1. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is
[a] Argon
[b] Xenon
[c] Helium
[d] Krypton
2. The gases used in different types of welding would include
[a] oxygen and hydrogen
[b] oxygen, hydrogen, acetylene and nitrogen
[c] oxygen, acetylene and argon
[d] oxygen and acetylene
3. The property of a substance to absorb moisture from the air on exposure is called
[a] osmosis
[b] deliquescence
[c] efflorescence
[d] desiccation
4. In which of the following activities silicon carbide is used?
[a] Making cement and glass
[b] Disinfecting water of ponds
[c] cutting very hard substances
[d] Making casts for statues
5. The average salinity of sea water is
[a] 3%
[b] 3.5%
[c] 2.5%
[d] 2%
6. When an iron nail gets rusted, iron oxide is formed
[a] without any change in the weight of the nail
[b] with decrease in the weight of the nail
[c] with increase in the weight of the nail
[d] without any change in colour or weight of the nail
7. Galvanised iron sheets have a coating of
[a] lead
[b] chromium
[c] zinc
[d] tin
8. Among the various allotropes of carbon,
[a] coke is the hardest, graphite is the softest
[b] diamond is the hardest, coke is the softest
[c] diamond is the hardest, graphite is the softest
[d] diamond is the hardest, lamp black is the softest
9. The group of metals Fe, Co, Ni may best called as
[a] transition metals
[b] main group metals
[c] alkali metals
[d] rare metals
10. Heavy water is
[a] deuterium oxide
[b] PH7
[c] rain water
[d] tritium oxide
11. The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of
[a] bromine
[b] fluorine
[c] chlorine
[d] sulphur
12. The element common to all acids is
[a] hydrogen
[b] carbon
[c] sulphur
[d] oxygen
13. Non stick cooking utensils are coated with
[a] Teflon
[b] PVC
[c] black paint
[d] polystyrene
14. Monazite is an ore of
[a] titanium
[b] zirconium
[c] iron
[d] thorium
15. Carbon, diamond and graphite are together called
[a] allotropes
[b] isomers
[c] isomorphs
[d] isotopes
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