Class X

Sound is produced due to
  1. Friction
  2. Circulation
  3. Vibration
  4. Refraction
Matter consists of tiny particles termed as
  1. Matter
  2. Atoms
  3. Ions
  4. Elements
Gases have
  1. Low density and mass
  2. High density and mass
  3. High density but low mass
  4. Low density but high mass
Transfer of thermal energy by means of currents in fluids is termed as
  1. Conduction
  2. Convection
  3. Radiation
  4. Convection and radiation
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