1. Total number of electrons that can be accommodated in various electron states in a valence band of a given solid is equal to
a) atomic number of the solid.
b) half the number of atoms in the solid.
c) the number of atoms in the solid.
d) twice the number of atoms in the solid.
ans: a.
2. Vacant lattice sites in the halide crystals cause
a) plastic deformation and ionic conductivity.
b) transparency and diffusion.
c) diffusion and ionic conductivity.
d) plastic deformation and transparency.
ans: c.
3. For which of the following materials , is the Hall coefficient zero?
a) Metal.
b) Insulator.
c) Intrinsic semiconductor.
d) Alloy.
ans: c.
4. Principle of Hall effect is used in the construction of which one of the following?
a) Ammeter.
b) Voltmeter.
c) Galvanometer.
d) Gauss meter.
ans: d.
5. According to the Wiedemann-Franz law the ratio of thermal conductivity of electrical conductivity of a conductor is
a) independent of temperature.
b) directly proportional to temperature.
c) inversely proportional to temperature.
d) inversely proportional to square of temperature.
ans: b.
6. The correct sequence of increasing order of electrical resistivity of the given materials is
a) diamond, doped germanium , silicon, gold.
b) gold , silicon, doped germanium , diamond.
c) gold , doped germanium , silicon, diamond.
d) gold , diamond , silicon, doped germanium.
ans: c.
7. What is the correct arrangement of the following alloys in the decreasing order of resistivity?
a) German silver- constantan- monel metal.
b) German silver-monel metal- constantan.
c) constantan-monel model- German silver.
d) constantan - German silver- monel metal.
ans: d.
8. In metals, resistivity is composed of two parts : one part is characteristic of the particular substance. The other part is due to
a) applied voltage.
b) crystal imperfections.
c) applied magnetic field.
d) supplied thermal energy.
ans: b.
9. Which one of the following is correct? As frequency increases, the surface resistance of metal
a) decreases.
b) increases.
c) remains unchanged.
d) varies in an unpredictable manner.
ans: b.
10. The conductivity of a conducting material on being subject to critical magnetic field changes to
a) normal state.
b) unstable state.
c) temperature-independent state.
d) temperature-dependent state.
ans: a.
a) atomic number of the solid.
b) half the number of atoms in the solid.
c) the number of atoms in the solid.
d) twice the number of atoms in the solid.
ans: a.
2. Vacant lattice sites in the halide crystals cause
a) plastic deformation and ionic conductivity.
b) transparency and diffusion.
c) diffusion and ionic conductivity.
d) plastic deformation and transparency.
ans: c.
3. For which of the following materials , is the Hall coefficient zero?
a) Metal.
b) Insulator.
c) Intrinsic semiconductor.
d) Alloy.
ans: c.
4. Principle of Hall effect is used in the construction of which one of the following?
a) Ammeter.
b) Voltmeter.
c) Galvanometer.
d) Gauss meter.
ans: d.
5. According to the Wiedemann-Franz law the ratio of thermal conductivity of electrical conductivity of a conductor is
a) independent of temperature.
b) directly proportional to temperature.
c) inversely proportional to temperature.
d) inversely proportional to square of temperature.
ans: b.
6. The correct sequence of increasing order of electrical resistivity of the given materials is
a) diamond, doped germanium , silicon, gold.
b) gold , silicon, doped germanium , diamond.
c) gold , doped germanium , silicon, diamond.
d) gold , diamond , silicon, doped germanium.
ans: c.
7. What is the correct arrangement of the following alloys in the decreasing order of resistivity?
a) German silver- constantan- monel metal.
b) German silver-monel metal- constantan.
c) constantan-monel model- German silver.
d) constantan - German silver- monel metal.
ans: d.
8. In metals, resistivity is composed of two parts : one part is characteristic of the particular substance. The other part is due to
a) applied voltage.
b) crystal imperfections.
c) applied magnetic field.
d) supplied thermal energy.
ans: b.
9. Which one of the following is correct? As frequency increases, the surface resistance of metal
a) decreases.
b) increases.
c) remains unchanged.
d) varies in an unpredictable manner.
ans: b.
10. The conductivity of a conducting material on being subject to critical magnetic field changes to
a) normal state.
b) unstable state.
c) temperature-independent state.
d) temperature-dependent state.
ans: a.
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