Science GK Quiz on Material Science - Set 03 - ObjectiveBooks

Science GK Quiz on Material Science - Set 03

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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