General Science - Questions (Section-1)
1Brass gets discoloured in air because of the presence of which of the following gases in air?
A. OxygenB. Hydrogen sulphide
C. Carbon dioxide D. Nitrogen
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2Chlorophyll is a naturally occurring chelate compound in which central metal is
A. copperB. magnesium
C. iron D. calcium
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3Which of the following is a non metal that remains liquid at room temperature?
A. PhosphorousB. Bromine
C. Chlorine D. Helium
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4Which of the following is used in pencils?
A. GraphiteB. Silicon
C. Charcoal D. Phosphorous
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5Which of the following metals forms an amalgam with other metals?
A. TinB. Mercury
C. Lead D. Zinc
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