- (A) Cast-iron
- (B) Graphite
- (C) Rubber
- (D) Glass
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- (A) copper and aluminium
- (B) tin and lead
- (C) nickel, copper and zinc
- (D) silver, copper and lead
- (A) Copper-constantan
- (B) Aluminium-tin
- (C) Silver-German silver
- (D) Iron-steel
- (A) GLS lamps
- (B) electric arc furnace
- (C) dry cells
- (D) cinema projectors
- (A) Silver nitrate
- (B) Ferric oxide
- (C) Small particles of iron
- (D) Silicon-iron
- (A) 2
- (B) 4
- (C) 7
- (D) 12
- (A) carbon crystals
- (B) solid carbon granules
- (C) pulverized coal
- (D) finely divided carbon black
- (A) covalent
- (B) metallic
- (C) Vander Waals
- (D) Vander Waals and covalent
- (A) produce harmonic distortion
- (B) follows Ohm’s law at low temperatures only
- (C) result in non-uniform heating
- (D) none of the above
- (A) adding impurities
- (B) reducing temperatures
- (C) application of magnetic field
- (D) any of the above
