Class X

 A mercury-in-glass thermometer has l100 30 cm and l0 is 10 cm, if lθ is 25 cm, temperature of thermometer would be
  1. 12.5 °C
  2. 25 °C
  3. 50 °C
  4. 75 °C
In order to do work, energy is
  1. Transferred or converted
  2. Used up
  3. Lost
  4. Lost or transferred
 Cooking utensils are a good example of
  1. Conduction
  2. Convection
  3. Radiation
  4. Conduction and Radiation
 If heat capacity of a 10 g of a substance is 300 J K-1, heat capacity of a 100 g of same substance would be equal to
  1. 3 J ⁄ K
  2. 30 J ⁄ K
  3. 300 J ⁄ K
  4. 3000 J ⁄ K
 Any two shortest points in a wave that are in phase are termed as
  1. Wave distance
  2. Wave length
  3. Phase length
  4. Amplitude
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