In this article, we shared the batteries and cells multiple choice questions and answers.
Batteries MCQ
The below list provides all the multiple-choice questions related to electrical batteries.
Answers are available at the bottom of the article.
1. A battery is connected to a resistance causing a current of 0.5 A in the circuit.
The current drops to 0.4 A when an additional resistance of 5 ω is connected in series.
The current will drop to 0.2 A when the resistance is further increased by
| A) | 10 ω |
| B) | 15 ω |
| C) | 25 ω |
| D) | 40 ω |
2. Which of the following statements is correct about lead-acid batteries?
| A) | It has lead as positive plates. |
| B) | Density of electrolyte increases while delivering current |
| C) | It delivers current as soon as its components are put together. |
| D) | lt does not deliver current on putting its components together until it is supplied electrical energy from an external source |
3. Capacity of a dry cell is
| A) | more when it supplies current continuously. |
| B) | more when it supplies current intermittently. |
| C) | not affected by the type of discharge. |
| D) | none of these answers |
4. In a lead-acid battery, fillers are provided to
| A) | prevent flow of gasses. |
| B) | reduce tendency for polarisation. |
| C) | facilitate flow of gasses |
| D) | recover acid losses through vapours. |
5. In a lead-acid battery, separators are provided to
| A) | avoid internal short circuits. |
| B) | reduce internal resistance. |
| C) | facilitate flow of the current. |
| D) | increase the energy efficiency. |
6. The condition of a fully charged lead-acid battery cannot be ascertained by
| A) | voltage. |
| B) | colour of the electrolyte. |
| C) | specific gravity of the electrolyte. |
| D) | colour of the electrodes. |
| E) | gassing. |
7. Five cells are connected in series in a row and then four such rows are connected in parallel to feed the current to a resistive load of 1.25 ω.
Each cell has an emf of 1.5 V with an internal resistance of 0.2 ω.
The current through the load will be
| A) | 3.33 A |
| B) | 1 A |
| C) | 23.33 A |
| D) | 5 A |
8. The emf of a primary cell depends upon the
| A) | nature of electrode. |
| B) | physical dimensions of a cell. |
| C) | nature of electrolyte. |
| D) | both nature of electrolyte and nature of electrode. |
9. The capacity of a lead-acid battery does not depend upon
| A) | temperature. |
| B) | density of electrolyte & quantity of active material. |
| C) | charge rate. |
| D) | plate surface area. |
| E) | discharge rate. |
10. In lead acid batteries, sedimentation occurs due to
| A) | overcharging at slow rate. |
| B) | overcharging at high rate |
| C) | idleness for a longer period. |
| D) | slow charging at low rate. |
11. Through an electrolyte an electric current is due to the drift of
| A) | Free electrons |
| B) | Protons |
| C) | Free electrons and holes |
| D) | Positive and negative ions |
12. Sulphated cells are indicated by the
| A) | all of these answers |
| B) | low voltage on discharge. |
| C) | low capacity. |
| D) | low specific gravity. |
13. A floating battery is one
| A) | which is charged and discharged simultaneously. |
| B) | which supplies current intermittently and also during idle period gets charged. |
| C) | in which battery voltage is equal to charger voltage. |
| D) | none of these answers |
14. In which of the following cells polarisation is the major defect?
| A) | Lechlanche cell |
| B) | Daniel cell |
| C) | None of these answers |
| D) | Voltanic cell |
15. The current capacity of a cell is measured in
| A) | Wh |
| B) | W |
| C) | Ah |
| D) | A |
16. Nickel-cadmium accumulators in comparison to nickel-iron accumulators have the advantages of
| A) | being lighter in weight and cheaper in cost. |
| B) | higher emf and higher efficiency. |
| C) | low internal resistance and longer life. |
| D) | all of these answers |
17. Which of the following is not the name of a secondary cell?
| A) | Alkali cell |
| B) | Acid cell |
| C) | Storage cell |
| D) | Fuel cell |
18. Charging of a sulphated battery at high rate causes
| A) | all of these answers |
| B) | damage to separators, cell caps, covers and battery case due to excessive temperature. |
| C) | warping of plates. |
| D) | boiling of electrolyte owing to gassing. |
19. During charging and discharging of an Edison cell
| A) | corrosive fumes are produced. |
| B) | nickel hydroxide remains unsplit. |
| C) | emf remains the same. |
| D) | electrolyte does not take part in chemical reaction. |
20. First electrochemical cell was designed by
| A) | Faraday |
| B) | Galvani |
| C) | Lechlanche |
| D) | None of these answers |
21. Cells are connected in parallel in order to increase the
| A) | efficiency. |
| B) | life of the cells. |
| C) | current capacity. |
| D) | voltage rating. |
22. Common impurity in a battery electrolyte is
| A) | lead crystals. |
| B) | sodium chloride. |
| C) | iron. |
| D) | dust particles. |
23. In a battery, the cover is placed over the elements and sealed at the top of the battery container. This is done in order to
| A) | none of these answers |
| B) | exclude dirt and foreign matter from the electrolyte. |
| C) | both exclude dirt and foreign matter from the electrolyte and reduce evaporation of water from electrolyte. |
| D) | reduce evaporation of water from electrolyte. |
24. For a group of cells when the internal resistance of the group is equal to an external load resistance, the group will deliver maximum
| A) | current. |
| B) | efficiency. |
| C) | voltage. |
| D) | ampere-hours. |
25. What happens during the discharging of the Edison cell?
| A) | The emf does not change |
| B) | Relative density increases |
| C) | Relative density of electrolyte decreases |
| D) | The emf decreases |
26. The number of ions liberated by 96500 C of charge passed through the electrolyte is called ?
| A) | Electrochemical equivalent |
| B) | Chemical equivalent |
| C) | Gram equivalent |
| D) | None of these answers |
27. Overcharging of a lead-acid battery would cause
| A) | loss of active material. |
| B) | increase in temperature resulting in buckling of plates. |
| C) | excessive gassing. |
| D) | all of these answers |
28. What carries current in an electrolyte
| A) | + ve ions only |
| B) | – ve ions only |
| C) | Electrons only |
| D) | Both + ve and – ve ions |
29. Which of the following statements is incorrect about lead-acid batteries ?
| A) | The electrolyte in weak sulphuric acid. |
| B) | The number of plates is always odd. |
| C) | When fully charged both of the plates become lead-per-oxide. |
| D) | The number of negative plates is one more than the number of positive plates. |
30. Charging of a sulphated battery at high rate causes
| A) | warping of plates. |
| B) | all of these answers |
| C) | damage to separators, cell caps, covers and battery case due to excessive temperature. |
| D) | boiling of electrolyte owing to gassing. |
31. Addition of which of the following substances in electrolyte promotes smooth deposition?
| A) | Any of these answers |
| B) | Albumen. |
| C) | Phenol. |
| D) | Glucose. |
32. Pickling is
| A) | a layer coating for preventing surface deterioration. |
| B) | removal of scale, grease etc. from the surface. |
| C) | none of these answers |
| D) | protection of surface from rusting. |
33. Short circuiting of a cell results in
| A) | reduced gassing during charging. |
| B) | all of these answers |
| C) | abnormal high temperature. |
| D) | low specific gravity of the electrolyte. |
34. During electrode position the amounts of different substances liberated by same quantity of electricity are proportional to
| A) | valency. |
| B) | atomic numbers |
| C) | chemical equivalents. |
| D) | atomic weights. |
35. The energy capacity of a storage battery is rated in
| A) | kWh. |
| B) | kW. |
| C) | joules. |
| D) | ampere hours. |
36. Vent plug is provided in each lead-acid cell to
| A) | allow escape out of gases during charging. |
| B) | check the electrolyte level. |
| C) | pour water or electrolyte when needed. |
| D) | all of these answers |
37. Which of the following cells is more likely to be damaged due to short-circuiting ?
| A) | Acid cell |
| B) | Daniel cell |
| C) | Fuel cell |
| D) | Dry Cell |
38. A 24 V battery of internal resistance r = 4 ω connected to a variable resistance R.
The rate of heat dissipation in the resistor is maximum when the current drawn from the battery is I.
The current drawn from the battery will be 1/2 when R is equal to
| A) | 16 ω |
| B) | 8 ω |
| C) | 20 ω |
| D) | 12 ω |
39. Internal resistance of primary cell varies
| A) | all of these answers except inversely with the distance between electrodes. |
| B) | directly with the distance between electrodes |
| C) | with the nature of electrodes. |
| D) | inversely with the distance between electrodes. |
| E) | inversely with the surface area of electrodes. |
40. In comparison to constant current charging method, the constant voltage charging method of charging a lead acid battery has the advantage(s) of
| A) | reducing charging time. |
| B) | avoiding of excessive gassing. |
| C) | both reducing charging time and avoiding of excessive gassing. |
| D) | increasing capacity of the battery. |
41. Rust, scales and oxides can be removed from a surface with the help of
| A) | various acids. |
| B) | any of these answers |
| C) | mechanical abrasion. |
| D) | electrolytic cleaning |
| E) | alkali and salt solution. |
42. The emf of a lead battery
| A) | slightly increases with the increase in temperature. |
| B) | decreases with the increase in temperature. |
| C) | increases with the increase in specific gravity of the electrolyte. |
| D) | both increases with the increase in specific gravity of the electrolyte and slightly increases with the increase in temperature. |
43. For keeping the lead acid battery terminals free from corrosion it is advisable to
| A) | none of these answers |
| B) | apply petroleum jelly. |
| C) | charge the battery at frequent intervals. |
| D) | keep electrolyte level low |
44. Battery charging equipment should be installed
| A) | wherever convenient |
| B) | as near as practical to the battery under charge. |
| C) | both in well ventilated, clean and dry place and as near as practical to the battery under charge. |
| D) | in well ventilated, clean and dry place. |
45. Who was the first to design storage cell?
| A) | Plante |
| B) | Volta |
| C) | Galvani |
| D) | Edison |
46. The energy capacity of a storage battery is rated in
| A) | ampere-hours. |
| B) | kW. |
| C) | joules. |
| D) | kWh. |
47. Addition of which of the following substances in electrolyte promotes smooth deposition?
| A) | Any of these answers |
| B) | Glucose. |
| C) | Phenol. |
| D) | Albumen. |
48. For achieving a uniform thickness of deposit on irregular surface
| A) | anode and cathode are kept closer. |
| B) | electrolyte is agitated constantly |
| C) | anode and cathode are kept farther apart |
| D) | high current densities are used. |
49. The current capacity of the charged secondary cell does not depend on
| A) | Amount of active material |
| B) | Rate of discharge |
| C) | Rate of charging |
| D) | Temperature |
50. Standard cell
| A) | can supply voltages up to 10 V. |
| B) | will have precise and accurate constant voltage when few milliamperes are drawn from it. |
| C) | will continue to have constant voltage irrespective of loading conditions. |
| D) | will have precise and accurate constant voltage when current drawn from it is few microamperes only. |
51. Within the electric cell, the charge is transported by
| A) | Free electrons |
| B) | Only negative ions |
| C) | Both positive and negative ions |
| D) | Only positive ions |
52. The capacity of a lead acid battery is adversely affected by increase in
| A) | specific gravity of the electrolyte. |
| B) | discharge rate. |
| C) | temperature. |
| D) | charge rate. |
53. In a lead-acid battery, excessive formation of lead sulphate occurs due to
| A) | low level of electrolyte. |
| B) | all of these answers |
| C) | persistent undercharging. |
| D) | the idleness of battery for a long time. |
54. During electroplating the weight of a substance deposited depends upon
| A) | room temperature |
| B) | quantity of electricity |
| C) | shape of the article |
| D) | all of these answers |
55. In a lead-acid battery, fillers are provided to
| A) | prevent flow of gasses. |
| B) | facilitate flow of gasses |
| C) | recover acid losses through vapours. |
| D) | reduce tendency for polarisation. |
56. For a group of cells when the internal resistance of the group is equal to an external load resistance, the group will deliver maximum
| A) | current. |
| B) | voltage. |
| C) | ampere-hours. |
| D) | efficiency. |
57. Oil and grease can be removed from a surface with the help of
| A) | any of these answers |
| B) | solvents such as gasoline or carbon tetrachloride. |
| C) | hot alkaline solutions. |
| D) | soaps. |
58. In a lead-acid battery, the level of the electrolyte should be
| A) | above the level of plates. |
| B) | equal to that of the plates. |
| C) | none of these answers |
| D) | below the level of plates. |
59. If the specific gravity of the electrolyte in a lead-acid cell increases beyond 1.23 there will be
| A) | corrosion of the grids of the plate. |
| B) | loss of capacity. |
| C) | loss of life. |
| D) | increase in internal resistance. |
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