- (A) Composition
- (B) Pressure
- (C) Size
- (D) Temperature
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- (A) Tin-lead
- (B) Tin-silver-lead
- (C) Copper-zinc
- (D) None of the above
- (A) linear
- (B) hexagonal
- (C) orthorhombic
- (D) cubic
- (A) Speed of the machine
- (B) Contact pressure
- (C) Surface conditions of brush and commutator
- (D) Excessive sparking
- (E) All of the above
- (A) inject more charge carriers
- (B) reduce the energy gap
- (C) increase the kinetic energy of valence electrons
- (D) all of the above
- (A) easy to make
- (B) compact
- (C) inexpensive
- (D) all of the above reasons
- (A) Non-metal solids except carbon
- (B) Air and most other gases
- (C) Pure water and liquids in general except mercury
- (D) All of the above
- (A) carbon rod serves as conductor
- (B) carbon can resist the attack of battery acid
- (C) both (A) and (B)
- (D) either (A) or (B)
- (A) Silica
- (B) Germanium
- (C) Selenium
- (D) Gallium-arsenide
- (A) 1
- (B) 2
- (C) 4
- (D) 8
