Electrolysis and Storage of Batteries

51. In order that a hydrometer may float vertically in electrolyte its C.G. should be

1. lowered
2. raised
3. undisturbed
4. displaced sideways

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52. Internal resistance of a cell is due to

1. resistance of electrolyte
2. electrode resistance
3. surface contact resistance between electrode and electrolyte
4. all above

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53. Internal resistance of a cell is reduced by

1. using vent plug to permit gas formed during discharge
2. increasing the plate area
3. putting plates very close together
4. all above methods

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54. Internal short circuits are caused by

1. breakdown of one or more separators
2. excess accumulation of sediment at the bottom of the cell
3. both (a) and (b)
4. none of the above

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55. It is noticed that during discharging the following does not happen

1. both anode and cathode become PbS04
2. specific gravity of H2SO4 decreases
3. voltage of the cell decreases
4. the cell absorbs energy

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56. It is noticed that durum charging

1. there is a rise in voltage
2. energy is absorbed by the cell
3. specific gravity of H2SO4 is increased
4. the anode becomes chocolate brown in colour (PbCfe) and cathode becomes grey metallic lead (Pb)
5. all of the above

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57. Lead-acid cell has a life of nearly charges and discharges

1. 500
2. 700
3. 1000
4. 1250

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58. Level of electrolyte in a cell should be _________ the level of plates

1. below
2. equal to
3. above
4. none of the above

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59. Life of the batteries is in the following ascending order.

1. Lead-acid cell, Edison cell, Nickel cadmium cell
2. Lead-acid cell, Nickel-cadmium cell, Edison cell
3. Edison cell, Nickel-cadmium cell, lead-acid cell
4. Nickel-cadmium cell, Edison cell, lead-acid cell

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60. Life of the Edison cell is at least

1. five years
2. seven years
3. eight years
4. ten years

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