Power Sources – 1 – 1

1. Active materials of a lead-acid cell are :

(a) lead peroxide
(b) sponge lead
(c) dilute sulphuric acid
(d) all the above

ANSWER

EXPLANATION

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 H2SO4 is decreased

ANSWER

EXPLANATION

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)

ANSWER

EXPLANATION

4. The capacity of a cell is measured in :

(a) watt-hours
(b) watts
(c) amperes
(d) ampere-hours

ANSWER

EXPLANATION

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

ANSWER

EXPLANATION

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