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11 . If a sample of germanium and a sample of silicon have the same impurity density and are kept at room temperature
A. both will have equal value of resistivity
B. both will have equal negative resistivity
C. resistivity of germanium will be higher than that of silicon
D. resistivity of silicon will be higher than that of germanium

12 . When an electric field E is applied to solid and liquid insulating materials, the internal field Ei acting at the location of atom is such that
A. Ei = E
B. Ei > E
C. Ei < E
D. Ei may be equal to or less than E

13 . Which element exhibits the property of inertia?
A. Resistance
B. Capacitance
C. Inductance
D. Both resistance and inductance

14 . For a permanent magnetic material
A. the residual induction and coercive field should be large
B. the residual induction and coercive field should be small
C. area of hysteresis loop should be small
D. initial relative permeability should be high

15 . In a coaxial cable, braided copper is used for
A. conductor B. shield
C. dielectric
D. jacket




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