JEE Main & Advanced Physics Nuclear Physics And Radioactivity Question Bank

done Nucleus, Nuclear Reaction Total Questions - 179

• question_answer1)
  Which of the following particles are constituents of the nucleus                [CBSE PMT 1992; RPET/PMT 1999]
  A)
             Protons and electrons      done clear
  B)
             Protons and neutrons done clear
  C)
             Neutrons and electrons   done clear
  D)
             Neutrons and positrons done clear
  View Solution play_arrow

• question_answer2)
  The particles which can be added to the nucleus of an atom without changing its chemical properties are called [NCERT 1979]
  A)
             Electrons                                done clear
  B)
             Protons done clear
  C)
             Neutrons                                done clear
  D)
             None of the above done clear
  View Solution play_arrow

• question_answer3)
  The neutron was discovered by  [MP PMT 1992; RPMT 1996]
  A)
             Marie Curie                           done clear
  B)
             Pierre Curie done clear
  C)
             James Chadwick                  done clear
  D)
             Rutherford done clear
  View Solution play_arrow

• question_answer4)
  The mass number of a nucleus is [IIT 1986; ISM Dhanbad 1994;  MP PMT 1997; CBSE PMT 2003; MH CET (Med.) 2001]
  A)
             Always less than its atomic number done clear
  B)
             Always more than its atomic number done clear
  C)
             Always equal to its atomic number done clear
  D)
             Sometimes more than and sometimes equal to its atomic number done clear
  View Solution play_arrow

• question_answer5)
  The energy equivalent of 1 kilogram of matter is about   [MP PET/PMT 1988; MNR 1987]
  A)
             \[{{10}^{-15}}\]J                  done clear
  B)
             1 J done clear
  C)
             \[{{10}^{-12}}\]J                  done clear
  D)
             \[{{P}_{0}}\]J done clear
  View Solution play_arrow

• question_answer6)
  Nuclear binding energy is equivalent to   [MP PET/PMT 1988]
  A)
             Mass of proton                    done clear
  B)
             Mass of neutron                 done clear
  C)
             Mass of nucleus                  done clear
  D)
             Mass defect of nucleus done clear
  View Solution play_arrow

• question_answer7)
  If the binding energy of the deutrium is 2.23 MeV. The mass defect given in a.m.u. is                      [MP PET 1993]
  A)
             ? 0.0024                                  done clear
  B)
             ? 0.0012 done clear
  C)
             0.0012                                      done clear
  D)
             0.0024 done clear
  View Solution play_arrow

• question_answer8)
  Which of the following has the mass closest in value to that of the positron                         [AFMC 1993]          
  A)
             Proton                                     done clear
  B)
             Electron done clear
  C)
             Photon                                    done clear
  D)
             Neutrino \[(1\ a.m.u=931\ MeV)\] done clear
  View Solution play_arrow

• question_answer9)
  Size of nucleus is of the order of [CPMT 1983; MP PET 2002, 03]
  A)
             \[{{10}^{-10}}m\]                done clear
  B)
             \[{{10}^{-15}}m\] done clear
  C)
             \[{{10}^{-12}}m\] done clear
  D)
             \[{{10}^{-19}}m\] done clear
  View Solution play_arrow

• question_answer10)
  For effective nuclear forces, the distance should be [Orissa PMT 2004]
  A)
             \[{{10}^{-10}}m\]                done clear
  B)
             \[{{10}^{-13}}m\] done clear
  C)
             \[{{10}^{-15}}m\]                done clear
  D)
             \[{{10}^{-20}}m\] done clear
  View Solution play_arrow

• question_answer11)
  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) [CPMT 1986; MP PMT 1995; CBSE PMT 2003]
  A)
             28.4 MeV                                done clear
  B)
             20.8 MeV done clear
  C)
             27.3 MeV                                done clear
  D)
             14.2 MeV done clear
  View Solution play_arrow

• question_answer12)
  The mass defect for the nucleus of helium is 0.0303 a.m.u. What is the binding energy per nucleon for helium in MeV  [NCERT 1990]
  A)
             28   done clear
  B)
             7 done clear
  C)
             4     done clear
  D)
             1 done clear
  View Solution play_arrow

• question_answer13)
  Atomic power station at Tarapore has a generating capacity of 200 MW. The energy generated in a day by this station is [NCERT 1975]
  A)
             200 MW                                  done clear
  B)
             200 J done clear
  C)
             \[4800\times {{10}^{6}}\]J      done clear
  D)
             \[1728\times {{10}^{10}}\]J done clear
  View Solution play_arrow

• question_answer14)
  One microgram of matter converted into energy will give              [CPMT 1984; EAMCET (Engg.) 1995; SCRA 1994; BVP 2003]
  A)
             90 J                                            done clear
  B)
             \[9\times {{10}^{3}}\]J done clear
  C)
             \[9\times {{10}^{10}}\]J done clear
  D)
             \[9\times {{10}^{5}}\]J done clear
  View Solution play_arrow

• question_answer15)
  The average binding energy per nucleon in the nucleus of an atom is approximately                                        [EAMCET 1988; CBSE PMT 1992; CPMT 1999; RPET 2002]
  A)
             8 eV                                          done clear
  B)
             8 KeV done clear
  C)
             8 MeV                                      done clear
  D)
             8 J done clear
  View Solution play_arrow

• question_answer16)
  The binding energy of deuteron \[_{1}^{2}H\]is 1.112 MeV per nucleon and an \[\alpha -\]particle \[_{2}^{4}He\]has a binding energy of 7.047 MeV per nucleon. Then in the fusion reaction\[_{1}^{2}H+_{1}^{2}H\to _{2}^{4}He+Q\], the energy Q released is [MP PMT 1992; Roorkee 1994; IIT 1996; AIIMS 1997]
  A)
             1 MeV                                      done clear
  B)
             11.9 MeV done clear
  C)
             23.8 MeV                                done clear
  D)
             931 MeV done clear
  View Solution play_arrow

• question_answer17)
  Binding energy of a nucleus is
  A)
             Energy given to its nucleus during its formation done clear
  B)
             Total mass of nucleus converted to energy units done clear
  C)
             Loss of energy from the nucleus during its formation done clear
  D)
             Total K.E. and P.E. of the nucleons in the nucleus done clear
  View Solution play_arrow

• question_answer18)
  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                                                                [NCERT 1981]
  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
  View Solution play_arrow

• question_answer19)
  Which of the following pairs is an isobar           [MP PET 1994]
  A)
             \[_{1}{{H}^{1}}\]and \[_{1}{{H}^{2}}\]                           done clear
  B)
             \[_{1}{{H}^{2}}\]and \[_{1}{{H}^{3}}\] done clear
  C)
             \[_{6}{{C}^{12}}\]and \[_{6}{{C}^{13}}\]                       done clear
  D)
             \[_{15}{{P}^{30}}\]and \[_{14}S{{i}^{30}}\] done clear
  View Solution play_arrow

• question_answer20)
  Equivalent energy of mass equal to 1 a.m.u. is [CBSE PMT 1992; MP PET 1988, 2002; MP PMT 1994, 98, 2004; RPET 1997; RPMT 2000]
  A)
             931 KeV                                   done clear
  B)
             931 eV done clear
  C)
             931 MeV                                 done clear
  D)
             9.31 MeV done clear
  View Solution play_arrow

• question_answer21)
  The binding energies per nucleon for a deuteron and an \[\alpha -\]particle are x1 and x2 respectively. What will be the energy Q released in the reaction \[_{1}{{H}^{2}}{{+}_{1}}{{H}^{2}}{{\to }_{2}}H{{e}^{4}}+Q\]     [CBSE PMT 1995]
  A)
             \[4({{x}_{1}}+{{x}_{2}})\] done clear
  B)
             \[4({{x}_{2}}-{{x}_{1}})\] done clear
  C)
             \[2({{x}_{1}}+{{x}_{2}})\] done clear
  D)
             \[2({{x}_{2}}-{{x}_{1}})\] done clear
  View Solution play_arrow

• question_answer22)
  The mass number of a nucleus is equal to the number of [MP PET 1996]
  A)
             Electrons it contains           done clear
  B)
             Protons it contains done clear
  C)
             Neutrons it contains          done clear
  D)
             Nucleons it contains done clear
  View Solution play_arrow

• question_answer23)
  The rest energy of an electron is [MP PMT 1996; BCECE 2003]
  A)
             510 KeV                                   done clear
  B)
             931 KeV done clear
  C)
             510 MeV                                 done clear
  D)
             931 MeV done clear
  View Solution play_arrow

• question_answer24)
  In \[_{88}R{{a}^{226}}\]nucleus, there are                                                           [MP PMT/PET 1998]
  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
  View Solution play_arrow

• question_answer25)
  Outside a nucleus                 [MP PET 1999; CPMT 2000; BHU 2000]
  A)
             Neutron is stable                done clear
  B)
             Proton and neutron both are stable done clear
  C)
             Neutron is unstable done clear
  D)
             Neither neutron nor proton is stable done clear
  View Solution play_arrow

• question_answer26)
  Order of magnitude of density of uranium nucleus is \[({{m}_{p}}=1.67\times {{10}^{-27}}kg)\] [MP PET 1995; IIT-JEE 1999; MP PMT 2000; UPSEAT 2003]
  A)
             \[{{10}^{20}}kg/{{m}^{3}}\]    done clear
  B)
             \[{{10}^{17}}kg/{{m}^{3}}\] done clear
  C)
             \[{{10}^{14}}kg/{{m}^{3}}\]    done clear
  D)
             \[{{10}^{11}}kg/{{m}^{3}}\] done clear
  View Solution play_arrow

• question_answer27)
  Radius of \[_{2}^{4}He\]nucleus is 3 Fermi. The radius of \[3\to 2\]nucleus will be                                             [CPMT 1999]
  A)
             5 Fermi                                    done clear
  B)
             6 Fermi done clear
  C)
             11.16 Fermi                            done clear
  D)
             8 Fermi done clear
  View Solution play_arrow

• question_answer28)
  Nucleus of an atom whose atomic mass is 24 consists of [CPMT 1999]
  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
  View Solution play_arrow

• question_answer29)
  Atomic weight of boron is 10.81 and it has two isotopes \[_{5}{{B}^{10}}\]and \[_{5}{{B}^{11}}\]. Then ratio of \[_{5}{{B}^{10}}{{:}_{5}}{{B}^{11}}\]in nature would be                  [CBSE PMT 1998; JIPMER 2001, 02]
  A)
             19 : 81                                      done clear
  B)
             10 : 11 done clear
  C)
             15 : 16                                      done clear
  D)
             81 : 19 done clear
  View Solution play_arrow

• question_answer30)
  The mass of a neutron is the same as that of      [KCET 1994]
  A)
             A proton                                 done clear
  B)
             A meson done clear
  C)
             An epsilon                              done clear
  D)
             An electron done clear
  View Solution play_arrow

• question_answer31)
  The mass defect per nucleon is called [EAMCET 1994; MP PMT 2002; MP PMT 2002]
  A)
             Binding energy                     done clear
  B)
             Packing fraction done clear
  C)
             Ionization energy                done clear
  D)
             Excitation energy done clear
  View Solution play_arrow

• question_answer32)
  Nuclear forces are [EAMCET (Engg.) 1995; CPMT 1999; AMU 2001]
  A)
             Short ranged attractive and charge independent done clear
  B)
             Short ranged attractive and charge dependent done clear
  C)
             Long ranged repulsive and charge independent done clear
  D)
             Long ranged repulsive and charge dependent done clear
  View Solution play_arrow

• question_answer33)
  \[\pi \]mesons can be                                                   [RPET 1997]
  A)
             \[{{\pi }^{+}}\]or \[{{\pi }^{-}}\]                                        done clear
  B)
             \[{{\pi }^{+}}\]or \[{{\pi }^{0}}\] done clear
  C)
             \[{{\pi }^{-}}\]or \[{{\pi }^{0}}\]                                        done clear
  D)
             \[{{\pi }^{+}},\ {{\pi }^{-}}\]or \[{{\pi }^{0}}\] done clear
  View Solution play_arrow

• question_answer34)
  In helium nucleus, there are                                      [RPET 1997]
  A)
             2 protons and 2 electrons done clear
  B)
             2 neutrons, 2 protons and 2 electrons done clear
  C)
             2 protons and 2 neutrons done clear
  D)
             2 positrons and 2 protons done clear
  View Solution play_arrow

• question_answer35)
   Antiparticle of electron is                                          [RPMT 1997]
  A)
             \[_{0}{{n}^{1}}\]                  done clear
  B)
             \[_{1}{{H}^{1}}\] done clear
  C)
             Positron                                  done clear
  D)
             Neutrino done clear
  View Solution play_arrow

• question_answer36)
  The binding energy per nucleon is maximum in the case of   [CBSE PMT 1993; JIPMER 2001, 02]
  A)
             \[_{4}^{2}He\]                     done clear
  B)
             \[_{26}^{56}Fe\] done clear
  C)
             \[_{56}^{141}Ba\]               done clear
  D)
             \[_{92}^{235}U\] done clear
  View Solution play_arrow

• question_answer37)
  Isotopes are atoms having                 [KCET 1994; BHU 2001]
  A)
             Same number of protons but different number of neutrons            done clear
  B)
             Same number of neutrons but different number of protons  done clear
  C)
             Same number of protons and neutrons                       done clear
  D)
             None of the above done clear
  View Solution play_arrow

• question_answer38)
  The mass of an a-particle is                                [CBSE PMT 1992]
  A)
             Less than the sum of masses of two protons and two neutrons      done clear
  B)
             Equal to mass of four protons done clear
  C)
             Equal to mass of four neutrons                                       . done clear
  D)
             Equal to sum of masses of two protons and two neutrons done clear
  View Solution play_arrow

• question_answer39)
  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 [CBSE PMT 1994; JIPMER 2000]
  A)
             19.6 MeV                                done clear
  B)
             2.4 MeV done clear
  C)
             8.4 MeV                                  done clear
  D)
             17.3 MeV done clear
  View Solution play_arrow

• question_answer40)
  The mass number of He is 4 and that for sulphur is 32. The radius of sulphur nucleus is larger than that of helium, by times                                                                      [CBSE PMT 1994]
  A)
             \[\sqrt{8}\]                            done clear
  B)
             4 done clear
  C)
             2     done clear
  D)
             8 done clear
  View Solution play_arrow

• question_answer41)
  A nucleus ruptures into two nuclear parts which have their velocity ratio equal to 2 : 1. What will be the ratio of their nuclear size (nuclear radius)                               [CBSE PMT 1996]
  A)
             \[{{2}^{1/3}}:1\]                  done clear
  B)
             \[1:{{2}^{1/3}}\] done clear
  C)
             \[{{3}^{1/2}}:1\]                  done clear
  D)
             \[1:{{3}^{1/2}}\] done clear
  View Solution play_arrow

• question_answer42)
  Energy of 1g uranium is equal to                            [CPMT 1996]
  A)
             \[9.0\times {{10}^{13}}J\]       done clear
  B)
             \[9.0\times {{10}^{19}}J\] done clear
  C)
             \[3.0\times {{10}^{16}}J\]       done clear
  D)
             \[3.0\times {{10}^{17}}J\] done clear
  View Solution play_arrow

• question_answer43)
  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          [CBSE PMT 1997]
  A)
             200 KeV                                   done clear
  B)
             2 MeV done clear
  C)
             200 MeV                                 done clear
  D)
             2000 MeV done clear
  View Solution play_arrow

• question_answer44)
  Atomic number of a nucleus is Z and atomic mass is M. The number of neutron is [CPMT 1997; RPMT 1999; BHU 1999]
  A)
             \[M-Z\]                                   done clear
  B)
             M done clear
  C)
             Z     done clear
  D)
             \[M+Z\] done clear
  View Solution play_arrow

• question_answer45)
  The a-particle is the nucleus of an atom of [MP PET 2003]
  A)
             Neon                                        done clear
  B)
             Hydrogen done clear
  C)
             Helium done clear
  D)
             Deuterium done clear
  View Solution play_arrow

• question_answer46)
  The force acting between proton and proton inside the nucleus is                                            [RPET 1999]
  A)
             Coulombic                              done clear
  B)
             Nuclear done clear
  C)
             Both                                         done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer47)
  For a nucleus to be stable, the correct relation between neutron number N and Proton number Z is [RPET 1999]
  A)
             \[N>Z\]                                   done clear
  B)
             \[N=Z\] done clear
  C)
             \[N<Z\]                                   done clear
  D)
             \[N\ge Z\] done clear
  View Solution play_arrow

• question_answer48)
  Two nucleons are at a separation of \[1\times {{10}^{-15}}m\]. The net force between them is \[{{F}_{1}}\], if both are neutrons, \[{{F}_{2}}\] if both are protons and \[{{F}_{3}}\] if one is a proton and other is a neutron. In such a case           [KCET (Med.) 2000, 05; UPSEAT 2005]
  A)
             \[{{F}_{2}}>{{F}_{1}}>{{F}_{3}}\]                                      done clear
  B)
             \[{{F}_{1}}={{F}_{2}}={{F}_{3}}\] done clear
  C)
             \[{{F}_{1}}={{F}_{2}}>{{F}_{3}}\]                                      done clear
  D)
             \[{{F}_{1}}={{F}_{3}}>{{F}_{2}}\] done clear
  View Solution play_arrow

• question_answer49)
  \[{{M}_{n}}\] 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      [CBSE PMT 2001]
  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
  View Solution play_arrow

• question_answer50)
  If a \[{{H}_{2}}\] nucleus is completely converted into energy, the energy produced will be around           [Kerala (Engg.) 2001]
  A)
             1 MeV                                      done clear
  B)
             938 MeV done clear
  C)
             9.38 MeV done clear
  D)
             238 MeV done clear
  View Solution play_arrow

• question_answer51)
  The radius of a nucleus of a mass number A is directly proportional to  [MH CET 1999; AMU (Engg.) 2001; UPSEAT 2004]
  A)
             \[{{A}^{3}}\]                          done clear
  B)
             A done clear
  C)
             \[{{A}^{2/3}}\]                     done clear
  D)
             \[{{A}^{1/3}}\] done clear
  View Solution play_arrow

• question_answer52)
  The mass and energy equivalent to 1 a.m.u. respectively                              [CPMT 2000; MP PET/PMT 2001]
  A)
             \[1.67\times {{10}^{-27}}\,gm,\,\,9.30\,\,MeV\] done clear
  B)
             \[1.67\times {{10}^{-27}}\,kg,\,\,930\,\,MeV\] done clear
  C)
             \[1.67\times {{10}^{-27}}kg,\,\,1\,\,MeV\] done clear
  D)
             \[1.67\times {{10}^{-34}}\,kg,\,\,1\,\,MeV\] done clear
  View Solution play_arrow

• question_answer53)
  The sodium nucleus \[_{11}^{23}Na\] contains [MP PET 2001]
  A)
             11 electrons                          done clear
  B)
             12 protons done clear
  C)
             23 protons                             done clear
  D)
             12 neutrons done clear
  View Solution play_arrow

• question_answer54)
  As compared 12C atom, 14C atom has  [MP PMT 2002]
  A)
             Two extra protons and two extra electrons done clear
  B)
             Two extra protons but no extra electrons done clear
  C)
             Two extra neutrons and no extra electrons done clear
  D)
             Two extra neutrons and two extra electrons done clear
  View Solution play_arrow

• question_answer55)
  Two protons exerts a nuclear force on each other, the distance between them is                                             [CPMT 2002]
  A)
             \[{{10}^{-14}}m\]                done clear
  B)
             \[{{10}^{-10}}m\] done clear
  C)
             \[{{10}^{-12}}m\]                done clear
  D)
             \[{{10}^{-8}}m\] done clear
  View Solution play_arrow

• question_answer56)
  If m, mn and mp are the masses of \[_{Z}{{X}^{A}}\]nucleus, neutron and proton respectively                      [KCET 2003; CPMT 2003]
  A)
             \[m<{{(A-Z)}_{{{m}_{n}}}}+Z{{m}_{p}}\]                      done clear
  B)
             \[m=(A-Z){{m}_{n}}+Z{{m}_{p}}\] done clear
  C)
             \[m=(A-Z){{m}_{p}}+Z{{m}_{n}}\]                                   done clear
  D)
             \[m>(A-Z){{m}_{n}}+Z{{m}_{p}}\] done clear
  View Solution play_arrow

• question_answer57)
  The mass defect in a particular nuclear reaction is 0.3 grams. The amount of energy liberated in kilowatt hours is (Velocity of light = \[3\times {{10}^{8}}\,m/s\])                                                       [EAMCET 2003]
  A)
             \[1.5\times {{10}^{6}}\]    done clear
  B)
             \[2.5\times {{10}^{6}}\] done clear
  C)
             \[3\times {{10}^{6}}\]       done clear
  D)
             \[7.5\times {{10}^{6}}\] done clear
  View Solution play_arrow

• question_answer58)
  Which of the following statement(s) is/(are) correct [IIT 1994]
  A)
             The rest mass of a stable nucleus is less than the sum of the rest masses of its separated nucleons done clear
  B)
             The rest mass of a stable nucleus is greater than the sum of the rest masses of its separated nucleons. done clear
  C)
             In nuclear fusion, energy is released by fusing two nuclei of medium mass (approximately 100 a.m.u.) done clear
  D)
             In nuclear fission, energy is released by fragmentation of a very heavy nucleus done clear
  View Solution play_arrow

• question_answer59)
  On the bombardment of neutron with Boron. a-particle is emitted and product nuclei formed is [RPMT 2000]        
  A)
             \[_{6}{{C}^{12}}\]               done clear
  B)
             \[_{3}L{{i}^{6}}\] done clear
  C)
             \[_{3}L{{i}^{7}}\]                 done clear
  D)
             \[_{4}B{{e}^{9}}\] done clear
  View Solution play_arrow

• question_answer60)
  The average kinetic energy of the thermal neutrons is of the order of                    [MP PET 1993; AMU (Engg.) 1999]
  A)
             \[0.03\ eV\]                           done clear
  B)
             \[3\ eV\] done clear
  C)
             \[3\ KeV\] done clear
  D)
             \[3\ MeV\] (Boltzmann's constant \[{{K}_{B}}=8\times {{10}^{-5}}eV/Kelvin\]) done clear
  View Solution play_arrow

• question_answer61)
  Which of the following isotopes is normally fissionable? [MP PET 1993]
  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
  View Solution play_arrow

• question_answer62)
  The control rod in a nuclear reactor is made of [EAMCET (Med.) 1995]
  A)
             Uranium                                 done clear
  B)
             Cadmium done clear
  C)
             Graphite                                 done clear
  D)
             Plutonium done clear
  View Solution play_arrow

• question_answer63)
  The process by which a heavy nucleus splits into light nuclei is known as                                                [MP PET 1996]            
  A)
             Fission                                     done clear
  B)
             \[\alpha -\]decay done clear
  C)
             Fusion                                      done clear
  D)
             Chain reaction done clear
  View Solution play_arrow

• question_answer64)
  The explosion of the atomic bomb takes place due to [CPMT 1984, 86; BHU 2001]
  A)
             Nuclear fission                     done clear
  B)
             Nuclear fusion done clear
  C)
             Scattering                               done clear
  D)
             Thermionic emission done clear
  View Solution play_arrow

• question_answer65)
  In nuclear reaction \[_{2}H{{e}^{4}}{{+}_{z}}{{X}^{A}}{{\to }_{z+2}}{{Y}^{A+3}}+A,\ A\]  denotes                                                  [CPMT 1997]
  A)
             Electron                                  done clear
  B)
             Positron done clear
  C)
             Proton                                     done clear
  D)
             Neutron done clear
  View Solution play_arrow

• question_answer66)
  Energy generation in stars is mainly due to [DCE 1999, 2000]
  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
  View Solution play_arrow

• question_answer67)
  Which of the following is the fusion reaction [MP PET 1993]
  A)
    \[_{1}{{H}^{2}}{{+}_{1}}{{H}^{2}}{{\to }_{2}}H{{e}^{4}}\] done clear
  B)
             \[_{0}{{n}^{1}}{{+}_{7}}{{N}^{14}}{{\to }_{6}}{{C}^{14}}{{+}_{1}}{{H}^{1}}\] done clear
  C)
             \[_{0}{{n}^{1}}{{+}_{92}}{{U}^{238}}{{\to }_{93}}N{{p}^{239}}+{{\beta }^{-1}}+\gamma \] done clear
  D)
             \[_{1}{{H}^{3}}{{\to }_{2}}H{{e}^{3}}+{{\beta }^{-1}}+\gamma \] done clear
  View Solution play_arrow

• question_answer68)
  If the speed of light were 2/3 of its present value, the energy released in a given atomic explosion will be decreased by a fraction                                                      [Kerala PET 2002]
  A)
             2/3 done clear
  B)
             4/9 done clear
  C)
             3/4                                            done clear
  D)
             5/9 done clear
  View Solution play_arrow

• question_answer69)
  Fusion reaction is initiated with the help of       [DPMT 2002]
  A)
             Low temperature               done clear
  B)
             High temperature               done clear
  C)
             Neutrons                                done clear
  D)
             Any particle done clear
  View Solution play_arrow

• question_answer70)
  When a \[_{4}B{{e}^{9}}\] atom is bombarded with \[\alpha -\] particles, one of the product of nuclear transmutation is\[_{6}{{C}^{12}}\]. The other is                                                                               [CPMT 1982]
  A)
             \[_{-1}{{e}^{0}}\]                done clear
  B)
             \[X-\] done clear
  C)
             \[_{1}{{D}^{2}}\]                 done clear
  D)
             \[_{0}{{n}^{1}}\] done clear
  View Solution play_arrow

• question_answer71)
  Atom bomb consists of two pieces of \[_{92}{{U}^{235}}\] and a source of                                                           [MP PET/PMT 1988]
  A)
             Proton                                     done clear
  B)
             Neutron done clear
  C)
             Meson                                     done clear
  D)
             Electron done clear
  View Solution play_arrow

• question_answer72)
  Most suitable element for nuclear fission is the element with atomic number near                                          [CPMT 1982]
  A)
             11   done clear
  B)
             21 done clear
  C)
             52   done clear
  D)
             92 done clear
  View Solution play_arrow

• question_answer73)
  From the following equations, pick out the possible nuclear reactions                                     [IIT 1984]
  A)
             \[_{6}{{C}^{13}}{{+}_{1}}{{H}^{1}}{{\to }_{6}}{{C}^{14}}+4.3\ MeV\] done clear
  B)
             \[_{6}{{C}^{12}}{{+}_{1}}{{H}^{1}}{{\to }_{7}}{{N}^{13}}+2\ MeV\] done clear
  C)
             \[_{7}{{N}^{14}}{{+}_{1}}{{H}^{1}}{{\to }_{8}}{{O}^{15}}+7.3\ MeV\] done clear
  D)
             \[_{92}{{U}^{235}}{{+}_{0}}{{n}^{1}}{{\to }_{54}}{{X}^{140}}{{+}_{38}}S{{i}^{94}}+{{2}_{0}}{{n}^{1}}+\gamma +200MeV\] done clear
  View Solution play_arrow

• question_answer74)
  During the nuclear fusion reaction                             [IIT 1987]
  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
  View Solution play_arrow

• question_answer75)
  In a working nuclear reactor, Cadmium rods, (control rods) are used to                  [CPMT 2003; MP PMT 2004]
  A)
             Speed up neutrons            done clear
  B)
             Slow down neutrons done clear
  C)
             Absorb some neutrons    done clear
  D)
             Absorb all neutrons done clear
  View Solution play_arrow

• question_answer76)
  Fusion reaction takes place at high temperature because             [CPMT 1980; SCRA 1996; RPET 1999]
  A)
             Atoms are ionised at high temperature                        done clear
  B)
             Molecules break-up at high temperature done clear
  C)
             Nuclei break-up at high temperature done clear
  D)
             Kinetic energy is high enough to overcome repulsion between nuclei done clear
  View Solution play_arrow

• question_answer77)
  In nuclear reactions, we have the conservation of  [CPMT 1990; AIIMS 1997]
  A)
             Mass only                               done clear
  B)
             Energy only done clear
  C)
             Momentum only                 done clear
  D)
             Mass, energy and momentum done clear
  View Solution play_arrow

• question_answer78)
  The mechanism of the hydrogen bomb is based on
  A)
             Fission of isotopes of hydrogen done clear
  B)
             Fusion of protons done clear
  C)
             Fusion of deutrium and tritium done clear
  D)
             Fusion of neutrons done clear
  View Solution play_arrow

• question_answer79)
  The main source of solar energy is[CPMT 1990; MP PET 1985, 86; CBSE PMT 1992; EAMCET (Engg.) 1995; RPET 1996; AFMC 1998]
  A)
             Fission reactions                  done clear
  B)
             Fusion reactions done clear
  C)
             Chemical reactions             done clear
  D)
             Combustion reactions done clear
  View Solution play_arrow

• question_answer80)
  A gamma ray photon creates an electron- positron pair. If the rest mass energy of an electron is 0.5 MeV and the total K.E. of the electron- positron pair is 0.78 MeV, then the energy of the gamma ray photon must be    [MP PMT 1991]
  A)
             0.78 MeV                                done clear
  B)
             1.78 MeV done clear
  C)
             1.28 MeV                                done clear
  D)
             0.28 MeV done clear
  View Solution play_arrow

• question_answer81)
  Which of the following statement is true         [MP PET 1993]
  A)
             \[_{78}P{{t}^{192}}\] has 78 neutrons done clear
  B)
             \[_{84}P{{o}^{214}}{{\to }_{82}}P{{b}^{210}}+{{\beta }^{-}}\] done clear
  C)
             \[_{92}{{U}^{238}}{{\to }_{90}}T{{h}^{234}}{{+}_{2}}H{{e}^{4}}\] done clear
  D)
             \[_{90}T{{h}^{234}}{{\to }_{91}}P{{a}^{234}}{{+}_{2}}H{{e}^{4}}\] done clear
  View Solution play_arrow

• question_answer82)
  What was the fissionable material used in bomb dropped at Nagasaki (Japan) in the year 1945? [MNR 1985; UPSEAT 2003]
  A)
             Uranium                                 done clear
  B)
             Nepturium done clear
  C)
             Berkalium                               done clear
  D)
             Plutonium done clear
  View Solution play_arrow

• question_answer83)
  Thermal neutrons are those which                                                          [NCERT 1983]
  A)
             Are at very high temperature done clear
  B)
             Move with high velocities done clear
  C)
             Have kinetic energies similar to those of surrounding molecules done clear
  D)
             Are at rest done clear
  View Solution play_arrow

• question_answer84)
  In a fission process, nucleus A divides into two nuclei B and C, their binding energies being \[{{E}_{a}},\ {{E}_{b}}\]and \[{{E}_{c}}\] respectively. Then
  A)
             \[{{E}_{b}}={{E}_{c}}=Ea\]       done clear
  B)
             \[{{E}_{b}}+{{E}_{c}}>{{E}_{a}}\] done clear
  C)
             \[{{E}_{b}}+{{E}_{c}}<{{E}_{a}}\]                                      done clear
  D)
             \[{{E}_{b}},\ {{E}_{c}}={{E}_{a}}\] done clear
  View Solution play_arrow

• question_answer85)
  A nuclear bomb exploded 200 km above the surface of moon. The sound of explosion on the moon  [CPMT 1989]
  A)
             Will heard before the explosion is seen done clear
  B)
             Will be heard at the same time done clear
  C)
             Will be heard after explosion done clear
  D)
             Will not heard at all done clear
  View Solution play_arrow

• question_answer86)
  Fast neutrons can easily be slowed down by          [IIT 1994]
  A)
             The use of lead shielding done clear
  B)
             Passing them through water done clear
  C)
             Elastic collisions with heavy nuclei done clear
  D)
             Applying a strong electric field done clear
  View Solution play_arrow

• question_answer87)
  The mass equivalent of 931 MeV energy is [MP PET 1994; MH CET 2003]
  A)
             \[1.66\times {{10}^{-27}}kg\]                                            done clear
  B)
             \[6.02\times {{10}^{-24}}kg\] done clear
  C)
             \[1.66\times {{10}^{-20}}kg\]                                            done clear
  D)
             \[6.02\times {{10}^{-27}}kg\] done clear
  View Solution play_arrow

• question_answer88)
  When \[_{92}{{U}^{235}}\]undergoes fission, 0.1% of its original mass is changed into energy. How much energy is released if 1kg of \[_{92}{{U}^{235}}\]undergoes fission [MP PET 1994; MP PMT/PET 1998; BHU 2001;  BVP 2003]
  A)
             \[9\times {{10}^{10}}J\]   done clear
  B)
             \[9\times {{10}^{11}}J\] done clear
  C)
             \[9\times {{10}^{12}}J\]   done clear
  D)
             \[9\times {{10}^{13}}J\] done clear
  View Solution play_arrow

• question_answer89)
   g-rays radiation can be used to create electron-positron pair. In this process of pair production, g-rays energy cannot be less than                                                    [MP PMT 1994]                            
  A)
             5.0 MeV                                  done clear
  B)
             4.02 MeV done clear
  C)
             15.0 MeV                                done clear
  D)
             1.02 MeV done clear
  View Solution play_arrow

• question_answer90)
  A reaction between a proton and \[_{8}{{O}^{18}}\]that produces \[_{9}{{F}^{18}}\]must also liberate                                      [Roorkee 1995]
  A)
             \[_{0}{{n}^{1}}\]                  done clear
  B)
             \[_{1}{{e}^{0}}\] done clear
  C)
             \[_{1}{{n}^{0}}\]                  done clear
  D)
             \[_{0}{{e}^{1}}\] done clear
  View Solution play_arrow

• question_answer91)
  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         [MP PET 1995]
  A)
             1000                                          done clear
  B)
             \[2\times {{10}^{8}}\] done clear
  C)
             \[3.125\times {{10}^{16}}\]    done clear
  D)
              931 done clear
  View Solution play_arrow

• question_answer92)
  In the nuclear reaction\[_{92}{{U}^{238}}{{\to }_{z}}T{{h}^{A}}{{+}_{2}}H{{e}^{4}}\], the values of A and Z are                                       [MP PMT 1996]
  A)
             A = 234, Z = 94                      done clear
  B)
             A = 234, Z = 90 done clear
  C)
             A = 238, Z = 94                      done clear
  D)
             A = 238, Z = 90 done clear
  View Solution play_arrow

• question_answer93)
  If 200 MeV energy is released in the fission of a single \[{{U}^{235}}\]nucleus, the number of fissions required per second to produce 1 kilowatt power shall be (Given \[1\ eV=1.6\times {{10}^{-19}}J\]) [AMU 1995; MP PMT 1999]
  A)
             \[3.125\times {{10}^{13}}\]    done clear
  B)
             \[3.125\times {{10}^{14}}\] done clear
  C)
             \[3.125\times {{10}^{15}}\]    done clear
  D)
             \[3.125\times {{10}^{16}}\] done clear
  View Solution play_arrow

• question_answer94)
  A chain reaction is continuous due to                   [CPMT 1999]
  A)
             Large mass defect done clear
  B)
             Large energy done clear
  C)
             Production of more neutrons in fission done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer95)
  Complete the equation for the following fission process \[_{92}{{U}^{235}}{{+}_{0}}{{n}^{1}}{{\to }_{38}}S{{r}^{90}}+....\]                                                              [CBSE PMT 1998]
  A)
             \[_{54}X{{e}^{143}}+3{{\ }_{0}}{{n}^{1}}\]                   done clear
  B)
             \[_{54}X{{e}^{145}}\] done clear
  C)
             \[_{57}X{{e}^{142}}\]        done clear
  D)
             \[_{54}X{{e}^{142}}{{+}_{0}}{{n}^{{}}}\] done clear
  View Solution play_arrow

• question_answer96)
  The example of nuclear fusion is                              [KCET 1994]
  A)
             Formation of barium and krypton from uranium done clear
  B)
             Formation of helium from hydrogen done clear
  C)
             Formation of plutonium 235 from uranium 235 done clear
  D)
             Formation of water from hydrogen and oxygen done clear
  View Solution play_arrow

• question_answer97)
  In nuclear fission, the fission reactions proceeds with a projectile. Which of the following suits the best [EAMCET 1994]
  A)
             Slow proton                          done clear
  B)
             Fast neutron done clear
  C)
             Slow neutron                        done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer98)
  When two deuterium nuclei fuse together to form a tritium nuclei, we get a       [EAMCET 1994; CPMT 2000]
  A)
             Neutron                                  done clear
  B)
             Deutron done clear
  C)
             \[\alpha -\]particle             done clear
  D)
             Proton done clear
  View Solution play_arrow

• question_answer99)
  Name of the India's first nuclear reactor is [EAMCET (Med.) 1995]
  A)
             RAMBHA                                done clear
  B)
             MENAKA done clear
  C)
             URVASI                                   done clear
  D)
             APSARA done clear
  View Solution play_arrow

• question_answer100)
  1 g of hydrogen is converted into 0.993 g of helium in a thermonuclear reaction. The energy released is [EAMCET (Med.) 1995; CPMT 1999]
  A)
             \[63\times {{10}^{7}}J\]   done clear
  B)
             \[63\times {{10}^{10}}J\] done clear
  C)
             \[63\times {{10}^{14}}J\] done clear
  D)
             \[63\times {{10}^{20}}J\] done clear
  View Solution play_arrow

• question_answer101)
  In the nuclear reaction \[_{85}{{X}^{297}}\to Y+4\alpha ,\ Y\]is  [Bihar MEE 1995]
  A)
             \[_{76}{{Y}^{287}}\]           done clear
  B)
             \[_{77}{{Y}^{285}}\] done clear
  C)
             \[_{77}{{Y}^{281}}\]           done clear
  D)
             \[_{77}{{Y}^{289}}\] done clear
  View Solution play_arrow

• question_answer102)
  In the following reaction \[_{12}M{{g}^{24}}{{+}_{2}}H{{e}^{4}}{{\to }_{14}}S{{i}^{X}}{{+}_{0}}{{n}^{1}},X\]is        [SCRA 1994]
  A)
             28   done clear
  B)
             27 done clear
  C)
             26   done clear
  D)
             22 done clear
  View Solution play_arrow

• question_answer103)
  Thermal neutrons can cause fission in                   [SCRA 1994]
  A)
             \[{{U}^{235}}\]                     done clear
  B)
             \[{{U}^{238}}\] done clear
  C)
             \[P{{u}^{238}}\]                   done clear
  D)
             \[T{{h}^{232}}\] done clear
  View Solution play_arrow

• question_answer104)
  In the nuclear reaction \[_{6}{{C}^{11}}{{\to }_{5}}{{B}^{11}}+{{\beta }^{+}}+X\], what does X stand for                                                    [MNR 1998]
  A)
             An electron                           done clear
  B)
             A proton done clear
  C)
             A neutron                              done clear
  D)
             A neutrino done clear
  View Solution play_arrow

• question_answer105)
  When neutrons are bombarded on nucleus of \[_{92}{{U}^{235}}\], the number of emitted neutrons will be      [RPMT 1997]
  A)
             1     done clear
  B)
             2 done clear
  C)
             3     done clear
  D)
             4 done clear
  View Solution play_arrow

• question_answer106)
  Energy released in the fission of a single \[_{92}{{U}^{235}}\] nucleus is 200 MeV. The fission rate of a \[_{92}{{U}^{235}}\]fuelled reactor operating at a power level of 5W is                  [CBSE PMT 1993]
  A)
             \[1.56\times {{10}^{+10}}{{s}^{-1}}\]                             done clear
  B)
             \[1.56\times {{10}^{+11}}{{s}^{-1}}\] done clear
  C)
             \[1.56\times {{10}^{+16}}{{s}^{-1}}\]                             done clear
  D)
             \[1.56\times {{10}^{+17}}{{s}^{-1}}\] done clear
  View Solution play_arrow

• question_answer107)
  The energy released in a typical nuclear fusion reaction is approximately                                               [IIT 1992]
  A)
             25 MeV                                    done clear
  B)
             200 MeV done clear
  C)
             800 MeV                                 done clear
  D)
             1050 MeV done clear
  View Solution play_arrow

• question_answer108)
  Which one of the following nuclear reactions is a source of energy in the sun                                      [BHU 1994]
  A)
             \[_{4}^{9}Be+_{2}^{4}He\to _{6}^{12}C+_{0}^{-1}n\] done clear
  B)
             \[_{2}^{3}He+_{2}^{3}He\to _{2}^{4}He+_{1}^{1}H+_{1}^{1}H\] done clear
  C)
             \[_{56}^{144}Ba+_{56}^{92}Kr\to _{92}^{235}U+_{0}^{-1}n\] done clear
  D)
             \[_{26}^{56}Fe+_{48}^{112}Ca\to _{74}^{167}W+_{0}^{-1}n\]  done clear
  View Solution play_arrow

• question_answer109)
  Heavy water is used as moderator in a nuclear reactor. The function of the moderator is [CBSE PMT 1994; EAMCET (Engg.) 1995; AFMC 2002; DPMT 2003; DCE 2004]
  A)
             To control the energy released in the reactor done clear
  B)
             To absorb neutrons and stop chain reaction done clear
  C)
             To cool the reactor faster done clear
  D)
             To slow down the neutrons to thermal energies done clear
  View Solution play_arrow

• question_answer110)
  Nuclear fission experiments show that the neutrons split the uranium nuclei into two fragments of about same size. This process is accompanied by the emission of several  [CBSE PMT 1994; SCRA 1994; DPMT 2000]
  A)
             Protons and positrons      done clear
  B)
             a-particles done clear
  C)
             Neutrons                                done clear
  D)
             Protons and a-particles done clear
  View Solution play_arrow

• question_answer111)
  \[_{1}{{H}^{1}}{{+}_{1}}{{H}^{1}}{{+}_{1}}{{H}^{2}}\to X+{{\ }_{+1}}{{e}^{0}}+\]energy. The emitted particle is                                       [CPMT 1996]
  A)
             Neutron                                  done clear
  B)
             Proton done clear
  C)
             \[\alpha -\]particle             done clear
  D)
             Neutrino done clear
  View Solution play_arrow

• question_answer112)
  In a nuclear reaction, which of the following is conserved [BHU 1997]
  A)
             Atomic number done clear
  B)
             Mass number done clear
  C)
             Atomic number, mass number and energy done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer113)
  A free neutron decays into a proton, an electron and [CBSE PMT 1997; DPMT 2001]
  A)
             A neutrino                             done clear
  B)
             An antineutrino done clear
  C)
             An alpha particle                 done clear
  D)
             A beta particle done clear
  View Solution play_arrow

• question_answer114)
  Which of the following is used as a moderator in nuclear reactors             [CBSE PMT 1997; AIIMS 1999; AFMC 2001]
  A)
             Uranium                                 done clear
  B)
             Heavy water done clear
  C)
             Cadmium                                done clear
  D)
             Plutonium done clear
  View Solution play_arrow

• question_answer115)
  Energy in the sun is generated mainly by  [JIPMER 1997; AIIMS 1999; BHU 2000]
  A)
             Fusion of radioactive material done clear
  B)
             Fission of helium atoms done clear
  C)
             Chemical reaction done clear
  D)
             Fusion of hydrogen atoms done clear
  View Solution play_arrow

• question_answer116)
  When a slow neutron goes sufficiently close to a \[{{U}^{235}}\]nucleus, then the process that takes place is [AFMC 1998]
  A)
             Fission of \[{{U}^{235}}\] done clear
  B)
             Fusion of neutron done clear
  C)
             Fusion of \[{{U}^{235}}\] done clear
  D)
             First (a) then (b) done clear
  View Solution play_arrow

• question_answer117)
  If a proton and anti-proton come close to each other and annihilate, how much energy will be released [DCE 1999; 2003]
  A)
             \[1.5\times {{10}^{-10}}J\]      done clear
  B)
             \[3\times {{10}^{-10}}J\] done clear
  C)
             \[4.5\times {{10}^{-10}}J\]      done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer118)
  Which of these is a fusion reaction                           [DCE 1999]
  A)
             \[_{3}^{1}H+_{2}^{1}H=_{4}^{2}He+_{1}^{0}n\] done clear
  B)
             \[_{92}^{238}U\,\to \,_{82}^{206}Pb+8\,(_{2}^{4}He)+6\,(_{-1}^{0}\beta )\] done clear
  C)
             \[_{7}^{12}C\,\to \,_{6}^{12}C+{{\beta}^{+}}+\gamma \] done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer119)
  In a nuclear fission reaction                            [AMU (Med.) 2000]
  A)
             Two light nuclei combine to produce a heavier nucleus 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)
             A heavy nucleus breaks up by itself done clear
  View Solution play_arrow

• question_answer120)
  Hydrogen bomb is based on which of the following phenomenon                                            [CPMT 2000]
  A)
             Nuclear fission                     done clear
  B)
             Nuclear fusion done clear
  C)
             Radioactive decay               done clear
  D)
             None of these done clear
  View Solution play_arrow

• question_answer121)
  The number of neutrons released when \[_{92}{{U}^{235}}\] undergoes fission by absorbing \[_{0}{{n}^{1}}\] and \[{{(}_{56}}B{{a}^{144}}{{+}_{36}}K{{r}^{89}})\] are formed, is                                    [Pb. PMT 2000]
  A)
             0     done clear
  B)
             1 done clear
  C)
             2     done clear
  D)
             3 done clear
  View Solution play_arrow

• question_answer122)
  Energy released in fusion of 1 kg of deuterium nuclei  [RPET 2000]                               
  A)
             \[8\times {{10}^{13}}\,J\] done clear
  B)
             \[6\times {{10}^{27}}\,J\] done clear
  C)
             \[2\times {{10}^{7}}\,KwH\]  done clear
  D)
             \[8\times {{10}^{23}}\,MeV\] done clear
  View Solution play_arrow

• question_answer123)
  Best neutron moderator is                                         [RPET 2000]
  A)
             Berillium oxide                     done clear
  B)
             Pure water done clear
  C)
             Heavy water                         done clear
  D)
             Graphite done clear
  View Solution play_arrow

• question_answer124)
  Nuclear fission was discovered by                           [RPET 2000]
  A)
             Auto Hahn and F. strassmann done clear
  B)
             Fermi done clear
  C)
             Bethe done clear
  D)
             Rutherford done clear
  View Solution play_arrow

• question_answer125)
  Which of the following is true for a sample of isotope containing \[{{U}^{235}}\] and \[{{U}^{238}}\]                        [RPET 2000]
  A)
             Number of neutron are same in both done clear
  B)
             Number of proton, electron and neutron are same in both done clear
  C)
             Contain same number of protons and electrons but U238 contains 3 more neutrons than U235 done clear
  D)
             U238 contains 3 less neutron then U235 done clear
  View Solution play_arrow

• question_answer126)
  Which of the following particle has similar mass to electron [RPMT 2000]
  A)
             Proton                                     done clear
  B)
             Neutron done clear
  C)
             Positron                                  done clear
  D)
             Neutrino done clear
  View Solution play_arrow

• question_answer127)
  Boron rods in nuclear reactor are used as a       [RPMT 2000]
  A)
             Moderator                             done clear
  B)
             Control rods done clear
  C)
             Coolants                                 done clear
  D)
             Protective shield done clear
  View Solution play_arrow

• question_answer128)
  If the energy released in the fission of one nucleus is 200 MeV. Then the number of nuclei required per second in a power plant of 16 kW will be                    [KCET (Engg.) 2000; CPMT 2001; Pb. PET 2002]
  A)
             \[0.5\times {{10}^{14}}\] done clear
  B)
             \[0.5\times {{10}^{12}}\] done clear
  C)
             \[5\times {{10}^{12}}\]     done clear
  D)
             \[5\times {{10}^{14}}\] done clear
  View Solution play_arrow

• question_answer129)
  Neutrino is a particle, which is          [AIIMS 2000]
  A)
             Charged and has spin done clear
  B)
             Charged and has no spin done clear
  C)
             Charge less and has spin done clear
  D)
             Charge less and has no spin done clear
  View Solution play_arrow

• question_answer130)
  To generate a power of 3.2 mega watt, the number of fissions of \[{{U}^{235}}\] per minute is (Energy released per fission = 200MeV, \[1eV=1.6\times {{10}^{-19}}J)\][EAMCET (Engg.) 2000]
  A)
             \[6\times {{10}^{18}}\]     done clear
  B)
             \[6\times {{10}^{17}}\] done clear
  C)
             \[{{10}^{17}}\]                      done clear
  D)
             \[6\times {{10}^{16}}\] done clear
  View Solution play_arrow

• question_answer131)
  The average number of prompt neutrons produced per fission of  \[{{U}^{235}}\]is                                         [MP PMT 2000]      
  A)
             More than 5                          done clear
  B)
             3 to 5 done clear
  C)
             2 to 3                                        done clear
  D)
             1 to 2 done clear
  View Solution play_arrow

• question_answer132)
  In the nuclear reaction: \[X(n,\,\alpha ){{\,}_{3}}L{{i}^{7}}\] the term X will be  3 [CBSE PMT 2001; AIEEE 2005]
  A)
             \[_{5}{{B}^{10}}\]               done clear
  B)
             \[_{5}{{B}^{9}}\] done clear
  C)
             \[_{5}{{B}^{11}}\]               done clear
  D)
             \[_{2}H{{e}^{4}}\] done clear
  View Solution play_arrow

• question_answer133)
  In an atomic bomb, the energy is released due to  [AIIMS 2001]
  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
  View Solution play_arrow

• question_answer134)
  If an electron and a positron annihiliate, then the energy released is                                       [DCE 2001; AIIMS 2004]
  A)
             \[3.2\times {{10}^{-13}}J\]      done clear
  B)
             \[1.6\times {{10}^{-13}}J\] done clear
  C)
             \[4.8\times {{10}^{-13}}J\]      done clear
  D)
             \[6.4\times {{10}^{-13}}J\] done clear
  View Solution play_arrow

• question_answer135)
  The binding energy per nucleon of deuterium and helium atom is 1.1 MeV and 7.0 MeV. If two deuterium nuclei fuse to form helium atom, the energy released is           [Pb. PMT 2001; CPMT 2001; AIEEE 2004]
  A)
             19.2 MeV                                done clear
  B)
             23.6 MeV done clear
  C)
             26.9 MeV                                done clear
  D)
             13.9 MeV done clear
  View Solution play_arrow

• question_answer136)
  The energy liberated on complete fission of 1 kg of \[_{92}{{U}^{235}}\] is (Assume 200 MeV energy is liberated on fission of 1 nucleus)                                                                 [UPSEAT 2003]
  A)
             \[8.2\times {{10}^{10}}J\]       done clear
  B)
             \[8.2\times {{10}^{9}}J\] done clear
  C)
             \[8.2\times {{10}^{13}}J\]       done clear
  D)
             \[8.2\times {{10}^{16}}J\] done clear
  View Solution play_arrow

• question_answer137)
  Which one of the following statements about uranium is correct                                               [UPSEAT 2002]
  A)
             \[^{235}U\] is fissionable by thermal neutrons done clear
  B)
             Fast neutrons trigger the fission process in \[n=1\text{ to }n=2\] done clear
  C)
             \[^{238}U\] breaks up into fragments when bombarded by slow neutrons done clear
  D)
             \[n=2\text{ to} n=1\] is an unstable isotope and undergoes spontaneous fission done clear
  View Solution play_arrow

• question_answer138)
  In nuclear fission the percentage of mass converted into energy is about                                              [KCET 2002]
  A)
             10%                                           done clear
  B)
             0.01% done clear
  C)
             0.1%                                         done clear
  D)
             1% done clear
  View Solution play_arrow

• question_answer139)
  In a material medium, when a positron meets an electron both the particles annihilate leading to the emission of two gamma ray photons. This process forms the basis of an important diagnostic procedure called    [AIIMS 2003]
  A)
             MRI                                           done clear
  B)
             PET done clear
  C)
             CAT                                           done clear
  D)
             SPECT done clear
  View Solution play_arrow

• question_answer140)
  The nuclear reaction \[^{2}H{{+}^{2}}H\to {{\,}^{4}}He\] (mass of deuteron = 2.0141 a.m.u. and mass of He = 4.0024 a.m.u.) is [Orissa JEE 2002]
  A)
             Fusion reaction releasing 24 MeV energy done clear
  B)
             Fusion reaction absorbing 24 MeV energy done clear
  C)
             Fission reaction releasing 0.0258 MeV energy done clear
  D)
             Fission reaction absorbing 0.0258 MeV energy done clear
  View Solution play_arrow

• question_answer141)
  In the following reaction the value of ?X? is \[_{7}{{N}^{14}}{{+}_{2}}H{{e}^{4}}\,\to \,X{{+}_{1}}{{H}^{1}}\]                    [DPMT 1999; CPMT 2003]
  A)
             \[_{8}{{N}^{17}}\]               done clear
  B)
             \[_{8}{{O}^{17}}\] done clear
  C)
             \[_{7}{{O}^{16}}\]               done clear
  D)
             \[_{7}{{N}^{16}}\] done clear
  View Solution play_arrow

• question_answer142)
  A \[{{\pi }^{0}}\] at rest decays into \[2\gamma \] rays \[{{\pi }^{0}}\to \gamma +\gamma \]. Then which of the following can happen  [CPMT 2002]
  A)
             The two \[\gamma 's\] move in same direction done clear
  B)
             The two \[\gamma 's\] move in opposite direction done clear
  C)
             Both repel each other done clear
  D)
             Both attract each other done clear
  View Solution play_arrow

• question_answer143)
  Which of the following are suitable for the fusion process  [CBSE PMT 2002]
  A)
             Heavy nuclei                         done clear
  B)
             Light nuclei done clear
  C)
             Atom bomb                           done clear
  D)
             Radioactive decay done clear
  View Solution play_arrow

• question_answer144)
  A deutron is bombarded on \[_{8}{{O}^{16}}\] nucleus and a-particle is emitted. The product nucleus is               [CBSE PMT 2002]
  A)
             \[_{7}{{N}^{13}}\]               done clear
  B)
             \[_{5}{{B}^{10}}\] done clear
  C)
             \[_{4}B{{c}^{9}}\]                done clear
  D)
             \[_{7}{{N}^{14}}\] done clear
  View Solution play_arrow

• question_answer145)
  A nuclear reaction given by \[_{Z}{{X}^{A}}\,\to {{\,}_{Z+1}}{{Y}^{A}}{{+}_{-1}}{{e}^{0}}+\bar{p}\] represents    [CBSE PMT 2003]
  A)
             g-decay                                   done clear
  B)
             Fusion done clear
  C)
             Fission                                     done clear
  D)
             b-decay done clear
  View Solution play_arrow

• question_answer146)
  Work of moderator is                                                  [AFMC 2003]
  A)
             To control the velocity of neutrons done clear
  B)
             Cooling done clear
  C)
             As fuel done clear
  D)
             It is used for safety done clear
  View Solution play_arrow

• question_answer147)
  Light energy emitted by stars is due to          [Orissa JEE 2003]
  A)
             Breaking of nuclei               done clear
  B)
             Joining of nuclei done clear
  C)
             Burning of nuclei                 done clear
  D)
             Reflection of solar light done clear
  View Solution play_arrow

• question_answer148)
  Solar energy is mainly caused due to              [CBSE PMT 2003]
  A)
             Fission of uranium present in the sun done clear
  B)
             Fusion of protons during synthesis of heavier elements done clear
  C)
             Gravitational contraction done clear
  D)
             Burning of hydrogen in the oxygen done clear
  View Solution play_arrow

• question_answer149)
  The binding energy of nucleus is a measure of its [MP PMT 2004
  A)
             Charge                                     done clear
  B)
             Mass done clear
  C)
             Momentum                          done clear
  D)
             Stability done clear
  View Solution play_arrow

• question_answer150)
  Mark the correct statement                                 [MP PMT 2004]
  A)
             Nuclei of different elements can have the same number of neutrons done clear
  B)
             Every element has only two stable isotopes done clear
  C)
             Only one isotope of each element is stable done clear
  D)
             All isotopes of every element are radioactive done clear
  View Solution play_arrow

• question_answer151)
  The nuclear reactor at Kaiga is a                                [KCET 2004]
  A)
             Fusion reactor                      done clear
  B)
             Research reactor done clear
  C)
             Power reactor                      done clear
  D)
             Breeder reactor done clear
  View Solution play_arrow

• question_answer152)
  Heavy water is                                                                 [KCET 2004]
  A)
             Water at \[{{4}^{o}}C\] done clear
  B)
             Compound of deuterium and oxygen         done clear
  C)
             Compound of heavy oxygen and heavy hydrogen done clear
  D)
             Water, in which soap does not lather done clear
  View Solution play_arrow

• question_answer153)
  If M is the atomic mass and A is the mass number, packing fraction is given by                                    [KCET 2004]
  A)
             \[\frac{A}{M-A}\]               done clear
  B)
             \[\frac{A-M}{A}\] done clear
  C)
             \[\frac{M}{M-A}\]              done clear
  D)
             \[\frac{M-A}{A}\] done clear
  View Solution play_arrow

• question_answer154)
  \[{{M}_{p}}\] denotes the mass of a proton and \[{{M}_{n}}\] 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)              [CBSE PMT 2004]
  A)
             \[M(N,\,Z)=N{{M}_{n}}+Z{{M}_{p}}-B{{c}^{2}}\] done clear
  B)
             \[M(N,\,Z)=N{{M}_{n}}+Z{{M}_{p}}+B{{c}^{2}}\] done clear
  C)
             \[M(N,\,Z)=N{{M}_{n}}+Z{{M}_{p}}-B/{{c}^{2}}\] done clear
  D)
             \[M(N,\,Z)=N{{M}_{n}}+Z{{M}_{p}}+B/{{c}^{2}}\] done clear
  View Solution play_arrow

• question_answer155)
  If in a nuclear fusion process the masses of the fusing nuclei be \[{{m}_{1}}\] and \[{{m}_{2}}\] and the mass of the resultant nucleus be \[{{m}_{3}}\], then [CPMT 1982; CBSE PMT 2004]
  A)
             \[{{m}_{3}}={{m}_{1}}+{{m}_{2}}\]                                 done clear
  B)
             \[{{m}_{3}}=\ |{{m}_{1}}+{{m}_{2}}|\] done clear
  C)
             \[{{m}_{3}}<({{m}_{1}}+{{m}_{2}})\]                              done clear
  D)
             \[{{m}_{3}}>({{m}_{1}}+{{m}_{2}})\] done clear
  View Solution play_arrow

• question_answer156)
  The principle of controlled chain reaction is used in [Orissa PMT 2004]
  A)
             Atomic energy reactor      done clear
  B)
             Atom bomb done clear
  C)
             The core of sun                        done clear
  D)
             Artificial radioactivity done clear
  View Solution play_arrow

• question_answer157)
  \[_{6}^{12}C\] absorbs an energetic neutron and emits beta particles. The resulting nucleus is                   [Kerala PMT 2004]
  A)
             \[_{7}^{14}N\]                     done clear
  B)
             \[_{7}^{13}N\] done clear
  C)
             \[_{5}^{13}B\]                      done clear
  D)
             \[_{6}^{13}C\] done clear
  View Solution play_arrow

• question_answer158)
  Complete the reaction\[n+\,_{92}^{235}U\to \,_{56}^{144}Ba+....+3n\]                                                [Kerala PMT 2004]
  A)
             \[_{36}^{89}Kr\]                  done clear
  B)
             \[_{36}^{90}Kr\] done clear
  C)
             \[_{36}^{91}Kr\]                  done clear
  D)
             \[_{36}^{92}Kr\] done clear
  View Solution play_arrow

• question_answer159)
  Nuclear fusion is common to the pair                   [CPMT 2004]
  A)
             Thermonuclear reactor, uranium based nuclear reactor done clear
  B)
             Energy production in sun, uranium based nuclear reactor done clear
  C)
             Energy production in sun, hydrogen bomb done clear
  D)
             Disintegration of heavy nuclei, hydrogen bomb done clear
  View Solution play_arrow

• question_answer160)
  1 atomic mass unit is equal to                                [Pb. PET 2001]
  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
  View Solution play_arrow

• question_answer161)
  The nucleus \[_{92}{{U}^{234}}\] splits exactly in half in a fission reaction in which two neutrons are released. The resultant nuclei are [UPSEAT 2004]
  A)
             \[_{46}P{{d}^{116}}\]        done clear
  B)
             \[_{45}R{{h}^{117}}\] done clear
  C)
             \[_{45}R{{h}^{116}}\]        done clear
  D)
             \[_{46}P{{d}^{117}}\] done clear
  View Solution play_arrow

• question_answer162)
  A nucleus of  \[_{84}^{210}Po\] originally at rest emits a particle with speed v. What will be the recoil speed of the daughter nucleus                                                             [DCE 2002]
  A)
             4v/206                                     done clear
  B)
             4v/214 done clear
  C)
             v/206                                        done clear
  D)
             v/214 done clear
  View Solution play_arrow

• question_answer163)
  In a nuclear reactor, the fuel is consumed at the rate of 1 mg/s. The power generated in kilowatt is [DCE 2003]
  A)
             \[9\times {{10}^{4}}\]       done clear
  B)
             \[9\times {{10}^{7}}\] done clear
  C)
             \[9\times {{10}^{8}}\]       done clear
  D)
             \[9\times {{10}^{12}}\] done clear
  View Solution play_arrow

• question_answer164)
  What is used as a moderator in a nuclear reactor [DCE 2004]
  A)
             Water                                      done clear
  B)
             Graphite done clear
  C)
             Cadmium                                  done clear
  D)
             Steel done clear
  View Solution play_arrow

• question_answer165)
  A nucleus is bombarded with a high speed neutron so that resulting nucleus is a radioactive one. This phenomenon is called                                                                      [DCE 2004]
  A)
             Artificial radioactivity         done clear
  B)
             Fusion done clear
  C)
             Fission                                     done clear
  D)
             Radioactivity done clear
  View Solution play_arrow

• question_answer166)
  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                                                          [DCE 2004]
  A)
             Can easily be broken up done clear
  B)
             Is very stable done clear
  C)
             Can be used as fissionable material done clear
  D)
             Is radioactive done clear
  View Solution play_arrow

• question_answer167)
  Which of the following cannot cause fission in a heavy nucleus                                   [RPET 2002]
  A)
             a-particle                               done clear
  B)
             Proton done clear
  C)
             Deutron                                  done clear
  D)
             Laser rays done clear
  View Solution play_arrow

• question_answer168)
  The energy in MeV is released due to transformation of 1 kg mass completely into energy \[(c=3\times {{10}^{8}}m/s)\]                   [Pb. PMT 2003]
  A)
             \[7.625\times 10\,MeV\] done clear
  B)
             \[10.5\times {{10}^{29}}\,MeV\] done clear
  C)
             \[2.8\times {{10}^{-28}}\,MeV\]                                      done clear
  D)
             \[5.625\times {{10}^{29}}\,MeV\] done clear
  View Solution play_arrow

• question_answer169)
  If in a nuclear fission, piece of uranium of mass 0.5 g is lost, the energy obtained in kWh is                            [Pb. PET 2003]
  A)
             \[1.25\times {{10}^{7}}\] done clear
  B)
             \[2.25\times {{10}^{7}}\] done clear
  C)
             \[3.25\times {{10}^{7}}\] done clear
  D)
             \[0.25\times {{10}^{7}}\] done clear
  View Solution play_arrow

• question_answer170)
  When \[{{U}^{235}}\] is bombarded with one neutron, the fission occurs and the products are three neutrons, \[_{36}K{{r}^{94}}\] and [Pb. PET 2004; UPSEAT 2004]
  A)
             \[_{53}{{I}^{142}}\]            done clear
  B)
             \[_{56}B{{a}^{139}}\] done clear
  C)
             \[_{58}C{{e}^{139}}\]        done clear
  D)
             \[_{54}X{{e}^{139}}\] done clear
  View Solution play_arrow

• question_answer171)
  The atoms of same element having different masses but same chemical properties, are called   [RPMT 2002]
  A)
             Isotones                                 done clear
  B)
             Isotopes done clear
  C)
             Isobars                                       done clear
  D)
             Isomers done clear
  View Solution play_arrow

• question_answer172)
  If the mass number of an atom is \[A=40\] and its electron configuration is \[1{{s}^{2}},\ 2{{s}^{2}},\ 2{{p}^{6}},\ 3{{s}^{2}},\ 3{{p}^{6}}\], the number of neutrons and protons in its nucleus will be  [RPMT 2002]
  A)
             22, 18                                       done clear
  B)
             18, 22 done clear
  C)
             20, 20                                        done clear
  D)
             18, 18 done clear
  View Solution play_arrow

• question_answer173)
  Which of the following is most unstable             [AFMC 2005]
  A)
             Electrons                                done clear
  B)
             Protons done clear
  C)
             Neutrons                                done clear
  D)
             \[\alpha \]-particle done clear
  View Solution play_arrow

• question_answer174)
  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                                                                                                   [CBSE PMT 2005]
  A)
             \[c+a-b\]                                done clear
  B)
             \[c-a-b\] done clear
  C)
             \[a+b+c\]                               done clear
  D)
             \[a+b-c\] done clear
  View Solution play_arrow

• question_answer175)
  The nuclei of which one of the following pairs of nuclei are isotones                                        [CBSE PMT 2005]
  A)
             \[_{34}S{{e}^{74}},\,{{\,}_{31}}C{{a}^{71}}\]               done clear
  B)
             \[_{42}M{{o}^{92}},\,{{\,}_{40}}Z{{r}^{92}}\] done clear
  C)
             \[_{38}S{{r}^{81}},\,{{\,}_{38}}S{{r}^{86}}\]                 done clear
  D)
             \[_{20}C{{a}^{40}},\,{{\,}_{16}}{{S}^{32}}\] done clear
  View Solution play_arrow

• question_answer176)
  Fission of nuclei is possible because the binding energy per nucleon in them                       [CBSE PMT 2005]
  A)
             Increases with mass number at high mass numbers done clear
  B)
             Decreases with mass number at high mass numbers done clear
  C)
             Increases with mass number at low mass numbers done clear
  D)
             Decreases with mass number at low mass numbers done clear
  View Solution play_arrow

• question_answer177)
  In any fission process the ratio \[\frac{\text{mass of fission products}}{\text{mass of parent nucleus}}\] is [CBSE PMT 2005]
  A)
             Less than 1 done clear
  B)
             Greater than 1 done clear
  C)
             Equal to 1                               done clear
  D)
             Depends on the mass of the parent nucleus done clear
  View Solution play_arrow

• question_answer178)
  If radius of the \[_{13}^{27}Al\] nucleus is estimated to be 3.6 Fermi then the radius of  \[_{52}^{125}Te\]nucleus be nearly                   [AIEEE 2005]
  A)
             4 Fermi                                    done clear
  B)
             5 Fermi done clear
  C)
             6 Fermi                                    done clear
  D)
             8 Fermi done clear
  View Solution play_arrow

• question_answer179)
  The example of nuclear fusion is                            [BCECE 2005]
  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
  View Solution play_arrow