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 Β· page 44 of 63
- A. Mass
- B. Density
- C. Volume
- D. Binding energy
Explanation: As the mass number A increases, this causes an increase in the volume of the nucleus; hence, density remains constant.
Correct answer: Density862. For an unknown element X the wavelength recorded is 2.9x10A-2 m, the half life of element is _ years
- A. 50
- B. 100
- C. 1000
- D. None of these
Explanation: The question presents a scenario where the wavelength of electromagnetic radiation associated with an element X is given, but asks for theβ¦
Correct answer: None of these- A. Alpha
- B. Beta
- C. Gamma
- D. All of these
Explanation: Correct option is C. The radiation reached on earth by sun are gamma rays.
Correct answer: Gamma- A. Released
- B. Absorbed
- C. Reflected
- D. All of these
Explanation: Fission reactions involve the breakdown of the nucleus to form smaller nuclei. This process releases a huge amount of thermal energy.
Correct answer: Released- A. Quarks have fixed spin directions
- B. Quarks are elementary particles
- C. Quarks are constituents of protons and neutrons
- D. Quarks cannot exist freely in nature
Explanation: The correct answer is that quarks have fixed spin directions, which is incorrect. Quarks can have spins oriented in either direction.
Correct answer: Quarks have fixed spin directions- A. H+
- B. C+
- C. Na+
- D. He2+
Explanation: Option D is correct because an alpha particle consists of 2 protons and 2 neutrons, which corresponds to a helium nucleus.
Correct answer: He2+- A. 1/6
- B. 3/2
- C. 1/8
- D. 1/2
Explanation: Correct Option: CThis option is correct because after one half-life. NΒ°/2 sample remains and N/2 decays After three half-lives, NΒ°/6β¦
Correct answer: 1/8- A. 6
- B. 8
- C. 14
- D. 20
Explanation: If the (A) of element X is 14 and the (Z) is 6, we can determine the number of neutrons using the equation:Number of neutrons = Massβ¦
Correct answer: 8- A. A
- B. B
- C. C
- D. None of these
Explanation: Beta-particles produced 'two or three absolutely straight thread-like lines' from the direction of an impure radium salt source.
Correct answer: B- A. 2.9 x 10^7π
- B. 1.3 x 10^7π
- C. 1.2 Γ 10β8π
- D. 3.4 Γ 10β8π
Explanation: Using the following formulaT1/2= 0.693/decay constant
Correct answer: 2.9 x 10^7π- A. X-ray
- B. Beta-ray
- C. Gamma-ray
- D. Alpha-ray
Explanation: For internal imaging of braina X-Ray radiographs are used. Some examples include use of X-rays in CAT Scans and MRIs.
Correct answer: X-ray- A. Slow reactors
- B. Fast reactors
- C. Thermal reactors
- D. All of these
Explanation: This option encompasses both slow (thermal) and fast reactors, as they represent the all broad categories of nuclear reactors.
Correct answer: All of these- A. By producing ions in the cells
- B. By increasing the temperature of cells
- C. By decreasing the number of cells
- D. By destroying the cells
Explanation: Radiations are damaging to living organisms because cause ionisation of living cells. STB Pg-341 Hence, option A is correct.
Correct answer: By producing ions in the cells- A. Conserved
- B. Not conserved
- C. Unstable
- D. Stable
Explanation: In beta positive decay, the number of electron is increased by one, but the number of nucleons i.e., neutrons and protons remain constant.
Correct answer: Conserved- A. 3.8 minutes
- B. 3.8 days
- C. 3.8 months
- D. 38 years
Explanation: Half life of radon gas is 3.8 days. Hence, option B is correct.
Correct answer: 3.8 days- A. 3.7 x 10^10 disintegration / s
- B. 3.7 disintegration / s
- C. 7.3 disintegration / S
- D. None
Explanation: As such, 1 Ci is equal to 37 billion (3.7 x 1010) disintegrations per second, so 1 Ci also equals 37 billion (3.7 x 1010) Bequerels (Bq).
Correct answer: 3.7 x 10^10 disintegration / s- A. Medium
- B. Atmosphere
- C. Isotope
- D. Half life
Explanation: For a given number of atoms, isotopes with shorter half-lives decay more rapidly, undergoing a greater number of radioactive decays perβ¦
Correct answer: Isotope- A. Gray
- B. Mass
- C. Rad
- D. Sievert
Explanation: The correct statement is D. Sievert (Sv). The sievert is the SI unit of equivalent dose.
Correct answer: Sievert- A. Constant with time
- B. Varies inversely with time
- C. Decreases exponentially with time
- D. Decreases linearly with time
Explanation: The correct statement is C. Decreases exponentially with time. The decay rate of a radioactive substance decreases exponentially as theβ¦
Correct answer: Decreases exponentially with time- A. 8g
- B. 10g
- C. 11g
- D. 44g
Explanation: To find the remaining amount of a radioactive element after a certain number of half-lives, you can use the formula: Remaining Quantity =β¦
Correct answer: 11g