Class XI

The most electronegative element among the following is
  1. sodium
  2. bromine
  3. fluorine
  4. oxygen
. Materials for rain-proof coats and tents owe their water-proof properties to
  1. surface tension
  2. viscosity
  3. specific gravity
  4. elasticity
The octane number of zero is assigned to
  1. 2-methyl octane
  2. n-heptane
  3. iso-octane
  4. 3-methyl octane
Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open
  1. . at sea level
  2. . at the top of Mt. Everest
  3. at a place in a valley below sea level
  4. in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level
Superconductors are substances which
  1. conduct electricity at low temperature
  2. offer high resistance to the flow of current
  3. offer no resistance to the flow of electricity
  4. . conduct electricity at high temperatures
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