JEE Main & Advanced Physics Nuclear Physics And Radioactivity Question Bank

done Topic Test - Nuclear Physics and Radioactivity Total Questions - 40

• question_answer1)
  The particles which can be added to the nucleus of an atom without changing its chemical properties are called
  A)
  Electrons done clear
  B)
  Protons done clear
  C)
  Neutrons done clear
  D)
  None of the above done clear
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• question_answer2)
  The masses of neutron and proton are 1.0087 a.m.u. and 1.0073  a.m.u. respectively. If the neutrons and protons combine to form a helium nucleus (alpha particles) of mass 4.0015 a.m.u. The binding energy of the helium nucleus will be (1 a.m.u.= 931MeV)
  A)
  28.4  MeV done clear
  B)
  20.8  MeV done clear
  C)
  27.3  MeV done clear
  D)
  14.2  MeV done clear
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• question_answer3)
  In \[_{88}R{{a}^{226}}\]nucleus, there are                    
  A)
  138 protons and 88 neutrons done clear
  B)
  138 neutrons and 88 protons done clear
  C)
  226 protons and 88 electrons done clear
  D)
  226 neutrons and 138 electrons done clear
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• question_answer4)
  If the binding energy per nucleon in \[L{{i}^{7}}\]and \[H{{e}^{4}}\] nuclei are respectively 5.60 MeV and 7.06 MeV, then energy of reaction \[L{{i}^{7}}+p\to 2{{\ }_{2}}H{{e}^{4}}\] is
  A)
  19.6 MeV done clear
  B)
  2.4 MeV done clear
  C)
  8.4 MeV done clear
  D)
  17.3 MeV done clear
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• question_answer5)
  \[{{M}_{n}}\] and \[{{M}_{p}}\] represent mass of neutron and proton respectively. If an element having atomic mass M has N-neutron and Z-proton, then the correct relation will be      
  A)
  \[M<[N{{M}_{n}}+Z{{M}_{P}}]\] done clear
  B)
  \[M>[N{{M}_{n}}+Z{{M}_{P}}]\] done clear
  C)
  \[M=[N{{M}_{n}}+Z{{M}_{P}}]\] done clear
  D)
  \[M=N[{{M}_{n}}+{{M}_{P}}]\] done clear
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• question_answer6)
  Energy generation in stars is mainly due to
  A)
  Chemical reactions          done clear
  B)
  Fission of heavy nuclei done clear
  C)
  Fusion of light nuclei        done clear
  D)
  Fusion of heavy nuclei done clear
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• question_answer7)
  200 MeV of energy may be obtained per fission of \[{{U}^{235}}\]. A reactor is generating 1000 kW of power. The rate of nuclear fission in the reactor is
  A)
  1000 done clear
  B)
  \[2\times {{10}^{8}}\] done clear
  C)
  \[3.125\times {{10}^{16}}\] done clear
  D)
   931 done clear
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• question_answer8)
  Nuclear fission was discovered by
  A)
  Auto Hahn and F. strassmann done clear
  B)
  Fermi done clear
  C)
  Bethe done clear
  D)
  Rutherford done clear
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• question_answer9)
  In the following reaction the value of ‘X’ is  \[_{7}{{N}^{14}}{{+}_{2}}H{{e}^{4}}\,\to \,X{{+}_{1}}{{H}^{1}}\]            
  A)
  \[_{8}{{N}^{17}}\] done clear
  B)
  \[_{8}{{O}^{17}}\] done clear
  C)
  \[_{7}{{O}^{16}}\]     done clear
  D)
  \[_{7}{{N}^{16}}\] done clear
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• question_answer10)
  1 atomic mass unit is equal to                 
  A)
  \[\frac{1}{25}\] (mass of \[{{F}_{2}}\] molecules) done clear
  B)
  \[\frac{1}{14}\] (mass of \[{{N}_{2}}\] molecules) done clear
  C)
  \[\frac{1}{12}\] (mass of one C-atom) done clear
  D)
  \[\frac{1}{16}\] (mass of \[{{O}_{2}}\] molecules) done clear
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• question_answer11)
  In the reaction \[_{1}^{2}H+_{1}^{3}H\to _{2}^{4}He+_{0}^{1}n\]. If the tending energies of \[_{1}^{2}H,\text{ }_{1}^{3}H\text{  and  }_{2}^{4}He\] are respectively \[a,\text{ b  and }c\] (in MeV), then the energy (in MeV) released in this reaction is               
  A)
  \[c+a-b\] done clear
  B)
  \[c-a-b\] done clear
  C)
  \[a+b+c\] done clear
  D)
  \[a+b-c\] done clear
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• question_answer12)
  Some radioactive nucleus may emit         
  A)
  Only one \[-13.6\ eV\] or \[\gamma \]at a time done clear
  B)
  All the three \[_{92}{{U}^{238}}\] and \[\gamma \] one after another done clear
  C)
  All the three \[\alpha ,\ \beta \] and \[\gamma \] simultaneously done clear
  D)
  Only\[\alpha \] and \[\beta \] simultaneously done clear
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• question_answer13)
  Which of the following is in the increasing order for penetrating power                                    
  A)
  \[\alpha ,\ \beta ,\ \gamma \] done clear
  B)
  \[\beta ,\ \alpha ,\ \gamma \] done clear
  C)
  \[\gamma ,\ \alpha ,\ \beta \] done clear
  D)
  \[\gamma ,\ \beta ,\ \alpha \] done clear
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• question_answer14)
  A sample contains 16 gm of a radioactive material, the half-life of which is two days. After 32 days, the amount of radioactive material left in the sample is
  A)
  Less than 1 mg done clear
  B)
  \[\frac{1}{4}gm\] done clear
  C)
  \[\frac{1}{2}gm\] done clear
  D)
  1 gm done clear
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• question_answer15)
              Unit of radioactivity is Rutherford. Its value is
  A)
  \[3.7\times {{10}^{10}}\]disi tegrations/sec done clear
  B)
  \[3.7\times {{10}^{6}}\]disintegrations/sec done clear
  C)
  \[1.0\times {{10}^{10}}\] disintegrations/sec done clear
  D)
  \[1.0\times {{10}^{6}}\] disintegrations/sec done clear
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• question_answer16)
  Decay constant of radium is\[\lambda \]. By a suitable process its compound radium bromide is obtained. The decay constant of radium bromide will be
  A)
  \[\lambda \] done clear
  B)
  More than \[\lambda \] done clear
  C)
  Less than \[\lambda \] done clear
  D)
  Zero done clear
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• question_answer17)
  In the given nuclear reaction A, B, C, D, E represents \[_{92}{{U}^{238}}{{\xrightarrow{\alpha }}_{B}}T{{h}^{A}}{{\xrightarrow{\beta }}_{D}}P{{a}^{C}}{{\xrightarrow{E}}_{92}}{{U}^{234}}\]
  A)
  A = 234, B = 90, C = 234, D = 91, E = \[\beta \] done clear
  B)
  A = 234, B = 90, C = 238, D = 94, E = \[\alpha \] done clear
  C)
  A = 238, B = 93, C = 234, D = 91, E = \[\beta \] done clear
  D)
  A = 234, B = 90, C = 234, D = 93, E = \[\alpha \] done clear
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• question_answer18)
  The activity of a radioactive sample         
  A)
  Can be increased by heating it done clear
  B)
  Is independent of physical parameter done clear
  C)
  Cannot be increased by any method done clear
  D)
  Both [b] and [c] done clear
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• question_answer19)
  99% of a radioactive element will decay between
  A)
  6 and 7 half lives done clear
  B)
  7 and 8 half lives done clear
  C)
  8 and 9 half lives done clear
  D)
  9 half lives done clear
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• question_answer20)
  Nucleus produced due to a-decay of the nucleus \[_{Z}{{X}^{A}}\] is
  A)
  \[_{Z+2}{{Y}^{A+4}}\] done clear
  B)
  \[_{Z}{{Y}^{A}}\] done clear
  C)
  \[_{Z-2}{{Y}^{A-4}}\] done clear
  D)
  \[_{Z-4}{{Y}^{A-2}}\] done clear
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• question_answer21)
  The half-life of a sample of a radioactive substance is 1 hour. If \[8\times {{10}^{10}}\] atoms are present at \[t=0\], then the number of atoms decayed in the duration \[t=2\] hour to \[t=4\] hour will be 
  A)
  \[2\times {{10}^{10}}\] done clear
  B)
  \[1.5\times {{10}^{10}}\] done clear
  C)
  Zero      done clear
  D)
  Infinity done clear
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• question_answer22)
  A nucleus decays by \[{{\beta }^{+}}\] emission followed by a gamma emission. If the atomic and mass numbers of the parent nucleus are Z and A respectively, the corresponding numbers for the daughter nucleus are respectively.
  A)
  \[Z-1\] and \[A-1\] done clear
  B)
  \[Z+1\] and \[A\] done clear
  C)
  \[Z-1\] and \[A\] done clear
  D)
  \[Z+1\] and done clear
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• question_answer23)
  Consider two nuclei of the same radioactive nuclide.  One of the nuclei was created in a supernova explosion 5 billion years ago. The other was created in a nuclear reactor 5 minutes ago. The probability of decay during the next time is
  A)
  Different for each nuclei done clear
  B)
  Nuclei created in explosion decays first done clear
  C)
  Nuclei created in the reactor decays first done clear
  D)
  Independent of the time of creation done clear
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• question_answer24)
  Size of nucleus is of the order of
  A)
  \[{{10}^{-10}}m\] done clear
  B)
  \[{{10}^{-15}}m\] done clear
  C)
  \[{{10}^{-12}}m\] done clear
  D)
  \[{{10}^{-19}}m\] done clear
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• question_answer25)
  One requires energy \[{{E}_{n}}\]to remove a nucleon from a nucleus and an energy \['{{E}_{e}}'\]to remove an electron from the orbit of an atom. Then          
  A)
  \[{{E}_{n}}={{E}_{e}}\] done clear
  B)
  \[{{E}_{n}}<{{E}_{e}}\] done clear
  C)
   \[{{E}_{n}}>{{E}_{e}}\] done clear
  D)
  \[{{E}_{n}}\ge {{E}_{e}}\] done clear
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• question_answer26)
  Nucleus of an atom whose atomic mass is 24 consists of
  A)
  11 electrons, 11 protons and 13 neutrons done clear
  B)
  11 electrons, 13 protons and 11 neutrons done clear
  C)
  11 protons and 13 neutrons done clear
  D)
  11 protons and 13 electrons done clear
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• question_answer27)
  In a fission reaction \[_{92}^{236}U{{\to }^{117}}X{{+}^{117}}Y+n+n\], the binding energy per nucleon of X and Y is 8.5 MeV whereas of \[^{236}U\]is 7.6 MeV. The total energy liberated will be about  
  A)
  200 KeV done clear
  B)
  2 MeV done clear
  C)
  200 MeV done clear
  D)
  2000 MeV done clear
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• question_answer28)
  Which of the following isotopes is normally fissionable?
  A)
  \[_{92}{{U}^{238}}\] done clear
  B)
  \[_{93}N{{p}^{239}}\] done clear
  C)
  \[\frac{9}{5}\] done clear
  D)
  \[\frac{{{n}^{2}}}{Z}\] done clear
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• question_answer29)
  During the nuclear fusion reaction            
  A)
  A heavy nucleus breaks into two fragments by itself done clear
  B)
  A light nucleus bombarded by thermal neutrons breaks up done clear
  C)
  A heavy nucleus bombarded by thermal neutrons breaks up done clear
  D)
  Two light nuclei combine to give a heavier nucleus and possibly other products done clear
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• question_answer30)
  g-rays radiation can be used to create electron-positron pair. In this process of pair production, g-rays energy cannot be less than                       
  A)
  5.0 MeV done clear
  B)
  4.02 MeV done clear
  C)
  15.0 MeV done clear
  D)
  1.02 MeV done clear
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• question_answer31)
  \[_{1}{{H}^{1}}{{+}_{1}}{{H}^{1}}{{+}_{1}}{{H}^{2}}\to X+{{\ }_{+1}}{{e}^{0}}+\]energy. The emitted particle is                 
  A)
  Neutron done clear
  B)
  Proton done clear
  C)
  \[\alpha -\]particle done clear
  D)
  Neutrino done clear
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• question_answer32)
  In an atomic bomb, the energy is released due to
  A)
  Chain reaction of neutrons and \[_{92}{{U}^{235}}\] done clear
  B)
  Chain reaction of neutrons and \[_{92}{{U}^{238}}\] done clear
  C)
  Chain reaction of neutrons and \[_{92}{{P}^{240}}\] done clear
  D)
  Chain reaction of neutrons and \[_{92}{{U}^{236}}\] done clear
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• question_answer33)
  The principle of controlled chain reaction is used in
  A)
  Atomic energy reactor      done clear
  B)
  Atom bomb done clear
  C)
  The core of sun   done clear
  D)
  Artificial radioactivity done clear
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• question_answer34)
  The example of nuclear fusion is  
  A)
  Formation of Ba and Kr from U235 done clear
  B)
  Formation of He from H done clear
  C)
  Formation of Pu – 235 from U – 235 done clear
  D)
  Formation of water from hydrogen and oxygen done clear
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• question_answer35)
  Beta rays emitted by a radioactive material are
  A)
  Electromagnetic radiation done clear
  B)
  The electrons orbiting around the nucleus done clear
  C)
  Charged particles emitted by nucleus done clear
  D)
  Neutral particles done clear
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• question_answer36)
  The average life T and the decay constant \[\lambda \] of a radioactive nucleus are related as 
  A)
  \[T\lambda =1\] done clear
  B)
  \[T=\frac{0.693}{\lambda }\] done clear
  C)
  \[\frac{T}{\lambda }=1\] done clear
  D)
  \[{{\lambda }_{1}},\ {{\lambda }_{2}},\ {{\lambda }_{3}}\] done clear
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• question_answer37)
  An archaeologist analyses the wood in a prehistoric structure and finds that \[{{C}^{14}}\](Half life = 5700 years) to \[{{C}^{12}}\]is only one- fourth of that found in the cells buried plants. The age of the wood is about
  A)
  5700 years done clear
  B)
  2850 years done clear
  C)
  11,400 years done clear
  D)
  22,800 years done clear
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• question_answer38)
  A radioactive nucleus \[_{92}{{X}^{235}}\]decays to \[_{91}{{Y}^{231}}\]. Which of the following particles are emitted
  A)
  One alpha and one electron          done clear
  B)
  Two deuterons and one positron done clear
  C)
  One alpha and one proton done clear
  D)
  One proton and four neutrons done clear
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• question_answer39)
  The half life of \[^{131}I\] is 8 days. Given a sample of \[^{131}I\] at time t = 0, we can assert that  
  A)
  No nucleus will decay before t = 4 days done clear
  B)
  No nucleus will decay before t = 8 days done clear
  C)
  All nuclei will decay before t = 16 days done clear
  D)
  A given nucleus may decay at any time after t = 0 done clear
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• question_answer40)

  Consider the following two statements

  A. Energy spectrum of \[\alpha \]-particles emitted in radioactive decay is discrete

  B. Energy spectrum of \[\beta \]-particles emitted in radioactive decay is continuous

  A)
  Only A is correct done clear
  B)
  Only B is correct done clear
  C)
  A is correct but B is wrong done clear
  D)
  Both A and B are correct done clear
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