Questions about Batteries
Batteries – Multiple Choice Questions
1. What is the primary function of a battery?
A) Convert light energy into mechanical energy
B) Store heat energy
C) Convert chemical energy into electrical energy
D) Store kinetic energy
E) Provide fuel for combustion
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2. Which type of reaction powers most batteries?
A) Combustion
B) Redox (oxidation-reduction)
C) Precipitation
D) Neutralization
E) Polymerization
3. In a battery, what role does the anode play?
A) Site of reduction
B) Site of oxidation
C) Maintains charge balance
D) Absorbs heat
E) Dissolves the cathode
4. What occurs at the cathode of a battery?
A) Oxidation
B) Electron loss
C) Ion release
D) Reduction
E) Battery drain
5. What kind of battery can be recharged and reused?
A) Primary battery
B) Disposable battery
C) Dry cell
D) Alkaline battery
E) Secondary battery
6. A primary battery is:
A) Rechargeable
B) Based on nuclear energy
C) Disposable after use
D) Used only in cars
E) Made of a single metal
7. Which of the following is a common example of a secondary battery?
A) Zinc-carbon battery
B) Alkaline battery
C) Lithium-ion battery
D) Mercury battery
E) Silver-oxide battery
8. What is the electrolyte in a typical lead-acid battery?
A) Sodium chloride solution
B) Acetic acid
C) Sulfuric acid
D) Hydrochloric acid
E) Sodium hydroxide
9. Which battery type is most commonly used in portable electronics?
A) Lead-acid
B) Nickel-cadmium
C) Lithium-ion
D) Alkaline
E) Mercury
10. In a dry cell battery (like a AA battery), the paste serves as:
A) Cathode only
B) Anode only
C) Solid separator
D) Electrolyte
E) Conductor of electricity
11. Which of the following batteries is commonly used in automobiles?
A) Alkaline
B) Lithium-ion
C) Lead-acid
D) Nickel-metal hydride
E) Silver oxide
12. Which statement is true about lithium-ion batteries?
A) They are single-use
B) They use solid electrolytes
C) They have memory effect
D) They are lightweight and rechargeable
E) They contain mercury
13. What limits the lifespan of a rechargeable battery?
A) Water content
B) Voltage overuse
C) Repeated redox cycles degrading materials
D) Salt bridge failure
E) Expansion of electrodes
14. The voltage of a battery depends on:
A) Temperature only
B) Current flow
C) The chemical composition of the electrodes
D) Number of wires connected
E) Battery size only
15. In a lithium-ion battery, lithium ions:
A) Remain stationary
B) Flow from cathode to anode during discharge
C) Move from anode to cathode during discharge
D) Turn into lithium gas
E) Become electrons
16. The “memory effect” occurs mostly in which battery type?
A) Lead-acid
B) Alkaline
C) Lithium-ion
D) Nickel-cadmium
E) Zinc-carbon
17. Which of the following is not an advantage of lithium-ion batteries?
A) High energy density
B) Lightweight
C) No memory effect
D) Long lifespan
E) Low cost to manufacture
18. Which safety concern is associated with lithium-ion batteries?
A) They dissolve in water
B) They explode if overcharged or punctured
C) They stop working in the dark
D) They rust quickly
E) They contain radioactive materials
19. Button cells are commonly used in:
A) Laptops
B) Electric cars
C) Watches and hearing aids
D) Airplanes
E) Water heaters
20. Recycling batteries is important because:
A) They contain valuable and potentially toxic metals
B) It saves plastic
C) It increases voltage
D) It reduces oxidation
E) They turn into fertilizer
- Questions about Electrochemical Reactions
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Answer Key with Explanations
1. C – Batteries convert chemical energy into electrical energy through redox reactions.
2. B – Battery operation is based on oxidation-reduction (redox) reactions.
3. B – Oxidation (electron loss) occurs at the anode.
4. D – Reduction (electron gain) occurs at the cathode.
5. E – Secondary batteries can be recharged and reused.
6. C – A primary battery is used once and then discarded.
7. C – Lithium-ion is a popular rechargeable (secondary) battery.
8. C – Sulfuric acid is the electrolyte in lead-acid batteries.
9. C – Lithium-ion is most common in phones, laptops, etc.
10. D – In dry cells, the paste is the electrolyte.
11. C – Lead-acid batteries are used in vehicles.
12. D – Lightweight and rechargeable, lithium-ion batteries dominate electronics.
13. C – Repeated redox cycles cause wear on battery materials, limiting life.
14. C – Battery voltage depends on electrode materials' potential difference.
15. C – During discharge, lithium ions move from anode to cathode.
16. D – The memory effect mostly affects nickel-cadmium batteries.
17. E – Lithium-ion batteries are relatively expensive to produce.
18. B – Overcharging or puncturing lithium-ion batteries can cause fires or explosions.
19. C – Button cells power small devices like watches and hearing aids.
20. A – Batteries contain valuable metals like lithium and toxic elements like lead and cadmium.
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