Q. In nuclear fission, the mass of the products is less than the mass of the reactants. What is this mass difference called? (2019)
A.
Nuclear mass
B.
Binding energy
C.
Mass defect
D.
Fission energy
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Solution
The mass difference in nuclear fission is referred to as the mass defect, which is converted into energy according to Einstein's equation E=mc².
Correct Answer: C — Mass defect
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Q. In nuclear fission, the mass of the products is less than the mass of the reactants. What is this mass difference converted into? (2019)
A.
Kinetic energy
B.
Potential energy
C.
Binding energy
D.
Radiation
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Solution
The mass difference in nuclear fission is converted into kinetic energy of the fission fragments, according to Einstein's equation E=mc².
Correct Answer: A — Kinetic energy
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Q. In nuclear fission, what is released as a result of the reaction? (2022)
A.
Energy and neutrons
B.
Only energy
C.
Only neutrons
D.
Protons and electrons
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Solution
Nuclear fission releases a significant amount of energy and additional neutrons, which can induce further fission reactions.
Correct Answer: A — Energy and neutrons
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Q. In nuclear fission, what is released? (2022)
A.
Energy and neutrons
B.
Only energy
C.
Only neutrons
D.
Protons and electrons
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Solution
Nuclear fission releases a significant amount of energy and additional neutrons, which can induce further fission reactions.
Correct Answer: A — Energy and neutrons
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Q. In nuclear reactions, what is conserved? (2022)
A.
Mass only
B.
Charge only
C.
Mass and charge
D.
Energy only
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Solution
In nuclear reactions, both mass and charge are conserved, which is a fundamental principle of physics.
Correct Answer: C — Mass and charge
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Q. What is the charge of a neutron? (2022)
A.
Positive
B.
Negative
C.
Neutral
D.
Depends on the isotope
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Solution
A neutron has no charge; it is electrically neutral.
Correct Answer: C — Neutral
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Q. What is the charge of a proton? (2023)
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Solution
A proton carries a positive charge of +1 elementary charge.
Correct Answer: C — +1
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Q. What is the energy released in nuclear fusion primarily due to? (2023)
A.
Mass defect
B.
Chemical bonds
C.
Nuclear forces
D.
Electromagnetic interactions
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Solution
The energy released in nuclear fusion is primarily due to the mass defect, where the mass of the resulting nucleus is less than the sum of the masses of the individual nucleons.
Correct Answer: A — Mass defect
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Q. What is the main consequence of nuclear fusion? (2023)
A.
Release of energy
B.
Formation of heavier elements
C.
Emission of alpha particles
D.
All of the above
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Solution
The main consequence of nuclear fusion is the release of a significant amount of energy as lighter nuclei combine to form heavier nuclei.
Correct Answer: A — Release of energy
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Q. What is the main difference between isotopes of an element? (2022)
A.
Number of protons
B.
Number of neutrons
C.
Number of electrons
D.
Chemical properties
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Solution
Isotopes of an element differ in the number of neutrons while having the same number of protons.
Correct Answer: B — Number of neutrons
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Q. What is the main force that holds the nucleus together? (2020)
A.
Electromagnetic force
B.
Gravitational force
C.
Weak nuclear force
D.
Strong nuclear force
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Solution
The strong nuclear force is the primary force that holds the nucleons (protons and neutrons) together in the nucleus.
Correct Answer: D — Strong nuclear force
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Q. What is the main product of the fusion of hydrogen nuclei? (2022)
A.
Helium
B.
Carbon
C.
Oxygen
D.
Nitrogen
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Solution
The fusion of hydrogen nuclei primarily produces helium, along with a release of energy.
Correct Answer: A — Helium
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Q. What is the mass defect of a nucleus? (2019)
A.
The difference between the mass of the nucleus and the sum of the masses of its individual nucleons
B.
The mass of the nucleus itself
C.
The mass of the electrons surrounding the nucleus
D.
The mass of the nucleus in a different state
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Solution
The mass defect is the difference between the mass of the nucleus and the sum of the masses of its individual nucleons, which accounts for the binding energy.
Correct Answer: A — The difference between the mass of the nucleus and the sum of the masses of its individual nucleons
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Q. What is the primary application of nuclear fusion? (2023)
A.
Nuclear power plants
B.
Hydrogen bombs
C.
Medical imaging
D.
Smoke detectors
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Solution
Nuclear fusion is primarily applied in hydrogen bombs, where fusion reactions release immense energy.
Correct Answer: B — Hydrogen bombs
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Q. What is the primary product of nuclear fission? (2019)
A.
Energy
B.
Neutrons
C.
Protons
D.
Alpha particles
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Solution
The primary product of nuclear fission is energy, along with neutrons and smaller nuclei.
Correct Answer: A — Energy
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Q. What is the primary product of the fission of Uranium-235? (2019)
A.
Helium
B.
Neutrons
C.
Barium and Krypton
D.
Carbon
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Solution
The fission of Uranium-235 primarily produces Barium and Krypton along with additional neutrons.
Correct Answer: C — Barium and Krypton
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Q. What is the primary product of the fusion of hydrogen nuclei in stars? (2022)
A.
Helium
B.
Carbon
C.
Oxygen
D.
Nitrogen
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Solution
The primary product of hydrogen fusion in stars is helium, which occurs through the proton-proton chain reaction.
Correct Answer: A — Helium
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Q. What is the primary product of the fusion of hydrogen nuclei? (2022)
A.
Helium
B.
Carbon
C.
Oxygen
D.
Deuterium
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Solution
The primary product of the fusion of hydrogen nuclei (protons) is helium, along with the release of energy.
Correct Answer: A — Helium
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Q. What is the primary reason for the stability of a nucleus? (2022)
A.
Number of protons
B.
Number of neutrons
C.
Ratio of neutrons to protons
D.
Size of the nucleus
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Solution
The stability of a nucleus is primarily determined by the ratio of neutrons to protons, which affects the balance of forces within the nucleus.
Correct Answer: C — Ratio of neutrons to protons
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Q. What is the process called when a nucleus emits an alpha particle? (2019)
A.
Beta decay
B.
Gamma decay
C.
Alpha decay
D.
Fission
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Solution
The emission of an alpha particle from a nucleus is known as alpha decay.
Correct Answer: C — Alpha decay
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Q. What is the process of converting a neutron into a proton called? (2020)
A.
Beta decay
B.
Alpha decay
C.
Gamma decay
D.
Fission
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Solution
Beta decay is the process in which a neutron is converted into a proton, emitting an electron and an antineutrino.
Correct Answer: A — Beta decay
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Q. What is the role of moderators in nuclear reactors? (2023)
A.
To increase the temperature
B.
To slow down neutrons
C.
To absorb radiation
D.
To enhance fission
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Solution
Moderators are used in nuclear reactors to slow down fast neutrons, making them more likely to induce fission in the fuel.
Correct Answer: B — To slow down neutrons
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Q. What is the significance of the mass defect in a nucleus? (2023)
A.
It indicates the stability of the nucleus
B.
It is the mass of the nucleus
C.
It is the mass of the electrons
D.
It has no significance
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Solution
The mass defect is the difference between the mass of the nucleus and the sum of the masses of its individual nucleons, indicating the stability and binding energy of the nucleus.
Correct Answer: A — It indicates the stability of the nucleus
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Q. What type of decay involves the conversion of a neutron into a proton? (2023)
A.
Alpha decay
B.
Beta decay
C.
Gamma decay
D.
Positron emission
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Solution
Beta decay involves the conversion of a neutron into a proton, emitting a beta particle (electron).
Correct Answer: B — Beta decay
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Q. What type of decay involves the conversion of a proton into a neutron? (2019)
A.
Alpha decay
B.
Beta plus decay
C.
Beta minus decay
D.
Gamma decay
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Solution
Beta plus decay involves the conversion of a proton into a neutron, emitting a positron.
Correct Answer: B — Beta plus decay
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Q. Which element is commonly used in nuclear reactors as fuel? (2022)
A.
Uranium-235
B.
Carbon-12
C.
Hydrogen-1
D.
Oxygen-16
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Solution
Uranium-235 is commonly used as fuel in nuclear reactors due to its ability to sustain a chain reaction.
Correct Answer: A — Uranium-235
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Q. Which force is primarily responsible for holding the nucleus together? (2022)
A.
Gravitational force
B.
Electromagnetic force
C.
Weak nuclear force
D.
Strong nuclear force
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Solution
The strong nuclear force is responsible for holding the protons and neutrons together in the nucleus.
Correct Answer: D — Strong nuclear force
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Q. Which force is responsible for holding the nucleus together? (2019)
A.
Gravitational force
B.
Electromagnetic force
C.
Weak nuclear force
D.
Strong nuclear force
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Solution
The strong nuclear force is responsible for holding the protons and neutrons together in the nucleus.
Correct Answer: D — Strong nuclear force
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Q. Which of the following is a characteristic of nuclear fusion? (2023)
A.
Releases energy
B.
Requires high temperature
C.
Occurs in stars
D.
All of the above
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Solution
Nuclear fusion releases energy, requires high temperatures, and occurs in stars, making all options correct.
Correct Answer: D — All of the above
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Q. Which of the following is a characteristic of nuclear reactions compared to chemical reactions? (2023)
A.
Involves electrons
B.
Involves large energy changes
C.
Involves only valence electrons
D.
Involves breaking of chemical bonds
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Solution
Nuclear reactions involve large energy changes due to the conversion of mass into energy, unlike chemical reactions.
Correct Answer: B — Involves large energy changes
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