{"id":19077,"date":"2021-02-19T16:26:04","date_gmt":"2021-02-19T10:56:04","guid":{"rendered":"https:\/\/ncertsolutions.guru\/?p=19077"},"modified":"2021-02-19T16:26:04","modified_gmt":"2021-02-19T10:56:04","slug":"mcq-questions-for-class-12-physics-chapter-12","status":"publish","type":"post","link":"https:\/\/ncertsolutions.guru\/mcq-questions-for-class-12-physics-chapter-12\/","title":{"rendered":"MCQ Questions for Class 12 Physics Chapter 12 Atoms with Answers"},"content":{"rendered":"

Students are advised to practice the NCERT MCQ Questions for Class 12 Physics Chapter 12 Atoms with Answers Pdf free download is available here. MCQ Questions for Class 12 Physics with Answers<\/a> are prepared as per the Latest Exam Pattern. Students can solve these Atoms Class 12 MCQs Questions with Answers and assess their preparation level.<\/p>\n

Atoms Class 12 MCQs Questions with Answers<\/h2>\n

Solving the Atoms Multiple Choice Questions of Class 12 Physics Chapter 12 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Atoms Class 12 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 12 Physics Class 12 and cross-check your answers during preparation.<\/p>\n

I. Choose the correct answer<\/span><\/p>\n

Question 1.
\nThe simple Bohr model cannot be directly applied to calculate the energy levels of an atom with many electrons. This is because
\n(a) of the electrons not being subject to a central force.
\n(b) of the electrons colliding with each other
\n(c) of screening effects
\n(d) the force between the nucleus and an electron will no longer be given by Coulomb\u2019s law.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) of the electrons not being subject to a central force.<\/p>\n<\/details>\n

\n

Question 2.
\nA set of atoms in an excited state decay.
\n(a) in general, to any of the states with lower energy.
\n(b) into a lower state only when excited by an external electric field.
\n(c) all together simultaneously into a lower state.
\n(d) to emit photons only when they collide.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) in general, to any of the states with lower energy.<\/p>\n<\/details>\n

\n

Question 3.
\nThe ground state energy of hydrogen atom is -13.6 eV. The kinetic and potential energies of the electron in this state are
\n(a) -13.6 eV, 27.2 eV
\n(b) 13.6 eV,-13.6 eV
\n(c) 13.6 eV,-27.2 eV
\n(d) 27.2 eV,-27.2 eV<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) 13.6 eV,-27.2 eV<\/p>\n<\/details>\n

\n

Question 4.
\nIf the series limit frequency of the Lyman series is vL<\/sub>, then the series limit frequency of the Pfund series is:
\n(a) 16 vL<\/sub>
\n(b) vL<\/sub>\/16
\n(c) VL<\/sub>\/25
\n(d) 25 vL<\/sub><\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) VL<\/sub>\/25<\/p>\n<\/details>\n

\n

Question 5.
\nThe ratio of kinetic energy to the total energy of an electron in a Bohr orbit of the hydrogen atom is
\n(a) 1 : 1
\n(b) 1 : -1
\n(c) 2 : -1
\n(d) 1 : -2<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) 1 : -1<\/p>\n<\/details>\n

\n

Question 6.
\nIonisation energy for hydrogen atom in the ground state is E. What is the ionisation energy of Li++<\/sup> atom in the 2nd excited state
\n(a) E
\n(b) 3E
\n(c) 6E
\n(d) 9E<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) E<\/p>\n<\/details>\n

\n

Question 7.
\nHydrogen (H\\( _{ 1 }^{1}\\)), deuterium (H\\( _{ 1 }^{2}\\)), singly ionised helium (He\\( _{ 2 }^{4}\\))+<\/sup> and doubly ionised lithium (Li\\( _{ 3 }^{6}\\))++<\/sup> all have one electron around their nucleus. Consider an electron transition from n = 2 to n = 1 if the wavelengths of the emitted radiations are \u03bb1<\/sub>, \u03bb2<\/sub>, \u03bb3<\/sub> and \u03bb4<\/sub> respectively then approximately which of the following is correct?
\n(a) 4\u03bb1<\/sub> = 2\u03bb2<\/sub> = 2\u03bb3<\/sub> = \u03bb4<\/sub>
\n(b) \u03bb1<\/sub> = 2\u03bb2<\/sub> = 2\u03bb3<\/sub> = \u03bb4<\/sub>
\n(c) \u03bb1<\/sub> = \u03bb2<\/sub> = 4\u03bb3<\/sub> = 9\u03bb4<\/sub>
\n(d) \u03bb1<\/sub> = 2\u03bb2<\/sub> = 3\u03bb3<\/sub> = 4\u03bb4<\/sub><\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) \u03bb1<\/sub> = \u03bb2<\/sub> = 4\u03bb3<\/sub> = 9\u03bb4<\/sub><\/p>\n<\/details>\n

\n

Question 8.
\nAs an electron makes a transition from an excited state to the ground state of a hydrogen like atom\/ion:
\n(a) its kinetic energy increases but potential energy and total energy decrease
\n(b) kinetic energy, potential energy and total energy decrease
\n(c) kinetic energy decreases, potential energy increases but total energy remains the same
\n(d) kinetic energy and total energy decrease but potential energy increases<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) its kinetic energy increases but potential energy and total energy decrease<\/p>\n<\/details>\n

\n

Question 9.
\nAn electron from various excited states of hydrogen atom emits radiation to come to the ground state. Let \u03bbn<\/sub>, \u03bbg<\/sub> be the de-Broglie wavelength of the electron in the nth state and the ground state respectively. Let \u2227n<\/sub> be the wavelength of the emitted photon in the transition from the nth state to the ground state. For large n (A, B are constants)
\n(a) \u2227n<\/sub> = A + B\u03bbn<\/sub>
\n(b) \u2227n<\/sub> = A + B\u03bb\\(_{ n }^{2}\\)
\n(c) \u2227\\(_{ n }^{2}\\) = X
\n(d) \u2227n<\/sub> = A + \\(\\frac { B }{\u03bb_n^2}\\)<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) \u2227n<\/sub> = A + \\(\\frac { B }{\u03bb_n^2}\\)<\/p>\n<\/details>\n

\n

II. Fill in the blanks<\/span><\/p>\n

Question 1.
\nThe a-scattering experiment was performed around 1911 by ……………… and ………………<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Geiger, Marsden<\/p>\n<\/details>\n

\n

Question 2.
\nOne in ……………… \u03b1-particles retraced their path in the a scattering experiment.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: 8000<\/p>\n<\/details>\n

\n

Question 3.
\nThe angle of scattering \u03b8 for zero value of impact parameter b is ………………<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: 180\u00b0<\/p>\n<\/details>\n

\n

Question 4.
\nThe scattering angle will decrease with the ……………… in impact parameter.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Increase<\/p>\n<\/details>\n

\n

Question 5.
\nThe smallest distance between the nucleus and the alpha particle for a head-on collision towards the nucleus is called the ………………<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Distance of closest approach<\/p>\n<\/details>\n

\n

Question 6.
\nThe radius of an atom is about ……………… m and that of nucleus is ……………… m.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: 10-10<\/sup> and 10-15<\/sup><\/p>\n<\/details>\n

\n

Question 7.
\nThe Rutherford\u2019s model of an atom cannot explain the characteristics ……………… spectrum emitted by H-atom.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Line<\/p>\n<\/details>\n

\n

Question 8.
\nWhen an electron jumps from an outer stationary orbit of energy E2<\/sub> to an inner stationary orbit of energy E1<\/sub> the frequency of radiation emitted = ………………<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: v = \\(\\frac { E_2 – E_1 }{h}\\)<\/p>\n<\/details>\n

\n

Question 9.
\nIf the size of first orbit of hydrogen atom is 0.5 \u00c5, the size of second orbit of hydrogen atom would be ………………<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: 2 \u00c5<\/p>\n<\/details>\n

\n

Question 10.
\nThe frequency spectrum of radiation emitted as per Rutherford\u2019s model of atom is ………………<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Continuous<\/p>\n<\/details>\n

\n

Question 11.
\nAccording to de Broglie a stationary orbit is that which contains an ……………… number of de-Broglie waves associated with the revolting electron.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: integral<\/p>\n<\/details>\n

\n

Question 12.
\nEnergy possessed by an electron for (n \u2192 \u221e)th orbit is ………………<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Zero<\/p>\n<\/details>\n

\n

Question 13.
\nThe speed of an electron in the first orbit of hydrogen atoms is ………………<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: v = c\/137n<\/p>\n<\/details>\n

\n

Question 14.
\nThe total energy of an electron in an orbit of hydrogen atom is ……………… of the kinetic energy.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Negative<\/p>\n<\/details>\n

\n

Question 15.
\nThe potential energy of the electron in an orbit of hydrogen atom is negative of ……………… the kinetic energy.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Twice<\/p>\n<\/details>\n

\n

Question 16.
\nThe ……………… energy is the energy required to excite an electron to a higher energy level.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Excitation<\/p>\n<\/details>\n

\n

Question 17.
\nThe ……………… energy is the energy required by an electron to set itself free.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Ionisation<\/p>\n<\/details>\n

\n

Question 18.
\nEnergy possessed by an electron in the ground state of hydrogen atom is ……………… eV.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: -13.6<\/p>\n<\/details>\n

\n

Question 19.
\nTotal energy of electron in a stationary orbit is ……………… which means the electron is bound to the nucleus and is not free to leave it.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Negative<\/p>\n<\/details>\n

\n

Question 20.
\nThe value of Rydberg constant is ………………<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: 1.09 \u00d7 107<\/sup> m-1<\/sup><\/p>\n<\/details>\n

\n

Question 21.
\nWhen an electron jumps from 2nd stationary orbit of hydrogen atom to 1st stationary orbit, the energy emitted is ………………<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: 10.2 eV<\/p>\n<\/details>\n

\n

Question 22.
\n……………… series lies in the ultraviolet region.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Lyman<\/p>\n<\/details>\n

\n

Question 23.
\n……………… of hydrogen spectrum which lies in the visible region electromagnetic spectrum.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: Balmer series<\/p>\n<\/details>\n

\n

Hope the information shared regarding the NCERT MCQ Questions for Class 12 Physics Chapter 12 Atoms with Answers Pdf free download is true and genuine as far as our knowledge is concerned. If you feel any information regarding CBSE Class 12 Physics Atoms MCQs Multiple Choice Questions with Answers is missing do reach us and we will look into it and add it accordingly.<\/p>\n","protected":false},"excerpt":{"rendered":"

Students are advised to practice the NCERT MCQ Questions for Class 12 Physics Chapter 12 Atoms with Answers Pdf free download is available here. MCQ Questions for Class 12 Physics with Answers are prepared as per the Latest Exam Pattern. Students can solve these Atoms Class 12 MCQs Questions with Answers and assess their preparation …<\/p>\n

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MCQ Questions for Class 12 Physics with Answers are prepared as per the Latest Exam Pattern. 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