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CBSE Questions for Class 12 Medical Physics Nuclei Quiz 8 - MCQExams.com

What is the Qvalue of the reaction?
P+7Li4He+4He
The atomic masses of 1H,4He and 7Li are 1.007825u,4.0026034u and 7.016004u respectively.
  • 17.35 MeV
  • 18.06 MeV
  • 177.35 MeV
  • 170.35 MeV
Two radioactive sources X and Y of half lives 1h and 2h respectively initially contain the same number of radioactive atoms. At the end of 2h, their rates of disintegration are in the ratio of :
  • 4:3
  • 3:4
  • 1:2
  • 2:1
The binding energy per nucleon of 8O16 is 7.97MeV and that of 8O17 is 7.75MeV. The energy required to remove one neutron from 8O17 is ___________ MeV.
  • 3.62
  • 3.52
  • 4.23
  • 7.86
Consider the nuclear reaction
X200A110+B90+energy
If the binding energy per nucleon for X,A and B is 7.4MeV,8.2MeV and 8.2MeV respectively . What is the energy released?
  • 200MeV
  • 160MeV
  • 110MeV
  • 90MeV
234U has 92 protons and 234 nucleons total in its nucleus. It decays by emitting an alpha particle. After the decay it becomes.
  • 232U
  • 232Pa
  • 230Th
  • 230Ra
The binding energy per nucleon of C12 is E1 and that of C13 is E2. The energy required to remove one neutron from C13 is
  • 12E1+12E2
  • 13E212E1
  • 12E213E1
  • 13E2+12E1
 A nuclear reaction along with the masses of the particles taking part in it is as follows:
A+BC+D+QMeV
1.002amu+1.004amu1.001amu+1.003amu+Q
The energy Q liberated in the reaction is
  • 1.234MeV
  • 1.862MeV
  • 0.931MeV
  • 0.800MeV
Li nucleus has three protons and four neutrons. Mass of lithium nucleus is 7.03.6005 amu. Mass of proton is 1.007277 amu and mass of neutron is 1.008665 amu. Mass defect for lithium nucleus in amu is 
  • 0.04048
  • 0.04050
  • 0.04052
  • 0.04055
The mass of 7N15 is 15.0011 amu, mass of 8O16 is 15.99492 amu and mP=1.00783 amu. Determine binding energy of last proton of 8O16.
  • 2.13 MeV
  • 0.13 MeV
  • 10 MeV
  • 12.13 MeV
Which of the following statements is correct?
  • The rest mass of a stable nucleus is less than the sum of the rest masses of its separated nucleons
  • The rest mass of a stable nucleus is greater than the sum of the rest masses of its separated nucleons
  • In nuclear fission, energy is released by fusion two nuclei of medium mass(approximately 100amu)
  • None of the above
If M(A, Z), Mp and Mn denote the masses of the nucleus, proton and neutron respectively in units of u(1u=931.5MeV/c2) and BE represents its binding energy in MeV, then.
  • M(A,Z)=ZMp+(AZ)MnBE
  • M(A,Z)=ZMp+(AZ)Mn+BE/c2
  • M(A,Z)=ZMp+(AZ)MnBE/c2
  • M(A,Z)=AMp+(AZ)Mn+BE
Find the binding energy of an electron in the ground state of a hydrogen like atom in whose spectrum the third of the corresponding Balmer series is equal to 108.5 nm
  • 54.4 eV
  • 13.6 eV
  • 112.4 eV
  • None of these
An energy of 24.6eV is required to remove one of the electrons from a neutral helium atom. The energy (in eV) required to remove both the electrons from a neutral helium atom is
  • 38.2
  • 49.2
  • 51.8
  • 79.0
Consider the following statements (X and Y stand for two different elements)
(I) 32X65 and 33Y65 are isotopes.
(II) 42X86 and 42Y85 are isotopes.
(III) 85X174 and 88Y177 have the same number of neutrons.
(IV) 92X235 and 94Y235 are isobars.
The correct statements are
  • II and IV only
  • I, II and IV only
  • II, III and IV only
  • I, II, III and IV
Mass defect for the helium nucleus is 0.0303 amu. Binding energy per nucleon for this (in MeV) will be_______
  • 28
  • 7
  • 4
  • 1
Atomic mass of 136C is 13.00335 amu and its mass number is 13.0. If amu =931MeV, binding energy of the neutrons present in the nucleus is
  • 3.10MeV
  • 974MeV
  • 97.4MeV
  • 9.974MeV
When the radioactive isotope 88Ra226 decays in a series by emission of three alpha(α) and a beta (β) particle, the isotope X which remains undecay is?
  • 83X214
  • 84X218
  • 84X220
  • 87X223
Which  of the following nucleus is fissionable by slow neutrons: 
  • 92U238
  • 93Np239
  • 92U235
  • 2Ile4
An unknown stable nuclide after absorbing a neutron emits an electron, and the new nuclide splits spontaneously into two alpha particles. The unknown nuclide can be
  • 4Be9
  • 3Li7
  • 2He2
  • 5B10
The first controlled nuclear chain reaction took place in which year?
  • 1895
  • 1910
  • 1942
  • 1945
What form of radiation most closest resembles X-rays?
  • alpha
  • beta
  • gamma
  • neutron
A radioactive nucleus of mass M emits a photon of frequency v and the nucleus recoils. The recoil energy will be:
  • hv
  • Mc2hv
  • h2v22Mc2
  • Zero
A γ ray photon produces an electron positron pair. If the rest mass energy of electron is 0.51 Mev and the total kinetic energy of electron - positron pair is 0.78 MeV then the energy of γ- ray photon is Mev is
  • 0.78
  • 1.8
  • 1.28
  • 0.28
A nuclear transformation is denoted by X(n,α)73Li. Which of the following is the nucleus of element X?
  • 126C
  • 105B
  • 95B
  • 114Be
Rn decays into Po by emitting an α  particle with half life of 4 days. A sample contains 6.4 × 1010 atoms of Rn. After 12 days, the number of atoms of Rn left in the sample will be
  • 3.2 × 1010
  • 0.53 × 1010
  • 2.1 × 1010
  • 0.8 × 1010
Which symbol is used to represent the unit of atomic mass, amu?
  • u
  • A
  • M
  • n
126C and 146C are examples of isobars.
  • True
  • False
A nuclear transformation is denoted by X(n,α)73Li. Which of the following is the nucleus of element X?
  • 126C
  • 105B
  • 95B
  • 114Be
The binding energies per nucleon of deuteron (1H2) and helium atom (2He4) are 1.1 MeV and 7 MeV. If two deuteron atoms react to form a single helium atom, then the energy released is
  • 13.9 MeV
  • 26.9 MeV
  • 23.6 MeV
  • 19.2 MeV
In the nuclear fusion reaction
21H+31H42He+n given that the repulsive potential energy between the two nuclei is 7.7×1014J, the temperature at which the gases must be heated to initiate the reaction is nearly (Boltzmann's constant k=1.38×1023J/K)
  • 107K
  • 105K
  • 103K
  • 109K
A radioactive nuclide X decays into nuclei T and Z by simultaneous disintegration as shown. Effective decay constant for the disintegration is
850779_80b0cd1071fb470abf442327af03d53c.png
  • λ1+λ2
  • λ1λ2λ1+λ2
  • λ1+λ22
  • 2λ1λ2λ1+λ2
Decreasing order of atomic weight is correct of the elements given below?
  • Fe>Co>Ni
  • Ni>Co>Fe
  • Co>Ni>Fe
  • Co>Fe>Ni
A collective name for nucleons and other elementary particles that decay into nucleons by the emission of mesons is?
  • Baryon
  • Boson
  • Fermion
  • Hadron
The mass of 17CI35 is 34.9800 amu. Calculate its binding energy (mass of 0n1=1.008665 amu 1H1=1.007825 amu):
  • 2.88MeV
  • 28.8MeV
  • 280MeV
  • 2880MeV
The above is a plot of binding energy per nucleon Eb, against the nuclear mass M; A,B,C,D,E,F correspond to different nuclei. Consider four reactions:
(i) A+BC+ε
(ii) CA+B+ε
(iii) D+EF+ε
(iv) FD+E+ε
where ε is the energy released? In which reactions is ε positive. 
1012881_d579c18cb1ad47c2a72c66e7471a494b.PNG
  • (ii) and (iv)
  • (ii) and (iii)
  • (i) and (iv)
  • (i) and (iii)
A nucleus of mass M+Δm is at rest and decays into two daughter nuclei of equal mass M2 each. Speed of light is cThe binding energy per nucleon for the parent nucleus is E1 and that for the daughter nuclei is E2. Then :
  • E2>2E1
  • E1>E2
  • E2>E1
  • E1=2E2
If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron from the first excited state of Li2+ is:
  • 30.6 eV
  • 13.6 eV
  • 3.4 eV
  • 122.4 eV
When 1020 electrons are removed from a neutral metal plate through some process, the charge on it becomes ______
  • 1.6C
  • +16C
  • +1.6C
  • 1019C
A nuclide A undergoes α decay and another nuclide B undergoes β decay. Then
  • all the αparticles emitted by A will have almost the same speed
  • the αparticles emitted by A may have widely different speeds
  • all the βparticles emitted b B will have almost the same speed
  • the βparticles emitted by B may have widely different speeds.
A small quantity of solution containing 24Na radio-nuclide (half life 15 hours) of activity 1.0 micro-curie is injected into the blood of a person. A sample of the blood of volume 1 cm3 taken after 5 hours shows an activity of 296 disintegrations per minute. Determine the total volume of blood in the body of the person. Assume that the radio active solution mixes uniformly in the blood of the person.
(1 curie=3.7×1010 disintegrations per second).
  • 5.95 Litre.
  • 5 Litre.
  • 55 Litre.
  • 7 Litre.
Statement 1: Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion and
Statement II: For heavy nuclei, binding energy per nucleon increases with increasing Z while for light nuclei it decrease with increasing Z
  • Statement 1 is false, statement 2 is true
  • Statement 1 is false, statement 2 is true, statement 2 is correct explanation for statement 1
  • Statement 1 is false, statement 2 is true, statement 2 is not the correct explanation for statement 1
  • Statement 1 is true, statement 2 is false
A nuclear transformation is denoted by X(n,α) 73Li. Which of the following is the nucleus of element X?
  • 12C6
  • 105B
  • 95B
  • 114Be
The energy of thermal neutron is about :
  • 25 MeV
  • 0.51 MeV
  • 25 meV
  • 1.02 MeV
Binding Energy per nucleon of a fixed nucleus X4 is 6 MeV. It absorbs a neutron moving with KE=2 MeV, and converts into Y at ground state, emitting a photon of energy 1 MeV. The Binding Energy per nucleon of Y (inMev) is:
  • (6A+1)(A+1)
  • (6A1)(A+1)
  • 7
  • 76
What would be the energy required to dissociate completely 1 g of Ca (40) into its constituent particles? 
Given: Mass of proton = 1.007277 amu,
Mass of neutron = 1.00866 amu,
Mass of Ca-40= 39.97545 amu
(take amu = 931 MeV)
  • 4.813×1024MeV
  • 4.813×1024 eV
  • 4.813×1023
  • None of the above
In Q26, find the initial activity of sample.
  • 6.79 ×1016 disintegration/sec
  • 5.79 ×1015 disintegration/sec
  • 10 ×1015 disintegration/sec
  • none of these.
The binding energy per nucleon of 73Li and 42He nuclei are 5.60 MeV and 7.06 Me V, respectively. In the nuclear reaction 73Li+11He42H+42He+Q the value of energy Q released is
  • -2.4 MeV
  • 8.4 MeV
  • 17.3 MeV
  • 19.6 MeV
If I excitation energy for the H like (hypothetical) sample is 24 eV, then binding energy in III excired state is:
  • 2 eV
  • 3 eV
  • 4 eV
  • 5 eV

Binding energy per nucleon versus mass number curve for nuclei is shown in fig.W, X, Y, and Z are four nuclei indicated on the curve. The process that would release energy is 


1022919_3f507c795fb043019d2243fd97d029fc.png
  • Y2Z
  • WX+Z
  • W2Y
  • XY+Z 
A stationary U238 nucleus undergoes α- decay. If the kinetic energy of product nucleus is E, the total energy released  in the process is-
  • E
  • 58.5E
  • 59.5E
  • 60.5E
0:0:2


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