E-PolyLearning

1. Electricity is measured through a device called as
a. Ammeters
b. Voltmeters
c. Barometers
d. Anemometers
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Answer: (a).Ammeters

2. Any reaction at an anode involves
a. gain of electrons
b. loss of electrons
c. gain or loss depends upon the electrolyte
d. formation of gases
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Answer: (b).loss of electrons

3. Aluminum (Al) is preferred in overhead power cables because
a. it is a good conductor
b. it acts as an insulator, in case of lightening
c. it prevents accidents
d. it is lighter in weight
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Answer: (d).it is lighter in weight

4. Reactivity series of metals is also called as the
a. preferential series
b. electrochemical series
c. electrolytic series
d. selective discharge series
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Answer: (b).electrochemical series

5. If molten Lead Bromide (PbBr₂) is electrolyzed,
a. at anode, brown fumes of bromide gas are given off
b. at anode, molten lead can be seen
c. at cathode, brown fumes can be seen
d. at cathode, lead bromide can be seen
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Answer: (a).at anode, brown fumes of bromide gas are given off

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