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Spontaneous And Random Nuclear Decay MDCAT MCQs with Answers

Spontaneous And Random Nuclear Decay MDCAT MCQs

Welcome to the Spontaneous And Random Nuclear Decay MDCAT MCQs with Answers. In this post, we have shared Spontaneous And Random Nuclear Decay Multiple Choice Questions and Answers for PMC MDCAT 2024. Each question in MDCAT Physics offers a chance to enhance your knowledge regarding Spontaneous And Random Nuclear Decay MCQs in this MDCAT Online Test.

Spontaneous And Random Nuclear Decay MDCAT MCQs Test Preparations

What is emitted during alpha decay?
A) Two protons and two neutrons
B) Two electrons and two protons
C) Two neutrons and two positrons
D) One proton and one neutron

Answer
A) Two protons and two neutrons

Which of the following particles is emitted during beta minus decay?
A) Positron
B) Neutron
C) Electron
D) Proton

Answer
C) Electron

During gamma decay, which of the following is emitted?
A) An electron
B) A photon
C) A neutron
D) A proton

Answer
B) A photon

What happens to the atomic number of an element during beta plus decay?
A) Increases by 1
B) Decreases by 1
C) Increases by 2
D) Remains the same

Answer
B) Decreases by 1

The process in which a neutron decays into a proton, electron, and antineutrino is called:
A) Alpha decay
B) Beta minus decay
C) Gamma decay
D) Positron emission

Answer
B) Beta minus decay

The time taken for half the nuclei in a sample to decay is called:
A) Half-life
B) Decay constant
C) Activity
D) Mean life

Answer
A) Half-life

Which of the following statements is true about spontaneous nuclear decay?
A) It requires an external trigger.
B) It is a random process.
C) It only occurs in stable nuclei.
D) It always results in gamma emission.

Answer
B) It is a random process

In positron emission, a proton is converted into a:
A) Neutron and an electron
B) Neutron and a positron
C) Neutron and a neutrino
D) Neutron and an antineutrino

Answer
B) Neutron and a positron

The decay constant is:
A) The probability of decay per unit time
B) The time taken for all nuclei to decay
C) The number of decays per second
D) The amount of energy released during decay

Answer
A) The probability of decay per unit time

What type of radiation is emitted when an unstable nucleus releases excess energy without changing its composition?
A) Alpha radiation
B) Beta radiation
C) Gamma radiation
D) Neutron radiation

Answer
C) Gamma radiation

In beta plus decay, what particle is emitted along with a positron?
A) Electron neutrino
B) Electron antineutrino
C) Neutron
D) Photon

Answer
A) Electron neutrino

The process of a nucleus capturing one of its own orbital electrons is known as:
A) Electron capture
B) Alpha decay
C) Beta decay
D) Positron emission

Answer
A) Electron capture

In spontaneous fission, a nucleus:
A) Absorbs a neutron and splits
B) Splits into smaller nuclei without neutron absorption
C) Emits a gamma ray
D) Releases a positron

Answer
B) Splits into smaller nuclei without neutron absorption

What is the main difference between alpha and beta decay?
A) Alpha decay emits a helium nucleus, beta decay emits an electron
B) Alpha decay emits an electron, beta decay emits a positron
C) Alpha decay increases atomic number, beta decay decreases it
D) Alpha decay is slower than beta decay

Answer
A) Alpha decay emits a helium nucleus, beta decay emits an electron

What type of decay decreases the mass number by 4?
A) Beta decay
B) Alpha decay
C) Gamma decay
D) Neutron decay

Answer
B) Alpha decay

The emission of radiation by unstable nuclei is known as:
A) Radiation therapy
B) Radioactive decay
C) Nuclear fusion
D) Nuclear fission

Answer
B) Radioactive decay

Which type of decay involves the emission of an antineutrino?
A) Alpha decay
B) Beta minus decay
C) Gamma decay
D) Beta plus decay

Answer
B) Beta minus decay

In nuclear decay, what does the term “spontaneous” mean?
A) The decay occurs due to external stimuli
B) The decay occurs without external stimuli
C) The decay can be predicted accurately
D) The decay does not produce radiation

Answer
B) The decay occurs without external stimuli

The random nature of nuclear decay means:
A) The rate of decay can be controlled
B) The decay occurs at regular intervals
C) It is impossible to predict which nucleus will decay next
D) The decay always releases the same amount of energy

Answer
C) It is impossible to predict which nucleus will decay next

The half-life of a radioactive isotope is the time it takes for:
A) All of the isotope to decay
B) Half of the isotope to decay
C) The isotope to lose its radioactivity
D) The isotope to emit gamma rays

Answer
B) Half of the isotope to decay

What happens to the atomic mass of a nucleus during alpha decay?
A) Decreases by 4 units
B) Increases by 4 units
C) Decreases by 2 units
D) Increases by 2 units

Answer
A) Decreases by 4 units

What type of decay can result in the formation of a different element?
A) Alpha decay
B) Gamma decay
C) Electron capture
D) Both A and C

Answer
D) Both A and C

Which type of radiation has the highest penetrating power?
A) Alpha particles
B) Beta particles
C) Gamma rays
D) Neutrons

Answer
C) Gamma rays

What is the nature of the radiation emitted in gamma decay?
A) Particulate
B) Electromagnetic
C) Positronic
D) Neutrino

Answer
B) Electromagnetic

Which particle is emitted in beta minus decay?
A) Positron
B) Electron
C) Neutron
D) Proton

Answer
B) Electron

What happens to the neutron-to-proton ratio in a nucleus after beta minus decay?
A) Increases
B) Decreases
C) Remains the same
D) Becomes zero

Answer
B) Decreases

The process of positron emission involves:
A) A neutron decaying into a proton
B) A proton decaying into a neutron
C) An electron decaying into a positron
D) A gamma photon decaying into an electron and positron

Answer
B) A proton decaying into a neutron

In electron capture, an electron is absorbed by:
A) The nucleus
B) A neutron
C) A proton
D) A positron

Answer
A) The nucleus

What is a common application of gamma rays?
A) Sterilization of medical equipment
B) Communication signals
C) Power generation
D) Cooking food

Answer
A) Sterilization of medical equipment

The rate at which radioactive decay occurs is measured in:
A) Joules
B) Becquerels
C) Newtons
D) Volts

Answer
B) Becquerels

What type of decay involves the release of two protons and two neutrons?
A) Beta decay
B) Alpha decay
C) Gamma decay
D) Electron capture

Answer
B) Alpha decay

During beta minus decay, what happens to a neutron in the nucleus?
A) It becomes a proton
B) It becomes a positron
C) It is emitted as radiation
D) It remains unchanged

Answer
A) It becomes a proton

What is a characteristic of all types of radioactive decay?
A) They emit alpha particles
B) They involve the release of energy
C) They occur at a constant rate for each element
D) They increase the mass number of the element

Answer
B) They involve the release of energy

Which of the following is true about the half-life of a radioactive substance?
A) It depends on the initial amount of the substance
B) It can be affected by environmental conditions
C) It remains constant for a given isotope
D) It can be increased by heating the substance

Answer
C) It remains constant for a given isotope

Which of the following is NOT a product of spontaneous nuclear decay?
A) Neutrino
B) Neutron
C) Photon
D) Neutron star

Answer
D) Neutron star

What type of radiation is emitted when an excited nucleus returns to its ground state?
A) Alpha radiation
B) Beta radiation
C) Gamma radiation
D) Neutron radiation

Answer
C) Gamma radiation

The term “radioisotope” refers to:
A) Any stable isotope
B) An isotope that emits radiation
C) An isotope that does not undergo decay
D) A synthetic isotope

Answer
B) An isotope that emits radiation

Which decay process increases the atomic number by one?
A) Alpha decay
B) Beta minus decay
C) Beta plus decay
D) Electron capture

Answer
B) Beta minus decay

In nuclear physics, what is a “decay chain?
A) A series of reactions that split an atom
B) A sequence of decays that lead to a stable isotope
C) A reaction that fuses multiple nuclei
D) A process that captures neutrons

Answer
B) A sequence of decays that lead to a stable isotope

The stability of a nucleus is determined by:
A) The total mass of the atom
B) The balance between nuclear forces and electromagnetic repulsion
C) The number of protons alone
D) The number of electrons in orbit

Answer
B) The balance between nuclear forces and electromagnetic repulsion

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