Class XI

LPG consists of mainly
  1. methane, ethane and hexane
  2. . ethane, hexane and nonane
  3. methane, hexane and nonane
  4. methane, butane and propane
Sodium metal is kept under
  1. petrol
  2. alcohol
  3. water
  4. kerosene
Atoms are composed of
  1. . electrons and protons
  2. . electrons only
  3. protons only
  4. . electrons and nuclei
Which of the following is used as a moderator in nuclear reactor?
  1. Thorium
  2. Graphite
  3. Radium
  4. Ordinary water
Balloons are filled with
  1. nitrogen
  2. helium
  3. oxygen
  4. argon
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