Ans: (c)
269. Nichrome is used in electric heaters and irons because
   (a) it resists oxidation when red hot
   (b) its melting point is high
   (c) it has got 60 times the resistance of copper
   (d) All the above
Ans: (d)
270. The resistance of a wire depends on
   (a) the material of the wire
   (b) the length of the wire
   (c) the cross section of the wire
   (d) All the above
Ans: (d)
271.   Resistance is measured in
   a)  Volts
   b)  Amperes
   c)  ohms
   d)  coulombs
Ans: (c)
272. The electroplating of a metallic article
   (a) protects the article from atmospheric corrosion
   (b) gives it a more attractive appearance
   (c) Both (a) and (b) above
   (d) None of the above
Ans: (c)
273. The filament used in the electric lamp is made of
   (a) nichrome
   (b) tungsten
   (c) copper
   (d) aluminium
Ans: (b)