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41. Materials that undergo plastic deformation before breaking are called __________________?
A. Brittle
B. Ductile
C. Amorphous
D. Polymers
42. A wire obeys Hooks law is of length 11 when it is in equilibrium under a tension F1. Its length becomes 12 when the tension is increased to F2. The energy stored in the wire during this process is____________________?
A. (F1+F2) (121+122)
B. (F1+F2) (122-112)
C. (F1+F2) (12-11)
D. (F1+F2) (12-11)
43. Any alteration produced in shapes length or volume when a body is subjected to some external force is called____________________?
A. Stiffness
B. Toughness
C. Extension
D. Deformation
44. The curie temperature is that at which ____________________?
A. Semi-conductor becomes conductors
B. Ferromagnetic becomes paramagnetic
C. Paramagnetic becomes diamagnetic
D. Metals become super conductor
45. Coercive force is the force which opposes ____________________?
A. Demagnetization
B. Breakage
C. Extension
D. Surface cracking
46. The bulk properties of materials such as their mode of fracture can be related to their____________________?
A. Polymerization
B. Cleavage
C. Microstructure
D. Dislocation
47. The breaking of crystals along definite direction is called _____________________?
A. Cleavage
B. Symmetry
C. Isotropy
D. Homogeneity
48. In simple cube one atom or molecule lies at its______________________?
A. Force corners
B. Nine corners
C. Eight corners
D. Six corners
49. A vacant or partially filled band is called _____________________?
A. Conduction band
B. Valence band
C. Forbidden band
D. Empty band
50. The electrons in conduction band are free to___________________?
A. Transport vibrations
B. Transport signals
C. Transport charge
D. Transport impulses