Class X

Work done must have same unit as
  1. Force
  2. Power
  3. Energy
  4. Efficiency
If two forces of 20 N towards north and 12 N towards south are acting on an object. resultant force will be
  1. 32 N toward north
  2. 20 N towards north
  3. 32 N towards south
  4. 8 N towards north
 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
 Liquids are
  1. Very compressible
  2. Very little compressible
  3. Incompressible
  4. B and C both
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