Practice Test: Question Set - 10
1. Which of the following is the poorest conductor of electricity?
- (A) Carbon
- (B) Steel
- (C) Silver
- (D) Aluminium
2. Super conductivity can be destroyed by
- (A) Adding impurities
- (B) Reducing temperatures
- (C) Application of magnetic field
- (D) Any of the above
3. In graphite, bonding is
- (A) Covalent
- (B) Metallic
- (C) Vander Waals
- (D) Vander Waals and covalent
4. Carbon resistors are used extensively because they are
- (A) Easy to make
- (B) Compact
- (C) Inexpensive
- (D) All of the above reasons
5. Which of the following materials is used for making coils of standard resistances?
- (A) Copper
- (B) Nichrome
- (C) Platinum
- (D) Manganin
6. Which of the following factors affect resistivity of metals?
- (A) Age hardening
- (B) Alloying
- (C) Temperature
- (D) All of the above
7. Superconducting metal in super conducting state has relative permeability of
- (A) Zero
- (B) One
- (C) Negative
- (D) More than one
8. Copper, even though costly, finds use in the windings of electrical machines because
- (A) Copper points offer low contact resistance
- (B) Copper can be easily soldered and welded
- (C) Copper windings are less bulky and the machines
become compact
- (D) All of the above
9. Is an element used in semiconductors whose atoms have three valence electrons?
- (A) An acceptor
- (B) A donor
- (C) Germanium
- (D) Silicon
10. The minority carrier concentration is largely a function of
- (A) Forward biasing voltage
- (B) Reverse biasing voltage
- (C) Temperature
- (D) The amount of doping
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