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GENERAL SCIENCE - ELEMENTS AND METALS MCQs

Total Questions : 70 | Page 2 of 7 pages
Question 11. . The variety of coal in which the deposit contains recognisable traces of the original plant material is
  1.    bitumen
  2.    anthracite
  3.    lignite
  4.    peat
 Discuss Question
Answer: Option D. -> peat
Question 12. . Bromine is a
  1.    black solid
  2.    red liquid
  3.    colourless gas
  4.    highly inflammable gas
 Discuss Question
Answer: Option B. -> red liquid
Question 13.  
Quartz crystals normally used in quartz clocks etc. is chemically
  1.    silicon dioxide
  2.    germanium oxide
  3.    a mixture of germanium oxide and silicon dioxide
  4.    sodium silicate
 Discuss Question
Answer: Option A. -> silicon dioxide
Question 14. . Tetraethyl lead is used as
  1.    pain killer
  2.    fire extinguisher
  3.    mosquito repellent
  4.    petrol additive
 Discuss Question
Answer: Option D. -> petrol additive
Question 15. . The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is
  1.    Argon
  2.    Xenon
  3.    Helium
  4.    Krypton
 Discuss Question
Answer: Option C. -> Helium
Question 16. . The property of a substance to absorb moisture from the air on exposure is called
  1.    osmosis
  2.    deliquescence
  3.    efflorescence
  4.    desiccation
 Discuss Question
Answer: Option B. -> deliquescence
Question 17. . Which of the following is used as a lubricant?
  1.    Graphite
  2.    Silica
  3.    Iron Oxide
  4.    Diamond
 Discuss Question
Answer: Option A. -> Graphite
Question 18. . The gases used in different types of welding would include
  1.    oxygen and hydrogen
  2.    oxygen, hydrogen, acetylene and nitrogen
  3.    oxygen, acetylene and argon
  4.    oxygen and acetylene
 Discuss Question
Answer: Option D. -> oxygen and acetylene
Question 19. . In which of the following activities silicon carbide is used?
  1.    Making cement and glass
  2.    Disinfecting water of ponds
  3.    cutting very hard substances
  4.    Making casts for statues
 Discuss Question
Answer: Option C. -> cutting very hard substances
Question 20. . When an iron nail gets rusted, iron oxide is formed
  1.    without any change in the weight of the nail
  2.    with decrease in the weight of the nail
  3.    with increase in the weight of the nail
  4.    without any change in colour or weight of the nail
 Discuss Question
Answer: Option C. -> with increase in the weight of the nail

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