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Discovery of Sub-Atomic Particles MCQs

1. Who did the oil drop experiment?

a) R. A. Millikan

b) J. J. Thomson

c) Rutherford

d) Galileo

Answer: R. A. Millikan

2. Thomson discovered that every substance in this universe is made up of ________ from his experiments.

a) neutrons

b) protons

c) electrons

d) mass

Answer: electrons

3. When cathode rays strike zinc sulfide coating, what did it create?

a) bright spot

b) blue light

c) uv rays

d) white light

Answer: bright spot

4. ___________ is the lightest and smallest particles that’s obtained from hydrogen(that is a positive ion).

a) Electron

b) Proton

c) Neutron

d) Particle

Answer: Proton

5. What’s the mass of neutron in terms of electrons mass?

a) 1838 times of electron’s mass

b) 1/1838 times of electron’s mass

c) 1832 times of electron’s mass

d) 1/1832 times of electron’s mass

Answer: 1838 times of electron’s mass

6. Neutrally charged particles are protons.

a) True

b) False

Answer: False

7. Which of the following may be an incorrect statement regarding cathode ray discharge tube?

a) Presence of negative charge in cathode rays

b) The magnetic field deflects these rays

c) It needs high voltage

d) Protons are present in cathode rays

Answer: Protons are present in cathode rays

8. Which of the following condition is suitable for cathode ray discharge tube?

a) Low pressure, high voltage

b) Low pressure, low voltage

c) High pressure, low voltage

d) High pressure, high voltage

Answer: Low pressure, high voltage

9. Pick out electron’s charge to mass ratio’s value from the options.

a) 1.758820 × 10¹¹ C kg^-1

b) 1.758820 × 10¹¹ C kg

c) 1.758823 × 10¹¹ C kg

d) 1.708820 × 10¹¹ C kg

Answer: 1.758820 × 10¹¹ C kg^-1

Discovery of Sub-Atomic Particles MCQs PDF Download

Categories: Structure of Atom