Class X

 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
Rate of transfer of energy by radiation can be increased by
  1. Using shiny white surfaces instead of dull and black surfaces
  2. Increasing surface temperature
  3. Decreasing surface area
  4. Decreasing atmospheric pressure
 Liquids are
  1. Very compressible
  2. Very little compressible
  3. Incompressible
  4. B and C both
Work done must have same unit as
  1. Force
  2. Power
  3. Energy
  4. Efficiency
Time Elapsed

HR : MIN : SEC
Question Answered
0
Score out of 100
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