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Question 1. Atoms of different elements have
  1.    Same atomic number and same electronic configuration
  2.    Different atomic number and same eletronic configu-ration
  3.    Different atomic number and different number of valence electrons
  4.    Same number of electrons and neutrons
Answer: Option C

Question 2. Which of the following is the maximum number of electrons that can be present in M-shell?
  1.    2
  2.    8
  3.    18
  4.    32
Answer: Option C

Question 3. All isotopes of the same element have ________
  1.    Different atomic numbers and different atomic mass
  2.    Different atomic numbers and the same atomic mass
  3.    The same atomic number but different atomic masses
  4.    The same atomic number and the atomic mass
Answer: Option C

Question 4. The smog is essentially caused by the presence of
  1.    O3 and N2
  2.    O2 and N2
  3.    Oxides of N and S
  4.    O2 and O3
Answer: Option C

Question 5. Which of the following pollutants is main product of automobile exhaust ?
  1.    CO
  2.    CO2
  3.    NO
  4.    Hydrocarbons
Answer: Option C

Question 6. Which of the following is usually not an air-pollutant?
  1.    Hydrocarbons
  2.    Sulphur dioxide
  3.    Carbon dioxide
  4.    Nitrous oxide
Answer: Option D