(d) the final potential is always the mean of the original potential of the two
Ans: (d)
149. The electrolyte in a car battery is : [BPSC (Pre) 1998]
   (a) hydrochloric acid
   (b) nitric acid
   (c) sulphuric acid
   (d) distilled water
Ans: (b)
150. Who was the inventor of voltaic cell :
   (a) Benjamin Franklin
   (b) Thomas Edison
   (c) Alizendro Voltas
   (d) Kirchhoff
Ans: (c)
151. Two pieces of metallic wire having equal length and equal volume placed
   in air have different resistances. The two wires must: [NDA 2010]
   (a) have different cross sections
   (b) have different temperatures
   (c) be of different materials
   (d) be of same density
Ans: (c)
152. The process of zinc lamination (coating) on the iron is called: [JPCS (Pre)
   (a) galvanization
   (b) electroplating
   (c) ionisation
   (d) None of these
Ans: (a)
153. The absolute zero of temperature is [JPSC (Pre) 2011]
   (a) the starting point of any scale of temperature
   (b) the lowest temperature that is theoretically possible