Solved papers for NEET Physics Atomic Physics NEET PYQ-Atomic Physics

done NEET PYQ-Atomic Physics Total Questions - 41

• question_answer1) Ratio of longest wavelengths corresponding to Lyman and Bulmer series in hydrogen spectrum is           [NEET 2013]
  A)
   \[\frac{5}{27}\]
  done clear
  B)
   \[\frac{3}{23}\]
  done clear
  C)
   \[\frac{7}{29}\]            
  done clear
  D)
        \[\frac{9}{31}\]
  done clear
  View Answer play_arrow

• question_answer2) The 21 cm radio wave emitted by hydrogen in interstellar space is due to the interaction called the hyperfine interaction in atomic hydrogen. The energy of the emitted wave is nearly:                                                                        [AIPMT 1998]
  A)
         \[{{10}^{-17}}\,J\]                 
  done clear
  B)
   1 J                  
  done clear
  C)
   \[7\times {{10}^{-6}}\,J\]
  done clear
  D)
                  

  \[{{10}^{-24}}\,J\] done clear View Answer play_arrow question_answer3) In the Bohr's model of a hydrogen atom, the centripetal force is furnished by the Coulomb attraction between the proton and the electron. If \[{{a}_{0}}\] is the radius of the ground state orbit, m is the mass and e is the charge on the electron, \[{{\varepsilon }_{0}}\] is the vacuum permittivity, the speed of the electron is :                  [AIPMT 1998] A)  zero      done clear B)                   \[\frac{e}{\sqrt{{{\varepsilon }_{0}}{{a}_{0}}m}}\] done clear C)  \[\frac{e}{\sqrt{4\pi {{\varepsilon }_{0}}{{a}_{0}}m}}\] done clear D)                   \[\frac{\sqrt{4\pi {{\varepsilon }_{0}}{{a}_{0}}m}}{e}\] done clear View Answer play_arrow question_answer4) The resistance of a discharge tube is:                                                                     [AIPMT 1999] A)  zero        done clear B)     ohmic done clear C)  non-ohmic done clear D)      infinity done clear View Answer play_arrow question_answer5) When electron jumps from \[n=4\] to \[n=2\] orbit, we get:                                     [AIPMT 2000] A)  second line of Lyman series                     done clear B)       second line of Balmer series done clear C)  second line of Paschen series done clear D)       an absorption line of Balmer series done clear View Answer play_arrow question_answer6) Which of the following transitions gives photon of maximum energy?                        [AIPMT 2000] A)  \[n=1\] to \[n=2\] done clear B)       \[n=2\] to \[n=1\] done clear C)  \[n=2\] to \[n=6\]          done clear D)  \[n=6\] to \[n=2\] done clear View Answer play_arrow question_answer7) The energy of a photon of light is 3 eV. Then the wavelength of photon must be:                     [AIPMT 2000] A)          4125 nm done clear B)     412.5 nm done clear C)  41250 nm done clear D)           4 nm   done clear View Answer play_arrow question_answer8) The value of Planck's constant is:                                                                                      [AIPMT 2002] A)        \[6.63\times {{10}^{-34}}\,J/s\] done clear B)                               \[6.63\times {{10}^{-34}}\,kg-m/s\] done clear C)                   \[6.63\times {{10}^{-34}}\,kg-{{m}^{2}}\] done clear D)       \[6.63\times {{10}^{-34}}\,J-s\] done clear View Answer play_arrow question_answer9) Which of the following is not the property of cathode rays?                         [AIPMT 2002] A)  It produces heating effect done clear B)                   It does not deflect in electric field done clear C)       Its casts shadow done clear D)       It produces fluorescence done clear View Answer play_arrow question_answer10) J.J. Thomson's cathode-ray tube experiment demonstrated that:                  [AIPMT 2003] A)  the e/m of electrons is greater than the e/m of protons done clear B)       the e/m ratio of the cathode-ray particles changes when a different gas is placed in the discharge tube done clear C)       cathode rays axe streams of negatively charged ions done clear D)       all the mass of an atom is essentially in the nucleus done clear View Answer play_arrow question_answer11) In which of the following systems will the radius of the first orbit \[(n=1)\] be minimum?                       [AIPMT 2003] A)        Deuterium atom done clear B)                   Hydrogen atom done clear C)  Doubly ionized lithium done clear D)  Singly ionized helium done clear View Answer play_arrow question_answer12) The mass number of a nucleus is:                                                              [AIPMT 2003] A)  sometimes equal to its atomic number done clear B)       sometimes less than and sometimes more than its atomic number done clear C)       always less than its atomic number done clear D)       always more than its atomic number done clear View Answer play_arrow question_answer13) A nucleus represented by the symbol \[_{Z}^{A}X\]has:                                                    [AIPMT (S) 2004] A)        Z neutrons and A -Z protons                    done clear B)  Z protons and A-Z neutrons done clear C)  Z protons and A neutrons done clear D)                   A protons and Z-A neutrons done clear View Answer play_arrow question_answer14) The Bohr model of atoms: A)  assumes that the angular momentum of electrons is quantized done clear B)       uses Einstein's photoelectric equation done clear C)       predicts continuous emission spectra for atoms done clear D)       predicts the same emission spectra for all types of atoms done clear View Answer play_arrow question_answer15) Energy E of a hydrogen atom with principal quantum number n is given by \[E=\frac{-13.6}{{{n}^{2}}}eV\]. The energy of a photon ejected when the electron jumps from \[n=3\] state to \[n=2\] state of hydrogen, is approximately:                                                                                                                                      [AIPMT (S) 2004] A)  1.5 eV              done clear B)       0.85 eV done clear C) 3.4 eV  done clear D)  1.9 eV done clear View Answer play_arrow question_answer16) Energy levels A, B and C of a certain atom correspond to increasing values of energy i.e., \[{{E}_{A}}<{{E}_{B}}<{{E}_{C}}\]. If \[{{\lambda }_{1}},\,{{\lambda }_{2}}\] and \[{{\lambda }_{3}}\] are wavelengths of radiations corresponding to transitions C to B, B to A and C to A respectively, which of the following relations is correct?                                                                                                 [AIPMT (S) 2005] A)  \[{{\lambda }_{3}}={{\lambda }_{1}}+{{\lambda }_{2}}\]      done clear B)      \[{{\lambda }_{3}}=\frac{{{\lambda }_{1}}{{\lambda }_{2}}}{{{\lambda }_{1}}+{{\lambda }_{2}}}\] done clear C)  \[{{\lambda }_{1}}+{{\lambda }_{2}}+{{\lambda }_{3}}=0\] done clear D)       \[\lambda _{3}^{2}=\lambda _{1}^{2}+\lambda _{2}^{2}\] done clear View Answer play_arrow question_answer17) The nuclei of which one of the following pairs of nuclei are isotones?     [AIPMT (S) 2005] A)  \[_{34}S{{e}^{74}},{{\,}_{31}}G{{a}^{71}}\]         done clear B)  \[_{42}M{{o}^{92}}\,,{{\,}_{40}}Z{{r}^{92}}\] done clear C)  \[_{38}S{{r}^{84}},{{\,}_{38}}S{{r}^{86}}\]           done clear D)  \[_{20}C{{a}^{40}},\,{{\,}_{16}}{{S}^{32}}\] done clear View Answer play_arrow question_answer18) The total energy of an electron in the first excited state of hydrogen is about \[-3.4\text{ }eV\]. Its kinetic energy in this state is:                                                                                                           [AIPMT (S) 2005] A)  \[-3.4\text{ }eV\] done clear B)                   \[-6.8\,eV\] done clear C)  \[6.8\text{ }eV\]   done clear D)             \[3.4\text{ }eV\] done clear View Answer play_arrow question_answer19) Ionization potential of hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr's theory, the spectral lines emitted by hydrogen will be:     [AIPMT (S) 2006] A)  two    done clear B)    three     done clear C)  four       done clear D)  one done clear View Answer play_arrow question_answer20) In a discharge tube ionization of enclosed gas is produced due to collisions between:                 [AIPMT (S) 2006] A)  positive ions and neutral atoms/molecules done clear B)  negative electrons and neutral atoms/molecules done clear C)       photons and neutral atoms/molecules done clear D)       neutral gas atoms/molecules done clear View Answer play_arrow question_answer21) The total energy of electron in the ground state of hydrogen atom is \[-13.6\text{ }eV\]. The kinetic energy of an electron in the first excited state is:                                                                                             [AIPMT (S) 2007] A)        3.4 eV                done clear B)       6.8 eV done clear C)  13.6 eV  done clear D)  1.7 eV done clear View Answer play_arrow question_answer22) The work function of a surface of a photosensitive material is 6.2 eV. The wavelength, of the incident radiation for which the stopping potential is 5 V lies in the                                                               [AIPMPT (S) 2008] A)  ultraviolet region done clear B)       visible region done clear C)  infrared region   done clear D)       X-ray region done clear View Answer play_arrow question_answer23)  A particle shows distance-time curve as given in this figure. The maximum instantaneous velocity of the particle is around the point                                                                                         [AIPMPT (S) 2008] A)  B           done clear B)  C done clear C)       D          done clear D)                          A done clear View Answer play_arrow question_answer24) An alpha nucleus of energy \[\frac{1}{2}m{{v}^{2}}\] bombards a heavy nuclear target of charge Ze. Then the distance of closest approach for the alpha nucleus will be proportional to A)  \[\frac{1}{Ze}\]             done clear B)  \[{{v}^{2}}\] done clear C)  \[\frac{1}{m}\]             done clear D)       \[\frac{1}{{{v}^{4}}}\] done clear View Answer play_arrow question_answer25) The electron in the hydrogen atom jumps from excited state \[(n=3)\] to its ground state \[(n=1)\] and the photons thus emitted irradiate a photosensitive material. If the work function of the material is 5.1 eV, the stopping potential is estimated to be (the energy of the electron in nth state \[{{E}_{n}}=-\frac{13.6}{{{n}^{2}}}eV\])           [AIPMT (M) 2010] A)  5.1 V      done clear B)  12.1 V done clear C)  17.2 V       done clear D)    7 V done clear View Answer play_arrow question_answer26) Out of the following which one is not a possible energy for a photon to be emitted by hydrogen atom according to Bohr's atomic model?                                                                                                              [AIPMT (M) 2011] A)  1.9 eV    done clear B)  11.1 eV done clear C)  13.6 eV  done clear D)        0.65 eV done clear View Answer play_arrow question_answer27) The wavelength of the first line of Lyman series for hydrogen atom is equal to that of the second line of Balmer series for a hydrogen like ion. The atomic number Z of hydrogen like ion is                                             [AIPMT (S) 2011] A)  4             done clear B)  1 done clear C)                   2                     done clear D)       3 done clear View Answer play_arrow question_answer28)                  The transition from the state \[n=3\] to \[n=1\] in a hydrogen like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from                                                                              [AIPMT (M) 2012] A)  \[2\to 1\]           done clear B)       \[3\to 2\]           done clear C)  \[4\to 2\]           done clear D)       \[4\to 3\] done clear View Answer play_arrow question_answer29) Electron in hydrogen atom first jumps from third excited state to second excited state and then from second excited to the first excited state. The ratio of the wavelengths \[{{\lambda }_{1}}:{{\lambda }_{2}}\] emitted in the two cases is                                                                                                                                         [AIPMT (S) 2012] A)  7/5                   done clear B)  27/20 done clear C)       27/5                 done clear D)       20/7 done clear View Answer play_arrow question_answer30) An electron of a stationary hydrogen atom passes from the fifth energy level to the ground level. The velocity that the atom acquired as a result of photon emission will be                                                                    [AIPMT (S) 2012] A)  \[\frac{24\,hR}{25\,m}\] done clear B)       \[\frac{25\,hR}{24\,m}\] done clear C)  \[\frac{25\,m}{24\,h\,R}\]          done clear D)       \[\frac{24\,m}{25\,h\,R}\] done clear View Answer play_arrow question_answer31) Hydrogen atom in ground state is excited by a monochromatic   radiation   of \[\lambda =975\,\overset{o}{\mathop{A}}\,\]. Number of spectral lines in the resulting spectrum emitted will be                                           [NEET 2014] A)  3      done clear B)  2 done clear C)                   6          done clear D)  10 done clear View Answer play_arrow question_answer32) Consider \[{{3}^{rd}}\] orbit of \[H{{e}^{+}}\] (Helium), using non-relativistic approach, the speed of electron in this orbit will be (given \[K=9\times {{10}^{9}}\] constant, \[Z=2\]and h (Planck's constant) \[=6.6\times {{10}^{-34}}J-s\]) [NEET  2015] A)  \[2.92\times {{10}^{6}}m/s\] done clear B)       \[1.46\times {{10}^{6}}m/s\] done clear C)  \[0.73\times {{10}^{6}}m/s\]   done clear D)       \[3.0\times {{10}^{8}}m/s\] done clear View Answer play_arrow question_answer33) In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series is                                                                                                              [NEET (Re) 2015] A)  \[\frac{4}{9}\]              done clear B)       \[\frac{9}{4}\] done clear C)  \[\frac{27}{5}\]      done clear D)  \[\frac{5}{27}\] done clear View Answer play_arrow question_answer34) An electron of mass m and a photon have same energy E. The ratio of de-Broglie wavelengths associated with them is :          [NEET - 2016] A)  \[\frac{1}{c}{{\left( \frac{E}{2m} \right)}^{\frac{1}{2}}}\]        done clear B)              \[{{\left( \frac{E}{2m} \right)}^{\frac{1}{2}}}\] done clear C)  \[c{{\left( 2mE \right)}^{\frac{1}{2}}}\] done clear D)       \[\frac{1}{xc}{{\left( \frac{2m}{E} \right)}^{\frac{1}{2}}}\] (c being velocity of light) done clear View Answer play_arrow question_answer35) When an \[\alpha -\]particle of mass 'm' moving with velocity \['v'\] bombards on a heavy nucleus of charge \['Ze'\], its distance of closest approach from the nucleus depends on m as :                                                        [NEET - 2016] A)  \[\frac{1}{m}\]             done clear B) \[\frac{1}{\sqrt{m}}\] done clear C)  \[\frac{1}{{{m}^{2}}}\]                      done clear D)       m done clear View Answer play_arrow question_answer36) Given the value of Rydberg constant is \[{{10}^{7}}{{m}^{-1}},\] the wave number of the last line of the Balmer series in hydrogen spectrum will be :-                                                                     [NEET - 2016] A)  \[0.025\times {{10}^{4}}\text{ }{{m}^{1}}\] done clear B)       \[0.5\times {{10}^{7}}\text{ }{{m}^{1}}\] done clear C)  \[0.25\times {{10}^{7}}\text{ }{{m}^{1}}\] done clear D)       \[2.5\times {{10}^{7}}\text{ }{{m}^{1}}\] done clear View Answer play_arrow question_answer37) The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is                  [NEET-2017] A)  0.5                   done clear B) 2 done clear C)  1                     done clear D)       4 [d] For last Balmer series done clear View Answer play_arrow question_answer38) The ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom, is      [NEET - 2018] A)  2 : -1    done clear B)       1 : - 1 done clear C)  1 : 1                 done clear D)       1 : - 2 done clear View Answer play_arrow question_answer39) \[\alpha \]-particle consists of:                                                                                [NEET 2019] A)  2 electrons and 4 protons only done clear B)  2 protons only done clear C)  2 protons and 2 neutrons only done clear D)  2 electrons, 2 protons and 2 neutrons done clear View Answer play_arrow question_answer40) The total energy of an electron in an atom in an orbit is -3.4 eV. Its kinetic and potential energies are, respectively-                                                                                                                                 [NEET 2019] A)  3.4 eV, - 6.8 eV done clear B)       3.4 eV, 3.4 eV done clear C)  - 3.4 eV, - 3.4 eV done clear D)      - 3.4 eV, - 6.8 eV done clear View Answer play_arrow question_answer41) For which one of the following, Bohr model is not valid ?                                         [NEET 2020] A)  Singly ionised helium atom \[\left( H{{e}^{+}} \right)\] done clear B)  Deuteron atom done clear C)  Singly ionised neon atom \[\left( N{{e}^{+}} \right)\] done clear D)  Hydrogen atom done clear View Answer play_arrow Study Package NEET PYQ-Atomic Physics   Buy Now     Please Wait you are being redirected.... You need to login to perform this action. You will be redirected in 3 sec × Reset Password. 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