Mechanical Properties of Solids MCQs for NEET

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

View Answer

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

View Answer

Answer:zero

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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]

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer:Lateral strain

14 The Youngs modulus for a plastic body is

A One

B Zero

C Infinity

D Less then one

View Answer

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

View Answer

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

View Answer