998 mm
C 1.999 mm
D 2.001 mm

Answer:1.999 mm
9 Under the action of load F1, the length of a string is L1 and that under F2, is L2. the original length of the wire is
A [L1F1 - L2F2] / [F1 + F2]
B [L1F2 - L2F1] / [F1 - F2]
C [L1F2 - L2F1] / [F2 - F1]
D [L1F2 - L2F1] / [F1 + F2]

Answer:[L1F2 - L2F1] / [F2 - F1]
10 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

Answer:4 mm2
11 The compressibility of water is 4 × 10-5 per unit atmospheric pressure. 100cc of water is subjected to a change of pressure of 100 atmospheres. The change in the volume will be
A 4 × 10-5 cc
B 4 × 10-2 cc
C 4 × 10-4 cc
D 4 ?×10-1 cc

Answer:4 ?×10-1 cc
12 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

Answer:1:4
13 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

Answer:Lateral strain
14 The Youngs modulus for a plastic body is
A One
B Zero
C Infinity
D Less then one

Answer:Zero
15 If by applying a force, the shape of a body is changed, then the corresponding stress is known as
A Tensile stress
B Bulk stress
C Shearing stress
D Compressive stress

Answer:Shearing stress
16 The force constant of a wire is K and that of another wire of the same material is 2K. when both the wires are stretched by the same force, then the work done is
A W2 = W1
B W2 = 0.5 W1
C W2 = 2W1
D W2 = 2W12

Answer:W2 = 0.5 W1
17 If a material is heated and annealed, then its elasticity is
A Increased
B Decreased
C Not change
D Becomes zero

Answer:Decreased
18 Four steel wires of the following dimensions are stretched with the same force. Which one of them will have the largest extension?
A L1 = 50 cm, r1 = 0.5 mm
B L2 = 100 cm, r2 = 1 mm
C L3 = 200 cm, r3 = 2 mm
D L4 = 300 cm, r4 = 3 mm

Answer:L1 = 50 cm, r1 = 0.5 mm
19 The Youngs modulus for a plastic body is
A One
B Zero
C Infinity
D Less then one

Answer:Zero
20 To compress a liquid by 10% of its original volume, the pressure required is 2 105 atmosphere. The bulk modulus of liquid is
A 2 x105 N/m2
B 2x 107 N/m2
C 2x 104 N/m2
D 2 x106 N/m2

Answer:2 x106 N/m2

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