Electrolysis And Cell & Batteries Multiple Choice Questions And Answers -3 (English)

1. The current flow through electrolyte is due to the movement of
(A) ions
(B) holes
(C) electrons
(D) none of the above
Ans: (A)

2. If a lead-acid cell is discharged below 1.8 V the following will happen.
(A) Capacity of cell will reduce
(B) Sulphation of plates will occur
(C) Internal resistance will increase
(D) All above will occur
Ans: (D)

3. Each cell has a vent cap
(A) to allow gases out when the cell is on charge
(B) to add water to the cell if needed
(C) to check the level of electrolyte
(D) to do all above functions
Ans: (D)

4. Following will occur if level of electrolyte falls below plates
(A) capacity of the cell is reduced
(B) life of the cell is reduced
(C) open plates are converted to lead sulphate
(D) all above
Ans: (D)

5. Which of the following battery is used for air-craft ?
(A) Lead-acid battery
(B) Nickel-iron battery
(C) Dry cell battery
(D) Silver oxide battery
Ans: (B)

6. Cells are connected in parallel to
(A) increase the efficiency
(B) increase the current capacity
(C) increase the voltage output
(D) increase the internal resistance
Ans: (B)

7. In a battery cover is placed over the element and sealed to the top of the battery container. This is done
(A) to reduce evaporation of water from electrolyte
(B) to exclude dirt and foreign matter from the electrolyte
(C) to discharge both of the above functions
(D) to discharge none of the above functions
Ans: (C)

8. Level of electrolyte in a cell should be _____ the level of plates
(A) below
(B) equal to
(C) above
(D) none of the above
Ans: (C)

9. Under normal charging rate, the charging current should be
(A) 10% of capacity
(B) 20% of capacity
(C) 30% of capacity
(D) 40% of capacity
Ans: (A)

10. Satellite power requirement is provided through
(A) solar cells
(B) dry cells
(C) nickel-cadmium cells
(D) lead-acid batteries
Ans: (A)

11. A constant-voltage generator has
(A) minimum efficiency
(B) minimum current capacity
(C) low internal resistance
(D) high internal resistance
Ans: (C)

12. 48 ampere-hour capacity would deliver a current of
(A) 48 amperes for 1 hour
(B) 24 amperes for 2 hours
(C) 8 amperes for 6 hours
(D) 6 amperes for 8 hours
Ans: (D)

13. Mercury cell has which of the following characteristics ?
(A) Flat discharge current-voltage curve
(B) High power to weight ratio
(C) Comparatively longer shelf life under adverse conditions of high temperature and humidity
(D) All of the above
Ans: (D)

14. Which of the following factors adversely affects the capacity of the lead acid battery ?
(A) Temperature of surroundings
(B) Specific gravity of electrolyte
(C) Rate of discharge
(D) All of the above
Ans: (D)

15. Internal resistance of a cell is reduced by
(A) using vent plug to permit gas formed during discharge
(B) increasing the plate area
(C) putting plates very close together
(D) all above methods
Ans: (D)

16. Trickle charging of a storage battery helps to
(A) maintain proper electrolyte level
(B) increase its reserve capacity
(C) prevent sulphation
(D) keep it fresh and fully charged
Ans: (D)

17. It is noticed that durum charging
(A) there is a rise in voltage
(B) energy is absorbed by the cell
(C) specific gravity of H2SO4 is increased
(D) the anode becomes chocolate brown in colour (PbCfe) and cathode becomes grey metallic lead (Pb)
(E) all of the above
Ans: (E)

18. Which of the following cell has a. reversible chemical reaction ?
(A) Lead-acid
(B) Mercury oxide
(C) Carbon-zinc
(D) Silver-oxide
Ans: (A)

19. Batteries are charged by
(A) rectifiers
(B) engine generator sets
(C) motor generator sets
(D) any one of the above methods
Ans: (D)

20. Cell short circuit results in
(A) low specific gravity electrolyte
(B) abnormal high temperature
(C) reduced gassing on charge
(D) all above
Ans: (D)

(Cell And Battery MCQ In Hindi)