Power Sources » Exercise – 1
1. Active materials of a lead-acid cell are :
(a) lead peroxide
(b) sponge lead
(c) dilute sulphuric acid
(d) all the above
2. During the charging of a lead-acid cell :
(a) its cathode becomes dark chocolate brown in colour
(b) its voltage increases
(c) it gives out energy
(d) specific gravity of H2SO4is decreased
3. The ratio of Ah efficiency to Wh efficiency of a lead-acid cell is :
(a) always less than one
(b) just one
(c) always greater than one
(d) either (a) or (b)
4. The capacity of a cell is measured in :
(a) watt-hours
(b) watts
(c) amperes
(d) ampere-hours
5. The capacity of a lead-acid cell does NOT depend on its :
(a) rate of charge
(b) rate of discharge
(c) temperature
(d) quantity of active material
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