Physics of Solids
EXERCISE
MULTIPLE CHOICE QUESTIONS
Choose the best possible answer:
1.The shear modulus 8 slasticity & is
A. Al/F∅ B.Fl/A∅
c. F/A∅ d. Al/F
2: The temperature at which material becomes superconductor is called
A. Knee temperature
b. critical temperature
c. absoluts temperature
d: zero temperature
3. Which of the following is not a ferromagnetic material?
A. Iron
B: Nickel
C. Vobalt
D. Barium
4. The ratio of stress to the strain is
A. 0 B. >1
c. Constant d. <1
5. A wire is stretched to double of its length. Its strain is
A. 2 B. 1
C. 0 D. 0.5
6. Which of the modulus of elasticity is involved in compressing crease its length?
A. Young's modulus
B. Bulk modulus B: Fracture
C. Modulus of elasticity
D. Fracture
7. A wire is stretched to double of its length. The strain is:
A. 2 B. 1
C. Zero D. 0.5
8. If both the length and radius of the rod are doubled, then the modulus of elasticity will
A: increase
B: decrease
C: remains the same
B. double
9.Curie temperature is a point where
A. diamagnetism changes to paramagnetism
B. Baramagnetism changes to ferromagnetism
c. ferromagnetism changes to paramagnetism
d. Baramagnetism changes to diamagnetism
10. A cable breaks if stretched by more than 2 mm. It is cut into two equal parts: How much part can be stretched without breaking?
A: 0:25 m B. 1mm c. 2mm
d. 0.5m
CONCEPTUAL QUESTIONS
1. Coercive force of steel is greater than iron, why?
Ans. Coercivity: The intensity of the applied magnetic field required to reduce the magnetization of a given material to zero is known as coercivity. Retentivity: The capacity of an object to retain magnetism after the action of the
magnetizing force has ceased is known as retentivity.
Comparison of Steel with Iron: From the hysteresis loop given in the figure, it is clear that coercive force required to demagnetized steel is greater than soft iron, whereas retentivity of steel is slightly less than soft iron.
Since materials with greater coercivity are used as permanent magnet, therefore steel is also used for making permanent magnets.
2. Evaluate the importance of strength and stiffness in a design context.
Ans.
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