Class XI

Railway tracks are banked on curves
  1. . necessary centrifugal force may be obtained from the horizontal component weight of the train
  2. to avoid frictional force between the tracks and wheels
  3. necessary centripetal force may be obtained from the horizontal component of the weight of the train
  4. the train may not fly off in the opposite direction
Rainbow is due to
  1. absorption of sunlight in minute water droplets
  2. diffusion of sunlight through water droplets
  3. ionisation of water deposits
  4. refraction and reflection of sunlight by water droplets
Magnetism at the centre of a bar magnet is
  1. minimum
  2. . maximum
  3. zero
  4. minimum or maximum
The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is
  1. cineole
  2. engenol
  3. geraniol
  4. limonene
oil raise up the wick in a lamp. The principle involves
  1. the diffusion of oil through the wick
  2. the liquid state of oil
  3. . capillary action phenomenon
  4. volatility of oil
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