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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 |
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