General Science - General Knowledge Questions and Answers

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The average salinity of sea water is

3.5%

2.5%

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When an iron nail gets rusted, iron oxide is formed

Without any change in the weight of the nail

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

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Galvanised iron sheets have a coating of

Lead

Chromium

Zinc

Tin

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Among the various allotrope of carbon

Coke is the hardest, graphite is the softest

Diamond is the hardest, coke is the softest

Diamond is the hardest, graphite is the softest

Diamond is the hardest, lamp black is the softest

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The group of metals Fe, Co, Ni may best called as:

Transition metals

Main group metals

Alkali metals

Rare metals

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Heavy water is:

Deuterium oxide

PH7

Rain water

Tritium oxide

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The chemical (Ethyl Mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of:

Bromine

Fluorine

Chlorine

Sulphur

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The element common to all acids is

Hydrogen

Carbon

Sulphur

Oxygen

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Non stick cooking utensils are coated with

Black paint

PVC

Teflon

polystyrene