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NDA 2018 GAT · General Knowledge · Atomic Structure, Periodic Table and Bonding · medium

Cathode rays are streams of electrons. 2. The proton was discovered by Chadwick.

Single correct option

Consider the following statements:
1. Cathode rays are streams of electrons.
2. The proton was discovered by Chadwick.
Which of the statements is/are correct?
  1. A. 1 only
  2. B. 2 only
  3. C. Both 1 and 2
  4. D. Neither 1 nor 2
Show answer and solution

Answer: (A) 1 only

Cathode rays produced in a discharge tube are deflected by electric and magnetic fields as negatively charged particles, and J. J. Thomson identified them as electrons, so statement 1 is correct. Chadwick discovered the neutron in 1932; the proton was identified through the work of Goldstein and Rutherford, so statement 2 is wrong.
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Original question written in the NDA 2018 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake