Free PDF Download of CBSE Class 12 Physics Chapter 13 Nuclei Assertion Reason Questions for Class 12 Physics. Class 12 Physics Assertion Reason Questions with Answers were Prepared Based on the Latest Exam Pattern. Students can solve NCERT Class 12 Physics Nuclei to know their preparation level.
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Nuclei Class 12 Assertion Reason Questions
The following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false and R is also false.
Assertion (A) : Two protons can attract each other.
Reason (R) : The distance between the protons within the nucleus is about 10–15 m.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A) : The nuclear force becomes weak if the nucleus contains too many protons compared to neutrons.
Reason (R) : The electrostatic forces weaken the nuclear force
(c) A is true but R is false.
Assertion (A) : For the fission of heavy nuclei, neutrons are more effective than protons.
Reason (R) : Neutrons are heavier than protons.
(b) Both A and R are true but R is not the correct explanation of A.
Assertion (A) : Energy is released in a nuclear reaction.
Reason (R) : In any nuclear reaction the reactants and resultant products obey the law of conservation of charge and mass only.
(c) A is true but R is false.
Assertion (A) : Density of all the nuclei is same.
Reason (R) : Radius of nucleus is directly proportional to the cube root of mass number.
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A) : There is a chain reaction when uranium is bombarded with slow neutrons.
Reason (R) : When uranium is bombarded with slow neutrons more neutrons are produced
(a) Both A and R are true and R is the correct explanation of A.
Assertion (A) : Cadmium rods used in a nuclear reactor, control the rate of fission.
Reason (R) : Cadmium rods speed up the slow neutrons.
(c) A is true but R is false.
Assertion (A) : A fission reaction can be more easily controlled than a fusion reaction.
Reason (R) : The percentage of mass converted to energy in a fission reaction is 0.1% whereas in a fusion reaction it is 0.4%
(b) Both A and R are true but R is not the correct explanation of A.
Assertion (A) : Thermonuclear fusion reactions may become the source of unlimited power for the mankind.
Reason (R) : A single fusion event involving isotopes of hydrogen produces more energy than energy from nuclear fission of a single uranium
(c) A is true but R is false.
Assertion : Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion.
Reason : For heavy nuclei, binding energy per nucleon increases with increasing Z while for light nuclei it decreases with increasing Z.
(d) A is false and R is also false.
Assertion (A): The mass of a nucleus is less than the sum of the masses of its individual nucleons.
Reason (R): The mass deficit is converted into binding energy, according to Einstein’s mass-energy equivalence principle.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Nuclear fission is the process of splitting a heavy nucleus into lighter nuclei.
Reason (R): Nuclear fission releases a large amount of energy and is the principle behind the operation of nuclear reactors.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Nuclear fusion is the process of combining light nuclei to form a heavier nucleus.
Reason (R): Nuclear fusion releases a tremendous amount of energy and powers the Sun and other stars.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The binding energy per nucleon is higher for heavier nuclei compared to lighter nuclei.
Reason (R): In heavier nuclei, the attractive nuclear force overcomes the electrostatic repulsion between protons, resulting in higher binding energy per nucleon.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The energy released in nuclear reactions is much larger than that in chemical reactions.
Reason (R): Nuclear reactions involve changes in the nucleus, which have much higher energy densities compared to chemical reactions involving electrons.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The process of radioactive decay is a random and spontaneous process.
Reason (R): Radioactive decay occurs due to the instability of certain nuclei, leading to the emission of particles or radiation.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The half-life of a radioactive substance is constant and independent of the initial quantity of the substance.
Reason (R): The half-life is the time taken for half of the radioactive nuclei to decay, and it remains constant for a particular radioactive isotope.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Gamma rays are high-energy electromagnetic waves emitted during radioactive decay.
Reason (R): Gamma rays have the highest penetration power among the three types of radiation emitted during radioactive decay.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Neutrons can induce nuclear fission in certain nuclei.
Reason (R): Neutrons can be absorbed by certain nuclei, leading to their splitting into smaller fragments and releasing additional neutrons.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Nuclear reactions involving the conversion of mass into energy obey the law of conservation of mass energy.
Reason (R): According to Einstein’s mass-energy equivalence (E=mc^2), mass can be converted into energy and vice versa.
Answer: (a) Both A and R are true and R is the correct explanation of A.
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