Free Discovery of the Proton MCQs with Answers
72 Discovery of the Proton MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The discovery of the proton follows the study of positive rays, also called canal rays, observed in discharge tubes and later identified as positively charged particles. The work of Goldstein and Rutherford is linked to the proton's charge, relative mass and role in the nuclear model, distinct from the discovery of the electron.
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72 questions · page 3 of 4
- A. Electron
- B. Proton
- C. Neutron
- D. Meson
Explanation: Meson, any member of a family of subatomic particles composed of a quark and an antiquark.
Correct answer: Electron- A. Deuterium
- B. Tritium
- C. Ortho hydrogen
- D. None of these
Explanation: Ortho-para hydrogen are spin isomers of hydrogen . Hydrogen only has 3 isotopes. Refer to the image below:
Correct answer: Ortho hydrogen- A. Electron, neutrino
- B. Electron, proton
- C. Proton, neutrino
- D. Neutron, proton
Explanation: Option D is the best choice because neutrons and protons have mass most close to each other.
Correct answer: Neutron, proton- A. Hydrogen
- B. Helium
- C. Carbon
- D. Neon
Explanation: When a hydrogen atom loses its electron, it becomes a hydrogen ion, specifically a hydrogen cation (H+).
Correct answer: Hydrogen- A. Electron
- B. Neutron
- C. Nucleus
- D. None
Explanation: The charge-to-mass ratio (e/m) is a measure of the charge of a particle relative to its mass.
Correct answer: Electron- A. MgO
- B. CuO
- C. Al2O3
- D. ZnS
Explanation: MgO is not commonly used as phosphor materials for producing flashes upon electron impact.
Correct answer: ZnS- A. Neutron
- B. Mass number
- C. Atomic number
- D. Electrons
Explanation: A neutron is another subatomic particle found in the nucleus of an atom.
Correct answer: Electrons- A. Atomic number
- B. Mass number
- C. Hydrogen
- D. None
Explanation: The atomic number, denoted by the letter 'Z', represents the number of protons in the nucleus of an atom.
Correct answer: Atomic number- A. Positive
- B. Negative
- C. Neutral
- D. None
Explanation: The charge on a proton is positive because it is a fundamental particle with a positive electric charge, and its presence, along with…
Correct answer: Positive- A. 1836
- B. 1829
- C. 1882
Explanation: The mass of a proton is 1836 times heavier than that of electron due to the strong nuclear force on the proton.
Correct answer: 1836- A. Hydrogen gas
- B. Helium
- C. Neon
- D. Air
Explanation: The positive particle obtained from hydrogen is the lightest among all the other positive particles and is called a proton having mass…
Correct answer: Hydrogen gas- A. Isotopes
- B. Isobars
- C. Isotones
- D. Isomers
Explanation: Isotopes: Atoms of the same element with the same number of atomic numbers but a different mass number.Isotones: Species or atoms having…
Correct answer: Isobars53. The total types of fundamental nuclear sub-atomic particles are there in the nucleus of an atom?
- A. More than 100
- B. 2
- C. 3
- D. Equal to 100
Explanation: In the nucleus of an atom protons and neutrons are present.
Correct answer: 2- A. The existence of X-rays
- B. The existence of negative particles
- C. The mass to charge ratio of the electron
- D. The nuclear model of the atom
Explanation: Rutherford's gold foil experiment was a pivotal moment in atomic physics.
Correct answer: The nuclear model of the atom- A. Atoms are indivisible.
- B. Atoms are very small.
- C. Atoms of an element are identical.
- D. Atoms of one element always differ in mass from those of another element.
Explanation: The correct idea is that atoms are very small. This aligns with modern atomic theory, which recognizes atoms as the basic units of matter…
Correct answer: Atoms are very small.- A. Canal rays
- B. Cathode rays
- C. Both a and b
- D. None
Explanation: Positive rays are called canal rays which are streams of positively charged particles found in cathode ray tubes.
Correct answer: Canal rays- A. Alpha particle
- B. Neutron
- C. Electron
- D. Proton
- E. All of these
Explanation: A neutron has no net electric charge, so it is electrically neutral, whereas an alpha particle and proton are positive and an electron is…
Correct answer: Neutron- A. Charge
- B. Mass
- C. Magnitude of charge
- D. Both A and B
Explanation: The explanation for this question will be added soon.
Correct answer: Magnitude of charge- A. 1842
- B. 1/1836
- C. 1836
- D. 1840
Explanation: Protons are 1836 times heavier than electrons.
Correct answer: 1836- A. 1838 times more than mass of proton
- B. 1836 times less than mass of proton
- C. 1836 times more than mass of neutron
- D. 1836 times more than mass of hydrogen atom
Explanation: The mass of an electron is only about 1/2000 the mass of a proton or neutron, so electrons contribute virtually nothing to the total mass…
Correct answer: 1836 times less than mass of proton