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
(B) Disinfecting water and ponds
(C) Making castes for statues
(D) Cutting very hard substances
2 - (B)
3. Gobar gas contains mainly —
(A) Methane
(B) Carbon dioxide
(C) Butane
(D) Carbon Monoxide
3 - (A)
4. The most malleable metal is —
(A) Silver
(B) Gold
(C) Aluminium
(D) Sodium
4 - (A)
5. Tetraethyl lead is used as —
(A) Mosquito repellent
(B) Pain Killer
(C) Fire extinguisher
(D) Petrol additive
5 - (D)
6. Which of the following is used in beauty parlours for hair setting ?
(A) Phosphorus
(B) Sulphur
(C) Chlorine
(D) Silicon
6 - (B)
7. Which of the following is a non-metal that remains liquid in room temperature ?
(A) Bromine
(B) Chlorine
(C) Helium
(D) Phosphorus
7 - (A)
8. From which mineral is radium obtained —
(A) Limestone
(B) Haematitie
(C) Pitchblende
(D) Rutile
8 - (C)
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
9 - (D)
10. Which form of phosphorus is used in safety metals?
(A) Red Phosphorus
(B) White Phosphorus
(C) Yellow Phosphorus
(D) Black Phosphorous
10- (A)
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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