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GENERAL SCIENCE - ELEMENTS AND METALS MCQs

Total Questions : 70 | Page 1 of 7 pages
Question 1.  Brass gets discoloured in air because of the presence of which of the following gases in air?
  1.    Oxygen
  2.    Hydrogen sulphide
  3.    Carbon dioxide
  4.    Nitrogen
 Discuss Question
Answer: Option B. -> Hydrogen sulphide
Question 2.  Chlorophyll is a naturally occurring chelate compound in which central metal is
  1.    copper
  2.    magnesium
  3.    iron
  4.    calcium
 Discuss Question
Answer: Option B. -> magnesium
Question 3.  Which of the following is a non metal that remains liquid at room temperature?
  1.    Phosphorous
  2.    Bromine
  3.    Chlorine
  4.    Helium
 Discuss Question
Answer: Option B. -> Bromine
Question 4.  Chemical formula for water is
  1.    NaAlO2
  2.    H2O
  3.    Al2O3
  4.    CaSiO3
 Discuss Question
Answer: Option B. -> H2O
Question 5.  
Which of the following metals forms an amalgam with other metals?
  1.    Tin
  2.    Mercury
  3.    Lead
  4.    Zinc
 Discuss Question
Answer: Option B. -> Mercury
Question 6.  Which of the following is used in pencils?
  1.    Graphite
  2.    Silicon
  3.    Charcoal
  4.    Phosphorous
 Discuss Question
Answer: Option A. -> Graphite
Question 7.  The gas usually filled in the electric bulb is
  1.    nitrogen
  2.    hydrogen
  3.    carbon dioxide
  4.    oxygen
 Discuss Question
Answer: Option A. -> nitrogen
Question 8.  Washing soda is the common name for
  1.    Sodium carbonate
  2.    Calcium bicarbonate
  3.    Sodium bicarbonate
  4.    Calcium carbonate
 Discuss Question
Answer: Option A. -> Sodium carbonate
Question 9. . Which of the gas is not known as green house gas?
  1.    Methane
  2.    Nitrous oxide
  3.    Carbon dioxide
  4.    Hydrogen
 Discuss Question
Answer: Option D. -> Hydrogen
Question 10. . The hardest substance available on earth is
  1.    Gold
  2.    Iron
  3.    Diamond
  4.    Platinum
 Discuss Question
Answer: Option C. -> Diamond

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