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 4 of 4
- A. Isomers
- B. Protons
- C. Isotopes
- D. Nucleus
Explanation: Option A: Isomers are compounds that have the same molecular formula but different structural arrangements or spatial orientations.
Correct answer: Isotopes- A. Nature of gas
- B. Properties of gas
- C. Composition of gas
- D. All of these
Explanation: The e/m value of positive particles (anode rays) depends on the gas taken in the discharge tube. This content is given in the FSC book.
Correct answer: Nature of gas- A. 1889, electrons
- B. 1886, electrons
- C. 1836, protons
- D. 1836, electrons
Explanation: Remember that the mass of a proton is 1836 times heavier than that of an electron.
Correct answer: 1836, electrons64. The e/m value is maximum for _ gas because of _ value of "m" for positive rays obtained from it.
- A. Oxygen gas, lowest
- B. Hydrogen gas, highest
- C. Hydrogen gas, lowest
- D. Helium gas, highest
Explanation: Correct option is C. The highest value of e/m of anode rays has been observed when the discharge tube is filled with hydrogen.
Correct answer: Hydrogen gas, lowest- A. Mass of neutron is almost equal to mass of electron
- B. e/m of a proton is almost equal to e/m of electron
- C. Mass of proton is almost equal to mass of electron
- D. Charge of proton is almost equal to charge of electron
Explanation: Explanation:Both protons and electrons have the same charge in the atomic particles. Hence, the correct answer is D.
Correct answer: Charge of proton is almost equal to charge of electron- A. 1.7588 x 10^-11
- B. 1.7588 x 10^11
- C. 1.602 x 10^-19
- D. 1.7588 x 10^8
Explanation: A is incorrect as given value is not charge of one gram of electrons.B is incorrect as given value is charge of one kilogram of…
Correct answer: 1.7588 x 10^8- A. 1.7588 x 10^-11
- B. 1.7588 x 10^11
- C. 1.602 x 10^-19
- D. 1.7588 x 10^8
Explanation: We know 1 electron has a mass of 9.1x10²⁸g So 1g of electrons have how many number of electrons in it ?
Correct answer: 1.7588 x 10^8- A. Electron mass is 1/87th of proton
- B. Electron are universal particles of all matter
- C. Electrons are produced in discharge
- D. None of the above
Explanation: The constancy of the e/m ratio for electrons despite variations in the gas present in the discharge tube or in the material of the cathode…
Correct answer: Electron are universal particles of all matter- A. A: Low potential and low pressure
- B. B: Low potential and high pressure
- C. C: High potential and high pressure
- D. D: High potential and low pressure
Explanation: In a discharge tube, cathode rays are produced when electrons are emitted from the cathode and accelerated towards the anode.
Correct answer: D: High potential and low pressure- A. JJ Thomson
- B. E Rutherford
- C. R Milliken
- D. WC Roentgen
Explanation: The determination of the charge of the electron using the effect of an electric field on the rate of fall of oil droplets under gravity…
Correct answer: R Milliken- A. Quantized
- B. Integral multiple of 'e'
- C. Not less than 'e'
- D. All of the above
Explanation: Millikan's oil drop experiment demonstrated that the charge on an oil droplet is quantized, meaning it can only exist in discrete values…
Correct answer: All of the above- A. Any atomic nucleus
- B. A radioactive atomic nucleus
- C. A neutron or a proton
- D. A neutron proton or an electron
Explanation: A nucleon is either a proton or a neutron, which are the subatomic particles found in the nucleus of an atom.
Correct answer: A neutron or a proton