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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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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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