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 49 of 63
- A. Radioactive Iodine
- B. Radioactive Carbon
- C. Radioactive Sodium
- D. Radioactive Phosphorous
Explanation: Radio-Iodine is absorbed mostly by the thyroid gland. Radioactive Iodine, often in the form of Iodine-131 (I-131), is commonly used in the…
Correct answer: Radioactive Iodine- A. Strontium-90
- B. Carbon-14
- C. Iodine-131
- D. Cobalt-60
Explanation: Carbon-14 is a widely used and versatile radioactive tracer in various scientific fields.
Correct answer: Carbon-14- A. Cannot be separated at all
- B. Have similar chemical behavior
- C. Occur well separated in nature
- D. Cannot be separated by physical method
Explanation: Chemical properties of all the isotopes of an element are similar, because the chemical properties of an element depend upon the number of…
Correct answer: Have similar chemical behavior- A. Z=2A
- B. Z = A/2
- C. Z = A
- D. Z= √A
Explanation: Taking example of Carbon, 126C, it is evident that Z= A/2This relation stands true for most light nuclei.
Correct answer: Z = A/2- A. λ = 2T
- B. λ =2/T
- C. λ =1/T
- D. λT = In2
Explanation: λT1/2 = 0.693T1/2 = 0.693/ λThus, option D represents the correct relation.
Correct answer: λT = In2- A. kg/s
- B. hour
- C. s/kg
- D. s-1
Explanation: The decay constant can be written as -dN/N/dt.Thus, the SI unit of the decay constant comes out to be s-1.
Correct answer: s-1- A. 938 mg
- B. 31 mg
- C. 62 mg
- D. 16 mg
Explanation: Amount remaining after n half-lives = 1/2n(mo)Number of half-lives, n = t/ T1/2 = 6400/1600= 4Amount remaining after 4 half-lives =…
Correct answer: 62 mg- A. 15 minutes
- B. 7 minutes
- C. 5 minutes
- D. 3.75 minutes
Explanation: After 3T1/2 the sample decayed = 7/8 N3T1/2 = 15 minT1/2= 5 min
Correct answer: 5 minutes- A. 0%
- B. 50%
- C. 25%
- D. 75%
Explanation: After 60 years, 2 half lives will have passed so after first half life 50% of sample will be left and after second half life , half of the…
Correct answer: 25%- A. 12 x 10^32
- B. 3 x 10^32
- C. 6 x 10^32
- D. 6 x 10^4
Explanation: Number of half-lives, n = 26h/6.5hr = 4Amount remaining after n half-lives = 1/2n( No)Amount remaining after 4 half-lives = 1/24 (No)=…
Correct answer: 3 x 10^32- A. A helium atom with two electrons removed
- B. An aggregate of two or more electrons
- C. A hydrogen atom
- D. The ultimate unit of positive charge
Explanation: α-particles are helium nuclei (atom with two electrons removed). The charge on them is +2e while their mass is 4u that is every α-particle…
Correct answer: A helium atom with two electrons removed- A. 214Po (Z = 84)
- B. 214At (Z = 85)
- C. 210Pb (Z = 82)
- D. 218Po (Z = 84)
Explanation: 21484Po → 21082Pb + 42HeThus, Polonium is formed.
Correct answer: 210Pb (Z = 82)973. A beta particle is:
- A. A Helium nucleus
- B. A radioactive element
- C. An electron or a positron
- D. Any negative particle
Explanation: Option C is correct because β particles are the fast moving electrons or positrons which come out of the nucleus of a radioactive element.
Correct answer: An electron or a positron- A. Must be very reactive chemically
- B. Has an atomic number that is one more than that of "X"
- C. Has a mass number that is one less than that of "X"
- D. Must be radioactive
Explanation: This statement is accurate. When a β-particle is emitted, the atomic number of the resulting atom is one greater than that of the original…
Correct answer: Has an atomic number that is one more than that of "X"- A. A - 1 , Z - 1
- B. A + 1 , Z - 1
- C. A, Z-1
- D. A, Z+1
Explanation: For β+ decay, Z will decrease 1 unit and A will not change.Option C is correct because mass number (A) is zero and atomic number (Z) is -1…
Correct answer: A, Z-1- A. 3
- B. 5
- C. 4
- D. 6
Explanation: 23592U → 20782Pb + 742He + 40-1eThus, 4 beta particles are emitted.
Correct answer: 4- A. 6, 2
- B. 7, 2
- C. 6 ,3
- D. 7, 3
Explanation: AZX + 10n → 2 42He + 0-1eAtomic mass of nucleus, A = 8-1 = 7Atomic number of nucleus = Z = 4-1 = 3
Correct answer: 7, 3978. An a-particle is emitted from 88Ra226, what is the mass and atomic number of the daughter nucleus?
- A. 224, 84
- B. 220, 80
- C. 222, 86
- D. 226, 87
Explanation: Atomic mass number of the resulting nucleus, A = 226 -4 = 222Atomic number of resulting nucleus, Z = 88 - 2 = 86
Correct answer: 222, 86- A. Hardness
- B. Masses
- C. Densities
- D. Half-lives
Explanation: This is the most accurate option for identifying and characterizing radioactive materials.
Correct answer: Half-lives- A. Kr and Ba
- B. Xe and Sr
- C. Sn and Mo
- D. All of them
Explanation: According to the equations, Kr, Ba, Sn, Mo, and Sr all are formed as fragments.
Correct answer: All of them