General Science Questions and Answers


General Knowledge

General Science Questions and Answers


    21)

    When an iron nail gets rusted, iron oxide is formed

  • A)without any change in the weight of the nail
  • B)with decrease in the weight of the nail
  • C)with increase in the weight of the nail
  • D)without any change in colour or weight of the nail
Answer: C

    22)

    Galvanised iron sheets have a coating of

  • A)lead
  • B)chromium
  • C)zinc
  • D)tin
Answer: C

    23)

    Among the various allotropes of carbon,

  • A)coke is the hardest, graphite is the softest
  • B)diamond is the hardest, coke is the softest
  • C)diamond is the hardest, graphite is the softest
  • D)diamond is the hardest, lamp black is the softest
Answer: C

    24)

    The group of metals Fe, Co, Ni may best called as

  • A)transition metals
  • B)main group metals
  • C)alkali metals
  • D)rare metals
Answer: A

    25)

    Heavy water is

  • A)deuterium oxide
  • B)PH7
  • C)rain water
  • D)tritium oxide
Answer: A