Class X

State of equilibrium is when
  1. There is no opposing force
  2. There is no force acting on an object
  3. Object is moving in uniform speed
  4. B and C both
 SI unit of moment of force is
  1. N m-1
  2. N m
  3. J, where J is joules
  4. W, where W is watts
A car covers a distance of 5 km in 5 mins, its average speed is equal to
  1. 1 km ⁄ h
  2. 25 km ⁄ h
  3. 60 km ⁄ h
  4. None of above
Pair of two hollow cups is termed as
  1. Galileo hemispheres
  2. Isaac hemispheres
  3. Albert hemispheres
  4. Magdeburg hemispheres
Increase rate of evaporation
  1. Decrease rate of evaporation
  2. Not affect rate of evaporation
  3. Disturb rate of evaporation
  4. Increase rate of evaporation
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