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Home/MDCAT/MDCAT Physics Nuclear Physics Test Online

MDCAT Physics Nuclear Physics Test Online

Mustansar KhanLast Updated: May 26, 2025

Physics Atomic spectra MCQS Online Test

MDCAT Physics Atomic spectra Chapter Online Test

Total Questions:	49
Time Allowed:	25 Minutes
Total Marks:	49
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	MDCAT Entry Test Physics Online Test Interview Questions about Physics All Universities Entrance Test Recruitments Tests

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1. Which cells are most sensitive to radiation?
Muscle cells
Nerve cells
Reproductive and bone marrow cells
Skin cells

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2. What happens to the mass number during beta decay?
Decreases by 1
Increases by 1
Remains the same
Becomes zero

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3. Biological damage due to radiation depends on:
Temperature
Color of radiation
Pressure
Type and energy of radiation

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4. How is a beta-minus particle represented?
⁰₋₁e
⁴₂He
⁰₀γ
¹₀n

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5. Which of the following emits beta particles?
Helium-4
Uranium-238
Radon-222
Iodine-131

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6. Which of the following is NOT an ionizing radiation?
Alpha
Gamma
Infrared
Beta

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7. The biological half-life of a substance is:
Half of nuclear mass
Time taken to reduce biological effect by half
Time for physical disintegration
Time for half of the radioactivity to disappear

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8. Which of these is NOT a biological effect of radiation?
Enhanced memory
Tissue damage
Gene mutation
Cancer

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9. The relationship between half-life (T½) and decay constant (λ) is:
T½ = 2λ
T½ = ln2/λ
T½ = 1/λ²
T½ = λ/ln2

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10. Radiotracers are used in medicine to:
Treat infections
Track chemical processes in the body
Strengthen muscles
Replace bones

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11. What is the role of radioactive isotopes in cancer treatment?
Increase energy
Promote tumor growth
Destroy cancer cells
Regulate blood pressure

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12. Which unit is commonly used to measure radioactive decay?
Tesla
Becquerel
Ampere
Joule

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13. How are radioactive isotopes administered in medical diagnostics?
Worn as patches
Breathed through gas mask
Injected or ingested
Rubbed on skin

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14. Which factor reduces the harmful effects of radiation?
Increased exposure
Heat application
Direct contact
Shielding and distance

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15. Why is ionizing radiation dangerous to living tissues?
It causes fatigue
It increases blood pressure
It ionizes water molecules
It heats the skin

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16. What is the biological risk of prolonged exposure to radiation?
DNA damage and cancer
Muscle cramps
Hair growth
Headache

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17. The decay of radioactive nuclei is:
Deterministic
Predictable per atom
Random and statistical
Reversible

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18. The law of radioactive decay is:
Quadratic
Logarithmic
Exponential
Linear

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19. In medical imaging, radioactive isotopes are used because they:
Are non-reactive
Last long in the body
Emit detectable radiation
Do not decay

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20. Which device can detect and measure radioactive decay?
Voltmeter
Barometer
Geiger-Müller counter
Spectrometer

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21. Which radiation is a helium nucleus?
Gamma
Alpha
X-ray
Beta

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22. Which radioactive element is used in radiotherapy?
Uranium-235
Cobalt-60
Thorium
Plutonium

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23. Which radioactive substance is used to detect tumors?
Cobalt-60
Iodine-131
Technetium-99m
Uranium-238

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24. The SI unit of absorbed radiation dose is:
Becquerel
Sievert
Curie
Gray

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25. How many half-lives are needed for a radioactive material to decay to less than 1%?
5
10
7
6

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26. What does the half-life of a radioactive substance represent?
Time for one decay per atom
Time for complete decay
Time to emit one particle
Time to decay half the nuclei

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27. Which part of the body is most vulnerable to radiation-induced cancer?
Lungs
Bones
Stomach
Skin

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28. The decay constant (λ) has units of:
m/s²
kg/m³
Seconds⁻¹
Seconds

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29. Radiation therapy is mainly used for treating:
Diabetes
Kidney failure
Cancer
Heart disease

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30. Radiation dose depends on:
Type of radiation
Distance from source
Duration of exposure
All of the above

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31. Which radiation has the highest ionizing power?
Beta
Alpha
Gamma
X-rays

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32. What type of radiation is used in PET scans?
Gamma
Positron
Alpha
Beta

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33. What type of decay decreases atomic number by 2?
Neutron emission
Beta
Gamma
Alpha

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34. Which radiation is most penetrating?
Beta
Gamma
Alpha
Neutron

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35. During radioactive decay, which law is obeyed?
Law of inertia
Boyle’s law
Law of constant pressure
Law of conservation of mass-energy

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36. The most effective protection from alpha particles is:
Skin or paper
Plastic bag
Aluminum sheet
Lead block

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37. Which quantity determines how quickly a radioactive material decays?
Volume
Pressure
Half-life
Mass

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38. Which of the following is used to measure radiation exposure?
Barometer
Geiger counter
Thermometer
Galvanometer

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39. What kind of isotope is used in carbon dating?
Carbon-14
Carbon-12
Carbon-13
Cobalt-60

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40. Which isotope is used in the treatment of thyroid disorders?
Cobalt-60
Radon-222
Iodine-131
Uranium-238

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41. Which of the following is a characteristic of radioactive decay?
Dependent on temperature
Predictable and scheduled
Spontaneous and random
Induced by light

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42. If a sample has 100 grams and a half-life of 5 days, how much remains after 15 days?
12.5 g
50 g
25 g
6.25 g

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43. What protects best against gamma radiation?
Wood
Lead
Paper
Aluminum

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44. The rate of decay is proportional to:
Mass of substance
Number of undecayed nuclei
Volume of material
Square of number of atoms

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45. Which of these is a short-term biological effect of radiation?
Radiation sickness
Genetic mutation
Birth defects
Cancer

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46. A material has a half-life of 10 years. How much will remain after 30 years?
1/8
1/2
1/4
1/3

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47. Sievert is the unit of:
Absorbed dose
Exposure
Ionization
Biological effect of radiation

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48. Which of the following is used to sterilize medical instruments?
Microwaves
Gamma rays
Alpha particles
Beta particles

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49. What is meant by radioactive decay?
Breaking of chemical bonds
Spontaneous emission of particles from an unstable nucleus
Splitting of atoms by electricity
Emission of electrons from metals

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Mustansar KhanLast Updated: May 26, 2025

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Mustansar Khan

Hey Exam Warriors! I'm Mustansar Khan, your ally in conquering tests. Uncover strategies, real-time experiences, and expert advice to turn your study sessions into victories. Let's gear up for success!

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