A. photovoltaic effect
B. Ferranti effect
C. Skin effect
D. None of the above
Ans.: A
2 The _____ defined as the ration of ampere hours taken from the battery to the ampere hours supplied to it while charging.
A. Kilowatt hour
B. ampere-hour efficiency
C. energy
D. Both B and C
Ans.: B
3 The capacity of battery is measured in ____.
A. A-H
B. Volts
C. Watt-hour
D. All of the above
Ans.: A
4 Battery is a device which converts chemical energy into____.
A. mechanical energy
B. potential energy
C. electrical energy
D. Wind energy
Ans.: C
5 “The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity which passes through the electrolyte.” This statement is given by:
A. Gauss’s law
B. Faraday’s 1st laws of electrolysis
C. Faraday’s laws of electromagnetic induction
D. Fleming’s rule
Ans.: B
6 _____ is defined as the mass of its ions liberated at the electrode in one second when a constant current of one ampere passes through the electrolytic having that substance as one of the ions.
A. Electro-chemical-equivalent
B. Weight of the substance
C. mass of the substance
D. All of the above
Ans.: A
7 correct relation of faraday’s 1st law of electrolysis is___
A. ∆m = Z ∆q
B. ∆m = ZI ∆t
C. ∆m = Z / ∆q
D. Both A and B
Ans.: D
8 E.C.E of silver is equal to _____.
A. Zag = 1.118 x 10-16 kg C-1
B. Zag = 1.118 x 10-6 kg C-1
C. Zag = 0.1118 x 10-6 kg C-1
D. Zag = 11.18 x 10-6 kg C-1
Ans.: B
9 “If same charge is passed through different electrolysis then the masses of the substances
liberated at different electrodes are proportional to the chemical equivalent of the substances.” This statement is given by____.
A. Gauss’s law
B. Faraday’s 1st laws of electrolysis
C. Faraday’s laws of electromagnetic induction
D. Faraday’s 2nd laws of electrolysis
Ans.: D
10 Faraday’s constant is equal to the charge required to liberate the mass of substance at an electrode equal to its _______ during electrolysis.
A. Atomic weight
B. Atomic mass
C. chemical equivalent
D. all of the above
Ans.: C
11 Value of Faraday’s constant is equal to ______.
A. 96500 Coulomb
B. 95600 Coulomb
C. 9560 Coulomb
D. 9650 Coulomb
Ans.: A
12 One ampere of current is defined as that constant current which will deposit____ kg of silver at the cathode of Ag - voltmeter in one second.
A. 0.1118 x 10-6 kg
B. 1.118 x 10-6 kg
C. 11.18 x 10-6 kg
D. 1118 x 10-6 kg
Ans.: B
13 The plates of a lead acid battery are made of ____.
A. Cast animonial lead alloy
B. rolled zinc copper alloy
C. nickel cadmium alloy
D. None of the above
Ans.: A
13 The plates of a lead acid battery are made of ____.
A. Cast animonial lead alloy
B. rolled zinc copper alloy
C. nickel cadmium alloy
D. None of the above
Ans.: A
14 Separators are used in lead acid battery for the purpose of _____.
A. To facilitate flow of electrolyte
B. to avoid internal short circuit
C. to reduce internal resistance
D. All of the above
Ans.: B
Q. 15 ____ is used for container of a lead acid battery.
A. celluloid
B. ceramic
C. moulded hard rubber
D. Any of the above
Ans.: D
16 _____ is used to facilitate the flow of gasses in a lead acid battery.
A. Filter
B. Cap
C. electrolyte
D. None of the above
Ans.: A
17 In lead acid battery, during charging__.
A. the cell gives out energy
B. specific gravity of acid increase
C. voltage increase
D. All of the above
Ans.: B
18 When a lead acid battery is fully charge, the value of specific gravity of acid is____.
A. 1.10
B. 1.285
C. 12.85
D. 2.95
Ans.: B
19 During discharging of lead acid battery _____.
A. specific gravity of battery increase
B. voltage increases
C. both anode and cathode becomes PbSO4
D. None of the above
Ans.: C
20 _____ the active materials on the positive and negative plates of a fully charged lead acid
battery.
A. lead peroxide and pure lead
B. lead sulphate and lead oxide
C. lead oxide and lead peroxide
D. None of the above
Ans.: A
21 ______, the electrolyte of a lead acid battery becomes stronger.
A. During discharging
B. During charging
C. during pouring of electrolyte
D. all of the above
Ans.: B
A. To facilitate flow of electrolyte
B. to avoid internal short circuit
C. to reduce internal resistance
D. All of the above
Ans.: B
Q. 15 ____ is used for container of a lead acid battery.
A. celluloid
B. ceramic
C. moulded hard rubber
D. Any of the above
Ans.: D
16 _____ is used to facilitate the flow of gasses in a lead acid battery.
A. Filter
B. Cap
C. electrolyte
D. None of the above
Ans.: A
17 In lead acid battery, during charging__.
A. the cell gives out energy
B. specific gravity of acid increase
C. voltage increase
D. All of the above
Ans.: B
18 When a lead acid battery is fully charge, the value of specific gravity of acid is____.
A. 1.10
B. 1.285
C. 12.85
D. 2.95
Ans.: B
19 During discharging of lead acid battery _____.
A. specific gravity of battery increase
B. voltage increases
C. both anode and cathode becomes PbSO4
D. None of the above
Ans.: C
20 _____ the active materials on the positive and negative plates of a fully charged lead acid
battery.
A. lead peroxide and pure lead
B. lead sulphate and lead oxide
C. lead oxide and lead peroxide
D. None of the above
Ans.: A
21 ______, the electrolyte of a lead acid battery becomes stronger.
A. During discharging
B. During charging
C. during pouring of electrolyte
D. all of the above
Ans.: B
22 A _____ is one which supplies current intermittently and also during off cycle gets charged.
A. charging of a battery
B. discharging of a battery
C. floating battery
D. all of the above
Ans.: C
23 A _____ cell has the reversible chemical reaction.
A. carbon zinc
B. silver oxide
C. lead acid
D. Mercury oxide
Ans.: C
24 ______the electrolyte used in an Edison cell.
A. Hydrochloric acid
B. Potassium hydroxide
C. sodium chloride
D. None of the above
Ans.: B
25 Expected life of a lead acid battery is____.
A. 1 year
B. 5 year
C. 1.5year
D. 2 to 5 year
Ans.: D
26 When lead acid battery is fully charged, its E.M.F becomes___
A. 2.0V
B. 2.2 V
C. 1.95 V
D. Any of the above
Ans.: B
A. charging of a battery
B. discharging of a battery
C. floating battery
D. all of the above
Ans.: C
23 A _____ cell has the reversible chemical reaction.
A. carbon zinc
B. silver oxide
C. lead acid
D. Mercury oxide
Ans.: C
24 ______the electrolyte used in an Edison cell.
A. Hydrochloric acid
B. Potassium hydroxide
C. sodium chloride
D. None of the above
Ans.: B
25 Expected life of a lead acid battery is____.
A. 1 year
B. 5 year
C. 1.5year
D. 2 to 5 year
Ans.: D
26 When lead acid battery is fully charged, its E.M.F becomes___
A. 2.0V
B. 2.2 V
C. 1.95 V
D. Any of the above
Ans.: B
27 During charging of a lead acid battery the chemical reaction takes place at cathode and anode.
A. PbSO2 + → Pb + H2 SO4 and PbSO4 +SO4 +2H2 O → PbO2 + 2H2 SO4
B. PbSO2 + → Pb + H2 SO4 and PbSO4 +2H2 O → PbO2 + 2H2 SO4
C. PbSO2 + H2 → Pb + SO4 and PbSO4 +SO4 +2H2 O → PbO2 + H2 SO4
D. PbSO4 + H2 → Pb + H2 SO4 and PbSO4 +SO4 +2H2 O → PbO2 + 2H2 SO4
Ans.: D
28 During discharging of a lead acid battery the chemical reaction takes place at anode and
cathode.
A. PbO2 +H2 + H2 SO2 → PbSO2 + 2H2 O and Pb + SO2 → PbSO2
B. PbO2 + H2 SO4 → PbSO4 + 2H2 O and Pb + SO → PbSO
C. PbO2 +H2 + H2 SO4 → PbSO4 + 2H2 O and Pb + SO4 → PbSO4
D. PbO2 +H2 + SO4 → PbSO4 + 2H2 O and Pb + SO4 → PbSO4
A. PbSO2 + → Pb + H2 SO4 and PbSO4 +SO4 +2H2 O → PbO2 + 2H2 SO4
B. PbSO2 + → Pb + H2 SO4 and PbSO4 +2H2 O → PbO2 + 2H2 SO4
C. PbSO2 + H2 → Pb + SO4 and PbSO4 +SO4 +2H2 O → PbO2 + H2 SO4
D. PbSO4 + H2 → Pb + H2 SO4 and PbSO4 +SO4 +2H2 O → PbO2 + 2H2 SO4
Ans.: D
28 During discharging of a lead acid battery the chemical reaction takes place at anode and
cathode.
A. PbO2 +H2 + H2 SO2 → PbSO2 + 2H2 O and Pb + SO2 → PbSO2
B. PbO2 + H2 SO4 → PbSO4 + 2H2 O and Pb + SO → PbSO
C. PbO2 +H2 + H2 SO4 → PbSO4 + 2H2 O and Pb + SO4 → PbSO4
D. PbO2 +H2 + SO4 → PbSO4 + 2H2 O and Pb + SO4 → PbSO4
Ans.: C
29An Electrolyte used in lead acid battery is____.
A. Concentrated sulphuric acid
B. HCL
C. Dilute sulphuric acid
D. All of the above
Ans.: C
30 Secondary cells are also called_____.
A. accumulators
B. Storage cells
C. Both A and B
D. None of the above
Ans.: C
31 In Edison cell, the chemical changes during charging and discharging can be represented by the following reversible equation__.
A. Ni(OH)4 + KOH + Fe ↔ Ni(OH)2 + KOH + Fe (OH)2
B. Ni(OH)2 + KOH + Fe ↔ Ni(OH)2 + KOH + Fe (OH)2
C. Ni(OH)4 + KOH ↔ Ni(OH)2 + KOH + Fe (OH)2
D. Ni(OH) + KOH + Fe ↔ Ni(OH) + KOH + Fe (OH)
Ans.: A
32 When Edison cell is fully charged, the value of voltage becomes _____ v.
A. 1.2
B. 1.75
C. 1.3
D. 1.4
Ans.: B
33 In Edison cell value of voltage falls to___ volt after it gets discharged.
A. 1.2
B. 2.2
C. 1.75
D. 1.00
Ans.: A
34 Internal resistance of a battery is due to ____.
A. resistance of electrode
B. resistance of electrolyte
C. surface contact resistance
D. All of the above
Ans.: D
35 Emf of a storage battery is depends upon
A. nature of electrodes
B. size of the electrodes
C. shape of the cell
D. All of the above
Ans.: A
36 A wet battery cover in case of lead acid battery indicates__
A. leaky seal cover
B. excessive gassing during charging
C. overfilling of the battery
D. All of the above
Ans.: D
37 The internal resistance of a dry cell is of order of ____.
A. 2 to 5 ohms
B. 0.2 to 0.4 ohms
C. 0.5 to 1 ohms
D. None of the above
Ans.: B
38 The efficiency of a lead acid battery is in the range of___%.
A. 70 to 85
B. 90 to 95
C. 50 to 70
D. 40 to 50
Ans.: A
39 which of the following is/are primary cell?
A. Daniel cell
B. Leclanche cell
C. Bunsen cell and Fuel cell
D. All of the above
Ans.: D
40 _____cell in which electrochemical reactions are not revesible.
A. Secondary cell
B. Primary cell
C. Both A and B
D. none of the above
Ans.: B
41_____ is used as electrolyte in a Leclanche cell.
A. Aqueous solution of ammonium chloride
B. dilute HCL
C. lead stearate
D. dilute Sulphuric acid
Ans.: A
42 The electrode for a battery must be___.
A. a bad conductor of electricity
B. a bad conductor of electricity
C. an insulator
D. good conductor of heat
Ans.: B
Q. 43 The specific gravity of a discharged lead-acid battery is___.
A. 1.12
B. .08
C. 1.5
D. 2.0
Ans.: A
44 which of the following battery, a Trickle charge is required.
A. nickel iron cells
B. lead acid batteries
C. Lithium cells
D. All of the above
Ans.: D
45 ____ the best indication of the state of charge of a battery.
A. temperature of electrolyte
B. Specific gravity of electrolyte
C. level of electrolyte
D. colour of electrolyte
Ans.: A
46 ____ is a common impurity in electrolyte of a battery.
A. lead suphate
B. dust
C. iron
D. sodium chloride
Ans.: C
47 _______ when water is added to sulphuric acid.
A. acid particles get separated
B. colour of acid changes
C. water starts boiling
D. A lot of heat is generated
Ans.: D
A. 1.2
B. 1.75
C. 1.3
D. 1.4
Ans.: B
33 In Edison cell value of voltage falls to___ volt after it gets discharged.
A. 1.2
B. 2.2
C. 1.75
D. 1.00
Ans.: A
34 Internal resistance of a battery is due to ____.
A. resistance of electrode
B. resistance of electrolyte
C. surface contact resistance
D. All of the above
Ans.: D
35 Emf of a storage battery is depends upon
A. nature of electrodes
B. size of the electrodes
C. shape of the cell
D. All of the above
Ans.: A
36 A wet battery cover in case of lead acid battery indicates__
A. leaky seal cover
B. excessive gassing during charging
C. overfilling of the battery
D. All of the above
Ans.: D
37 The internal resistance of a dry cell is of order of ____.
A. 2 to 5 ohms
B. 0.2 to 0.4 ohms
C. 0.5 to 1 ohms
D. None of the above
Ans.: B
38 The efficiency of a lead acid battery is in the range of___%.
A. 70 to 85
B. 90 to 95
C. 50 to 70
D. 40 to 50
Ans.: A
39 which of the following is/are primary cell?
A. Daniel cell
B. Leclanche cell
C. Bunsen cell and Fuel cell
D. All of the above
Ans.: D
40 _____cell in which electrochemical reactions are not revesible.
A. Secondary cell
B. Primary cell
C. Both A and B
D. none of the above
Ans.: B
41_____ is used as electrolyte in a Leclanche cell.
A. Aqueous solution of ammonium chloride
B. dilute HCL
C. lead stearate
D. dilute Sulphuric acid
Ans.: A
42 The electrode for a battery must be___.
A. a bad conductor of electricity
B. a bad conductor of electricity
C. an insulator
D. good conductor of heat
Ans.: B
Q. 43 The specific gravity of a discharged lead-acid battery is___.
A. 1.12
B. .08
C. 1.5
D. 2.0
Ans.: A
44 which of the following battery, a Trickle charge is required.
A. nickel iron cells
B. lead acid batteries
C. Lithium cells
D. All of the above
Ans.: D
45 ____ the best indication of the state of charge of a battery.
A. temperature of electrolyte
B. Specific gravity of electrolyte
C. level of electrolyte
D. colour of electrolyte
Ans.: A
46 ____ is a common impurity in electrolyte of a battery.
A. lead suphate
B. dust
C. iron
D. sodium chloride
Ans.: C
47 _______ when water is added to sulphuric acid.
A. acid particles get separated
B. colour of acid changes
C. water starts boiling
D. A lot of heat is generated
Ans.: D
48 The energy in a lead acid battery is stored in the form of _____.
A. potential energy
B. Electrostatic charge
C. Chemical energy
D. heat energy
Ans.: C
Q. 49 The watt-hour efficiency is defined as follows:
A. AH efficiency x Average cell voltage while discharging /Average cell voltage while charging
B. AH efficiency x Average cell voltage while charging / Average cell voltage while discharging
C. Average cell voltage while charging x Average cell voltage while discharging / Average cell voltage while charging
D. None of the above
Ans.: A
50 Which of the following points should be considered while charging of a battery?
A. A source should be used for charging
B. The DC source voltage should be higher than the maximum terminal voltage of the battery.
C. The DC source should be connected with proper polarities to the battery.
D. All of the above
Ans.: D
51 What precautions should be taken during charging of a battery?
A. Keep the vents open so as to allow the hydrogen and oxygen to escape
B. Add water after charging in order to compensate for the loss of water due to gassing.
C. Set the charging current such that the battery temperature remains below 40 ºC when the battery is being charged.
D. All of the above
Ans.: D
52 For a group of cells when internal resistance of the group is equal to the external resistance due to load, the battery will delivered____.
A. Maximum ampere-hour
B. maximum energy
C. maximum current
D. Maximum voltage
Ans.: C
53 The _____of acid is checked by hydrometer.
A. Specific resistance
B. Specific gravity
C. specific conductivity
D. none of the above
Ans.: B
54 Cells are connected in parallel to_____.
A. potential energy
B. Electrostatic charge
C. Chemical energy
D. heat energy
Ans.: C
Q. 49 The watt-hour efficiency is defined as follows:
A. AH efficiency x Average cell voltage while discharging /Average cell voltage while charging
B. AH efficiency x Average cell voltage while charging / Average cell voltage while discharging
C. Average cell voltage while charging x Average cell voltage while discharging / Average cell voltage while charging
D. None of the above
Ans.: A
50 Which of the following points should be considered while charging of a battery?
A. A source should be used for charging
B. The DC source voltage should be higher than the maximum terminal voltage of the battery.
C. The DC source should be connected with proper polarities to the battery.
D. All of the above
Ans.: D
51 What precautions should be taken during charging of a battery?
A. Keep the vents open so as to allow the hydrogen and oxygen to escape
B. Add water after charging in order to compensate for the loss of water due to gassing.
C. Set the charging current such that the battery temperature remains below 40 ºC when the battery is being charged.
D. All of the above
Ans.: D
52 For a group of cells when internal resistance of the group is equal to the external resistance due to load, the battery will delivered____.
A. Maximum ampere-hour
B. maximum energy
C. maximum current
D. Maximum voltage
Ans.: C
53 The _____of acid is checked by hydrometer.
A. Specific resistance
B. Specific gravity
C. specific conductivity
D. none of the above
Ans.: B
54 Cells are connected in parallel to_____.
A. to increase the current capacity
B. to increase the voltage output
C. to increase the power capacity
D. to decrease the internal resistance
Ans.: A.
55 The terminal voltage decrease with_____, when the battery being charged.
A. increase the state of charge
B. increasing charging rate
C. increasing temperature
D. any of the above
Ans.: C
56 which of the following is common voltage of automobile batteries?
A. 10V
B. 12V
C. 15V
D.2.2V
Ans.: B
57 The ampere-hour capacity of a battery used in trucks is____.
A. 100-150Ah
B. 50-60Ah
C. 200-300Ah
D. 10- 20Ah
Ans.: A
58 _____ test is used to ascertain whether the battery plates are defective or not.
A. open voltage test
B. specific gravity test
C. Cadmium test
D. high discharge test
Ans.: C
59 _____ battery is used in aero planes.
A. lead acid battery
B. Dry cell battery
C. Edison cell
D. None of the above
Ans.: D
60 A constant voltage source has
A. high internal resistance
B. low internal resistance
C. minimum current rating
D. all of the above
Ans.: B
61 Cells are connected in series to___
A. increase current capacity
B. increase voltage output
C. decrease current capacity
D. increase internal resistance
Ans.: B
62 Which of the following is dry cell?
A. carbon-zinc cell
B. Edison cell
C. Mercury cell
D. Nickel-cadmium cell
Ans.: D
63 Two batteries having unequal EMF___.
A. cannot be connected in series
B. can be connected in series only
C. can be connected in parallel
D. Any of the above combination
Ans.: B
64 Due to internal chemical reaction, the stored energy in batteries is reduced without any load connection between the terminals of a battery. This phenomenon is called as_____.
A. Self discharging rate
B. Self charging rate
C. Uses of a battery
D. Any of the above.
Ans.: A
65 Self discharging rate can be reduced, if the batteries are stored at____.
A. High enough temperature
B. low enough temperature
C. Both A and B
D. None of the above
Ans.: B
66 Batteries can get damaged due to_____.
A. freezing
B. charging
C. Discharging
D. all of the above
Ans.: A
67 NiCd batteries are almost always _____ when purchased and must be _____first use.
A. Charged, dead
B. Dead, charged
C. charged, discharge
D. any of the above
Ans.: B
68 High capacity batteries like NiMH (2500 mAh above) can be charged for about _____ cycles,
that of low capacity batteries like Nickel Metal Hydride (1700-200mAh) can be charged for about
_____ cycles.
A. 250, 500
B. 1000, 500
C. 500, 1000
D. 250, 750
Ans.: C
69 Degradation of a battery is usually occurs because of_____.
A. electrolyte migrates away from the electrodes
B. active materials fall of the electrodes
C. generation of gasses at the time of charging
D. Both A and B
Ans.: D
70 Hydrogen gas is liberated at _____in a lead acid battery.
A. positive plates
B. negative plates
C. during discharging
D. all of the above
Ans.: B
71 PbSO4 is formed during____ in a lead acid battery.
A. during discharging
B. during charging
C. during pouring of electrolyte
D. any of the above
Ans.: A.
A. Self discharging rate
B. Self charging rate
C. Uses of a battery
D. Any of the above.
Ans.: A
65 Self discharging rate can be reduced, if the batteries are stored at____.
A. High enough temperature
B. low enough temperature
C. Both A and B
D. None of the above
Ans.: B
66 Batteries can get damaged due to_____.
A. freezing
B. charging
C. Discharging
D. all of the above
Ans.: A
67 NiCd batteries are almost always _____ when purchased and must be _____first use.
A. Charged, dead
B. Dead, charged
C. charged, discharge
D. any of the above
Ans.: B
68 High capacity batteries like NiMH (2500 mAh above) can be charged for about _____ cycles,
that of low capacity batteries like Nickel Metal Hydride (1700-200mAh) can be charged for about
_____ cycles.
A. 250, 500
B. 1000, 500
C. 500, 1000
D. 250, 750
Ans.: C
69 Degradation of a battery is usually occurs because of_____.
A. electrolyte migrates away from the electrodes
B. active materials fall of the electrodes
C. generation of gasses at the time of charging
D. Both A and B
Ans.: D
70 Hydrogen gas is liberated at _____in a lead acid battery.
A. positive plates
B. negative plates
C. during discharging
D. all of the above
Ans.: B
71 PbSO4 is formed during____ in a lead acid battery.
A. during discharging
B. during charging
C. during pouring of electrolyte
D. any of the above
Ans.: A.
72 Due to ______of the current flow through electrolyte.
A. movement of proton
B. movement of electron
C. movement of ions
D. all of the above
Ans.: C
73 When the internal resistance of a battery is high compared to the external resistance in the circuit then high current can flow through the external resistance by grouping of cells___.
A. in parallel
B. in series
C. series-parallel
D. Any of the above
Ans.: A
74 The lesser the terminal voltage, the ______ the _____ resistance of the cell.
A. less, external
B. Greater, external
C. less, internal
D. greater, internal
Ans.: D
75 Due to _______ the plates of the lead acid battery are most likely to be short circuited.
A. sediments collect at the bottom of the battery
B. during pouring of electrolytes
C. generation of heat
D. any of the above
Ans.: A
76 Electrolyte used for silver plating is____.
A. dilute sulphuric acid
B. double cynide of silver and potassium solution
C. PbSO4
D. Any of the above
Ans.: B
77 Which of the following law find its application is electrolysis.
A. Faraday’s law
B. Ohm’s law
C. Lenz’s law
D. Kirchhoff’s law
Ans.: A
78 During electroplating the weight of a substance deposited depends on____.
A. Shape of article
B. type of electrolytes
C. quantity of electricity passed through the electrolyte
D. None of the above
Ans.: C
79 The deposition of superior or noble metal on an inferior or a lease metal by means of electrolysis of an aqueous solution of suitable electrolyte is called______.
A. emission of electron
B. Electroplating
C. electric conduction
D. All of the above
Ans.: B
80 Which of the following factors affect the electroplating?
A. current density
B. concentration of electrolyte
C. temperature
D. All of the above
Ans.: D
81 A factors affecting electroplating is / are____.
A. nature of electrolyte
B. nature of electrolyte on which deposit is to be made
C. Both A and B
D. none of the above
Ans.: B
82 _____ is the process by which the production of metal on conducting base for decoration and for protective purposes.
A. Electroplating
B. electro policing
C. Electro facing
D. Any of the above
Ans.: C
83 ______ is the process of applying a protective zinc coating to steel or iron, to prevent rusting.
A. Galvanizing
B. Electroplating
C. electroforming
D. All of the above
Ans.: A
84 The hydrogen and oxygen gas is obtained by ____ of___.
A. Water, electrolysis
B. Electrolysis, water
C. electrolysis, electroplating
D. none of the above
Ans.: B
85 Which of the following is an expression of electro-chemical equivalent?
A. milligrams per kW
B. milligrams per coulombs
C. milligrams per volt
D. any of the above
Ans.: B
86 Galvanizing is coating of____.
A. gold
B. tin
C. lead
D. zinc
Ans.: D
87 During electroplating, energy efficiency is in the order of ___%.
A. 80 to 95
B. 50 to 80
C. 70 to 85
D. 80 to 95
Ans.: B
88 _____ is the best instrument for the measurement of emf of a cell.
A. Ammeter
B. Potentiometer
C. voltmeter
D. energy meter
Ans.: B
89 ______ solution is consists of Zinc, sodium cyanide and sodium hydroxide solution.
A. Zinc plating
B. chromium plating
C. copper plating
D. all of the above
Ans.: A
90 _______in electroplating is usually 90 to 98 %.
A. energy efficiency
B. current efficiency
C. Both A and B
D. None of the above
Ans.: B
91The current is maximum when an external resistance R is connected to a cell of internal resistance r is____.
A. R = r
B. R˂ r
C. R˃ r
D. all of the above
Ans.: A
92 Which of the following metals are generally deposited for protection?
A. dilute sulphuric acid
B. double cynide of silver and potassium solution
C. PbSO4
D. Any of the above
Ans.: B
77 Which of the following law find its application is electrolysis.
A. Faraday’s law
B. Ohm’s law
C. Lenz’s law
D. Kirchhoff’s law
Ans.: A
78 During electroplating the weight of a substance deposited depends on____.
A. Shape of article
B. type of electrolytes
C. quantity of electricity passed through the electrolyte
D. None of the above
Ans.: C
79 The deposition of superior or noble metal on an inferior or a lease metal by means of electrolysis of an aqueous solution of suitable electrolyte is called______.
A. emission of electron
B. Electroplating
C. electric conduction
D. All of the above
Ans.: B
80 Which of the following factors affect the electroplating?
A. current density
B. concentration of electrolyte
C. temperature
D. All of the above
Ans.: D
81 A factors affecting electroplating is / are____.
A. nature of electrolyte
B. nature of electrolyte on which deposit is to be made
C. Both A and B
D. none of the above
Ans.: B
82 _____ is the process by which the production of metal on conducting base for decoration and for protective purposes.
A. Electroplating
B. electro policing
C. Electro facing
D. Any of the above
Ans.: C
83 ______ is the process of applying a protective zinc coating to steel or iron, to prevent rusting.
A. Galvanizing
B. Electroplating
C. electroforming
D. All of the above
Ans.: A
84 The hydrogen and oxygen gas is obtained by ____ of___.
A. Water, electrolysis
B. Electrolysis, water
C. electrolysis, electroplating
D. none of the above
Ans.: B
85 Which of the following is an expression of electro-chemical equivalent?
A. milligrams per kW
B. milligrams per coulombs
C. milligrams per volt
D. any of the above
Ans.: B
86 Galvanizing is coating of____.
A. gold
B. tin
C. lead
D. zinc
Ans.: D
87 During electroplating, energy efficiency is in the order of ___%.
A. 80 to 95
B. 50 to 80
C. 70 to 85
D. 80 to 95
Ans.: B
88 _____ is the best instrument for the measurement of emf of a cell.
A. Ammeter
B. Potentiometer
C. voltmeter
D. energy meter
Ans.: B
89 ______ solution is consists of Zinc, sodium cyanide and sodium hydroxide solution.
A. Zinc plating
B. chromium plating
C. copper plating
D. all of the above
Ans.: A
90 _______in electroplating is usually 90 to 98 %.
A. energy efficiency
B. current efficiency
C. Both A and B
D. None of the above
Ans.: B
91The current is maximum when an external resistance R is connected to a cell of internal resistance r is____.
A. R = r
B. R˂ r
C. R˃ r
D. all of the above
Ans.: A
92 Which of the following metals are generally deposited for protection?
A. Tin
B. Nickel
C. Zinc
D. all of the above
Ans.: D
93 For smooth deposition, which of the following substance is added to electrolyte?
A. Albumen
B. Glucose
C. Gelatin
D. Any of the above
Ans.: D
94 Charging methods of batteries are____.
A. constant voltage method
B. constant current method
C. Both A and B
D. None of the above
A. constant voltage method
B. constant current method
C. Both A and B
D. None of the above
Ans.: C
95 When the battery is being charged for the first time or when it is used after a long time_______ mode is used.
A. constant current charging
B. constant power charging
C. Boost charging
D. Any of the above
Ans.: C
96 ____ can be take place if the battery is left uncharged for a long time or over charged.
A. Sulphation
B. Degradation of electrode
C. Reduction of electrolyte
D. Drying of a battery
Ans.: A
97 The effects of Sulphation is/are:
A. Reduction in the capacity
B. increase in the internal resistance
C. Reduction in the efficiency
D. All of the above
Ans.: D
98 The capacity of a battery is reduces due to aging effect. This effect is due to the loss of the
____.
A. active material
B. electrolyte
C. over charging
D. Any of the above
Ans.: A
99 When n number of identical cells, each of emf E and internal resistance r, connected in series across an external resistance R. The current flowing through the circuit is____.
A. I = total emf / total resistance
B. I = total resistance/ total emf
C. I = total inductance/ total emf
D. none of the above
Ans.: A
100 Correct relation of current through the cell when n number of cells is connected in series.
A. I = nE/ R+nr
B. I = R + nr/ nE
C. I = R + nE/nr
D. I = nE + nr/R
Ans.: A
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