{"id":19070,"date":"2021-02-19T15:54:11","date_gmt":"2021-02-19T10:24:11","guid":{"rendered":"https:\/\/ncertsolutions.guru\/?p=19070"},"modified":"2021-02-19T16:07:52","modified_gmt":"2021-02-19T10:37:52","slug":"mcq-questions-for-class-12-physics-chapter-11","status":"publish","type":"post","link":"https:\/\/ncertsolutions.guru\/mcq-questions-for-class-12-physics-chapter-11\/","title":{"rendered":"MCQ Questions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter with Answers"},"content":{"rendered":"

Students are advised to practice the NCERT MCQ Questions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter 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 Dual Nature of Radiation and Matter Class 12 MCQs Questions with Answers and assess their preparation level.<\/p>\n

Dual Nature of Radiation and Matter Class 12 MCQs Questions with Answers<\/h2>\n

Solving the Dual Nature of Radiation and Matter Multiple Choice Questions of Class 12 Physics Chapter 11 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Dual Nature of Radiation and Matter 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 11 Physics Class 12 and cross-check your answers during preparation.<\/p>\n

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

Question 1.
\nWhen the light of frequency 2v0<\/sub> (where v0<\/sub> is threshold frequency) is incident on a metal plate, the maximum velocity of electrons emitted is v1<\/sub>. When the frequency of the incident radiation is increased to 5v0<\/sub>, the maximum velocity of electrons emitted from the same plate is v2<\/sub>. The ratio of v1<\/sub> to v2<\/sub> is:
\n(a) 1 : 2
\n(b) 1 : 4
\n(c) 4 : 1
\n(d) 2 : 1<\/p>\n

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

Answer: (a) 1 : 2<\/p>\n<\/details>\n

\n

Question 2.
\nThe wavelength of a photon needed to remove a proton from a nucleus which is bound to the nucleus with 1 MeV energy is nearly
\n(a) 1.2 nm
\n(b) 1.2 \u00d7 10-3<\/sup> nm
\n(c) 1.2 \u00d7 10-6<\/sup> nm
\n(d) 1.2 \u00d7 101<\/sup> nm<\/p>\n

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

Answer: (b) 1.2 \u00d7 10-3<\/sup> nm<\/p>\n<\/details>\n

\n

Question 3.
\nA proton, a neutron, an electron and an a-particle have same energy. Then their de-Broglie wavelengths compare as
\n(a) \u03bbp<\/sub> = \u03bbn<\/sub> > \u03bbe<\/sub> > \u03bba<\/sub>
\n(b) \u03bb\u03b1<\/sub> < \u03bbp<\/sub> = \u03bbn<\/sub> > \u03bbe<\/sub>
\n(c) \u03bbe<\/sub> < \u03bbp<\/sub> = \u03bbn<\/sub> > \u03bba<\/sub>
\n(d) \u03bbe<\/sub> = \u03bbp<\/sub> = \u03bbn<\/sub> = \u03bba<\/sub><\/p>\n

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

Answer: (b) \u03bb\u03b1<\/sub> < \u03bbp<\/sub> = \u03bbn<\/sub> > \u03bbe<\/sub><\/p>\n<\/details>\n

\n

Question 4.
\nThe photoelectric threshold wavelength of silver is 3250 \u00d7 10-10<\/sup> m. The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength 2536 \u00d7 10-10<\/sup> m is:
\n(Given h = 4.14 \u00d7 10-15<\/sup> eVs and c = 3 \u00d7 108<\/sup> m s-1<\/sup>)
\n(a) = 0.6 \u00d7 105<\/sup> m s-1<\/sup>
\n(b) = 61 \u00d7 10\u00b3 m s-1<\/sup>
\n(c) = 0.3 \u00d7 106<\/sup> m s-1<\/sup>
\n(d) = 6 \u00d7 105<\/sup> m s-1<\/sup><\/p>\n

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

Answer: (d) = 6 \u00d7 105<\/sup> m s-1<\/sup><\/p>\n<\/details>\n

\n

Question 5.
\nAn electron beam is accelerated by a potential difference V to hit a metallic target to produce X-rays. It produces continuous as well as characteristic X-rays. If \u03bbmin<\/sub> is the smallest possible wavelength of X-ray in the spectrum, the variation of log \u03bbmin<\/sub> with log V is correctly represented in:
\n\"MCQ<\/p>\n

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

Answer:
\n\"MCQ<\/p>\n<\/details>\n

\n

Question 6.
\nPhotons with energy 5 eV are incident on a cathode C in a photoelectric cell. The maximum energy of emitted photoelectrons is 2 eV. When photons of energy 6 eV are incident on C, no photoelectrons will reach the anode A, if the stopping potential of A relative to C is
\n(a) – 1 V
\n(b) – 3 V
\n(b) + 3 V
\n(d) + 4 V<\/p>\n

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

Answer: (b) – 3 V<\/p>\n<\/details>\n

\n

Question 7.
\nA particle is dropped from a height H. The de-Broglie wavelength of the particle as a function of height is proportional to
\n(a) H
\n(b) H1\/2<\/sup>
\n(c) H\u00b0
\n(d) H-1\/2<\/sup><\/p>\n

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

Answer: (d) H-1\/2<\/sup><\/p>\n<\/details>\n

\n

Question 8.
\nAn electron is moving with an initial velocity \\(\\vec {v}\\) = v0<\/sub>\\(\\hat {j}\\) and is in a magnetic field
\n\\(\\vec {B}\\) = B0<\/sub>\\(\\hat {j}\\). Then its de-Broglie wavelength
\n(a) remains constant
\n(b) increases with time
\n(c) decreases with time
\n(d) increases and decreases periodically<\/p>\n

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

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

\n

Question 9.
\nAn electron (mass m) with an initial velocity \\(\\vec {v}\\) = v0<\/sub>\\(\\hat {j}\\) is in an electric field
\n\\(\\vec {E}\\) = E0<\/sub>\\(\\hat {j}\\). If \u03bb0<\/sub> = \\(\\frac { h }{mv_0}\\), its de-Broglie wavelength at time t is given by
\n(a) \u03bb0<\/sub>
\n(b) \u03bb0<\/sub> \\(\\sqrt{1+\\left(\\frac{e E_{0} t}{m v_{0}}\\right)^{0}}\\)
\n(c) \\(\\frac{\\lambda_{0}}{\\sqrt{1+\\left(\\frac{e E_{0} t^{t}}{m v_{0}}\\right)^{2}}}\\)
\n(d) \\(\\frac{\\lambda_{0}}{1+\\left(\\frac{e E_{0} t}{m v_{0}}\\right)^{2}}\\)<\/p>\n

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

Answer: (c) \\(\\frac{\\lambda_{0}}{\\sqrt{1+\\left(\\frac{e E_{0} t^{t}}{m v_{0}}\\right)^{2}}}\\)<\/p>\n<\/details>\n

\n

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

Question 1.
\n……………… is the phenomenon of the emission of electrons from a metal surface when radiation of suitable frequency falls on the metal surface.<\/p>\n

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

Answer: Photoelectric effect<\/p>\n<\/details>\n

\n

Question 2.
\nThe phenomenon of emission of electrons from a hot metal surface is called ………………<\/p>\n

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

Answer: Thermionic emission<\/p>\n<\/details>\n

\n

Question 3.
\nThe minimum energy required by a free electron to just escape from the metal surface is called ………………<\/p>\n

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

Answer: Work function<\/p>\n<\/details>\n

\n

Question 4.
\nThis unit of energy commonly used in atomic and nuclear physics is ………………<\/p>\n

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

Answer: Electron volt (eV)<\/p>\n<\/details>\n

\n

Question 5.
\nThe work function (\u00d80<\/sub>) depends on the properties of the metal and the ……………… of its surface.<\/p>\n

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

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

\n

Question 6.
\n……………… is defined as the energy acquired by an electron when it is accelerated through a potential difference of 1 volt.<\/p>\n

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

Answer: Electron volt<\/p>\n<\/details>\n

\n

Question 7.
\nThe energy of the photon is given by ………………<\/p>\n

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

Answer: E = hv = \\(\\frac { hc }{\u03bb}\\).<\/p>\n<\/details>\n

\n

Question 8.
\nThe velocity of photon in different media is ………………<\/p>\n

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

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

\n

Question 9.
\nThe rest mass of a photon is ………………<\/p>\n

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

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

\n

Question 10.
\nIn a photon-particle collision (such as photon-electron collision), the total ……………… and total momentum are conserved.<\/p>\n

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

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

\n

Question 11.
\nThe maximum kinetic energy of emitted photoelectrons depends on the ……………… of incident radiation and the nature of material.<\/p>\n

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

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

\n

Question 12.
\nThe maximum kinetic energy of emitted photoelectrons is independent of ……………… of incident radiation.<\/p>\n

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

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

\n

Question 13.
\nThe photoelectric current of emitted photoelectrons depends on the ……………… of incident radiation.<\/p>\n

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

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

\n

Question 14.
\nThe photo-electric current of emitted photoelectrons is independent of the ……………… of incident radiation.<\/p>\n

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

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

\n

Question 15.
\nThe minimum frequency required to eject an electron from the surface of a metal surface is called ……………… frequency.<\/p>\n

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

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

\n

Question 16.
\nFor a frequency v of incident radiation, ……………… than the cut-off frequency v0<\/sub>, no photoelectric emission is possible even if the intensity is large.<\/p>\n

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

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

\n

Question 17.
\nPhotons are electrically ……………… and are not deflected by electric and magnetic fields.<\/p>\n

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

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

\n

Question 18.
\nDavison-Germer experiment verified the ……………… nature of moving electrons.<\/p>\n

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

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

\n

Question 19.
\nThe expression for de-Broglie wavelength of an electron moving under a potential difference of V volt is ………………<\/p>\n

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

Answer: \u03bb = \\(\\frac { 1.227 }{\u221aV}\\) nm<\/p>\n<\/details>\n

\n

Hope the information shared regarding the NCERT MCQ Questions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter 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 Dual Nature of Radiation and Matter 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 11 Dual Nature of Radiation and Matter 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 Dual Nature of Radiation and Matter …<\/p>\n

MCQ Questions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter with Answers<\/span> Read More »<\/a><\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[35],"tags":[],"yoast_head":"\nMCQ Questions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter with Answers - NCERT Solutions<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ncertsolutions.guru\/mcq-questions-for-class-12-physics-chapter-11\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MCQ Questions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter with Answers - NCERT Solutions\" \/>\n<meta property=\"og:description\" content=\"Students are advised to practice the NCERT MCQ Questions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter with Answers Pdf free download is available here. 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