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Question of the day
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Question of the Day (10-Nov-20)

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Identify the incorrect sentence or sentences.
  1. All the facts thus predicted by the theory is confirmed by experiment.
  2. There is no known process which permit the direct measurement of the mass of an electron.
  3. In the case of the cathode rays emitted by radium, these measurements are particularly interesting, for the reason that the rays which compose a pencil of cathode rays are animated by very different speeds.
  4. Professor Kaufmann has effected some very careful experiments by the method of crossed spectra.
  5. He has thus been enabled by working in vacuo to register the very different velocities which, starting in the case of certain rays from about seven-tenths of the velocity of light, attain in other cases in ninety-five hundredths of it.

OPTIONS
 
 1)A, B, D and E
 2)A, B and E
 3)Only C
 4)A, B and C
 5)D and E

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