Radioactivity(General Knowledge > General Science ) Questions and Answers

Question 1. Two isotopes of the same element have
  1.    the same number of protons but different numbers of neutrons
  2.    the same number of protons but different numbers of electrons
  3.    the same number of neutrons but different numbers of protons
  4.    the same number of electrons but different numbers of protons
Explanation:-
Answer: Option A. -> the same number of protons but different numbers of neutrons
Question 2. The half-life of a radioisotope is 2400 years
  1.    300 years
  2.    2400 years
  3.    7200 years
  4.    19 200 years
Explanation:-
Answer: Option C. -> 7200 years
Question 3. The isotopes of neutral atoms of an element differ in
  1.    Atomic number
  2.    Mass number
  3.    Number of electrons
  4.    Chemical properties
Explanation:-
Answer: Option B. -> Mass number
Question 4. Which particles make up the nucleus of an atom?
  1.    protons and neutrons
  2.    electrons and protons
  3.    electrons, protons, and neutrons
  4.    electrons and neutrons
Explanation:-
Answer: Option A. -> protons and neutrons
Question 5. A detector is used to measure the count-rate near a radioactive source
  1.    3 minutes
  2.    5 minutes
  3.    6 minutes
  4.    10 minutes
Explanation:-
Answer: Option D. -> 10 minutes
Question 6. Which particles are negatively charged
  1.    alpha
  2.    beta
  3.    gamma
  4.    none of the above
Explanation:-
Answer: Option B. -> beta
Question 7. Fusion occurs when nuclei
  1.    split
  2.    combine
  3.    mutate
  4.    gain energy
Explanation:-
Answer: Option A. -> split
Question 8. Which is an alpha particle
  1.    Fast moving electron
  2.    4 2 He nuclei
  3.    fast moving positron
  4.    EM wave
Explanation:-
Answer: Option B. -> 4 2 He nuclei
Question 9. The centre of an atom is called
  1.    the electron
  2.    the proton
  3.    the nucleus
  4.    the neutron
Explanation:-
Answer: Option C. -> the nucleus
Question 10. Which particles are found in the nucleus of an atom?
  1.    neutrons and protons only
  2.    neutrons only
  3.    protons and electrons only
  4.    protons, electrons and neutrons
Explanation:-
Answer: Option A. -> neutrons and protons only
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