Electrolysis And Storage Of Batteries — Part 2 MCQs with Explanations
Practice high-yield Electrical Engineering MCQs on Electrolysis And Storage Of Batteries — Part 2 with worked academic solutions for WAPDA, NTDC, IESCO, LESCO, PPSC, FPSC.
Questions
40
Difficulty Level
Exam-Level
Target Exams
WAPDA, NTDC, IESCO...
Estimated Time
48 mins
Exam-Level WAPDA NTDC IESCO LESCO PPSC FPSC
Verified for Commission Syllabus • Oct 14, 2026
40
Verified Practice Questions
Interactive test mode with detailed academic worked solutions
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🎉 Set complete! All 40 questions answered.
Question 1 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
48 ampere-hour capacity would deliver a current of
Correct Answer: Option D — 6 amperes for 8 hours
Detailed Academic Explanation:
6 amperes for 8 hours is the correct answer to “48 ampere-hour capacity would deliver a current of”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 2 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Following will occur if level of electrolyte falls below plates
Correct Answer: Option D — all above
Detailed Academic Explanation:
all above is the correct answer to “Following will occur if level of electrolyte falls below plates”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 3 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
In order that a hydrometer may float vertically in electrolyte its C.G. should be
Correct Answer: Option A — lowered
Detailed Academic Explanation:
lowered is the correct answer to “In order that a hydrometer may float vertically in electrolyte its C.G. should be”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 4 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Which of the following factors adversely affects the capacity of the leadacid battery ?
Correct Answer: Option D — All of the above
Detailed Academic Explanation:
All of the above is the correct answer to “Which of the following factors adversely affects the capacity of the leadacid battery”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 5 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The current flow through electrolyte is due to the movement of
Correct Answer: Option A — ions
Detailed Academic Explanation:
ions is the correct answer to “The current flow through electrolyte is due to the movement of”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 6 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The active materials on the positive and negative plates of a fully charged lead-acid battery are
Correct Answer: Option C — lead peroxide and lead
Detailed Academic Explanation:
lead peroxide and lead is the correct answer to “The active materials on the positive and negative plates of a fully charged lead-acid battery are”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 7 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Cells are connected in parallel to
Correct Answer: Option B — Increase the current capacity
Detailed Academic Explanation:
Increase the current capacity is the correct answer to “Cells are connected in parallel to”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 8 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
On the average the ampere-hour efficiency of an Edison cell is about
Correct Answer: Option D — 80%
Detailed Academic Explanation:
80% is the correct answer to “On the average the ampere-hour efficiency of an Edison cell is about”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 9 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
On overcharging a battery
Correct Answer: Option D — None of the above will occur
Detailed Academic Explanation:
None of the above will occur is the correct answer to “On overcharging a battery”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 10 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Batteries are charged by
Correct Answer: Option D — any one of the above methods
Detailed Academic Explanation:
any one of the above methods is the correct answer to “Batteries are charged by”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 11 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The active material of the positive plates of silver-zinc batteries is
Correct Answer: Option A — silver oxide
Detailed Academic Explanation:
silver oxide is the correct answer to “The active material of the positive plates of silver-zinc batteries is”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 12 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The capacity of a lead-acid cell does not depend on its
Correct Answer: Option B — rate of charge
Detailed Academic Explanation:
rate of charge is the correct answer to “The capacity of a lead-acid cell does not depend on its”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 13 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
During the charging and discharging of a nickel-iron cell
Correct Answer: Option B — water is neither formed nor absorbed
Detailed Academic Explanation:
water is neither formed nor absorbed is the correct answer to “During the charging and discharging of a nickel-iron cell”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 14 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Excessive charging a battery tends to
Correct Answer: Option D — bring about all above changes
Detailed Academic Explanation:
bring about all above changes is the correct answer to “Excessive charging a battery tends to”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 15 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
_______ of electrolyte indicates the state of charge of the battery
Correct Answer: Option D — specific gravity
Detailed Academic Explanation:
specific gravity is the correct answer to “_______ of electrolyte indicates the state of charge of the battery”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 16 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of
Correct Answer: Option C — both (A) and (B)
Detailed Academic Explanation:
both (A) and (B) is the correct answer to “As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 17 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Which of the following primary cells has the highest voltage ?
Correct Answer: Option C — Lithium
Detailed Academic Explanation:
Lithium is the correct answer to “Which of the following primary cells has the highest voltage”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 18 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Petroleum jelly is applied to the electrical connections to the lead-acid battery
Correct Answer: Option D — prevent corrosion
Detailed Academic Explanation:
prevent corrosion is the correct answer to “Petroleum jelly is applied to the electrical connections to the lead-acid battery”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 19 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Five 2 V cells are connected in parallel. The output voltage is
Correct Answer: Option D — 2 V
Detailed Academic Explanation:
2 V is the correct answer to “Five 2 V cells are connected in parallel. The output voltage is”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 20 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Charging a sulphated battery at high rate results in
Correct Answer: Option D — all above
Detailed Academic Explanation:
all above is the correct answer to “Charging a sulphated battery at high rate results in”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 21 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
During the idle period of the battery, strong electrolyte tends to change the active material of the cell into
Correct Answer: Option B — PbSC4
Detailed Academic Explanation:
PbSC4 is the correct answer to “During the idle period of the battery, strong electrolyte tends to change the active material of the cell into”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 22 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Electrolyte used in an Edison cell is
Correct Answer: Option B — KOH
Detailed Academic Explanation:
KOH is the correct answer to “Electrolyte used in an Edison cell is”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 23 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Life of the batteries is in the following ascending order.
Lead-acid cell, Edison cell, Nickel cadmium cell is the correct answer to “Life of the batteries is in the following ascending order.”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 24 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Mercury cell has which of the following characteristics?
Correct Answer: Option D — All of the above
Detailed Academic Explanation:
All of the above is the correct answer to “Mercury cell has which of the following characteristics”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 25 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Following will happen if battery charging rate is too high
Correct Answer: Option D — all above will occur
Detailed Academic Explanation:
all above will occur is the correct answer to “Following will happen if battery charging rate is too high”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 26 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Negative plate of an Edison cell is made of
Correct Answer: Option C — iron
Detailed Academic Explanation:
iron is the correct answer to “Negative plate of an Edison cell is made of”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 27 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The body of Edison cell is made of
Correct Answer: Option C — nickel plated steel
Detailed Academic Explanation:
nickel plated steel is the correct answer to “The body of Edison cell is made of”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 28 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The active materials of a nickel-iron battery are
Correct Answer: Option D — all of the above
Detailed Academic Explanation:
all of the above is the correct answer to “The active materials of a nickel-iron battery are”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 29 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its
Correct Answer: Option D — higher internal resistance
Detailed Academic Explanation:
higher internal resistance is the correct answer to “As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 30 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Dry cell is modification of
Correct Answer: Option B — Leclanche cell
Detailed Academic Explanation:
Leclanche cell is the correct answer to “Dry cell is modification of”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 31 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
In alkaline cell the electrolyte is
Correct Answer: Option D — kOH
Detailed Academic Explanation:
kOH is the correct answer to “In alkaline cell the electrolyte is”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 32 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
In a lead-acid cell, lead is called as
Correct Answer: Option B — negative active material
Detailed Academic Explanation:
negative active material is the correct answer to “In a lead-acid cell, lead is called as”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 33 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The common impurity in the electrolyte of lead-acid battery is
Correct Answer: Option D — iron
Detailed Academic Explanation:
iron is the correct answer to “The common impurity in the electrolyte of lead-acid battery is”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 34 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
The substances which combine together to store electrical energy during the charge are called ______ materials
Correct Answer: Option A — active
Detailed Academic Explanation:
active is the correct answer to “The substances which combine together to store electrical energy during the charge are called ______ materials”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 35 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
If a lead-acid cell is discharged below 1.8 V the following will happen.
Correct Answer: Option D — All above will occur
Detailed Academic Explanation:
All above will occur is the correct answer to “If a lead-acid cell is discharged below 1.8 V the following will happen.”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 36 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Sulphated cells are indicated by
Correct Answer: Option D — all above conditions
Detailed Academic Explanation:
all above conditions is the correct answer to “Sulphated cells are indicated by”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 37 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
Weston standard cell at 20°C has voltage of ____ volts.
Correct Answer: Option C — 1.0187
Detailed Academic Explanation:
1.0187 is the correct answer to “Weston standard cell at 20°C has voltage of ____ volts.”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 38 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
In constant voltage charging method, the charging current from discharged to fully charged condition
Correct Answer: Option A — decreases
Detailed Academic Explanation:
decreases is the correct answer to “In constant voltage charging method, the charging current from discharged to fully charged condition”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 39 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
In constant-current charging method, the supply voltage from discharged to fully charged condition
Correct Answer: Option B — increases
Detailed Academic Explanation:
increases is the correct answer to “In constant-current charging method, the supply voltage from discharged to fully charged condition”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
Question 40 of 40
★ WAPDA
★ NTDC
★ WAPDA
★ NTDC
A battery of 6 cells will show a drop of _____ volts from fully charged state to fully discharged state.
Correct Answer: Option C — 2.4
Detailed Academic Explanation:
2.4 is the correct answer to “A battery of 6 cells will show a drop of _____ volts from fully charged state to fully discharged state.”. This question is standard in competitive examination syllabi for Electrolysis And Storage Of Batteries.
💡Key Conceptual Anchor:Electrolysis And Storage Of Batteries
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A_C Fundamentals_ Circuits And Circuit Theory — Part 1
Master the next curriculum module with 40 exam-standard MCQs.
In competitive commission exams (FPSC, PPSC, KPPSC, SPSC, CSS, PMS), questions are frequently phrased with distractor options designed to catch rote learners. Whenever you answer an MCQ, read the Detailed Academic Explanation and Conceptual Anchor to understand why the remaining options are incorrect.