Class IX

A gas has
  1. Definite shape and volume
  2. Definite volume and no definite shape
  3. No definite volume no definite shape
  4. Definite shape but no definite volume
Which of the following has highest melting point?
  1. Ne
  2. Fe
  3. Pt
  4. W
The SI unit of latent heat of vaporisation is
  1. J g-1
  2. kJ kg-1
  3. . J kg-1
  4. cal g-1
The boiling points of the liquids decrease in the following order: B.P of water > B.P of kerosene > B.P of alcohol > B.P of petrol. Which of the following order is correct for decreasing rate of evaporation?
  1. water > alcohol = kerosene > petrol
  2. petrol > alcohol > kerosene > water
  3. remains same in all liquids
  4. water > kerosene > alcohol > petrol
Which of the following has heighest kinetic energy?
  1. Particles of ice at 0 °C
  2. Particles of water at 0 °C
  3. Particles of water at 100 °C
  4. Particles of steam at 100 °C
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