Q. 1Arrange following alloys in decreasing order of their resistivity.
A. Constantan- German silver- monel metal
B. German silver- constantan- monel metal
C. German silver- monel metal- constantan
D. constantan- monel metal- German silver
Ans.: A
Q. 2 Which of the following factors affect the resistivity of the materials?
A. cold working, temperature
B. age hardening
C. mechanical stress, alloying
D. All of the above
Ans.: D
Q. 3 which of the following is a correct sequence for increasing of resistivity of the materials?
A. gold, silicon, diamond, doped germanium
B. gold, doped germanium, silicon, diamond
C. diamond, doped germanium, silicon, gold
D. doped germanium, gold, diamond, silicon
Ans.: B
Q.4 Which of the following factors affect the resistivity of electrical conductors?
A. temperature
B. pressure
C. composition
D. size
Ans.: C
Q. 5 which of the following property exhibit in materials when materials is in superconducting state?
A. Repelling electric field
B. Repelling magnetic field
C. absorbing magnetic field
D. absorbing electric field
Ans.: B
Q. 6 The energy gap of superconductor is____.
A. minimum at a critical temperature
B. independent of temperature
C. decrease with increase in temperature
D. maximum at a critical temperature
Ans.: A
Q.7 In which of the following superconductivity is observed?
A. frequency having no effect
B. dc and low frequency
C. ac and low frequency
D. none of the above
Ans.: B
Q. 8 Copper has _____ in comparison to that of aluminium.
A. high resistivity
B. low resistivity
C. low specific resistance
D. low conductivity
Ans.: B
Q.9 A supper conductor may be used for____.
A. to rise temperature
B. to generate electricity
C. to generate magnetic field
D. to create pressure
Ans.: C
Q. 10 Carbon is ___.
A. conducting material
B. insulating material
C. semi conducting material
D. any of the above
Ans.: C
Q. 11 Out of the following properties, a good electrical contact material should have?
A. good thermal conductivity
B. high melting point
C. high conductivity
D. All of the above
Ans.: D
Q. 12 Which of the following is employed for winding of coils for dc machine?
A. copper
B. Aluminium
C. Tungsten
D. none of the above
Ans.: A
Q. 13 ____ has zero temperature coefficient of resistance.
A. Aluminium
B. Nichrome
C. Magnanin
D. all have same temperature coefficient
Ans.: C
Q. 14 which of the following has highest dielectric strength?
A. Marble
B. cotton
C. Polystyrene
D. Transformer oil
Ans.: C
Q.15 The capacitance per unit volume is maximum for
A. mica capacitor
B. electrolytic capacitor
C. air capacitor
D. ceramic capacitor
Ans.: B
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