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GENERAL SCIENCE - ELEMENTS AND METALS MCQs

Total Questions : 70 | Page 3 of 7 pages
Question 21. . The average salinity of sea water is
  1.    3%
  2.    3.5%
  3.    2.5%
  4.    2%
 Discuss Question
Answer: Option B. -> 3.5%
Question 22. . Galvanised iron sheets have a coating of
  1.    lead
  2.    chromium
  3.    zinc
  4.    tin
 Discuss Question
Answer: Option C. -> zinc
Question 23. . The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of
  1.    bromine
  2.    fluorine
  3.    chlorine
  4.    sulphur
 Discuss Question
Answer: Option D. -> sulphur
Question 24. . The element common to all acids is
  1.    hydrogen
  2.    carbon
  3.    sulphur
  4.    oxygen
 Discuss Question
Answer: Option A. -> hydrogen
Question 25. . Heavy water is
  1.    deuterium oxide
  2.    PH7
  3.    rain water
  4.    tritium oxide
 Discuss Question
Answer: Option A. -> deuterium oxide
Question 26. . Among the various allotropes of carbon,
  1.    coke is the hardest, graphite is the softest
  2.    diamond is the hardest, coke is the softest
  3.    diamond is the hardest, graphite is the softest
  4.    diamond is the hardest, lamp black is the softest
 Discuss Question
Answer: Option C. -> diamond is the hardest, graphite is the softest
Question 27. . The group of metals Fe, Co, Ni may best called as
  1.    transition metals
  2.    main group metals
  3.    alkali metals
  4.    rare metals
 Discuss Question
Answer: Option A. -> transition metals
Question 28. . Non stick cooking utensils are coated with
  1.    Teflon
  2.    PVC
  3.    black paint
  4.    polystyrene
 Discuss Question
Answer: Option A. -> Teflon
Question 29. . Monazite is an ore of
  1.    titanium
  2.    zirconium
  3.    iron
  4.    thorium
 Discuss Question
Answer: Option D. -> thorium
Question 30. . Potassium nitrate is used in
  1.    medicine
  2.    fertiliser
  3.    salt
  4.    glass
 Discuss Question
Answer: Option B. -> fertiliser

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