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
Change of liquid in to gas without boiling is called
  1. Vaporization
  2. Sublimation
  3. Boiling
  4. Evaporation
 Air conditioners are good example of
  1. Conduction
  2. Convection
  3. Radiation
  4. Conduction and radiation both
 Photon of electromagnetic radiation is
  1. α ray
  2. β ray
  3. γ ray
  4. x-ray
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
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