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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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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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