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
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
Process that does not require medium for transfer of thermal energy is
  1. Conduction
  2. Convection
  3. Radiation
  4. Conduction and convection
Reverse process that involves changing a liquid to a solid is known as
  1. Melting
  2. Boiling
  3. Condensation
  4. Solidification
Clinical thermometer has l100 23 cm and l0 is 5 cm, if lθ is 14 cm temperature of thermometer would be
  1. 50 °C
  2. 60 °C
  3. 75 °C
  4. 10°C
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