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RADIOACTIVITY MCQs

Total Questions : 16 | Page 1 of 2 pages
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
 Discuss Question
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
 Discuss Question
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
 Discuss Question
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
 Discuss Question
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
 Discuss Question
Answer: Option D. -> 10 minutes
Question 6. Which particles are negatively charged
  1.    alpha
  2.    beta
  3.    gamma
  4.    none of the above
 Discuss Question
Answer: Option B. -> beta
Question 7. Fusion occurs when nuclei
  1.    split
  2.    combine
  3.    mutate
  4.    gain energy
 Discuss Question
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
 Discuss Question
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
 Discuss Question
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
 Discuss Question
Answer: Option A. -> neutrons and protons only

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