Class X

Work done must have same unit as
  1. Force
  2. Power
  3. Energy
  4. Efficiency
Specific latent heat of vaporization is
  1. Amount of heat required to raise temperature of a 1 kg of a substance by 1 K
  2. Amount of heat required to change phase of a substance from liquid to gas without any change in temperature
  3. Amount of heat required to change phase of a 1 kg of substance from solid to liquid without any change in temperature
  4. Amount of heat required to change phase of a 1 kg of substance from liquid to gas without any change in temperature
 Liquids are
  1. Very compressible
  2. Very little compressible
  3. Incompressible
  4. B and C both
 A car uses total energy of 2500 J and output is 750 J. efficiency of car is
  1. 50%
  2. 30%
  3. 25%
  4. 80%
Air trapped inside a single-piston-cylinder exerts a pressure of 760 mmHg. If its volume is increased by 30% at a constant temperature, pressure exerted would be equal to
  1. 533 mmHg
  2. 544 mmHg
  3. 584 mmHg
  4. 633 mmHg
Time Elapsed

HR : MIN : SEC
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