Class X

 Thermal energy can be transferred by
  1. Conduction only
  2. Convection only
  3. Conduction and convection
  4. Conduction, convection and radiation
Which of following does not belong to list of factors that affect rate of transfer of energy by radiation?
  1. Color and texture of surface
  2. Temperature of surface
  3. Movement of air above surface
  4. Surface area
 Motion that is repeated at regular intervals is termed as
  1. Vibration
  2. Oscillation
  3. Ventilation
  4. Periodic motion
Every temperature measuring instrument makes use of a physical property of a substance in order to measure temperature objectively, which physical property is used by Mercury-in-glass thermometer?
  1. Electromotive force
  2. Volume of a fixed mass of liquid
  3. Resistance of a piece of metal
  4. Pressure of a fixed mass of gas at constant volume
 A cube-shaped block of pinewood has a surface area of 9 m² and a density of 0.5 g cm-3. Its mass equals
  1. 4500 g
  2. 4500 kg
  3. 13500 g
  4. 13500 kg
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