1. In which of the following activities Silicon Carbide is used ?
(A) Making cement and glass
(B) Disinfecting water and
ponds
(C) Making castes for statues
(D) Cutting very hard substances
2. The element common to all acids is —
(A) Oxygen
(B) Hydrogen
(C) Nitrogen
(D) Sulphur
3. Gobar gas contains mainly —
(A) Methane
(B) Carbon dioxide
(C) Butane
(D) Carbon Monoxide
4. The most malleable metal is—
(A) Silver
(B) Gold
(C) Aluminium
(D) Sodium
5. Tetraethyl lead is used as —
(A) Mosquito repellent
(B) Pain Killer
(C) Fire extinguisher
(D) Petrol additive
6. Which of the following is used in beauty parlours for hair setting ?
(A) Phosphorus
(B) Sulphur
(C) Chlorine
(D) Silicon
7. Which of the following is a non-metal that remains liquid in room
temperature ?
(A) Bromine
(B) Chlorine
(C) Helium
(D) Phosphorus
8. From which mineral is
radium obtained —
(A) Limestone
(B) Haematitie
(C) Pitchblende
(D) Rutile
9. Which of the following is used as a material for making protective
windows in space
probes ?
(A) Steel
(B) Graphite
(C) Tungsten
(D) Diamond
10. Which form of phosphorus is used in safety metals?
(A) Red Phosphorus
(B) White Phosphorus
(C) Yellow Phosphorus
(D) Black Phosphorous
ANSWER KEY:
1 - (D)
2 - (B)
3 - (A)
4 - (A)
5 - (D)
6 - (B)
7 - (A)
8 - (C)
9 - (D)
10- (A)

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