Q. Resistivity of conducting materials is in order of ____.
A. 10-12Ω-m
B. 10-12Ω/m
C. 1012Ω-m
D. 10-8Ω-m
Ans.: D
Q. Which of the following has high resistivity?
A. Manganin
B. Constantan
C. Nichrome and Tungsten
D. All of the above
Ans.: D
Q. Some metals and chemical compounds whose resistivity becomes zero when their temperature is brought near 0 Kelvin. These are known as_____.
A. Supperconductivity
B. High resistivity
C. Both A and B
D. none of the above
Ans.: A
Q. The temperature at which the transition takes place from the normal conductivity to that of superconductivity is known as___.
A. Supper conductor
B. Dielectrics
C. Transition temperature
D. Low resistivity
Ans.: C
Q. The factors affecting the conductivity of metals is/are
A. Alloying, Temperature
B. Age hardening
C. Mechanical stressing
D. all of the above
Ans.:D
Q. The resistance of conducting material ____ with temperature.
A. decrease
B. increase
C. remains same
D. none of the above
Ans.: B
Q. The resistance of non-conducting materials ______ with temperature.
A. increase
B. decrease
C. First increase then decrease
D. remains same
Ans.: B
Q. The electrical resistivity of an alloy____ with age hardening.
A. Decrease
B. increase
C. does not change
D. any of the above
Ans.: B
Q. The resistivity of insulating materials is order of _____.
A. 10-12Ω-m
B. 10-5Ω-m
C. 1012Ω-m
D. 10-10Ω-m
Ans.: C
Q. The resistivity of semiconductor materials lies in between _____.
A. from 104to 0.5Ω-m
B. from 10-14to 0.5Ω-m
C. from 10-4to 0.5Ω-m
D. from 10 to 0.5Ω-m
Ans.: C
Q. Semiconductors are ___ resistors.
A. linear
B. non linear
C. Both A and B
D. None of the above
Ans.: B
Q. Which of the following material have the property of “the resistivity or conductivity changes considerably when even minute amount of certain substance called impurities are added to them”?
A. Conductors
B. Dielectrics or insulators
C. Semiconductors
D. All of the above
Ans.: C
Q. Which of the following energy band may exist in any given material?
A. conduction band or energy band
B. Valence band
C. Both A and B
D. None of the above
Ans.: C
Q. The energy or conduction band and valance band is separated by an energy gas in which no electron can exist. This gap is known as______.
A. Energy band
B. valance band
C. Both A and B
D. forbidden energy gap or forbidden gap
Ans.: D
Q. The charge transport mechanism are____.
A. drift- due to an applied electric field
B. diffusion- due to a density gradient
C. Both A and B
D. None of the above
Ans.: C