Q. Brass is an alloy of -
1) Copper and Zinc
2) Copper and Aluminium
3) Copper and Tin
4) Iron and Copper
Q. Percentage of lead pencils is
1) 31-66
2) 0
3) 40
4) 80
Q. The most abundant inert gas in the atmosphere is
1) Argon
2) Helium
3) Neon
4) Krypton
Q. The metal, which is a constituent of Vitamin B12, is
1) Cobalt
2) Iron
3) Zinc
4) Magnesium
Q. Denatured spirit is ethanol mixed with
1) Pyridine
2) Kerosene
3) Petrol
4) Water
Q. To chemical name of 'Commom salt' is
1) Sodium chloride
2) Sodium nitrate
3) Ammonium chloride
4) Calcium chloride
Q. Which mineral is the ore of aluminium?
1) Bauxite
2) Haematite
3) Siderite
4) Magnetite
Q. Chemical name of bleaching powder is:
1) Calcium Chlorate
2) Calcium Chloro hypochlorite
3) Calcium hypochlorite
4) Calcium bi Chloride
Q. Which one of the following is also called Stranger Gas?
1) Xenon
2) Argon
3) Neon
4) Nitrous oxide
Q. Which among the following elements (metals) pollutes the air of a city having large number of automobiles?
1) Cadmium
2) Chromium
3) Lead
4) Nickel
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