General Science Questions and Answers

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Q41
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: Option B
Q42
The filament of an electric bulb is made of
  • A tungsten
  • B nichrome
  • C graphite
  • D iron
Answer: Option A
Q43
Diamond is an allotropic form of
  • A germanium
  • B carbon
  • C silicon
  • D sulphur
Answer: Option B
Q44
In fireworks, the green flame is produced because of
  • A sodium
  • B barium
  • C mercury
  • D potassium
Answer: Option B
Q45
Permanent hardness of water can be removed by adding
  • A chlorine
  • B washing soda
  • C potassium permanganate
  • D bleaching powder
Answer: Option B
Q46
Marsh gas is
  • A nitrogen
  • B ethane
  • C methane
  • D hydrogen
Answer: Option C
Q47
LPG consists of mainly
  • A methane, ethane and hexane
  • B ethane, hexane and nonane
  • C methane, hexane and nonane
  • D methane, butane and propane
Answer: Option D
Q48
Air is a/an
  • A compound
  • B element
  • C electrolyte
  • D mixture
Answer: Option D
Q49
Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the following domestic products?
  • A Television
  • B Refrigerator
  • C Tube light
  • D Cooking gas
Answer: Option B
Q50
Balloons are filled with
  • A nitrogen
  • B helium
  • C oxygen
  • D argon
Answer: Option B

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