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Free download in PDF Class 11 Physics Chapter 9 Mechanical Properties of Solids Multiple Choice Questions and Answers for Board, JEE, NEET, AIIMS, JIPMER, IIT-JEE, AIEE and other competitive exams. MCQ Questions for Class 11 Physics with Answers were prepared based on the latest exam pattern. These short solved questions or quizzes are provided by Gkseries. These will help the students for preparation of their examination./p>
(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
(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
(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
(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
(7)
Shearing strain is given by
[A]
Deforming force
[B]
Shape of shear
[C]
Angle of shear
[D]
Change in volume of the body
(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
(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
(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
(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
(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
(14)
The Youngs modulus for a plastic body is
[A]
One
[B]
Zero
[C]
Infinity
[D]
Less then one
(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
(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
(17)
If a material is heated and annealed, then its elasticity is
[A]
Increased
[B]
Decreased
[C]
Not change
[D]
Becomes zero
(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
(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
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