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CBSE Questions for Class 12 Medical Physics Nuclei Quiz 11 - MCQExams.com

The temperature required for the process of nuclear fusion is nearly:
  • 1000K
  • 104K
  • 105K
  • 107K
Nuclear binding energy is equivalent to 
  • Mass of proton
  • Mass of neutron
  • Mass of nucleus
  • Mass detect of nucleus
The accepted unit of atomic and molecular mass is:
  • kilogram 
  • gram 
  • pound
  • atomic mass unit
Nuclear reaction are given as
(i) (n,p)15p32(ii)(p,a)8O16 (iii)74(  p)6C14 
missing particles (in box ) in these reactions are respectively
  • S, F, 0n1
  • F, S, 0n1
  • Be, F, 0n1
  • None of these
Which of the following particles are constituents of the nucleus
  • Protons and electrons
  • Protons and electrons
  • Neutrons and electrons
  • Neutrons and positrons
Assertion : Separation of isotope is possible because of the difference in electron numbers of isotope
Reason : Isotope of an element can be separated by using a mass spectrometer.
  • If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • If assertion is true but reason is false.
  • If the assertion and reason both are false
  • If assertion is false but reason is true.
Which substance is discovered by the Prafulla Chandra Ray the inventor of Indian Chemical Industry ?
  • Sodium Chloride
  • Mercurus Nitrate
  • Nitre
  • Sal Ammonia
What type of energy is used to run submarine?
  • Wind energy
  • Ocean energy
  • Atomic energy
  • None of these
The nucleus with highest binding energy per nucleon is:
  • 23892U
  • 42He
  • 168O
  • 5626Fe
A nuclear reaction of 40% efficiency has 1014 decays / second. If the energy obtained per fission is 250MeV, then power of reactor is:
  • 2kW
  • 4kW
  • 1.6kW
  • 3.2kW
In the decay of 23892 into 20682Pb the number of emitted α and β particles are respectively :
  • 8,8
  • 6,6
  • 6,8
  • 8,6
On absorbing energy 22Ne nucleus decays into a-particle and an unknown nucleus. The unknown nucleus is :
  • Oxygen
  • Boron
  • Silicon
  • Carbon
The binding energy per nucleon for a deuterium nucleus is 1.115 MeV. Mass defect for this nucleus is about :
  • 2.23 u
  • 0.0024 u
  • 0.027 u
  • Data is insufficient
What is atomic mass of He in amu (u) units?
  • 8
  • 9
  • 2
  • 4
Which nuclear reaction takes place in an atom bomb?
  • Nuclear fission
  • Nuclear fusion
  • Radioactivity
  • Combustion
A stationary body explodes into two fragments each of rest mass 1kg that move apart at speed of 0.6c relative to the original body. The rest mass of the original body is:-
  • 2 kg
  • 2.5 kg
  • 1.6 kg
  • 2.25 kg

The correct statement is

42152.PNG
  • The nucleus 63Li can emit an alpha particle
  • The nucleus 21084Po can emit a proton.
  • Deuteron and alpha particle can undergo complete fusion.
  • The nuclei 7030Zn and 8234Se can undergo complete fusion.
The energy required to separate the typical middle mass nucleus 12050Sn into its constituent nucleons is :
(Mass of 12050Sn= 119.902199 amu; mass
of proton=1.007825 amu and mass of neutron=1.008665 amu)
  • 921 MeV
  • 821 MeV
  • 1021 MeV
  • 1121 MeV
In the reaction 7N14+ 2He48O17+ 1H1. The minimum energy of α-particle is
MN= 14.00307 amu      MHe= 4.00260 amu
Mo= 16.99914 amu      MH= 1.00783 amu
  • 1.21MeV
  • 1.62MeV
  • 1.89MeV
  • 1.96MeV
The kinetic energy (in keV) of the alpha particle, when the nucleus 21084Po at rest undergoes alpha decay, is

42152.PNG
  • 5319
  • 5422
  • 5707
  • 5818
Atomic masses of 147N and 168O are 14.008 amu and 16.000 amu respectively. The mass of 11H atom is 1.007825 amu and the mass of neutron is 1.008665 amu. Pick the correct option 
  • 147N is more stable than 168O
  • 168O is more stable than 147N
  • Both are not stable
  • Both are equally stable
The mass of chlorine (17Cl35) atom is 34.98 amu, mass of proton = 1.007825 amu, mass of neutron= 1.008665 amu. Then binding energy is :
  • 287.83 Mev
  • 287.83 joules
  • 8.22Mev
  • 8.22joule
Assume that two deuteron nuclei in the core of fusion reactor at temperature T are moving towards each other, each with kinetic energy 1.5kT, when the separation between them is large enough to neglect Coulomb potential energy. Also neglect any interaction from other particles in the core. The minimum temperature T required for them to reach a separation of 4×1015 m is in the range
  • 1.0×109K<T<2.0×109K
  • 2.0×109K<T<3.0×109K
  • 3.0×109K<T<4.0×109K
  • 4.0×109K<T<5.0×109K
A radioactive nucleus undergoes a series of decays according to the sequence
AβA1αA2αA3
If the mass number and atomic number of A3 are 172 and 69respectively, then the mass number and atomic number of A is
  • 56,23
  • 180,72
  • 120,52
  • 84,38
Parto of the uranium decay series is shown
92U23890Th23491Pa23492U23490Th23088Ra226
How many pairs of isotopes are there in the above series :
  • 1
  • 2
  • 3
  • 0
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 reaction is ϵ positive ? 

40544.jpg
  • (i) and (iv)
  • (i) and (iii)
  • (ii) and (iv)
  • (ii) and (iii).
Match list I and list II.
           List I                                                                                         List II
A. 21H+31H42He+10n+17.6MeV                        1. Artificial radioactivity 

B. 23592U+10n14356Ba+9036Kr+310n+200Mev      2. Isodiaphers

C. 2313Al+42He3014Si+11H                                          3. Atom Bomb

D. mZAαm4Z2B                                                                 4. Nuclear Fissio                                                                                                                          Nuclear Fusion
  • A - 5; B - 3,4; C - 1; D - 2
  • A - 2; B - 3,4; C - 1; D - 5
  • A - 1,5; B - 3; C - 4; D - 2
  • A - 3,4; B - 1; C - 5; D - 4,2
During a β  positive decay experiment it is observed that kinetic energy of β  positive particle is 50% of Q value of the reaction, then select the correct alternative 
  • Almost remaining 50% energy must be in form of kinetic energy of daughter nucleus.
  • Almost remaining 50% energy must be lost in form of heat.
  • Almost remaining 50% energy must be taken away by neutrino.
  • Almost remaining 50% energy must be taken away by antineutrino.
A helium atom, a hydrogen atom and a neutron have masses of 4.003u, 1.008u and 1.009u (unified atomic mass units), respectively. Assuming that hydrogen atoms and neutrons can fuse to form helium, what is the binding energy of a helium nucleus?
  • 2.01u
  • 3.031u
  • 1.017u
  • 0.031u
When the number of nucleons in nuclei increase, the binding energy per nucleon
  • increases continuously with mass number
  • decreases continuously with mass number
  • remains constant with mass number
  • first increases and then decreases with increase of mass number
A beam of 16MeV deutrons from a cyclotron falls on a copper block. The beam is equivalent to a current of 15μA. At what rate do the deutrons strike the block?
  • 9.4×109
  • 9.4×107
  • 9.4×1011
  • 9.4×1013
In an αdecay, the kinetic energy of αparticle is 48 MeV and Q value of the reaction is 50 MeV. The mass number of the mother nucleus is: - (Assume that daughter nucleus is in ground state)
  • 96
  • 100
  • 104
  • none of these
The binding energy of an electron in the ground state of He atom is E0=24.6eV. The  energy required to remove both the electrons from the atom is 
  • 24.6eV
  • 79.0eV
  • 54.4eV
  • None of these
Find the binding energy of valence electron in the ground state of a Li atom if the wavelength of the sharp series is known to be λ1 =813nm and the short wave cutoff wavelength λ2, =350nm
  • 3.54eV
  • 5.32eV
  • 1.5eV
  • 4.32eV
The above is a plot of binding energy per nucleon Eb, against the nuclear mass M; A, B,C, D, E, 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 ε positive?

76381_4942c2fb57cf451cb2c9a8ebc4538cb4.png
  • (i) and (iii)
  • (ii) and (iv)
  • (ii) and (iii)
  • (i) and (iv)
A fusion reaction consists of combining four protons into an α - particle. The mass of α - particle is 4.002603amu and that of proton is 1.007825amu
  • the equation 4p11He24 does not satisfy conservation of charge
  • the correct reaction equation may be 4p11He24+2β++2υ where β+ is positron and υ is the neutrino (zero rest mass and uncharged)
  • loss of mass in the reaction is 0.028697amu
  • the energy equivalent of the mass defect is 26.7MeV
Statement 1: Binding energy of 8O15 is less than 7N14
Statement 2 : Nuclear force is independent of the charge on the nucleons. For isobars, the difference in binding energies is mainly due to the difference in proton-proton coulombic repulsion
  • Statement 1 is True, Statement 2 is True; Statement 2 is a correct explanation for Statement 1
  • Statement 1 is True, Statement 2 is True; Statement 2 is NOT a correct explanation for Statement 1
  • Statement 1 is True, Statement 2 is False
  • Statement 1 is False, Statement 2 is True.
The following deuterium reactions and corresponding reaction energies are found to occur
14N(d,p)15N,Q=8.53MeV
15N(d,α)13C,Q=7.58MeV
13C(d,α)11B,Q=5.16MeV
The rotation 14N(d,p)15N represents the reaction 14N+d15N+p
42He=4.0026amu,21He=2.014amu,11H=1.0078amu,n=1.0087amu(1amu=931MeV)
The Q values of the reaction 11B(α,n)14N is
  • 0.5eV
  • 0.5MeV
  • 0.05MeV
  • 0.05eV
The rest mass of a deuteron is equivalent to an energy of 1876 MeV, that of a proton to 939 MeV, and that of a neutron to 940 MeV. A deuteron may disintegrate to a proton and a neutron if it
  • emits an X-ray photon of energy 2 MeV
  • captures an X-ray photon of energy 2 MeV
  • emits an X-ray photon of energy 3 MeV
  • captures an X-ray photon of energy 3 MeV
Assuming that about 20 MeV of energy is released per fusion reaction 1H2+1H22He4+E+ other particles, then the mass of 1H2 consumed per day in a fusion reactor of power 1 megawatt will approximately be
  • 0.001 g
  • 1 g
  • 10.0 g
  • 1000 g
If mass of U235=235.12142amu, mass of U236=236.1205amu, and mass of neutron 1.008665amu, then the energy required to remove one neutron from the nucleus of U236 is nearly about
  • 75MeV
  • 6.5MeV
  • 1eV
  • zero
In the nuclear reaction given by 2He4+7N141H1+X the nucleus X is
  • nitrogen of mass 16
  • nitrogen of mass 17
  • oxygen of mass 16
  • oxygen of mass 17
The binding energies per nucleon of deutreron (1H2) and helium (2He4) atoms are 1.1MeV and 7MeV. If two deuteron atoms react to form a single helium atom, then the energy released is
  • 13.9MeV
  • 26.9MeV
  • 23.6MeV
  • 19.2MeV
What would be the energy required to dissociate completely 1g of Ca40 into its constituent particles?
Given: Mass of proton =1.007277amu,
           Mass of neutron =1.00866amu,
           Mass of Ca40=39.97545amu
           (Take 1amu=931MeV)
  • 4.813×1024MeV
  • 4.813×1024eV
  • 4.813×1023MeV
  • none of the above
Calculate the binding energy of a deuteron atom, which consists of a proton and a neutron, given that the atomic mass of the deuteron is 2.014102 u 
  • 0.002388 MeV
  • 2.014102 MeV
  • 2.16490 MeV
  • 2.224 MeV
A stationary thorium nucleus (A=220,Z=90) emits an alpha particle with kinetic energy Eα. What is the kinetic energy of the recoiling nucleus?
  • Eα108
  • Eα110
  • Eα55
  • Eα54
Rank the following nuclei in order from largest to smallest value of the binding energy per nucleon:
(i) 42He, (ii) 5224Cr, (iii) 15262Sm, (iv) 10080Hg, (v) 25292Cf
  • E(i)=E(ii)=E(iii)=E(iv)=E(v)
  • E(v)>E(iv)>E(iii)>E(ii)>E(i)
  • E(i)>E(ii)>E(iii)>E(iv)>E(v)
  • E(ii)>E(iii)>E(iv)>E(v)>E(i)
Mark the correct statement(s)
  • for an exothermic reaction, if Q value is +12.56MeV and the KE of incident particle is 2.44MeV, then the total KE of products of reaction is 15.00 MeV
  • for an exothermic reaction, if Q value is +12.56MeV and the KE of incident particle is 2.44MeV, then the total KE of products of reaction is 12.56 MeV
  • For an endothermic reaction, if we give the energy equal to |Q| value of reaction, then the reaction will be carried out
  • for an exothermic reaction, the BE per nucleon of products should be greater than the BE per nucleon of reactants
In the nuclear reaction presented above, the "other particles" might be
  • an alpha particle, which consists of two protons and neutrons
  • two protons
  • one protons and one neutron
  • two neutrons
Binding energy per nucleon is maximum
  • for lighter order elements (low mass number)
  • for heavier order elements (high mass number)
  • for middle order elements
  • equal for all order elements
0:0:2


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