Electrolysis And Cell & Batteries Multiple Choice Questions And Answers-1 (English)

1. In a lead-acid cell dilute sulfuric acid (electrolyte) approximately comprises the following
(A) one part H2O, three parts H2SO4
(B) two parts H2O, two parts H2SO4
(C) three parts H2O, one part H2SO4
(D) all H2S04
Ans: (C)

2. The ampere-hour efficiency of a leadacid cell is normally between
(A) 20 to 30%
(B) 40 to 50%
(C) 60 to 70%
(D) 90 to 95%
Ans: (D)

3. The watt-hour efficiency of a lead-acid cell varies between
(A) 25 to 35%
(B) 40 to 60%
(C) 70 to 80%
(D) 90 to 95%
Ans: (C)

4. The e.m.f. of an Edison cell, when fully charged, is nearly
(A) 1.4 V
(B) 1 V
(C) 0.9 V
(D) 0.8 V
Ans: (A)

5. The internal resistance of an alkali cell is nearly _____ times that of the lead-acid cell.
(A) two
(B) three
(C) four
(D) five
Ans: (D)

6. The average charging voltage for alkali cell is about
(A) 1 V
(B) 1.2 V
(C) 1.7 V
(D) 2.1 V
Ans: (C)

7. On the average the ampere-hour efficiency of an Edison cell is about
(A) 40%
(B) 60%
(C) 70%
(D) 80%
Ans: (D)

8. The active material of the positive plates of silver-zinc batteries is
(A) silver oxide
(B) lead oxide
(C) lead
(D) zinc powder
Ans: (A)

9. Lead-acid cell has a life of nearly charges and discharges
(A) 500
(B) 700
(C) 1000
(D) 1250
Ans: (D)

10. Electrolyte used in a lead-acid cell is
(A) NaOH
(B) onlyH2S04
(C) only water
(D) dilute H2SO4
Ans: (D)

11. Negative plate of an Edison cell is made of
(A) copper
(B) lead
(C) iron
(D) silver oxide
Ans: (C)

12. The open circuit voltage of any storage cell depends wholly upon
(A) its chemical constituents
(B) on the strength of its electrolyte
(C) its temperature
(D) all above
Ans: (D)

13. During the charging of a lead-acid cell
(A) its voltage increases
(B) it gives out energy
(C) its cathode becomes dark chocolate brown in colour
(D) specific gravity of H2SO4 decreases
Ans: (A)

14. The capacity of a lead-acid cell does not depend on its
(A) temperature
(B) rate of charge
(C) rate of discharge
(D) quantity of active material
Ans: (B)

15. During charging the specific gravity of the electrolyte of a lead-acid battery
(A) increases
(B) decreases
(C) remains the same
(D) becomes zero
Ans: (A)

16. The active materials on the positive and negative plates of a fully charged lead-acid battery are
(A) lead and lead peroxide
(B) lead sulphate and lead
(C) lead peroxide and lead
(D) none of the above
Ans: (C)

17. The storage battery generally used in electric power station is
(A) nickel-cadmium battery
(B) zinc-carbon battery
(C) lead-acid battery
(D) none of the above
Ans: (C)

18. The output voltage of a charger is
(A) less than the battery voltage
(B) higher than the battery voltage
(C) the same as the battery voltage
(D) none of the above
Ans: (B)

19. Cells are connected in series in order to
(A) increase the voltage rating
(6) increase the current rating
(C) increase the life of the cells
(D) none of the above
Ans: (A)

20. Five 2 V cells are connected in parallel. The output voltage is
(A) 1 V
(6) 1.5 V
(C) 1.75 V
(D) 2 V
Ans: (D)