Class X

In solids, particles
  1. Move randomly
  2. Vibrate about fixed position
  3. Vibrate and move randomly
  4. Move about fixed path
A heater changes temperature of room from 20 °C to 40 °C with energy usage of 20000 J, heat capacity of air in room would be
  1. 500 J K-1
  2. 1000 J K-1
  3. 1200 J K-1
  4. 1500 J K-1
For a sphere that is dropped into a viscous liquid, Strokes law states that force of friction is given by
  1. 6π × radius of sphere × coefficient of viscosity × velocity of sphere at a particular instant
  2. (6π × radius of sphere × coefficient of viscosity) ⁄ velocity of sphere at a particular instant
  3. (6π × radius of sphere) ⁄ (coefficient of viscosity × velocity of sphere at a particular instant)
  4. 6π ⁄ (radius of sphere × coefficient of viscosity × velocity of sphere at a particular instant)
When a solid changes its state to liquid upon heating, this change of state is termed as
  1. Melting
  2. Solidification
  3. Boiling
  4. Condensation
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