G.K. Practice Test: Question Set - 03
1. 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
2. The most important ore of aluminium is
- (A) Galena
- (B) Calamine
- (C) Calcite
- (D) Bauxite
3. From which mineral is radium obtained?
- (A) Rutile
- (B) Haematite
- (C) Limestone
- (D) Pitchblende
4. Permanent hardness of water can be removed by adding
- (A) Chlorine
- (B) Washing soda
- (C) Potassium
permanganate
- (D) Bleaching
powder
5. Which of the following does not contain a coinage metal?
- (A) Silver
and Gold
- (B) Zinc
and Gold
- (C) Copper
and Silver
- (D) Copper and
Gold
6. Amalgams are
- (A) Highly colored alloys
- (B) Alloys
which contain mercury as one of the contents
- (C) Alloys
which have great resistance to abrasion
- (D) Alloys
which contain carbon
7. Brass gets discolored in air because of the presence of which of the following gases in air?
- (A) Oxygen
- (B) Hydrogen
sulphide
- (C) Carbon
dioxide
- (D) Nitrogen
8. Which of the following is used in pencils?
- (A) Graphite
- (B) Silicon
- (C) Charcoal
- (D) Phosphorous
9. Washing soda is the common name for
- (A) Sodium
carbonate
- (B) Calcium
bicarbonate
- (C) Sodium
bicarbonate
- (D) Calcium
carbonate
10. Tetraethyl lead is used as
- (A) Pain killer
- (B) Fire
extinguisher
- (C) Mosquito
repellent
- (D) Petrol
additive
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