## electrical

### Electrolysis and Storage Batteries MCQ With Answers Page - 1

1.
 The mass of an ion liberated at an electrode is directly proportional to the quantity of electricity”. The above statement is associated with A Newton’s law B Faraday’s law of electromagnetic induction C Faraday’s law of electrolysis D Gauss’s law Answer : C Explanation :
2.
 The charge required to liberate one-gram equivalent of any substance is known as ………. Constant A Time B Faraday’s C Boltzmann D Faraday’s and Boltzmann Answer : B Explanation :
3.
 The capacity of a cell is measured in A Amperes B Ampere-hours C Watts D Watt-hours Answer : B Explanation :
4.
 Active materials of a lead acid cell are A Spongy lead B Lead peroxide C Dilute H2SO4 D All of the above Answer : D Explanation :
5.
 Sulphation in a lead-acid battery occurs due to A Heavy charging B Fast charging C Trickle charging D Incomplete charging Answer : D Explanation :
6.
 During the charging of lead-acid cell A Its voltage increases B It gives out energy C Its cathode becomes dark chocolate brown colour D Specific gravity of H2SO4 decreases Answer : A Explanation :
7.
 The capacity of lead acid cell does not depend upon its A Temperature B Rate of charge C Rate of discharge D Quantity of active materials Answer : B Explanation :
8.
 During charging the specific gravity of electrolyte of a lead-acid battery A Increase B Decreases C Remains the same D Becomes zero Answer : A Explanation :
9.
10.
 When a lead-acid battery is in fully charged condition, the colour of its positive plate is A Dark grey B Brown C Dark brown D None of the above Answer : C Explanation :
11.
 The active materials of nickel-iron battery are A Nickel hydroxide B Powered iron and its oxide C 21 % solution of KOH D All of the above Answer : D Explanation :
12.
 The ratio of ampere-hour efficiency to watt-hour efficiency of a lead-acid cell is A Just one B Always greater than one C Always less than one D None of the above Answer : B Explanation :
13.
 The best indication about the state of charge on a lead-acid battery is given by A Output voltage B Temperature of electrolyte C Specific gravity of electrolytes D None of the above Answer : C Explanation :
14.
 The storage battery generally used in electric power station is A Nickel cadmium battery B Zinc-carbon battery C Lead-acid battery D None of the above Answer : C Explanation :
15.
 The output voltage of a charger is A Less than the battery voltage B Higher than the battery voltage C The same as battery voltage D None of the above Answer : B Explanation :
16.
 Cells are connected in series in order to A Increase the voltage rating B Increase the current rating C Increase the life of the cells D None of the above Answer : A Explanation :
17.
 Five 2 v cells are connected in parallel. The output voltage is A 1 V B 1.5 V C 1.75 V D 2 V Answer : D Explanation :
18.
 The capacity of a battery is expressed in terms of A Current rating B Voltage rating C Ampere-hour rating D None of the above Answer : C Explanation :
19.
 During the charging and discharging of a nickel-iron cell A Corrosive fumes are produced B Water is neither formed nor absorbed C Nickel hydroxide remains up splits D Its e.m.f remains constant Answer : B Explanation :
20.
 As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of A Reducing time charging B Increasing cell capacity C Both (a) and (b) D Avoiding excessive gassing Answer : C Explanation :
21.
 A dead storage battery can be revived by A Adding distilled water B Adding so-called battery restorer C A dose of H2SO4 D None of the above Answer : D Explanation :
22.
 As compared to a lead-acid cell, the efficiency of a nickel-iron cell is less due to its A Compactness B Lower e.m.f C Smaller quantity of electrolyte used D Higher internal resistance Answer : D Explanation :
23.
 Trickle charging of a storage battery helps to A Maintain proper electrolyte level B Increase its reserve capacity C Prevent sulphation D Keep it fresh and fully charged Answer : D Explanation :
24.
 Those substance of the cell which take active parts in chemical combination and hence produce electricity during charging and discharging are known as ……… materials A Passive B Active C Redundant D Inert Answer : B Explanation :
25.
 In a lead-acid cell dilute sulphuric acid (electrolyte) approximately comprises the following A One part of H2O, three parts H2SO4 B Two parts H2O, two parts of H2SO4 C Three parts H2O, one-part H2SO4 D All H2SO4 Answer : C Explanation :
26.
 It is noticed that during charging A There is a rise in voltage and Energy is absorbed by the cell B Specific gravity of h2SO4 is increased C The anode becomes chocolate brown in colour (PbO2) and cathode becomes grey metallic lead (Pb) D All above Answer : D Explanation :
27.
 It is noticed that during discharging the following does not happen A Bath anode and cathode become PbSO4 B Specific gravity of H2SO4 decreases C Voltage of the cell decreases D The cell absorbs energy Answer : D Explanation :
28.
 The ampere-hour efficiency of a lead acid cell is normally between A 20 to 30 % B 40 to 50 % C 60 to 70 % D 90 to 95 % Answer : D Explanation :
29.
 The watt-hour efficiency of a lead-acid cell varies between A 25 to 35 % B 40 to 60 % C 70 to 80 % D 90 to 95 % Answer : C Explanation :
30.
 The capacity of a lead acid cell measured in A Amperes B Amperes-hours C Watts D Watt-hours Answer : B Explanation :
31.
 The capacity of a lead-acid cell deepens on A Rate of discharge and Temperature B Density of electrode C Quantity of active materials D All above Answer : D Explanation :
32.
 When the lead acid cell is fully charged the electrolytes assumes ……. Appearance A Dull B Reddish C Bright D Milky Answer : D Explanation :
33.
 The e.m.f of an Edison cell, when fully charged is nearly A 1.4 V B 1 V C 0.9 V D 0.8 V Answer : A Explanation :
34.
 The internal resistance of an alkali cell is nearly ……. Times that of the lead-acid cell A Two B Three C Four D Five Answer : D Explanation :
35.
 The average charging voltage for alkali cell is about A 1 V B 1.2 V C 1.7 V D 2 V Answer : C Explanation :
36.
 On the average the ampere-hour efficiency of an edition cell is about A 40 % B 60 % C 70 % D 80 % Answer : D Explanation :
37.
 The active material of the positive plates of silver-zinc batteries is A Silver oxide B Lead oxide C Lead D Zinc powder Answer : A Explanation :
38.
 Lead-acid cell has a life of nearly …….. charges and discharges A 500 B 700 C 1000 D 1250 Answer : D Explanation :
39.
 Life of the Edison cell is at least A Five years B Seven years C Eight years D Ten years Answer : A Explanation :
40.
 The internal resistance of a lead-acid cell is …… that of Edison cell A Less than B More than C Equal to D None of the above Answer : A Explanation :