Class X

Angle of incidence in optically denser medium for which angle of refraction in less dense medium is 90° is termed as
  1. Normal angle
  2. Covalent angle
  3. Critical angle
  4. Internal angle
 If we put some water in a pot and put it over Bunsen burner, thermal energy supplied to water would lead to a gain in
  1. External Energy
  2. Internal energy
  3. Chemical energy
  4. Physical energy
Heat capacity of a substance is equal to
  1. Amount of heat required to raise temperature of a substance by 1 K
  2. Amount of heat required to raise temperature of a 1 kg of a substance by 1 K
  3. Amount of heat required to change phase of a substance from solid to liquid without any change in temperature
  4. Amount of heat required to change phase of a substance from liquid to gas without any change in temperature
 Air conditioners are good example of
  1. Conduction
  2. Convection
  3. Radiation
  4. Conduction and radiation both
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