Class X

In 1909, Millikan devised technique for measurement of
  1. Charge on electron
  2. Charge on cathode
  3. Charge on neutron
  4. Charge on proton
Change in kinetic energy is measured as difference of
  1. 1/2(mv)²
  2. (mv)²
  3. 1/2(mv)
  4. 1/2(m)²
 "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
At low temperature, body emits radiations of
  1. Shorter wave length
  2. High frequencies
  3. Longer wavelength
  4. Low frequencies
 Definition and standards of physical quantities were established in
  1. 1910
  2. 1920
  3. 1950
  4. 1960
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