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General Science

General Science
In fireworks, the green flame is produced because of

Potassium
Mercury
Barium
Sodium

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General Science
Nautical mile is a unit of distance used in:

Road mile
Astronomy
Navigation
Measuring the boundaries of a nation

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General Science
Gypsum is added to cement clinker to

Facilitate the formation of colloidal gel
Decrease the rate of setting of cement
Bind the particles of calcium silicate
Increase the tensile strength of cement

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General Science
In which of the following activities silicon carbide is used?

Disinfecting water of ponds
Making cement and glass
Cutting very hard substances
Making casts for statues

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General Science
The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is

Argon
Xenon
Helium
Krypton

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General Science
When an iron nail gets rusted, iron oxide is formed

With decrease in the weight of the nail
With increase in the weight of the nail
Without any change in colour or weight of the nail
Without any change in the weight of the nail

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