Exercise: General Science

Questions for: General Science

Permanent hardness of water can be removed by adding
A:
chlorine
B:
washing soda
C:
potassium permanganate
D:
bleaching powder
Answer: B
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In fireworks, the green flame is produced because of
A:
sodium
B:
barium
C:
mercury
D:
potassium
Answer: B
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Diamond is an allotropic form of
A:
germanium
B:
carbon
C:
silicon
D:
sulphur
Answer: B
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The filament of an electric bulb is made of
A:
tungsten
B:
nichrome
C:
graphite
D:
iron
Answer: A
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The two elements that are frequently used for making transistors are
A:
boron and aluminium
B:
silicon and germanium
C:
iridium and tungsten
D:
niobium and columbium
Answer: B
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