### Class X

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
In solids, particles
1. Move randomly
3. Vibrate and move randomly
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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