{"id":19055,"date":"2021-02-19T10:44:49","date_gmt":"2021-02-19T05:14:49","guid":{"rendered":"https:\/\/ncertsolutions.guru\/?p=19055"},"modified":"2021-02-19T10:45:48","modified_gmt":"2021-02-19T05:15:48","slug":"mcq-questions-for-class-12-physics-chapter-8","status":"publish","type":"post","link":"https:\/\/ncertsolutions.guru\/mcq-questions-for-class-12-physics-chapter-8\/","title":{"rendered":"MCQ Questions for Class 12 Physics Chapter 8 Electromagnetic Waves with Answers"},"content":{"rendered":"

Students are advised to practice the NCERT MCQ Questions for Class 12 Physics Chapter 8 Electromagnetic Waves 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 Electromagnetic Waves Class 12 MCQs Questions with Answers and assess their preparation level.<\/p>\n

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

Solving the Electromagnetic Waves Multiple Choice Questions of Class 12 Physics Chapter 8 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Electromagnetic Waves 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 8 Physics Class 12 and cross-check your answers during preparation.<\/p>\n

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

Question 1.
\nIf \\(\\vec {E}\\) and \\(\\vec {B}\\) represent electric and magnetic field vectors of the electromagnetic wave, the direction of propagation of electromagnetic wave is along
\n(a) \\(\\vec {E}\\)
\n(b) \\(\\vec {B}\\)
\n(c) \\(\\vec {B}\\) \u00d7 \\(\\vec {E}\\)
\n(d) \\(\\vec {E}\\) \u00d7 \\(\\vec {B}\\)<\/p>\n

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

Answer: (d) \\(\\vec {E}\\) \u00d7 \\(\\vec {B}\\)<\/p>\n<\/details>\n

\n

Question 2.
\nThe ratio of contributions made by the electric field and magnetic field components to the intensity of an EM wave is
\n(a) c : 1
\n(b) c\u00b2 : 1
\n(c) 1 : 1
\n(d) \u221ac : 1<\/p>\n

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

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

\n

Question 3.
\nA charged particle oscillates about its mean equilibrium position with a frequency of 109<\/sup> Hz. The electromagnetic waves produced will not
\n(a) have a frequency of 109<\/sup> Hz.
\n(b) have a frequency of 2 \u00d7 109<\/sup> Hz.
\n(c) have a wavelength of 0.3 m.
\n(d) fall in the region of radio waves.<\/p>\n

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

Answer: (b) have a frequency of 2 \u00d7 109<\/sup> Hz.<\/p>\n<\/details>\n

\n

Question 4.
\nThe source of electromagnetic waves can be a charge
\n(a) moving with a constant velocity.
\n(b) moving in a circular orbit.
\n(c) at rest.
\n(d) none of these.<\/p>\n

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

Answer: (b) moving in a circular orbit.<\/p>\n<\/details>\n

\n

Question 5.
\nA plane electromagnetic wave of frequency 25 MHz travels in free space along the x-direction. At a particular point in space and time, the electric vector is \\(\\vec {E}\\) = 6.3 Vm-1<\/sup>\\(\\hat {j}\\). Calculate \\(\\vec {B}\\) at
\nthis point.
\n(a) 2.1 \u00d7 10-8<\/sup> T
\n(b) 1.2 \u00d7 10-8<\/sup> T
\n(c) 1.9 \u00d7 10-8<\/sup> T
\n(d) 0.21 \u00d7 10-8<\/sup>T<\/p>\n

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

Answer: (a) 2.1 \u00d7 10-8<\/sup> T<\/p>\n<\/details>\n

\n

Question 6.
\nWhat physical quantity is the same for X-rays of wavelength 10-10<\/sup> m, red light of wavelength 680 nm and radio waves of wavelength 500 m?
\n(a) Wavelength
\n(b) Frequency
\n(c) Speed
\n(d) None of these.<\/p>\n

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

Answer: (c) Speed<\/p>\n<\/details>\n

\n

Question 7.
\nIn an electromagnetic wave in free space, the root mean square value of the electric field is Erms<\/sub> = 6 V m-1<\/sup>. The peak value of the magnetic field is:
\n(a) 2.83 \u00d7 10-8<\/sup> T
\n(b) 0.70 \u00d7 10-8<\/sup> T
\n(c) 4.23 \u00d7 10-8<\/sup> T
\n(d) 1.41 \u00d7 10-8 <\/sup>T<\/p>\n

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

Answer: (a) 2.83 \u00d7 10-8<\/sup> T<\/p>\n<\/details>\n

\n

Question 8.
\nArrange the following electromagnetic radiations per quantum in the order of increasing energy:
\n(A) Blue light
\n(B) Yellow light
\n(C) X-ray
\n(D) Radio wave
\n(a) A, B, C, D
\n(b) C, A, B, D
\n(c) B, A, D, C
\n(d) D, B, A, C<\/p>\n

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

Answer: (d) D, B, A, C<\/p>\n<\/details>\n

\n

Question 9.
\nA radiation of energy \u2018E\u2019 falls normally on a perfectly reflecting surface. The momentum transferred to the surface is (c = Velocity of light)
\n(a) 2E\/c
\n(b) 2E\/c\u00b2
\n(c) E\/c\u00b2
\n(d) E\/c<\/p>\n

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

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

\n

Question 10.
\nMatch List -I (Electromagnetic wave type) with List – II (Its association\/application) and select the correct option from the choices given below the lists:<\/p>\n\n\n\n\n\n\n\n
List I<\/td>\nList II<\/td>\n<\/tr>\n
(A) Infrared<\/td>\n(i) To treat muscular strain<\/td>\n<\/tr>\n
(B) Radio waves<\/td>\n(ii) For broadcasting<\/td>\n<\/tr>\n
(C) X-rays<\/td>\n(iii) To detect fracture in bones<\/td>\n<\/tr>\n
(D) Ultraviolet rays<\/td>\n(iv) Absorbed by the ozone layer of the atmosphere<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

(a) A-iii, B-ii, C-i, D-iv
\n(b) A-i, B-ii, C-iii, D-iv
\n(c) A-iv, B-iii, C-ii, D-i
\n(d) A-i, B-ii, C-iv, D-iii<\/p>\n

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

Answer: (b) A-i, B-ii, C-iii, D-iv<\/p>\n<\/details>\n

\n

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

Question 1.
\nThe conduction current is same as …………………. whether the source is ac or dc.<\/p>\n

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

Answer: Displacement current<\/p>\n<\/details>\n

\n

Question 2.
\nThe current that flows inside a capacitor is ………………. current.<\/p>\n

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

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

\n

Question 3.
\nAn oscillating charge particle radiates ……………….<\/p>\n

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

Answer: EM wave<\/p>\n<\/details>\n

\n

Question 4.
\nEM waves are …………….. in nature.<\/p>\n

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

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

\n

Question 5.
\nEM waves travel with a speed …………………<\/p>\n

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

Answer: 3 \u00d7 108<\/sup> m s-1<\/sup><\/p>\n<\/details>\n

\n

Question 6.
\nHuman body radiates ………………… of EM spectrum.<\/p>\n

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

Answer: IR radiation<\/p>\n<\/details>\n

\n

Question 7.
\nEM waves transport both ………………… and ………………..<\/p>\n

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

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

\n

Question 8.
\nEM waves are produced by ………………… charsed particles.<\/p>\n

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

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

\n

Question 9.
\nIn terms of permittivity (\u03b50<\/sub>) of free space and permeability (\u00b50<\/sub>) of free space the velocity of EM wave is ………………..<\/p>\n

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

Answer: c = \\(\\frac { 1 }{\\sqrt{\u00b5_0\u03b5_0}}\\)<\/p>\n<\/details>\n

\n

Question 10.
\nThe ratio of velocities of light waves of wavelengths 400 nm and 800 nm in vacuum is ………………..<\/p>\n

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

Answer: 1 : 1<\/p>\n<\/details>\n

\n

Question 11.
\nFor an EM wave the electric field along the X-axis is given by Ex<\/sub> = E0<\/sub> sin (kz – \u03c9t) then magnetic field is given by ……………….<\/p>\n

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

Answer: By<\/sub> = B0<\/sub> sin (kz – \u03c9t)<\/p>\n<\/details>\n

\n

Question 12.
\nThe maximum value of electric field (E0<\/sub>) and maximum value of magnetic field (B0<\/sub>) in EM wave are related as ………………<\/p>\n

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

Answer: c = E0<\/sub>\/B0<\/sub><\/p>\n<\/details>\n

\n

Question 13.
\nThe energy of EM wave is divided …………….. amongst the electric and the magnetic field.<\/p>\n

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

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

\n

Question 14.
\nShorter the wavelength of an electromagnetic wave ………………….. energy it carries.<\/p>\n

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

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

\n

Question 15.
\nThe orderly distribution of electromagnetic radiations according to their frequency or wavelength is termed as ……………….. spectrum.<\/p>\n

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

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

\n

Question 16.
\n………………. are used as a diagnostic tool.<\/p>\n

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

Answer: X-rays<\/p>\n<\/details>\n

\n

Question 17.
\nFor Sterilisation ……………….. rays are used.<\/p>\n

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

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

\n

Question 18.
\nFor looking through haze ………………… are used.<\/p>\n

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

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

\n

Question 19.
\n………………. are used for cooking.<\/p>\n

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

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

\n

Question 20.
\nWaves used to transmit cellular telephone message are ………………..<\/p>\n

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

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

\n

Question 21.
\nTo study structure of crystals ……………….. are used.<\/p>\n

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

Answer: X-rays<\/p>\n<\/details>\n

\n

Question 22.
\nHuman eye can detect ……………….. part of electromagnetic spectrum.<\/p>\n

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

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

\n

Question 23.
\nTo treat cancer and tumour in radiography ………………… rays are used.<\/p>\n

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

Answer: y-rays<\/p>\n<\/details>\n

\n

Question 24.
\nDuring the propagation of an EM wave in a medium electrical energy density is ………………….. to magnetic energy density.<\/p>\n

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

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

\n

Question 25.
\nFor an EM wave propagating along x-axis Emax<\/sub> = 30 Vm-1<\/sup>, the maximum value of magnetic field is ………………..<\/p>\n

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

Answer: 10-7<\/sup>T<\/p>\n<\/details>\n

\n

Hope the information shared regarding the NCERT MCQ Questions for Class 12 Physics Chapter 8 Electromagnetic Waves 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 Electromagnetic Waves 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 8 Electromagnetic Waves 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 Electromagnetic Waves Class 12 MCQs Questions with Answers and assess …<\/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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