Class IX

. One unit of electrical energy is equal to
  1. 3.6 � 105J
  2. 3.6 � 106J
  3. 36 � 105J
  4. both (b) and (c)
The work done is �O� if
  1. The body shows displacement in the opposite direction of the force applied.
  2. The body shows displacement in the same direction as that of the force applied
  3. The body shows a displacement in perpendicular direction to the force applied.
  4. The body masses obliquely to the direction of the force applied.
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 work done is �O� if
  1. The body shows displacement in the opposite direction of the force applied.
  2. The body shows displacement in the same direction as that of the force applied
  3. body shows a displacement in perpendicular direction to the force applied.
  4. The body masses obliquely to the direction of the force applied.
. The spring will have maximum potential energy when
  1. it is pulled out
  2. it is compressed
  3. both (a) and (b)
  4. neither (a) nor (b)
Time Elapsed

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