GENERAL SCIENCE

1. The percentage of carbon is the least in —

(A) Grey cast iron
(B) Wrought iron
(C) White cast iron
(D) Steel

1 - (D)


2. 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

2 - (B)

3. 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

3 - (D)

4. 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

4 - (C)

5. The metal that is present in Photo Films is —
(A) Mercury
(B) Platinium
(C) Magnesium
(D) Silver

5 - (D)

6. Which of the following is in liquid form at room temperature ?
(A) Cerium
(B) Sodium
(C) Francium
(D) Lithium

6 - (C)

7. Soda water contains —
(A) Nitrous acid
(B) Carbonic acid
(C) Carbon dioxide
(D) Sulphuric acid

7 - (C)

8. Which of the following is basis of the modern periodic table ?
(A) Atomic mass
(B) Atomic number
(C) Atomic size
(D) Atomic volume

8 - (B)

9. Of the following metals, which one pollutes the air of a big city ?
(A) Copper
(B) Cadmium
(C) Lead
(D) Chromium

9 - (C)

10. Brass is an alloy of —
(A) Nickel and Copper
(B) Copper and Silver
(C) Nickel and Zinc
(D) Zinc and Copper

10- (D)

ANSWER KEY:
1 - (D)
2 - (B)
3 - (D)
4 - (C)
5 - (D)
6 - (C)
7 - (C)
8 - (B)
9 - (C)
10- (D)