Nuclear Physics MCQs for MDCAT Practice

Physics section, Nuclear Physics chapter. Sample questions from past PMC papers.

1. Question 1
   Structure of Nucleus successfully explained by:
   • A.Bohr
   • B.Millikan
   • C.J.J. Thomson
   • D.Rutherford
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2. Question 2
   When gamma photon is entered in nucleus it _______
   • A.De-excites the atom
   • B.Excites the atom
   • C.Scatters by atom
   • D.None of these
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3. Question 3
   Radioactive 90Sr has a half-life of 30 years. What percent of a sample of 90Sr will remain after 60 years?
   • A.0%
   • B.50%
   • C.25%
   • D.75%
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4. Question 4
   Which type of radiation do explosions give off?
   • A.Neutron radiation
   • B.Alpha radiation
   • C.Gamma radiation
   • D.All of them
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5. Question 5
   The half-life of a radioactive isotope is 140 days. In how many days does the decay rate of a sample of this isotope decrease to one-fourth of its initial decay rate?
   • A.35
   • B.280
   • C.105
   • D.210
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6. Question 6
   What is a radioactive tracer? Describe one application in i medicine.
   • A.radioactive tracer is a substance that emits radiation and is used to detect leaks in underground pipes.
   • B.radioactive tracer is a substance that emits radiation and is used to sterilize medical equipment.
   • C.radioactive tracer is a substance that emits radiation and is used to treat cancer by destroying tumor cells.
   • D.radioactive tracer is a substance that emits radiation and is used to measure the age of rocks and fossils.
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7. Question 7
   A nucleus emits: 2 alpha particles 1 beta minus particle Net change in atomic number is:
   • A.Z-4
   • B.Z-3
   • C.Z-2
   • D.Z-1
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8. Question 8
   A source contains initially N0 nuclei of a radioactive nuclide. How many of these nuclei have decayed after a time interval of three half-lives?
   • A.N0/8
   • B.2N0/3
   • C.N0/3
   • D.7N0/8
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