Free Nuclear Physics MCQs with Answers
1,254 Nuclear Physics MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Atomic nuclei contain protons and neutrons, with nuclear size, mass defect and binding energy describing their stability. The work covers alpha, beta and gamma decay, decay equations, half-life and decay rate, along with radiation safety and medical applications such as imaging, radiotherapy and tracers.
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1,254 questions · page 7 of 63
- A. Amount of element present
- B. Temperature
- C. Pressure
- D. None
Explanation: The half-life of a radioactive element depends only on the nature of the radioactive element.
Correct answer: None- A. 12.5%
- B. 8.5%
- C. 87.5%
- D. 25.1%
Explanation: The half-life of a radioactive substance is the time it takes for half of the radioactive atoms in a sample to decay.
Correct answer: 87.5%- A. 1/2
- B. 1/4
- C. 1/8
- D. 1/16
Explanation: The half-life of radium is 1600 years. This means that after 1600 years, half of the radium atoms in a sample will have decayed.
Correct answer: 1/16- A. 10 days
- B. 8 days
- C. 5 days
- D. 6 days
Explanation: Initial mass = 40g Final mass = 1.25g Number of haalf lives = n Initial mass x (1 / 2)n = final mass (1 / 2)n = final mass / initial mass…
Correct answer: 10 days125. A radioactive substance has a half-life of four months, three-fourth of the substance will decay in:
- A. 3 months
- B. 4 months
- C. 8 months
- D. 12 months
Explanation: t1/2 = 4 months Amount of substance left: 1 - 3 / 4 = 0.25 Number of half lives=n (1 / 2)n = amount of substance left (1 / 2)n = 0.25 ==>…
Correct answer: 8 months- A. 3.9 x 10^3 s
- B. 2.9 x 10^-1 s
- C. 2.9 x 10^3 s
- D. 1.6 x 10^-4 s
Explanation: decay constant = 4.3 x 103 s-1 t1/2 = ? t1/2 = 0.693 / decay constant t1/2 = 0.693 / 4.3 x 103 t1/2 = 1.6 x 10-4 s .
Correct answer: 1.6 x 10^-4 s- A. 2 seconds
- B. 5 seconds
- C. 4 seconds
- D. 6 seconds
Explanation: Radioactivity drops to = 1 / 64 of original value Number of half lives = n (1 / 2)n = 1 / 64 (1 / 2)6 = 1 / 64 n = 6 Total time = 30…
Correct answer: 5 seconds- A. 50 mg
- B. 50/√2 mg
- C. 25 mg
- D. Zero
Explanation: Half life = 270 days Total time given = 540 days Number of half-lives => n = 540 / 270 = 2 Initial mass = 100mg Final mass = 100 x (1 /…
Correct answer: 25 mg- A. 100 years
- B. 11460 years
- C. 1000 years
- D. 1200 years
Explanation: The explanation is given below: The C-14 to C-12 ratio in the fossil is one-fourth of the ratio in a living animal's bone, meaning only…
Correct answer: 11460 years- A. 1.58 mg
- B. 1.25 mg
- C. 1.17 mg
- D. 2.56 mg
Explanation: The explanation is given below: Technetium-99m (Tc-99m) has a half-life of 6 hours. You start with 300 mg of it.
Correct answer: 1.17 mg- A. Neutrons
- B. Photons
- C. Electrons
- D. Neons
Explanation: X-rays emit photons that cause damage to living tissues. As X-rays are absorbed in tissues, they break molecular bonds and create reactive…
Correct answer: Photons- A. Photon
- B. X-rays
- C. Beta
- D. White
Explanation: OPTION B:X-rays are used in medical scanning. Bone is more opaque to X-rays than flesh, therefore if X-rays are allowed to pass through…
Correct answer: X-rays- A. Detect bone fractures
- B. Detect heart diseases
- C. Treat cancer by controIIed exposure
- D. Detect fault in radio receiving circuits
Explanation: In radiotherapy X-rays are used to kill cancer cells. X-rays are a form of high-energy radiation that can damage DNA, the genetic material…
Correct answer: Treat cancer by controIIed exposure- A. Cancer
- B. Lungs
- C. Skin cancer
- D. Thyroid gland
Explanation: Radioactive iodine is absorbed by the thyroid glands. The amount of radioactive iodine absorbed can be measured by a special type of scan…
Correct answer: Thyroid gland- A. lndustries
- B. Electrical machinery
- C. Agriculture
- D. All of these
Explanation: Radioactive phosphorus is used as a tracer to track the movement of phosphorus through the soil into the plants.
Correct answer: Agriculture- A. Cancer
- B. Kidneys
- C. Lungs
- D. Thyroid
Explanation: Explanation is given below: Cobalt-60 (Co-60) is a radioactive isotope of cobalt that has been used in various medical applications…
Correct answer: Cancer- A. Agriculture industry
- B. Medical industry
- C. Support Industry
- D. All of above
Explanation: The explanation is given below: Gamma rays (γ-rays) are the type of electromagnetic radiation commonly used in various medical imaging…
Correct answer: Medical industry- A. Electrons
- B. Protons
- C. Photons
- D. Neutrons
Explanation: The explanation is given below: Gamma (γ) radiation consists of high-energy photons, which are particles of electromagnetic radiation.
Correct answer: Photons- A. Increase by 3
- B. Increase by 5
- C. Decrease by 3
- D. Decrease by 5
Explanation: When W emitts beta radiations, it results in increase of +1 in atomic charge .Further when X emitts alpha radiation it results in decrease…
Correct answer: Decrease by 3- A. After one-minute
- B. After any time
- C. After two minutes
- D. After 1/2 minute
Explanation: Radioactive decay is a spontaneous phenomenon. It can decay anytime.
Correct answer: After any time