Class X

A thermometer has l100 50 cm and l0 is 10 cm, if lθ is 15 cm temperature of thermometer would be
  1. 25 °C
  2. 17.5 °C
  3. 12.5 °C
  4. 50 °C
Two types of lenses are
  1. Small and large
  2. Converging and diverging
  3. Transpiring and respiring
  4. Living and non-living
 A person boils water from 75 °C, water uses thermal energy of 10000 J, heat capacity of water is
  1. 200 J K-1
  2. −200 J K-1
  3. 400 J K-1
  4. −400 J K-1
Food we eat contains
  1. Chemical Potential Energy
  2. Elastic Potential Energy
  3. Gravitational Potential Energy
  4. Kinetic energy
Lf is symbol for
  1. Latent heat of Fusion
  2. Specific Latent Heat of Vaporization
  3. Specific Latent Heat of Fusion
  4. Latent Heat of Vaporization
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