1. Potassium nitrate is used in —
(A) Salt
(B) Glass
(C) Fertiliser
(D) Medicine
2. In which type of rocks are metals like Gold and Copper mostly found ?
(A) Old igneous
(B) Old sedimentary
(C) Old metamorphic
(D) New metamorphic
3. Which of the following gases is lighter than air ?
(A) Carbon dioxide
(B) Oxygen
(C) Ammonia
(D) Chlorine
4. Which of the following is used as lubricant ?
(A) Graphite
(B) Silica
(C) Diamond
(D) Iron Oxide
5. The purest form of iron is —
(A) Steel
(B) Pig iron
(C) Cast iron
(D) Wrought iron
6. The percentage of carbon is the least in —
(A) Grey cast iron
(B) Wrought iron
(C) White cast iron
(D) Steel
7. The colour of Emerald is —
(A) Violet
(B) Yellow
(C) Deep Green
(D) Prussian Blue
8. Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of —
(A) Nitrates
(B) Zeolites
(C) Sulphonates
(D) None of these
9. Rust is —
(A) A mixture of Fe2O3 and Fe(OH)2
(B) A mixture of FeO and Fe(OH)2
(C) FeO only
(D) A mixture of Fe2O3, 3H2O and FeO
10. Liquefied Petroleum gas (LPG) consists of mainly —
(A) Methane, Ethane and Hexane
(B) Ethane, Hexane and Nonane
(C) Methane, Butane and Propane
(D) Methane, Hexane and Nonane
ANSWER KEY:
1 - (B)
2 - (A)
3 - (C)
4 - (A)
5 - (D)
6 - (D)
7 - (C)
8 - (B)
9 - (D)
10- (C)
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