Practice Test: Question Set - 01
1. The kinetic energy of a bounded electron is
- (A) Less than that of unbounded electron
- (B) Greater than that of unbounded electron
- (C) Equal to that of unbounded electron
- (D) Infinite
2. Superconductors are becoming popular for use in
- (A) Generating very strong magnetic field
- (B) Manufacture of bubble memories
- (C) Generating electrostatic field
- (D) Generating regions free from magnetic field
3. Solder is an alloy of
- (A) Copper and aluminium
- (B) Tin and lead
- (C) Nickel, Copper and zinc
- (D) Silver, copper and lead
4. Which of the following affect greatly the resistivity of electrical conductors?
- (A) Composition
- (B) Pressure
- (C) Size
- (D) Temperature
5. The resistivity of a metal is a function of temperature because
- (A) The amplitude of vibration of the atoms varies with
temperature
- (B) The electron density varies with temperature
- (C) The electron gas density varies with temperature
- (D) None of the above
6. Due to which of the following factors the brush wear rate is altered?
- (A) Speed of the machine
- (B) Contact pressure
- (C) Surface conditions of brush and commutator
- (D) All of the above
7. Substances whose specific resistance abruptly decreases at very low temperature are called
- (A) Insulators
- (B) Conductors
- (C) Semiconductors
- (D) Superconductors
8. ________ has the best damping properties.
- (A) Diamond
- (B) High speed steel
- (C) Mild steel
- (D) Cast iron
9. For a particular material the Hall coefficient was found to be zero. The material is
- (A) Insulator
- (B) Metal
- (C) Intrinsic semiconductor
- (D) None of the above
10. The conduction of electricity, in semiconductors, takes place due to movement of
- (A) Positive ions only
- (B) Negative ions only
- (C) Positive and negative ions
- (D) Electrons and holes
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