Class XI

Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be
  1. 2 : 16 : 2
  2. 2 : 16 : 1
  3. 1 : 16 : 2
  4. 1 : 1 : 1
An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is
  1. 1200 m
  2. 0.33 km
  3. 3.33 km
  4. 33 km
The main buffer system of the human blood is
  1. H2CO3 - HCO3
  2. H2CO3 - CO32-
  3. CH3COOH - CH3COO-
  4. NH2CONH2 - NH2CONH+
The method of concentrating the ore which makes use of the difference in density between ore and impurities is called
  1. liquation
  2. levigation
  3. magnetic separation
  4. levigation
The octane number of zero is assigned to
  1. 2-methyl octane
  2. n-heptane
  3. iso-octane
  4. 3-methyl octane
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