Electrolysis and storage of batteries

11. As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its

compactness
lower e.m.f.
small quantity of electrolyte used
higher internal resistance

Detailed SolutionAs compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its

12. During the charging of a lead-acid cell

Its voltage increases
It gives out energy
Its cathode becomes dark chocolate brown in colour
Specific gravity of H2SO4 decreases

Detailed SolutionDuring the charging of a lead-acid cell

13. Chargmg of sulphated battery produces ____ heat.

no
very little
less
more

Detailed SolutionChargmg of sulphated battery produces ____ heat.

14. The active materials of a nickel-iron battery are

nickel hydroxide
powdered iron and its oxide
21% solution of kOH
all of the above

Detailed SolutionThe active materials of a nickel-iron battery are

15. Internal resistance of a cell is due to

resistance of electrolyte
electrode resistance
surface contact resistance between electrode and electrolyte
all above

Detailed SolutionInternal resistance of a cell is due to

16. Which of the following primary cells has the highest voltage ?

Manganese-alkaline
Carbon-zinc
Lithium
Mercury

Detailed SolutionWhich of the following primary cells has the highest voltage ?

17. Electrolyte used in an Edison cell is

NaOH
KOH
HCl
HNO3

Detailed SolutionElectrolyte used in an Edison cell is

18. Short circuiting of a cell may be caused

buckling of plates
faulty separators
lead particles forming circuit between positive and negative plates
excessive accumulation of sediment E. any one of above

Detailed SolutionShort circuiting of a cell may be caused

19. During the charging and discharging of a nickel-iron cell

corrosive fumes are produced
water is neither formed nor absorbed
nickel hydroxide remains unsplit
its e.m.f. remains constant

Detailed SolutionDuring the charging and discharging of a nickel-iron cell

20. The open circuit voltage of any storage cell depends wholly upon

its chemical constituents
on the strength of its electrolyte
its temperature
all above

Detailed SolutionThe open circuit voltage of any storage cell depends wholly upon

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