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.
Last updated
1,254 questions · page 31 of 63
- A. 3 neutrons
- B. 3 protons
- C. 3 electrons
- D. None of these
Explanation: There are a total of three extra 'neutrons'.
Correct answer: 3 neutrons- A. α- particles
- B. X-rays
- C. Laser
- D. β- particles
Explanation: 'X-rays' are commonly produced in X-ray tubes by accelerating electrons through a potential difference (a voltage drop) and directing them…
Correct answer: X-rays603. What will happen in a time of 7 hours, if a radioactive substance has an average life of 7 hours?
- A. Half of the active nuclei decay
- B. Less than half of the active nuclei decay
- C. More than half of the active nuclei decay
- D. Total nuclei decay
Explanation: Option A) Half of the active nuclei is incorrect because the half-life is defined as the time it takes for half of the active nuclei to…
Correct answer: More than half of the active nuclei decay- A. Uranium
- B. Radium
- C. Thorium
- D. All of the above options are correct
Explanation: Substances that disintegrate (or decay) by the spontaneous emission of radiation are called radioactive substances.
Correct answer: All of the above options are correct- A. Spontaneous
- B. Stimulated
- C. Both Options A and B are correct
- D. None of these options is correct
Explanation: Spontaneous Emissions and stimulated Emissions are both types of emissions. If an atom is in an excited state.
Correct answer: Both Options A and B are correct- A. H
- B. O
- C. U
- D. None of these options are correct
Explanation: The nucleus of Hydrogen is made up of one proton and zero neutrons. The nucleus of Oxygen is made up of 8 protons and 8 neutrons.
Correct answer: U- A. Emits
- B. Absorbs
- C. Both Option A and B are correct
- D. Reflects
Explanation: A black body is an idealized object that absorbs all electromagnetic radiation it comes into contact with.
Correct answer: Both Option A and B are correct- A. Neutrons
- B. Protons
- C. Electrons
- D. All of these options are correct
Explanation: All isotopes have the same number of protons and the same number of electrons.
Correct answer: Neutrons- A. 783 eV
- B. 783 keV
- C. 783 GeV
- D. 783 Tev
Explanation: Beta-decay occurs when, in a nucleus with too many protons or too many neutrons, one of the protons or neutrons is transformed into the…
Correct answer: 783 keV- A. Quarks
- B. Baryons
- C. Bosons
- D. Photons
Explanation: Quarks make up protons and neutrons, which, in turn, make up an atom's nucleus. Each proton and each neutron contain three quarks.
Correct answer: Quarks- A. 4 days
- B. 6 days
- C. 2 days
- D. 3 days
Explanation: Nt = No (½)t/2Here, Nt is the amount at time t, No is the initial amount of radioactive substance and T is the half-life.
Correct answer: 4 days- A. Outside the nucleus
- B. Inside the nucleus
- C. Electron transition
- D. None of these options are correct
Explanation: Gamma rays are produced in the disintegration of radioactive atomic nuclei and in the decay of certain subatomic particles.
Correct answer: Inside the nucleus- A. 8.01 x 10^10 Bq
- B. 5.6 x 10^11 s-1
- C. 5.6 x 10^12 Bq
- D. 12 x 10^11 Bq
Explanation: A=λN0e(-λt)where λ = decay constantA= (8.3*10-10)* (6.7*1021) * (e) (-8.3 x 10-10*0) = 5.561 *1012
Correct answer: 5.6 x 10^12 Bq- A. 2.9 x 10^-3 s
- B. 1.6 x 10^3 s
- C. 3.9 x 10^3 s
- D. 2.9 x 10^3 s
Explanation: T1/2 = ln 2/𝞴 = 0.693/ 4.3 x 10-4 = 1.6 x 103 where 𝞴 = decay constant.
Correct answer: 1.6 x 10^3 s- A. Ozone
- B. Hydrogen
- C. Sodium
- D. All of these
Explanation: Ozone, Hydrogen and Sodium are all not radioactive because they have stable nuclei.
Correct answer: All of these- A. Square
- B. Rectangle
- C. Sphere
- D. Circular
Explanation: If a nucleus becomes stretched in any particular direction, it tends to break into parts because some of its protons and neutrons are too…
Correct answer: Sphere- A. Isotopes
- B. Isobars
- C. Isomers
- D. Isotherms
Explanation: Isobars are nuclei that have the same mass number (A), but a different atomic number (Z).
Correct answer: Isobars- A. 1
- B. 1200
- C. 1300
- D. None of these
Explanation: Electron is 1836 times lighter than that of a neutron. We may say that the ratio of mass of electron to mass of neutron is 1836:1.
Correct answer: None of these- A. C-14
- B. N-14
- C. O-14
- D. Be-14
Explanation: Carbon decays by a process called beta-decay. During this process, an atom of C-14 decays into an atom of N-14, during which one of the…
Correct answer: N-14- A. True
- B. False
- C. May depend on some conditions
- D. None of these options is correct
Explanation: X-rays are commonly produced in x-ray tubes by accelerating electrons through a potential difference and directing them onto a target metal.
Correct answer: False