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Electrolysis and Storage Batteries

Electrolysis and Storage Batteries
In order that a hydrometer may float vertically in electrolyte its C.G. should be

undisturbed
displaced sideways
lowered
raised

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Electrolysis and Storage Batteries
The active materials of a nickel-iron battery are

21% solution of kOH
powdered iron and its oxide
all of these
nickel hydroxide

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Electrolysis and Storage Batteries
Which of the following is incorrect?

A lead-acid cell can be recharged
A carbon-zinc cell has unlimited shelf life
A storage cell has a reversible chemical reaction
A primary cell has an irreversible chemical reaction

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Electrolysis and Storage Batteries
Mercury cell has which of the following characteristics?

High power to weight ratio
Comparatively longer shelf life under adverse conditions of high temperature and humidity
All of these
Flat discharge current-voltage curve

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Electrolysis and Storage Batteries
Internal short circuits are caused by

excess accumulation of sediment at the bottom of the cell
both of the options given here
none of the listed here
breakdown of one or more separators

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Electrolysis and Storage Batteries
When the lead-acid cell is fully charged, the electrolyte assumes _____ appearance

dull
reddish
milky
bright

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