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Electrolysis and Storage Batteries MCQ

1.“The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity”.The above statement is associated with 

  • ANewton’s law
  • BFaraday’s law of electromagnetic induction
  • CFaraday’s law of electrolysis
  • DGauss’s law
Answer / Hint Save Question
Correct Answer : (C)

Faraday’s law of electrolysis
Explanation:

2.The charge required to liberate one-gram equivalent of any substance is known as ________  constant

  • ATime
  • BFaraday’s
  • CBoltzmann
  • DFaraday’s and Boltzmann
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Correct Answer : (B)

Faraday’s
Explanation:

3.The capacity of a cell is measured in

  • AAmperes
  • BAmperes - hours
  • CWatts
  • DWatt – hours
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Correct Answer : (B)

Amperes - hours
Explanation:

4.Active materials of a lead acid cell are

  • ASpongy lead
  • BLead peroxide
  • CDilute sulfuric acid
  • DAll of the above
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Correct Answer : (D)

All of the above
Explanation:

5.Sulphation in a lead-acid battery occurs due to

  • AHeavy charging
  • BFast charging
  • CTrickle charging
  • DIncomplete charging
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Correct Answer : (D)

Incomplete charging
Explanation:

6.The capacity of lead-acid cell does not depend on its

  • ATemperature
  • BRate of charge
  • CRate of discharge
  • DQuantity of active materials
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Correct Answer : (B)

Rate of charge
Explanation:

7.During charging the specific gravity of the electrolyte of a lead-acid battery 

  • AIncreases
  • BDecreases
  • CRemains the same
  • DBecomes zero
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Correct Answer : (A)

Increases
Explanation:

8.The active materials on the positive and negative plates of a fully charged lead-acid battery are

  • ALead and lead peroxide
  • BLead sulphate and lead
  • CLead peroxide and lead
  • DNone of the above
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Correct Answer : (C)

Lead peroxide and lead
Explanation:

9.When a lead-acid battery is in fully charged condition, the colour of its positive plate is

  • ADark grey
  • BBrown
  • CDark brown
  • DNone of the above
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Correct Answer : (C)

Dark brown
Explanation:

10.The active materials of nickel-iron battery are

  • ANickel hydroxide
  • BPowered iron and its oxide
  • C21 % solution of KOH
  • DAll of the above
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Correct Answer : (D)

All of the above
Explanation:

11.The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is

  • AJust one
  • BAlways greater than one
  • CAlways less than one
  • DNone of the above
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Correct Answer : (B)

Always greater than one
Explanation:

12.The best indication about the state of charge on a lead-acid battery is given by

  • AOutput voltage
  • BTemperature of electrolyte
  • CSpecific gravity of electrolytes
  • DNone of the above
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Correct Answer : (C)

Specific gravity of electrolytes
Explanation:

13.The storage battery generally used in electric power station is

  • ANickel cadmium battery
  • BZinc-carbon battery
  • CLead-acid battery
  • DNone of the above
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Correct Answer : (C)

Lead-acid battery
Explanation:

14.The output voltage of a charger is

  • ALess than the battery voltage
  • BHigher than the battery voltage
  • CThe same as the battery voltage
  • DNone of the above
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Correct Answer : (B)

Higher than the battery voltage
Explanation:

15.Cells are connected in series in order to 

  • AIncrease the voltage rating 
  • BIncrease the current rating 
  • CIncrease the life of the cells 
  • DNone of the above 
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Correct Answer : (A)

Increase the voltage rating 
Explanation:

16.Five 2 V cells are connected in parallel. The output voltage is

  • A1 V
  • B1.5 V
  • C1.75 V
  • D2 V
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Correct Answer : (D)

2 V
Explanation:

17.The capacity of a battery is expressed in terms of

  • ACurrent rating
  • BVoltage rating
  • CAmpere-hour rating
  • DNone of the above
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Correct Answer : (C)

Ampere-hour rating
Explanation:

18.During the charging and discharging of a nickel-iron cell

  • ACorrosive fumes are produced
  • BWater is neither formed nor absorbed
  • CNickel hydroxide remains upsplits
  • DIts e.m.f remains constant
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Correct Answer : (B)

Water is neither formed nor absorbed
Explanation:

19.As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of

  • AReducing time charging
  • BIncreasing cell capacity
  • CBoth (a0 and (b)
  • DAvoiding excessive gassing
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Correct Answer : (C)

Both (a0 and (b)
Explanation:

20.As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its

  • ACompactness
  • BLower e.m.f
  • CSmaller quantity of electrolyte used
  • DHigher internal resistance
Answer / Hint Save Question
Correct Answer : (D)

Higher internal resistance
Explanation:

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