General Science Questions and Answers


General Knowledge

General Science Questions and Answers


    46)

    In fireworks, the green flame is produced because of

  • A)sodium
  • B)barium
  • C)mercury
  • D)potassium
Answer: B

    47)

    Permanent hardness of water can be removed by adding

  • A)chlorine
  • B)washing soda
  • C)potassium permanganate
  • D)bleaching powder
Answer: B

    48)

    Marsh gas is

  • A)nitrogen
  • B)ethane
  • C)methane
  • D)hydrogen
Answer: C

    49)

    LPG consists of mainly

  • A)methane, ethane and hexane
  • B)ethane, hexane and nonane
  • C)methane, hexane and nonane
  • D)methane, butane and propane
Answer: D

    50)

    Air is a/an

  • A)compound
  • B)element
  • C)electrolyte
  • D)mixture
Answer: D