Class X

According to kinetic molecular model, in gases,
  1. The particles are closely packed together, they occupy minimum space and are usually arranged in a regular pattern
  2. The particles occur in clusters with molecules slightly further apart
  3. The molecules are very far apart and occupy all space made available to them
  4. The particles vibrate about fixed positions and are held together by strong intermolecular bonds between them
When solid is changing to liquid, at that period temperature
  1. Increases
  2. Decreases
  3. Remains constant
  4. May increase or decrease
Formula for work done is
  1. F × s, where F is force and s is displacement
  2. F/s, where F is force and s is displacement
  3. F + s, where F is force and s is displacement
  4. F -s, where F is force and s is displacement
Temperature of core of earth is equal to 3727 °C. This temperature in Kelvins is equal to
  1. 4000 K
  2. 3727 K
  3. 3454 K
  4. None of above
If specific latent heat of fusion of ice is 340 kJ ⁄ kg, heat required to melt ice of 100 g would be
  1. 34 J
  2. 3400 J
  3. 34000 J
  4. 34 MJ
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