Free Online Tests - Electrolysis and Storage of Batteries Test1

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1. "The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity". The above statement is associated with _____.
Newton's law	Faraday's law of electromagnetic
Faraday's law of electrolysis	Gauss's law

2. The charge required to liberate one gram equivalent of any substance is known as ______ constant.
time	Faraday's
Boltzman	None of the Above

3. During the charging of a lead-acid cell _____.
its voltage increases	it gives out energy
its cathode becomes dark chocolate brown in colour	specific gravity of H2SO4 decreases

4. The capacity of a lead-acid cell does not depend on its ____.
temperature	rate of charge
rate of discharge	quantity of active material

5. During charging the specific gravity of the electrolyte of a lead-acid battery _____.
increases	decreases
remains the same	becomes zero

6. The active materials on the positive and negative plates of a fully charged lead-acid battery are _____.
lead and lead peroxide	lead sulphate and lead
lead peroxide and lead	none of the above

7. When a lead-acid battery is in fully charged condition, the colour of its positive plate is _____.
dark grey	brown
dark brown	none of above

8. The active materials of a nickel-iron battery are ______.
nickel hydroxide	powdered iron and its oxide
21% solution of KOH	all of the above

9. The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is _____.
just one	always greater than one
always less than one	none of the above

10. The best indication about the state of charge on a lead-acid battery is given by ______.
output voltage	temperature of electrolyte
specific gravity of electrolyte	none of the above

11. The storage battery generally used in electric power station is_____.
nickel-cadmium battery	zinc-carbon battery
lead-acid battery	none of the above

12. The output voltage of a charger is_____.
less than the battery voltage	higher than the battery voltage
the same as the battery voltage	none of the above

13. Cells are connected in series in order to_____.
increase the voltage rating	increase the current rating
increase the life of the cells	none of the above

14. Five 2 V cells are connected in parallel. The output voltage is _____.
1 V	1.5 V
1.75 V	2 V

15. The capacity of a battery is expressed in terms of _____.
current rating	voltage rating
ampere-hour rating	none of the above

16. Duringthe charging and discharging of a nickel-iron cell _____.
corrosive fumes are produced	water is neither formed nor absorbed
nickel hydroxide remains unsplit	its e.m.f. remains constant

17. As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of _____.
reducing time of charging	increasing cell capacity
both (a) and (b)	avoiding excessive gassing

18. A dead storage battery can be revived by _____.
adding distilled water	adding so-called battery restorer
a dose of H2SO4	none of the above

19. As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its _____.
compactness	lower e.m.f.
small quantity of electrolyte used	higher internal resistance

20. Trickle charging of a storage battery helps to _____.
maintain proper electrolyte level	increase its reserve capacity
prevent sulphation	keep it fresh and fully charged

Model Electrolysis and Storage of Batteries Online Quiz questions test2

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1. Those substances of the cell which take active part in chemical combination and hence produce electricity during charging or discharging are known as______materials.
passive	active
redundant	insert

2. In a lead-acid cell dilute sulphuric acid (electrolyte) approximately comprises the following _____.
one part H2O, three parts H2SO4	two parts H2O, two parts H2SO4
three parts H2O, one part H2SO4	all H2S04

3. It is noticed that durmg charging _____.
there is a rise in voltage	energy is absorbed by the cell
specific gravity of H2SO4 is increased	all of the above

4. It is noticed that during discharging the following does not happen _____.
both anode and cathode become PbS04	specific gravity of H2SO4 decreases
voltage of the cell decreases	the cell absorbs energy

5. The ampere-hour efficiency of a leadacid cell is normally between _____.
20 to 30%	40 to 50%
60 to 70%	90 to 95%

6. The watt-hour efficiency of a lead-acid cell varies between _____.
25 to 35%	40 to 60%
70 to 80%	90 to 95%

7. The capacity of a lead-acid cell is measured in _____.
amperes	ampere-hours
watts	watt-hours

8. The capacity of a lead-acid cell depends on _____.
rate of discharge	temperature
density of electrolyte	all of the above

9. When the lead-acid cell is fully charged, the electrolyte assumes _____ appearance.
dull	reddish
bright	milky

10. The e.m.f. of an Edison cell, when fully charged, is nearly _____.
1.4 V	1 V
0.9 V	0.8 V

11. The internal resistance of an alkali cell is nearly _____ times that of the lead-acid cell.
two	three
four	five

12. The average charging voltage for alkali cell is about _____.
1 V	1.2 V
1.7 V	2.1 V

13. On the average the ampere-hour efficiency of an Edison cell is about _____.
40%	60%
70%	80%

14. The active material of the positive plates of silver-zinc batteries is _____.
silver oxide	lead oxide
lead	zinc powder

15. Lead-acid cell has a life of nearly charges and discharges _____.
500	700
1000	1250

16. Life of the Edison cell is at least _____.
five years	seven years
eight years	ten years

17. The internal resistance of a lead-acid cell is that of Edison cell _____.
less than	more than
equal to	none of the above

18. Electrolyte used in an Edison cell is _____.
NaOH	KOH
HCL	HN03

19. Electrolyte used in a lead-acid cell is _____.
NaOH	only H2S04
only water	dilute H2SO4

20. Negative plate of an Edison cell is made of _____.
copper	lead
iron	silver oxide