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GENERAL SCIENCE - ELEMENTS AND METALS MCQs

Total Questions : 70 | Page 5 of 7 pages
Question 41. . Actinides are the elements with atomic numbers from
  1.    97 to 104
  2.    101 to 115
  3.    89 to 103
  4.    36 from 43
 Discuss Question
Answer: Option C. -> 89 to 103
Question 42. . What is laughing gas?
  1.    Nitrous Oxide
  2.    Carbon monoxide
  3.    Sulphur dioxide
  4.    Hydrogen peroxide
 Discuss Question
Answer: Option A. -> Nitrous Oxide
Question 43. . The filament of an electric bulb is made of
  1.    tungsten
  2.    nichrome
  3.    graphite
  4.    iron
 Discuss Question
Answer: Option A. -> tungsten
Question 44. . Diamond is an allotropic form of
  1.    germanium
  2.    carbon
  3.    silicon
  4.    sulphur
 Discuss Question
Answer: Option B. -> carbon
Question 45. . The two elements that are frequently used for making transistors are
  1.    boron and aluminium
  2.    silicon and germanium
  3.    iridium and tungsten
  4.    niobium and columbium
 Discuss Question
Answer: Option B. -> silicon and germanium
Question 46. . Marsh gas is
  1.    nitrogen
  2.    ethane
  3.    methane
  4.    hydrogen
 Discuss Question
Answer: Option C. -> methane
Question 47. . Permanent hardness of water can be removed by adding
  1.    chlorine
  2.    washing soda
  3.    potassium permanganate
  4.    bleaching powder
 Discuss Question
Answer: Option B. -> washing soda
Question 48. .  In fireworks, the green flame is produced because of
  1.    sodium
  2.    barium
  3.    mercury
  4.    potassium
 Discuss Question
Answer: Option B. -> barium
Question 49. . LPG consists of mainly
  1.    methane, ethane and hexane
  2.    ethane, hexane and nonane
  3.    methane, hexane and nonane
  4.    methane, butane and propane
 Discuss Question
Answer: Option D. -> methane, butane and propane
Question 50. . Air is a/an
  1.    compound
  2.    element
  3.    electrolyte
  4.    mixture
 Discuss Question
Answer: Option D. -> mixture

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