General Science - Elements And Metals(General Knowledge ) Questions and Answers

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
Explanation:-
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
Explanation:-
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
Explanation:-
Answer: Option B. -> Bromine
Question 4.  Chemical formula for water is
  1.    NaAlO2
  2.    H2O
  3.    Al2O3
  4.    CaSiO3
Explanation:-
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
Explanation:-
Answer: Option B. -> Mercury
Question 6.  Which of the following is used in pencils?
  1.    Graphite
  2.    Silicon
  3.    Charcoal
  4.    Phosphorous
Explanation:-
Answer: Option A. -> Graphite
Question 7.  The gas usually filled in the electric bulb is
  1.    nitrogen
  2.    hydrogen
  3.    carbon dioxide
  4.    oxygen
Explanation:-
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
Explanation:-
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
Explanation:-
Answer: Option D. -> Hydrogen
Question 10. . The hardest substance available on earth is
  1.    Gold
  2.    Iron
  3.    Diamond
  4.    Platinum
Explanation:-
Answer: Option C. -> Diamond
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