Class X

Solid is turned to liquid because
  1. After intermolecular bonds are broken down particles are now free to move
  2. Particles collide with each other
  3. Kinetic energy increases rate of thermal energy
  4. Particles start vibrating more vigorously
Process that does not require medium for transfer of thermal energy is
  1. Conduction
  2. Convection
  3. Radiation
  4. Conduction and convection
Given that both liquid A and liquid B exert same amount of pressure, what would be height of column of liquid A if density of liquid A is twice density of liquid B and height of column of liquid B is 10 cm?
  1. 5 cm
  2. 10 cm
  3. 20 cm
  4. None of above
Reverse process that involves changing a liquid to a solid is known as
  1. Melting
  2. Boiling
  3. Condensation
  4. Solidification
An electric iron is rated at 1000 W. amount of heat generated in 15 minutes is equal to
  1. 66.67 J
  2. 15 kJ
  3. 900 kJ
  4. None of above
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