Class X

Time is calibrated using oscillation of
  1. Rubidium atom
  2. Cesium atom
  3. Strontium Atom
  4. Uranium atom
Frictional force and resistant force are types of
  1. Contact force
  2. Electrical force
  3. Magnetic force
  4. Tension
Quantities other than base quantities are termed as
  1. Derived quantities
  2. Base quantities
  3. Professional quantities
  4. Energetic quantities
 E.M.F is an abbreviation for
  1. Electronic Manufacturing Factories
  2. Electro Magnetic Force
  3. Electro Motive Force
  4. Electro Magnetic Function
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