Class X

If turn ratio of a transformer is 10, it means that
  1. Is = 10Ip
  2. Ip = 10Is
  3. Ns = 10Np
  4. Both a and b
In 1909, Millikan devised technique for measurement of
  1. Charge on electron
  2. Charge on cathode
  3. Charge on neutron
  4. Charge on proton
 "A current carrying coil placed in magnetic field experiences force", device that proves this law is
  1. DC generator
  2. DC motor
  3. AC generator
  4. Both a and b
Revolution per minute is system international unit of the
  1. Angular displacement
  2. Angular velocity
  3. Angular acceleration
  4. Angular speed
 Definition and standards of physical quantities were established in
  1. 1910
  2. 1920
  3. 1950
  4. 1960
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