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electrolysis and storage of batteries MCQs

Practise focused electrolysis and storage of batteries questions with marked answers for exam preparation and subject revision.

electrolysis and storage of batteries Mcqs
1. For a cell to work, which of the following condition(s) become necessary ___________?
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A. Two electrodes of different metas should be inserted in the electrolyte, not touching each other

B. All above three conditions are necessary

C. Electrolyte must chemically react with one of the electrodes

D. Electrolyte liquid or paste should be conducting

2. Cell short circuit results in_________?
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A. reduced gassing on charge

B. abnormal high temperature

C. low sp. gravity electrolyte

D. all above
3. It is noticed that durum charging___________?
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A. the anode becomes chocolate brown in colour (PbCfe) and cathode becomes grey metallic lead (Pb)

B. all of the above

C. energy is absorbed by the cell

D. specific gravity of H2SO4 is increased

E. there is a rise in voltage

4. During the charging of a lead-acid cell__________?
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A. specific gravity of H2SO4 decreases

B. its voltage increases

C. its cathode becomes dark chocolate brown in colour

D. it gives out energy

5. Level of electrolyte in a cell should be ________ the level of plates
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A. above

B. equal to

C. none of the above

D. below

6. Which among the following constitutes the major load for an automobile battery _________?
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A. Self starter

B. Brake light

C. Parking lights

D. Spark plugs

7. It is noticed that during discharging the following does not happen___________?
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A. both anode and cathode become PbS04

B. specific gravity of H2SO4 decreases

C. voltage of the cell decreases

D. the cell absorbs energy

8. As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its__________?
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A. lower e.m.f.

B. higher internal resistance

C. small quantity of electrolyte used

D. compactness

9. The open circuit voltage of any storage cell depends wholly upon___________?
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A. its chemical constituents

B. its temperature

C. on the strength of its electrolyte

D. all above
10. Capacity of dry cells is_________?
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A. none of the above

B. unaffected by the type of discharge

C. more when it is supplying current for intermittent periods

D. more when it is supplying current for continuous periods

11. Shelf life of a small dry cell is___________?
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A. less than that of large dry cell

B. none of the above

C. equal to that of large dry cell

D. more than that of large dry cell

12. Charging of sulfated battery produces _________ heat
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A. very little

B. less

C. more

D. no

13. In a lead-acid cell, lead is called as____________?
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A. none of the above

B. passive material

C. negative active material

D. positive active material

14. In constant-current charging method, the supply voltage from discharged to fully charged condition____________?
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A. decreases

B. remains constant

C. none of the above

D. increases
15. A typical output of a solar cell is_____________?
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A. 0.26 V

B. 2 V

C. 0.1V

D. 1.1 V

16. Internal short circuits are caused by___________?
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A. breakdown of one or more separators

B. excess accumulation of sediment at the bottom of the cell

C. both (A) and (B)

D. none of the above

17. When the lead-acid cell is fully charged, the electrolyte assumes _______ appearance
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A. reddish

B. bright

C. dull

D. milky
18. Life of the batteries is in the following ascending order____________?
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A. Nickel-cadmium cell, Edison cell, lead-acid cell

B. Lead-acid cell, Nickel-cadmium cell, Edison cell

C. Edison cell, Nickel-cadmium cell, lead-acid cell

D. Lead-acid cell, Edison cell, Nickel cadmium cell
19. Specific gravity of electrolyte in Edison cell is_____________?
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A. 0.8

B. 1.1

C. 0.95

D. 1.21
20. Battery charging equipment is generally installed______________?
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A. as near as practical to the battery being charged

B. in clean and dry place

C. in location having all above features

D. in well ventilated location

21. If a battery is wrongly connected on charge following will happen__________?
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A. current drawing will be very small

B. current delivered by the battery will be high

C. current drawing will be nil

D. current drawing will be very high
22. Trickle charging of a storage battery helps to___________?
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A. keep it fresh and fully charged

B. maintain proper electrolyte level

C. prevent sulphation

D. increase its reserve capacity

23. In a lead-acid cell, if the specific gravity of sulphuric acid is 1.8, it will require following ratio of acid to water to get mixture of specific gravity of 1.3
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A. 4 parts of acid to 4 parts of water

B. 4 parts of acid to 6 parts of water

C. 6 parts of acid to 4 parts of water

D. 4 parts of acid to 8 parts of water

24. The effect of sulphation is that the internal resistance__________?
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A. decreases

B. increases

C. none of the above

D. remains same

25. The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity. The statement is associated with____________?
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A. Faradays law of electromagnetic

B. Faradays law of electrolysis

C. Gausss law

D. Newtons law

26. A dead storage battery can be revived by___________?
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A. a dose of H2SO4

B. none of the above

C. adding so-called battery restorer

D. adding distilled water

27. Each cell has a vent cap________?
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A. to add water to the cell if needed

B. to check the level of electrolyte

C. to allow gases out when the cell is on charge

D. to do all above functions
28. Following will happen if the specific gravity of electrolyte becomes more than 1.23
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A. All above

B. Loss of life

C. Corrosion of the grids of the plate

D. Loss of capacity

29. Excessive formation of lead sulphate on the surface of the plates happens because of___________?
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A. low level of electrolyte

B. all above

C. persistent undercharging

D. allowing a battery to stand in discharged condition for a long time

E. topping up with electrolyte

30. Cells are connected in series in order to_____________?
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A. increase the life of the cells

B. increase the voltage rating

C. none of the above

D. increase the current rating

31. In a battery cover is placed over the element and sealed to the top of the battery container. This is done____________?
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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

32. While preparing electrolyte for a lead-acid battery___________?
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A. water is poured into acid

B. anyone of the two can be added to other chemical

C. acid is poured into water
33. Five 2 V cells are connected in parallel. The output voltage is__________?
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A. 2 V

B. 1.75 V

C. 1 V

D. 1.5 V

34. Which of the following factors adversely affects the capacity of the leadacid battery ?
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A. Temperature of surroundings

B. Specific gravity of electrolyte

C. Rate of discharge

D. All of the above
35. On overcharging a battery____________?
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A. it will increase the capacity of the battery

B. none of the above will occur

C. it will raise the specific gravity of the electrolyte

D. it will bring about chemical change in active materials

36. The substances which combine together to store electrical energy during the charge are called ________ materials
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A. active

B. passive

C. inert

D. dielectric

37. On the average the ampere-hour efficiency of an Edison cell is about__________?
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A. 70%

B. 40%

C. 80%

D. 60%

38. The internal resistance of a lead-acid cell is that of Edison cell____________?
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A. equal to

B. less than

C. more than

D. none of the above

39. The capacity of a battery is expressed in terms of____________?
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A. voltage rating

B. current rating

C. none of the above

D. ampere-hour rating
40. When the load resistance equals the generator resistance which of the following will be maximum __________?
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A. Efficiency of the circuit

B. Power in the load resistance

C. Current

D. Voltage across the load resistance

41. When two batteries are connected in parallel, it should be ensured that___________?
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A. they have same ampere-hour capacity

B. they have identical internal resistance

C. they have same e.m.f.

D. they have same make

42. Those substances of the cell which take active part in chemical combination and hence produce electricity during charging or discharging are known as________materials
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A. passive

B. active

C. redundant

D. inert

43. Ampere hour capacity of an industrial battery is based on _______ hours discharge rate
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A. 8

B. 24

C. 12

D. 16

44. ______ of electrolyte indicates the state of charge of the battery
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A. specific gravity

B. viscosity

C. mass

D. colour

45. In alkaline cell the electrolyte is_____________?
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A. KOH

B. concentrated sulphuric acid

C. NaOH

D. dilute sulphuric acid

46. If a lead-acid cell is discharged below 1.8 V the following will happen.____________?
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A. Capacity of cell will reduce

B. All above will occur

C. Internal resistance will increase

D. Sulphation of plates will occur

47. Which of the following is incorrect ?
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A. A primary cell has an irreversible chemical reaction

B. A carbon-zinc cell has unlimited shelf life

C. A lead-acid cell can be recharged

D. A storage cell has a reversible chemical reaction

48. The current flow through electrolyte is due to the movement of____________?
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A. electrons

B. ions

C. none of the above

D. holes

49. The lead-acid cell should never be discharged beyond____________?
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A. 2 V

B. 1.8 V

C. 2.1 V

D. 1.9 V

50. The specific gravity of electrolyte is measured by____________?
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A. a mechanical gauge

B. psychrometer

C. manometer

D. hydrometer