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Doctors Medicines MCQs Q&A

  1. 1 and 2 only 
  2. 1, 2 and 3
  3. 3 and 4
  4. 1 and 4
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1 Answers

Option 1 : 1 and 2 only 

CONCEPT:

  • The electrons, protons and neutrons are three fundamental particles of an atom.
  • The electrons are negatively charged and protons are positively charged.
  • Neutrons are neutral.

EXPLANATION:

  • As the cathode rays are the stream of electrons. So an electron is a constituent of the cathode ray. Statement 1 is correct.
  • Since the electron is a negatively charged particle. So statement 2 is correct.

Mass of an electron = 9.1 × 10-31 kg

Mass of a proton = 1.67 × 10-27 kg

  • Since the mass of the electron is not equal to the mass of the proton. So statement 3 is wrong.
  • As electrons have a charge which can deflect in both electric as well as the magnetic field. So statement 4 is not correct.
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