Class XII

Recently lead free petrol was introduced in our country because
  1. they are not needed now as anti-knock agents
  2. they tower the efficiency of the engine
  3. they cause less pollution
  4. to reduce the cost of petrol
Oxygen was independently discovered by
  1. Rutherford
  2. William Ramsay
  3. Joseph Priestley
  4. Neils Bohr
Sheikh Mujibur Rahman is a well known freedom fighter of
  1. Bangladesh
  2. Myanmar
  3. Pakistan
  4. Afghanistan
P.T. Usha, who came close to bagging a bronze finished fourth in ____ in 1984 Olympics.
  1. 400 m final
  2. 800 m final
  3. 400 m hurdle
  4. the marathon
Pakistan left the Commonwealth in 1972, but rejoined as 49th member of the Commonwealth in
  1. 1984
  2. 1991
  3. 1997
  4. 2000
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