Class IX

How much time will be required to perform 520 J of work at the rate of 20 W?
  1. 24s
  2. 16s
  3. 20s
  4. 26s
The gravitational potential energy of an object is due to
  1. its mass
  2. its acceleration due to gravity
  3. its height above the earth’s surface
  4. all of above
. One unit of electrical energy is equal to
  1. 3.6 � 105J
  2. 3.6 � 106J
  3. 36 � 105J
  4. both (b) and (c)
. A ball is dropped from a height of 10 m.
  1. Its potential energy increases and kinetic energy decreases during the falls
  2. Its potential energy is equal to the kinetic energy during the fall.
  3. The potential energy decreases and the kinetic energy increases during the fall
  4. The potential energy is �0� and kinetic energy is maximum while it is falling.
One unit of electrical energy is equal to
  1. 3.6 x105J
  2. 3.6 x 106J
  3. 36 x 105J
  4. both (b) and (c)
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