Electrolysis And Cell & Batteries Multiple Choice Questions And Answers -2 (English)

1. The capacity of a battery is expressed in terms of
(A) current rating
(B) voltage rating
(e) ampere-hour rating
(D) none of the above
Ans: (C)

2. During the charging and discharging of a nickel-iron cell
(A) corrosive fumes are produced
(B) water is neither formed nor absorbed
(C) nickel hydroxide remains unsplit
(D) its e.m.f. remains constant
Ans: (B)

3. Those substances of the cell which take active part in chemical combination and hence produce electricity during charging or discharging are known as______materials.
(A) passive
(B) active
(C) redundant
(D) inert
Ans: (B)

4. The capacity of a lead-acid cell is measured in
(A) amperes
(B) ampere-hours
(C) watts
(D) watt-hours
Ans: (B)

5. The capacity of a lead-acid cell depends on
(A) rate of discharge
(B) temperature
(C) density of electrolyte
(D) quantity of active materials
(E) all above
Ans: E

6. The internal resistance of a lead-acid cell is that of Edison cell
(A) less than
(B) more than
(C) equal to
(D) none of the above
Ans: (A)

7. Electrolyte used in an Edison cell is
(A) NaOH
(B) KOH
(C) HC1
(D) HN03
Ans: (B)

8. Life of the Edison cell is at least
(A) five years
(B) seven years
(C) eight years
(D) ten years
Ans: (A)

9. A dead storage battery can be revived by
(A) adding distilled water
(6) adding so-called battery restorer
(C) a dose of H2SO4
(D) none of the above
Ans: (D)

10. As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its
(A) compactness
(B) lower e.m.f.
(C) small quantity of electrolyte used
(D) higher internal resistance
Ans: (D)

11. The specific gravity of electrolyte is measured by
(A) manometer
(B) a mechanical gauge
(C) hydrometer
(D) psychrometer
Ans: (C)

12. Over charging
(A) produces excessive gassing
(B) loosens the active material
(C) increases the temperature resulting in buckling of plates
(D) all above
Ans: (D)

13. Undercharging
(A) reduces specific gravity of the electrolyte
(B) increases specific gravity of the electrolyte
(C) produces excessive gassing
(D) increases the temperature
Ans: (A)

14. “The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity”.
The above statement is associated with
(A) Newton’s law
(B) Faraday’s law of electromagnetic
(C) Faraday’s law of electrolysis
(D) Gauss’s law
Ans: (C)

15. The charge required to liberate one gram equivalent of any substance is known as ______ constant
(A) time
(B) Faraday’s
(C) Boltzmann

(D) none of above
Ans: (B)

16. When a lead-acid battery is in fully charged condition, the color of its positive plate is
(A) dark grey
(B) brown
(C) dark brown
(D) none of above
Ans: (C)

17. The active materials of a nickel-iron battery are
(A) nickel hydroxide
(6) powdered iron and its oxide
(C) 21% solution of KOH
(D) all of the above
Ans: (D)

18. The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is
(A) just one
(B) always greater than one
(C) always less than one
(D) none of the above.
Ans: (B)

19. The best indication about the state of charge on a lead-acid battery is given by
(A) output voltage
(B) temperature of electrolyte
(C) specific gravity of electrolyte
(D) none of the above
Ans: (C)

20. As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of
(A) reducing time of charging
(B) increasing cell capacity
(C) both (A) and (B)
(D) avoiding excessive gassing
Ans: (C)

Electrolysis And Cell & Batteries  Multiple Choice Questions And Answers