electrolysis and storage of batteries MCQs – Page 5

Practise focused electrolysis and storage of batteries questions with marked answers for exam preparation and subject revision.

electrolysis and storage of batteries Mcqs
81. Hydrogen evolved during charging produces explosive mixture when it is more than___________?
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A. 4%

B. 8%

C. 6%

D. 2%

82. Which of the following battery is used for air-craft _____________?
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A. Nickel-iron battery

B. Lead-acid battery

C. Dry cell battery

D. Silver oxide battery

83. Dry cell is modification of____________?
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A. Edison cell

B. Lead-acid cell

C. Deniell cell

D. Leclanche cell
84. In constant voltage charging method, the charging current from discharged to fully charged condition_____________?
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A. decreases

B. remains constant

C. none of the above

D. increases

85. The internal resistance of an alkali cell is nearly _________ times that of the lead-acid cell
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A. four

B. two

C. five

D. three

86. Negative plate of an Edison cell is made of__________?
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A. silver oxide

B. copper

C. iron

D. lead

87. All the electrical connections between the battery and vehicle should be by____________?
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A. flexible cables

B. thin copper wires

C. rigid cables

D. thin aluminium wires

88. Internal resistance of a cell is due to___________?
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A. surface contact resistance between electrode and electrolyte

B. resistance of electrolyte

C. all above

D. electrode resistance

89. Short circuiting of a cell may be caused____________?
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A. faulty separators

B. excessive accumulation of sediment

C. buckling of plates

D. any one of above

E. lead particles forming circuit between positive and negative plates

90. Which of the following primary cells has the highest voltage___________ ?
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A. Lithium

B. Manganese-alkaline

C. Mercury

D. Carbon-zinc

91. The average charging voltage for alkali cell is about__________?
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A. 1.2 V

B. 2.1 V

C. 1 V

D. 1.7 V
92. The watt-hour efficiency of a lead-acid cell varies between________?
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A. 90 to 95%

B. 25 to 35%

C. 40 to 60%

D. 70 to 80%
93. Weston standard cell at 20C has voltage of _______ volts
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A. 0.8

B. 1.5

C. 1.0187

D. 0.9

94. As compared to constant-current system, the constant-voltage system of charging a lead acid cell has the advantage of___________?
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A. reducing time of charging

B. increasing cell capacity

C. both (A) and (B)

D. avoiding excessive gassing

95. The charge required to liberate one gram equivalent of any substance is known as _________ constant
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A. Boltzman

B. Faradays

C. time

96. Over charging______________?
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A. all above

B. increases the temperature resulting in buckling of plates

C. produces excessive gassing

D. loosens the active material

97. The active material of the positive plates of silver-zinc batteries is_________?
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A. lead oxide

B. zinc powder

C. lead

D. silver oxide
98. Extent of corrosion in the underground metal work depends upon___________?
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A. type of metals

B. type of soil chemicals

C. all above factors

D. amount of moisture

99. The following indicate that battery on charge has attained full charge___________?
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A. all above

B. colour of electrode

C. gassing

D. specific gravity

100. Following will happen if battery charging rate is too high______________?
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A. temperature rise will occur

B. bulging and buckling of plates will occur

C. excessive gassing will occur

D. all above will occur