1.The gas used in the manufacture of vanaspati from vegetable oil is
A. hdrogen
B.oxygen
C.nitrogen
D.carbon dioxide
2.The first metal used by man was
A.iron
B.copper
C.gold
D.bronze
3.Freon Gas is used in
A.Air-conditioners
BRefrigerators
C.Television
D.Nuclear reactors
4.The preparation of soap involves the process called
A.Neutralization
B. Esterification
C.Hydrolysis
D.None of these
5. The gas used to extinguish fire is —
A. Neon
B. Nitrogen
c. Carbon dioxide
D. Carbon Monoxide
6. The working of the quartz crystal in the watch is based on
A.Jhonson effect
B.Photoelectric effect
C.Edison effect
D.Piezo electric effect
7. 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
8. Electric current is measures by
A.anemometer
B.voltmeter
C.ammeter
D.commutator
9. The element common to all acids is —
(A) Oxygen
(b) Hydrogen
(C) Nitrogen
(D) Sulphur
10. Fathom is unit of
A.sound
B.depth
C.distance
D.frequency
Note : Answers will be updated soon..............
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