electrolysis and storage of batteries MCQs – Page 3

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

electrolysis and storage of batteries Mcqs
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
51. Sulphated cells are indicated by____________?
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A. the loss of capacity of the cell

B. the decrease of the specific gravity

C. the low voltage of the cell on discharge

D. all above conditions
52. The active materials on the positive and negative plates of a fully charged lead-acid battery are_______?
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A. none of the above

B. lead peroxide and lead

C. lead and lead peroxide

D. lead sulphate and lead

53. The e.m.f. of an Edison cell, when fully charged, is nearly______________?
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A. 1.4 V

B. 1 V

C. 0.9 V

D. 0.8 V

54. Electrolyte used in a lead-acid cell is__________?
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A. NaOH

B. onlyH2S04

C. only water

D. dilute H2SO4
55. Internal resistance of a cell is reduced by__________?
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A. all above methods

B. putting plates very close together

C. using vent plug to permit gas formed during discharge

D. increasing the plate area

56. Following will occur if level of electrolyte falls below plates____________?
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A. life of the cell is reduced

B. all above

C. open plates are converted to lead sulphate

D. capacity of the cell is reduced

57. 48 ampere-hour capacity would deliver a current of___________?
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A. 6 amperes for 8 hours

B. 48 amperes for 1 hour

C. 8 amperes for 6 hours

D. 24 amperes for 2 hours

58. The output voltage of a charger is__________?
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A. less than the battery voltage

B. the same as the battery voltage

C. higher than the battery voltage

D. none of the above

59. Self charge of a Ni-Fe cell is _______ Edison cell
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A. much more than

B. more than

C. less than

D. equal to

60. Excessive charging a battery tends to____________?
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A. to corrode the positive plates into lead peroxide thereby weakening them physically

B. produce gassing

C. bring about all above changes

D. increase the internal resistance of the battery