1. Potassium nitrate is used in
[a] medicine
[b] fertiliser
[c] salt
[d] glass
2. Permanent hardness of water may be removed by the addition of
[a] sodium carbonate
[b] alum
[c] potassium permanganate
[d] lime
3. Soda water contains
[a] carbonic acid
[b] sulphuric acid
[c] carbon dioxide
[d] nitrous acid
4. The most important ore of aluminium is
[a] galena
[b] calamine
[c] calcite
[d] bauxite
5. Most soluble in water is
[a] camphor
[b] sulphur
[c] common salt
[d] sugar
6. Which of the following was to be discovered first in the chromospheres of the sun?
[a] Krypton
[b] Xenon
[c] Neon
[d] Helium
7. Which of the following is in liquid form at room temperature?
[a] Lithium
[b] Sodium
[c] Francium
[d] Cerium
8. Sodium metal is kept under
[a] petrol
[b] alcohol
[c] water
[d] kerosene
9. Which of the following are the ingredients of gun metal?
[a] Iron, Zinc, Titanium
[b] Iron, tin
[c] Iron, Brass, Tin
[d] Copper, Tin
10. From which mineral is radium obtained?
[a] Rutile
[b] Haematite
[c] Limestone
[d] Pitchblende
11. What is laughing gas?
[a] Nitrous Oxide
[b] Carbon monoxide
[c] Sulphur dioxide
[d] Hydrogen peroxide
12. Actinides are the elements with atomic numbers from
[a] 97 to 104
[b] 101 to 115
[c] 89 to 103
[d] 36 from 43
13. The two elements that are frequently used for making transistors are
[a] boron and aluminium
[b] silicon and germanium
[c] iridium and tungsten
[d] niobium and columbium
14. The filament of an electric bulb is made of
[a] tungsten
[b] nichrome
[c] graphite
[d] iron
15. Diamond is an allotropic form of
[a] germanium
[b] carbon
[c] silicon
[d] sulphur
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