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CBSE Questions for Class 12 Medical Physics Nuclei Quiz 10 - MCQExams.com

Among α -decay and β -decay which cause a change of element?
  • Both α -decay and β -decay
  • Only α -decay 
  • Only  β -decay
  • None of them.
The nucleus of mass  M+Δm  is at rest and decays into two daughter nuclei of equal mass  M2  each. Speed of light is  c. This binding energy per nucleon for the parent nucleus is  E1  and that for the daughter nuclei is  E2.  Then :
  • E1=2E2
  • E1>E2
  • E2>E1
  • E2=2E1
Write the S.I. unit of activity.
  • Becquerel
  • Henry
  • Ohm
  • Mendel
The wavelength of  Kα  line for an element of atomic number  43  is  λ.  Then the wavelength of  Kα  line for an element of atomic number  29  is
  • 4329λ
  • 4228λ
  • 94λ
  • 49λ
A scientist carries out an experiment using a sealed source which emits β -particles. The range of the β- particles in the air is about 30cm.
Which precaution is the most effective to protect the scientist from the radiation?
  • handling the source with long tongs
  • keeping the temperature of the source low
  • opening all windows in the laboratory
  • washing his hands before leaving the laboratory
Protons of energy 2eV and 2.5eV successively illuminate a metal whose work function is 0.5eV. The ratio of maximum speed of emitted electron is _______.
  • 3:2
  • 2:1
  • 1:2
  • 2:3
A sample containing same number of two nuclei A and B start decaying. The decay constant of A and B are 10λ and λ. The time after which NANB becomes 1e is 
  • 19λ
  • 118λ
  • 29λ
  • 319λ
The notation for an isotope of sodium 2311Na. Which row gives the composition of a neutral atom of this isotope of sodium?

number of protonsnumber of neutronsnumber of electrons
A111211
B111212
C112311
D121112
  • A
  • B
  • C
  • D
For mass defect of 0.3%, the binding energy of 1kg material is :
  • 2.7×1014erg
  • 2.7×1014J
  • 2.7×1014erg
  • 2.7×1014J
Molecular mass of dry air is ________________.
  • less than moist air
  • greater than moist air
  • equal to moist air
  • may be greater or less than moist air
Which diagram represents a nucleus of 31H?
When the atomic number A of a nucleus increases :
  • initially the neutron-proton ratio is constant
  • initially the neutron-proton per nucleon increases and then decreases
  • initially the binding energy per nucleon increases and then decreases
  • the binding energy per nucleon increases when neutron proton ratio increases
The nuclear radius is given by R=r0A1/3 , where r0 is constant and A is the atomic mass number.
Then :
  • The nuclear mass density of U238 is twice that of Sn119.
  • The nuclear mass density of U238 is thrice that of Sn119
  • The nuclear mass density of U238 is the same as that of Sn119
  • The nuclear mass density of U238 is half that of Sn119
The atomic mass of B10 is 10.811 amu. The binding energy of B10 nucleus is [ Given: The mass of electron is 0.0005498 amu, the mass of proton is mp=1.007276 amu and the mass of neutron is mn=1.008665 amu]:
  • 678.272 MeV
  • 678.932 MeV
  • 378.932 MeV
  • none of these
Radioactivity can be effected by :
  • temperature
  • pressure
  • radiation
  • all of these
A binding energies per nucleon for a deuteron and an α particle are x1 and x2 respectively. What will be the energy Q released in the reaction?
1H2+1H22He4+Q
  • 4(x1+x2)
  • 4(x2x1)
  • 2(x1+x2)
  • 2(x2x1)
The binding energy of Na23 is [ Given : Atomic mass of 22.9898 amu and that of 1H1 is 1.00783 amu]:
  • 931 MeV
  • 186.54 MeV
  • 5.38 MeV
  • none of these
The critical mass of fissionable uranium 235 can be reduced by:
  • surrounding it by neutron absorbing material
  • surrounding it by neutron reflecting material
  • heating the material
  • adding impurities
As comparee to 12C atom , 14C atom has 
  • two extra protons and two extra electrons
  • two extra protons but no extra electrons
  • two extra neutrons and no extra electron
  • two extra neutron and two extra electrons
As the mass number A increases, the binding energy per nucleon in a nucleus
  • increases
  • decreases
  • remains the same
  • varies in a way that depends on the actual value of A
For nuclei with A >100,
  • The binding energy of the nucleus decreases on an average as A increases
  • The binding energy per nucleon decreases on an average as A increases
  • If the nucleus breaks into two roughly equal parts, energy is released
  • If two nuclei fuse to form a bigger nucleus, energy is released.
Isotopes, which undergo spontaneous fission are found in np graph :
  • above the belt of stability
  • below the belt of stability
  • above or below the belt of stability
  • in the belt of stability
When number of nucleons in nuclei increases, the binding energy per nucleon:
  • increases continuously with mass number
  • decreases continuously with mass number
  • remain constant with mass number
  • first increases and then decreases with increase of mass number
α,β and γ radiations come out of a rodiactive substance
  • when it is heated
  • when put in atomic reactor
  • spontaneously
  • under pressure
In nuclear reaction
2He4+ ZXAZ+ 2γA+3+ ZMA
where M denotes
  • electron
  • positron
  • proton
  • neutron
A proton and an alpha particle having same momentum enter a magnetic field at right angles to it. If r1 and r2 be their radii respectively then value of r1/r2 is : 
  • 1
  • 2
  • 1/2
  • 1/4
Group displacement law states that the emission of α or β particles results in the daughter element occupying a position, in the periodic table, either to the left or right of that of the parent element. 

Which one of the following alternatives gives the correct position of the daughter element?
  • On emission of α particle - 2 groups to the right;
    On emission of β particle- 1 group to the right
  • On emission of α particle - 2 groups to the right;
    On emission of β particle- 1 group to the left
  • On emission of α particle - 2 groups to the left;
    On emission of β particle- 1 group to the left
  • On emission of α particle - 2 groups to the left;
    On emission of β particle- 1 group to the right
The 88Ra226 is:
  • n-mesons
  • u-mesons
  • Radioactive
  • Non-radioactive
Nuclear reactivity of Na and Na+ is same because both have:
  • Same electron and proton
  • Same proton and same neutron
  • Different electron and proton
  • Different proton and neutron
Which one of the following nuclear reaction is correct?
  • 6C13+1H17N13+β+v
  • 11Ba23+1H110Ne20+2He4
  • 13Al23+0n111Na23+e0
  • None of these
In the nuclear reaction
92U23882Pb206+x 2He4+y 1β0
the value of x and y are respectively ........
  • 8, 6
  • 6, 4
  • 6, 8
  • 8, 10
Which of the following is radioactive element?
  • Sulphur
  • Polonium
  • Tellurium
  • Selenium
Radioactivity is due to:
  • Stable electronic configuration
  • Unstable electronic configuration
  • Stable nucleus
  • Unstable nucleus
When a radioactive element emits an electron, the daughter element formed will have:
  • Mass number one unit less
  • Atomic number one unit less
  • Mass number one unit more
  • Atomic number one unit more
In the nuclear reaction
1H2+1H22He3+0n1
if the mass of the deuterium atom =2.014741a.m.u, mass of 2He3=3.016977a.m.u and mass of neutron =1.008987a.m.u, then the Q value of the reaction is nearly
  • 0.00352MeV
  • 3.27MeV
  • 0.82MeV
  • 2.45MeV
Consider one of fission reactions of 235U by thermal neutrons 23592U+n9438Sr+14054Xe+2n. The fission fragments are however unstable and they undergo successive β- decay until 9438Sr becomes 9440Zr and 14054Xe becomes 14058Ce. The energy released in this process is
[Given: m(235U)=235.439u; m(n)=1.00866u; m(94Zr=93.9064u; m(140Ce)=139.9055u; 1u=931MeV]
  • 156MeV
  • 208MeV
  • 456MeV
  • Cannot be computed
1.00kg of 235U undergoes fission process. If energy released per event is 200MeV, then the total energy released is
  • 5.12×1024MeV
  • 6.02×1023MeV
  • 5.12×1026MeV
  • 6.02×1026MeV
Binding energy per nucleon of 1H2 and 2He4 are 1.1MeV and 7.0MeV, respectively. Energy released in the process 1H2+1H22He4 is
  • 20.8MeV
  • 16.6MeV
  • 25.2MeV
  • 23.6MeV
Calculate the binding energy of a deutron atom, which consists of a proton and a neutron, given that the atomic mass of the deuteron is 2.014102u
  • 0.002388MeV
  • 2.014102MeV
  • 2.16490MeV
  • 2.224MeV
Mark out the correct statement(s)
  • In alpha decay, the energy released is shared between alpha particle and daughter nucleus in the form of kinetic energy and share of alpha particle is more than that of the daughter
  • In beta decay, the energy released in the form of kinetic energy of beta particles
  • In beta minus decay, the energy released is shared between electron and antineutrino
  • In gamma decay, the energy released is in the form of energy carried by photons termed as gamma rays
Consider the following reaction:
1H2+1H21He4+Q
If m(1H2)=2.0141u; m(2He4)=4.0024u, the energy Q released (in MeV) in this fusion reacion is
  • 12
  • 6
  • 24
  • 48
If the mass of isotope 73Li is 7.016005u and masses of H atom and a neutron are 1.007825u and 1.008665u respectively. The binding of Li nucleus is:
  • 5.6MeV
  • 8.8MeV
  • 0.42MeV
  • 39.2MeV
Which of the following graphs might represent the relationship between atomic number (i.e, "atomic weight") and the total binding energy of the nucleus, for nuclei heavier than 9438Sr?
Choose the correct statements from the following:
  • Like other light nuclei, the 2He4 nuclei also have a low value of the binding energy per nucleon
  • The binding energy per nucleon decreases for nuclei with small as well as large atomic number
  • The energy required to remove one neutron from 3Li7 to transform it into the isotope 3Li6 is 5.6MeV, which is the same as the binding energy per nucleon of 3Li6
  • When two deuterium nuclei fuse together, they give rise to a tritium nucleus accompanied by a release of energy
Binding energy per nucleon for C12 is 7.68MeV and for C13 is 7.74MeV. The energy required to remove a neutron from C13 is
  • 5.49MeV
  • 8.46MeV
  • 49.45MeV$
  • 15.49MeV
When a nucleus in an atom undergoes radioactive decay, the electronic energy levels of the atom
  • do not change for any type of radioactivity
  • change for α and β radioactivity but not for γ- radioactivity
  • change for α- radioactivity but not for others
  • change for β- radioactivity but not for others
Heavy stable nucleus have more neutrons than protons. This is because of the fact that
  • neutrons are heavier than protons
  • electrostatic force between protons are repulsive
  • neutrons decay into protons through beta decay
  • nuclear force between neutrons are weaker than that between protons
Fusion processes, like combining two deuterons to form a He nucleus are impossible at ordinary temperatures and pressure. The reasons for this can be traced to the fact:
  • nuclear forces have short range
  • nuclei are positively charged
  • the original nuclei must be completely ionized before fission can take place
  • the original nuclei must first break up before combining with each other
Mass is measure of the amount of matter.
  • True
  • False
The particle used in nuclear fission for bombardment is:
  • Alpha particle
  • Proton
  • Beta particle
  • Neutron
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Practice Class 12 Medical Physics Quiz Questions and Answers