# CBSE Class 12 Physics Nuclei MCQs

Refer to CBSE Class 12 Physics Nuclei MCQs provided below. CBSE Class 12 Physics MCQs with answers available in Pdf for free download. The MCQ Questions for Class 12 Physics with answers have been prepared as per the latest syllabus, CBSE books and examination pattern suggested in Class 12 by CBSE, NCERT and KVS. Multiple Choice Questions for Chapter 13 Nuclei are an important part of exams for Class 12 Physics and if practiced properly can help you to get higher marks. Refer to more Chapter-wise MCQs for CBSE Class 12 Physics and also download more latest study material for all subjects

## MCQ for Class 12 Physics Chapter 13 Nuclei

Class 12 Physics students should refer to the following multiple-choice questions with answers for Chapter 13 Nuclei in Class 12. These MCQ questions with answers for Class 12 Physics will come in exams and help you to score good marks

### Chapter 13 Nuclei MCQ Questions Class 12 Physics with Answers

Question : The constituents of nucleus are

(a) electrons and protons
(b) protons and neutrons
(c) neutrons and electrons
(d) electrons, protons and neutrons

Question : The radius of a nucleus is

(a) directly proportional to its mass number
(b) inversely proportional to its atomic weight
(c) directly proportional to the cube root of its mass number
(d) None of these

Question : A nuclei having same number of neutron but different number of protons / atomic number are called

(a) isobars
(b) isomers
(c) isotones
(d) isotopes

Question : When the number of nucleons in nuclei increases, the binding energy per nucleon

(a) increases continuously with mass number
(b) decreases continuously with mass number
(c) remains constant with mass number
(d) first increases and then decreases with increase of mass number

Question : The mass of an atomic nucleus is less than the sum of the masses of its constituents. This mass defect is converted into

(a) heat energy
(b) light energy
(c) electrical energy
(d) energy which binds nucleons together

Question : Nuclear forces are

(a) spin dependent and have no non-central part
(b) spin dependent and have a non-central part
(c) spin independent and have no non-central part
(d) spin independent and have a non-central part

Question : On an average, the number of neutrons and the energy of a neutron released per fission of a uranium atom are respectively

(a) 2.5 and 2 keV
(b) 3 and l keV
(c) 2.5 and 2 MeV
(d) 2 and 2 keV

Question : A moderator is used in nuclear reactors in order to

(a) slow down the speed of the nuetrons
(b) acceleerate the neutrons
(c) increase the number of neutrons
(d) decrease the number of neutrons

Question : Fusion reactions take place at high temperature because

(a) atoms are ionised at high temperature
(b) molecules break up at high temperature
(c) nuclei break up at high temperature
(d) kinetic enrgy is high enough to overcome repulsion between nuclei

Question : For a nuclear fusion process, suitable nuclei are

(a) any nuclei
(b) heavy nuclei
(c) lighter nuclei
(d) nuclei lying in the middle of periodic table

Question : Chadwick was awarded the 1935 nobel prize in physics for his discovery of the
(a) electron
(b) proton
(c) neutron
(d) positron

Question : The element gold has
(a) 16 isotopes
(b) 32 isotopes
(c) 96 isotopes
(d) 173 isotopes

Question : The nuclear radius is of the order of
(a) 10–10 m
(b) 10–6 m
(c) 10–15 m
(d) 10–14 m

Question : Particles which can be added to the nucleus of an atom without changing its chemical properties are called
(a) neutrons
(b) electrons
(c) protons
(d) alpha particles

Question : The radius of a nucleus is
(a) directly proportional to its mass number
(b) inversely proportional to its atomic weight
(c) directly proportional to the cube root of its mass number
(d) None of these

Question : Nucleus of an atom whose atomic mass is 24 consists of
(a) 11 electrons, 11 protons and 13 neutrons
(b) 11 electrons, 13 protons and 11 neutrons
(c) 11 protons and 13 neutrons
(d) 11 protons and 13 electrons

Question : The electrons cannot exist inside the nucleus because
(a) de-Broglie wavelength associated with electron in β -decay is much less than the size of nucleus
(b) de-Broglie wavelength associated with electron in β -decay is much greater than the size of nucleus
(c) de-Broglie wavelength associated with electron in β -decay is equal to the size of nucleus
(d) negative charge cannot exist in the nucleus

Question : In ...X... water is circulated though the reactor vessel and transfers energy to steam generator in the ...Y... Here, X and Y refer to
(a) primary loop, secondary loop
(b) reactor core, turbine
(c) secondary loop, primary loop
(d) turbine, reactor core

Question : A nuclei having same number of neutron but different number of protons / atomic number are called
(a) isobars
(b) isomers
(c) isotones
(d) isotopes

Question : Which one of the following has the identical property for isotopes?
(a) Physical property
(b) Chemical property
(c) Nuclear property
(d) Thermal property

Question : The number of protons in an atom of atomic number Z and mass number A is
(a) zero
(b) Z
(c) A – Z
(d) A

Question : When the number of nucleons in nuclei increases, the binding energy per nucleon
(a) increases continuously with mass number
(b) decreases continuously with mass number
(c) remains constant with mass number
(d) first increases and then decreases with increase of mass number

Question : Mp denotes the mass of a proton and Mn that of a neutron.
A given nucleus, of binding energy B, contains Z protons and N neutrons. The mass M(N, Z) of the nucleus is given
by (c is the velocity of light)
(a) M(N, Z) = NMn + ZMp + B/c2
(b) M(N, Z) = NMn + ZMp – Bc2
(c) M(N, Z) = NMn + ZMp + Bc2
(d) M(N, Z) = NMn + ZMp – B/c2

Question : Mass energy equation was propounded by
(a) Newton
(c) C. V. Raman
(d) Einstein

Question : The mass of an atomic nucleus is less than the sum of the masses of its constituents. This mass defect is converted into
(a) heat energy
(b) light energy
(c) electrical energy
(d) energy which binds nucleons together

Question : Which of the following statement is not true regarding Einsteins mass energy relation?
(a) Mass disappears to reappear as energy.
(b) Energy disappears to reappear as mass.
(c) Mass and energy are two different forms of the same entity.
(d) Mass and energy can never be related to each other.

Question : The curve of binding energy per nucleon as a function of atomic mass number has a sharp peak for helium nucleus. This implies that helium
(a) can easily be broken up
(b) is very stable
(c) can be used as fissionable meterial

Question : Nuclear forces are
(a) spin dependent and have no non-central part
(b) spin dependent and have a non-central part
(c) spin independent and have no non-central part
(d) spin independent and have a non-central part

Question : Nuclear forces exists between
(a) neutron - neutron
(b) proton - proton
(c) neutron - proton
(d) all of these

Question : The antiparticle of electron is
(a) positron
(b) α-particle
(c) proton
(d) β-particle

Question : Neutron decay in free space is given as follows 0n1 → 1H1 + -1e0 +[] Then the parenthesis [ ] represents a
(a) neutrino
(b) photon
(c) antineutrino
(d) graviton

(a) irreversible process
(b) self disintegration process
(c) spontaneous
(d) all of the above

Question : γ-rays are deflected by
(a) an electric field but not by a magnetic field
(b) a magnetic field but not by an electric field
(c) both electric and magnetic field
(d) neither by electric field nor by magnetic field

Question : Beta rays emitted by a radioactive material are
(b) the electrons orbiting around the nucleus
(c) charged particles emitted by nucleus
(d) neutral particles

Question : Which of the following is not a mode of radioactive decay ?
(a) Positron emission
(b) Electron capture
(c) Fusion
(d) Alpha decay

Question : The half-life period and the mean life period of a radioactive element are denoted respectively by Th and Tm. Then
(a) Th = Tm
(b) Th > T m
(c) Th < Tm
(d) Th ≥ Tm

Question : In γ ray emission from a nucleus
(a) only the proton number changes
(b) both the neutron number and the proton number change
(c) there is no change in the proton number and the neutron number
(d) only the neutron number changes

Question : Artificial radioactivity was discovered by
(a) Klaproth
(b) Rontgen
(c) Irene Curie and Joliot
(d) P. Curie and M. Curie

Question : Radioactive samples are stored in lead boxes because it is
(a) heavy
(b) strong
(c) good absorber

(a) physical changes
(b) chemical changes
(c) electric or magnetic fields
(d) all of the above

Question : A radioactive material undergoes decay by ejecting electrons. The electron ejected in this process is
(a) the electron from the decay of a neutron
(b) the electron present in the nucleus
(c) the resulting from the conversion of γ photon
(d) an orbital electron

Question : The same radioactive nucleus may emit
(a) all the three α, β and γ one after another
(b) all the three α, β and γ radiations simultaneously
(c) only α and β simultaneously
(d) only one α, β and γ at a time

Question : Which of the following of a radioactive material is a measure of its instability?
(a) Full life
(b) Mean life
(c) Half life
(d) None of these

Question : The rate of disintegration at a given instant, is directly proportional to the number of atoms present at that instant. This is the statement of
(b) half life
(d) group displacement law

Question : Fusion reactions take place at high temperature because
(a) atoms are ionised at high temperature
(b) molecules break up at high temperature
(c) nuclei break up at high temperature
(d) kinetic enrgy is high enough to overcome repulsion between nuclei

Question : Three specimens A, B, C of same radioactive element has activities 1 microcurie, 1 rutherford and 1 becquerel respectively. Which specimen has maximum mass?
(a) A
(b) B
(c) C
(d) all have equal masses

Question : Charge on an α-particle is
(a) 1.6 × 10–19 C
(b) 3.2 × 10–19 C
(c) 1.6 × 10–20 C
(d) 4.8 × 10–19 C

Question : If a radioactive element is placed in an evacuated chamber, then the rate of radioactive decay will
(a) decrease
(b) remains unchanged
(c) increase
(d) none of these

Question : The γ radiations are
(a) electromagnetic radiation with high energy
(b) electromagnetic radiation with low energy
(c) charged particles emitted by the nucleus
(d) electrons orbiting the nucleus

(a) α-rays
(b) β-rays
(c) γ-rays
(d) All of the above

Question : The 'rad' is the correct unit used to report the measurement of
(a) the ability of a beam of gamma ray photons to produce ions in a target
(b) the energy delivered by radiation to a target
(c) the biological effect of radiation
(d) the rate of decay of a radioactive source

Question : One curie is equal to
(a) 3.7 × 1010 disintegration/sec
(b) 3.2 × 108 disintegration/sec
(c) 2.8 × 1010 disintegration/sec
(d) None of these

Question : Half life of radioactive element depends upon
(a) amount of element present
(b) temperature
(c) pressure
(d) nature of element

Question : For a nuclear fusion process, suitable nuclei are
(a) any nuclei
(b) heavy nuclei
(c) lighter nuclei
(d) nuclei lying in the middle of periodic table

Question : Fusion reaction occurs at temperatures of the order of
(a) 103 K
(b) 107 K
(c) 10 K
(d) 104 K

Question : Control rods used in nuclear reactors are made of
(a) stainless steel
(b) graphite
(d) plutonium

Question : Boron rods in a nuclear reactor are used to
(a) absorb excess neutrons
(b) absorb alpha particle
(c) slow down the reaction
(d) speed up the reaction

Question : A moderator is used in nuclear reactors in order to
(a) slow down the speed of the nuetrons
(b) acceleerate the neutrons
(c) increase the number of neutrons
(d) decrease the number of neutrons

Question : If a star can convert all the He nuclei completely into oxygen nuclei. The energy released per oxygen nuclei is [Mass of He nucleus is 4.0026 amu and mass of Oxygen nucleus is 15.9994 amu]
(a) 7.6 MeV
(b) 56.12 MeV
(c) 10.24 MeV
(d) 23.9 MeV

Question : If 200 MeV energy is released in the fission of a single U235 nucleus, the number of fissions required per second to produce 1 kilowatt power shall be (Given 1eV = 1.6 × 10–19 J)
(a) 3.125 × 1013
(b) 3.125 × 1014
(c) 3.125 × 1015
(d) 3.125 × 1016

Question : A certain mass of Hydrogen is changed to Helium by the process of fusion. The mass defect in fusion reaction is 0.02866 a.m.u. The energy liberated per a.m.u. is (Given : 1 a.m.u = 931 MeV)
(a) 26.7 MeV
(b) 6.675 MeV
(c) 13.35 MeV
(d) 2.67 MeV

(a) irreversible process
(b) self disintegration process
(c) spontaneous
(d) all of the above

Question : Beta rays emitted by a radioactive material are
(b) the electrons orbiting around the nucleus
(c) charged particles emitted by nucleus
(d) neutral particles

Question :  Which of the following is not a mode of a radioactive decay ?
(a) Positron emission
(b) Electron capture
(c) Fusion
(d) Alpha decay

Question : A radioactive material undergoes decay by ejecting electrons. The electron ejected in this process is
(a) the electron from the decay of a neutron
(b) the electron present in the nucleus
(c) the resulting from the conversion of g photon
(d) an orbital electron

Question : The rate of disintegration at a given instant, is directly proportional to the number of atoms present at that instant. This is the statement of
(b) half life
(d) group displacement law

Question : Half life of radioactive element depends upon
(a) amount of element present
(b) temperature
(c) pressure
(d) nature of element

Question : A freshly prepared radioactive source of half life 2 hr emits radiation of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this source is
(a) 6 hr
(b) 12 hr
(c) 24 hr
(d) 128 hr

 CBSE Class 12 Physics Electric Charges and Fields MCQs
 CBSE Class 12 Physics Electrostatic Potential and Capacitance MCQs
 CBSE Class 12 Physics Current Electricity MCQs
 CBSE Class 12 Physics Moving Charges and Magnetism MCQs
 CBSE Class 12 Physics Magnetism and Matter MCQs
 CBSE Class 12 Physics Electromagnetic Induction MCQs
 CBSE Class 12 Physics Alternating Current MCQs
 CBSE Class 12 Physics Electromagnetic Waves MCQs CBSE Class 12 Physics Gravitation MCQs
 CBSE Class 12 Physics Ray Optics and Optical Instruments MCQs
 CBSE Class 12 Physics Wave Optics MCQs
 CBSE Class 12 Physics Dual Nature of Radiation and Matter MCQs
 CBSE Class 12 Physics Atoms MCQs
 CBSE Class 12 Physics Nuclei MCQs
 CBSE Class 12 Physics Semiconductor Electronics Materials Devices and Simple Circuits MCQs
 CBSE Class 12 Physics Communication Systems MCQs

## More Study Material

### CBSE Class 12 Physics Chapter 13 Nuclei MCQs

We hope students liked the above MCQs for Chapter 13 Nuclei designed as per the latest syllabus for Class 12 Physics released by CBSE. Students of Class 12 should download the Multiple Choice Questions and Answers in Pdf format and practice the questions and solutions given in above Class 12 Physics MCQs Questions on daily basis. All latest MCQs with answers have been developed for Physics by referring to the most important and regularly asked topics which the students should learn and practice to get better score in school tests and examinations. Studiestoday is the best portal for Class 12 students to get all latest study material free of cost.

### MCQs for Physics CBSE Class 12 Chapter 13 Nuclei

Expert teachers of studiestoday have referred to NCERT book for Class 12 Physics to develop the Physics Class 12 MCQs. If you download MCQs with answers for the above chapter daily, you will get higher and better marks in Class 12 test and exams in the current year as you will be able to have stronger understanding of all concepts. Daily Multiple Choice Questions practice of Physics and its study material will help students to have stronger understanding of all concepts and also make them expert on all critical topics. You can easily download and save all MCQs for Class 12 Physics also from www.studiestoday.com without paying anything in Pdf format. After solving the questions given in the MCQs which have been developed as per latest course books also refer to the NCERT solutions for Class 12 Physics designed by our teachers

#### Chapter 13 Nuclei MCQs Physics CBSE Class 12

All MCQs given above for Class 12 Physics have been made as per the latest syllabus and books issued for the current academic year. The students of Class 12 can refer to the answers which have been also provided by our teachers for all MCQs of Physics so that you are able to solve the questions and then compare your answers with the solutions provided by us. We have also provided lot of MCQ questions for Class 12 Physics so that you can solve questions relating to all topics given in each chapter. All study material for Class 12 Physics students have been given on studiestoday.

#### Chapter 13 Nuclei CBSE Class 12 MCQs Physics

Regular MCQs practice helps to gain more practice in solving questions to obtain a more comprehensive understanding of Chapter 13 Nuclei concepts. MCQs play an important role in developing understanding of Chapter 13 Nuclei in CBSE Class 12. Students can download and save or print all the MCQs, printable assignments, practice sheets of the above chapter in Class 12 Physics in Pdf format from studiestoday. You can print or read them online on your computer or mobile or any other device. After solving these you should also refer to Class 12 Physics MCQ Test for the same chapter

#### CBSE MCQs Physics Class 12 Chapter 13 Nuclei

CBSE Class 12 Physics best textbooks have been used for writing the problems given in the above MCQs. If you have tests coming up then you should revise all concepts relating to Chapter 13 Nuclei and then take out print of the above MCQs and attempt all problems. We have also provided a lot of other MCQs for Class 12 Physics which you can use to further make yourself better in Physics

Where can I download latest CBSE MCQs for Class 12 Physics Chapter 13 Nuclei

You can download the CBSE MCQs for Class 12 Physics Chapter 13 Nuclei for latest session from StudiesToday.com

Can I download the MCQs of Chapter 13 Nuclei Class 12 Physics in Pdf

Yes, you can click on the links above and download topic wise MCQs Questions PDFs for Chapter 13 Nuclei Class 12 for Physics

Are the Class 12 Physics Chapter 13 Nuclei MCQs available for the latest session

Yes, the MCQs issued by CBSE for Class 12 Physics Chapter 13 Nuclei have been made available here for latest academic session

How can I download the Chapter 13 Nuclei Class 12 Physics MCQs

You can easily access the links above and download the Chapter 13 Nuclei Class 12 MCQs Physics for each topic

Is there any charge for the MCQs with answers for Class 12 Physics Chapter 13 Nuclei

There is no charge for the MCQs and their answers for Class 12 CBSE Physics Chapter 13 Nuclei you can download everything free

How can I improve my MCQs in Class 12 Physics Chapter 13 Nuclei

Regular revision of MCQs given on studiestoday for Class 12 subject Physics Chapter 13 Nuclei can help you to score better marks in exams

What are MCQs for Class 12 Physics Chapter 13 Nuclei

Multiple Choice Questions (MCQs) for Chapter 13 Nuclei Class 12 Physics are objective-based questions which provide multiple answer options, and students are required to choose the correct answer from the given choices.