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 34 of 63
- A. Neutrons
- B. Electrons
- C. Nucleus
- D. Protons
Explanation: The incident radiation on gold nuclei in the gold foil experiment were scattered by the nucleus.
Correct answer: Nucleus- A. 6000
- B. 5000
- C. 4000
- D. 3000
Explanation: The half-life (T₁/₂) of an element can be calculated using the formula: T₁/₂ = 0.693 / λ where λ is the decay constant, which can be…
Correct answer: 3000- A. Its speed is less than other radiations
- B. It is composed of different lights
- C. It is originated from non radioactive element
- D. None of these
Explanation: The answer is none of these. White light is not harmful radiation because it is not energetic enough to cause damage to cells.
Correct answer: None of these- A. Proton
- B. Two protons
- C. Two neutrons
- D. None of these options are correct
Explanation: The charge on electron= -1.6 × 10-19 CThe charge on proton= +1.6 × 10-19 CElectrons have an electric charge of −1, which is equal but…
Correct answer: Proton- A. An isotone of the original one
- B. An isotope of the original one
- C. An isobar of the original one
- D. None of these options are correct
Explanation: Let AZX be the nucleusAfter a decay,the resulting nucleus will be A-4Z-2XFurther,A-4Z-2X undergoes β decay two timesHence the resultant…
Correct answer: An isotope of the original one- A. m.k
- B. m/k
- C. k/m
- D. None of these options are correct
Explanation: Wein's Constant:According to Wien's law the product of wavelength corresponding to maximum intensity of radiation and temperature of body…
Correct answer: m.k- A. 1/2
- B. 2
- C. 4
- D. 1/4
Explanation: We have t/t1/2 = 40 hours/20 hours=2Thus,A= Ao/2t/t1/2 A=Ao/22 A=Ao/4So one fourth of the original activity will remain after 40 years.
Correct answer: 1/4- A. Mass
- B. Density
- C. Volume
- D. Binding energy
Explanation: As the mass number A increases, this causes an increase in volume of the nucleus,hence density remains constant.The volume of the nucleus…
Correct answer: Density- A. H
- B. O
- C. U
- D. None of these
Explanation: 'Atomic number' is the number of protons and electrons in an element, and 'Mass number' is the sum of neutrons and protons in an element…
Correct answer: U- A. 0.693λ
- B. 0.693/λ
- C. λ/0.693
- D. 1/λ
Explanation: Nt = N0e-λt. N0 = initial quantity. Nt = quantity after time t . t = time period. λ = decay constant Nt = N0/2. t = t1/2.
Correct answer: 0.693/λ- A. Higher
- B. Smaller
- C. Equal
- D. None of these options is correct
Explanation: The speed of photons in a vacuum is greater than in liquid water. In a vacuum, such as outer space, photons travel at the speed of light…
Correct answer: Higher- A. Mass
- B. Charge
- C. Time
- D. Area
Explanation: The effect of radiation on a body absorbing it relates to a quantity called absorbed dose (D).
Correct answer: Mass- A. Full life decay
- B. Quarter life decay
- C. Time for half of the element to decay
- D. All of these options are correct
Explanation: Half life is the time that it takes for half of the original value of some amount of a radioactive element to decay.
Correct answer: Time for half of the element to decay- A. Skin burning
- B. High blood pressure
- C. Fever
- D. Any of these symptoms can be seen
Explanation: Being exposed to a lot of radiation over a short period of time, such as from a radiation emergency, can cause skin burns.
Correct answer: Any of these symptoms can be seen- A. 120 Ci
- B. 200 Ci
- C. 240 Ci
- D. 280 Ci
Explanation: half life T= 2.7 dayshalf life T= 2.7 days 24hour3600secondshalf life T= 233280 smass m= 1 mg= 10-3gAtomic mass= 198 g/molactivity A…
Correct answer: 240 Ci- A. 93.75 %
- B. 6.25 %
- C. 25 %
- D. 75 %
Explanation: Half life T= 5 minGiven time t=20 minNumber of half lives n = giventime/half life n= t/T n= 20/5 n= 4Formula to find the number of atoms…
Correct answer: 93.75 %- A. Copper-60
- B. Cobalt-60
- C. Gold
- D. Silver
Explanation: Cobalt-60 emits two high energy gamma rays, making cobalt-60 both an internal and external hazard.
Correct answer: Cobalt-60- A. Interference
- B. Polarization
- C. Absorption
- D. Diffraction
Explanation: A beta particle, also called beta ray or beta radiation is a high-energy, high-speed electron or positron.
Correct answer: Diffraction- A. N = A+Z
- B. N = AZ
- C. N = A - Z
- D. N = Z - A
Explanation: The number of neutrons is equal to the difference between the mass number of the atom (A) and the atomic number (Z).number of neutrons =…
Correct answer: N = A - Z- A. 12 g
- B. 6 g
- C. 2 g
- D. 8 g
Explanation: Mi = 24 gmf= 3 gTotal time t = 36 min24g→12g→6g→3gIt takes 3 half lives so n= 3As, n = total time/ half life 1 Half life T = t/nT =36/ 3 1…
Correct answer: 12 g