Electromagnetic Waves PYQs Set 9 (PDF)

Set 9 of 9 · Questions 241-253 of 253

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Mere Teacher · Previous Year Questions JEE Main Physics · Electromagnetic Waves · Set 9 (Q241-253)
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241. $Biological importance of ozone layer is$ (1) $it stops ultraviolet rays$ (2) $ozone layer reduces green house effect$ (3) $ozone layer reflects radio waves$ (4) $ozone layer controls O_{2} / H_{2} ratio in atmosphere.$ 242. $Wavelength of light of frequency 100 Hz$ (1) $4 \times 1 0^{6} m$ (2) $3 \times 1 0^{6} m$ (3) $2 \times 1 0^{6} m$ (4) $5 \times 1 0^{- 5} m$ 243. $Match the List-I with List-II: List I (A) Microwaves (B) Gamma rays (C) Radio waves (D) X-rays List II (I) Radioactive decay of the nucleus (II) Rapid acceleration and deceleration of electron in aerials (III) Inner shell electrons (IV) Klystron valve Choose the correct answer from the options given below:$ (1) $A-I, B-II, C-III, D-IV$ (2) $A-IV, B-I, C-II, D-III$ (3) $A-I, B-III, C-IV, D-II$ (4) $A-IV, B-III, C-II, D-I$ 244. $Which of the following rays are not electromagnetic waves?$ (1) $X ‐rays$ (2) $γ ‐rays$ (3) $β ‐rays$ (4) $heat rays$ 245. $Mach List-I with List - II: List I (A) Ultraviolet rays (B) Microwaves (C) Infrared waves (D) X-rays List II (I) Study crystal structure (II) Greenhouse effect (III) Sterilizing waves surgical instrument (IV) Radar system Choose the correct answer from the options given below:$ (1) $(A) - (III), (B) - (IV), (C) - (II), (D) - (I)$ (2) $(A) - (III), (B) - (I), (C) - (II), (D) - (IV)$ (3) $(A) - (IV), (B) - (III), (C) - (II), (D) - (I)$ (4) $(A) - (III), (B) - (IV), (C) - (I), (D) - (II)$ 246. $Light of wavelength 1 nm belongs to the following class of waves$ (1) $Radio waves$ (2) $Micro waves$ (3) $x-rays$ (4) $Gamma rays$ 247. $Match List-I with List-II List I (A) Microwaves (B) UV rays (C) Infra-red rays (D) X-rays List II (I) Physiotherapy (II) Treatment of cancer (III) Lasik eye surgery (IV) Aircraft navigation Choose the correct answer from the option given below:$ (1) $A-II, B-IV, C-III, D-I$ (2) $A-IV, B-I, C-II, D-III$ (3) $A-IV, B-III, C-I, D-II$ (4) $A-III, B-II, C-I, D-IV$ 248. $In a plane electromagnetic wave, U_{E} and U_{B} are average energy densities of electric field and magnetic field respectively, then the correct option in the following is$ (1) $U_{E} = U_{B} 2$ (2) $U_{E} = 2 U_{B}$ (3) $U_{E} = U_{B}$ (4) $U_{E} \neq = U_{B}$ 249. $During the propagation of electromagnetic waves in a medium :$ (1) $Electric energy density is double of the magnetic energy density.$ (2) $Electric energy density is half of the magnetic energy density.$ (3) $Electric energy density is equal to the magnetic energy density.$ (4) $Both electric and magnetic energy densities are zero.$ 250. $A plane electromagnetic wave of frequency 25 GHz is propagating in vacuum along the z-direction. At a particular point in space and time, the magnetic field is given by B = 5 \times 1 0^{-8} j^T. The corresponding electric field E is (Speed of light c = 3 \times 1 0^{8} m s^{-1})$ (1) $1.66 \times 1 0^{-16} i^V/m$ (2) $15 i^V / m$ (3) $-15 i^V / m$ (4) $-1.66 \times 1 0^{-16} i^V / m$ 251. $Electromagnetic tadiation used 10 sterilise milk is$ (1) $X-ray$ (2) $Y-ray$ (3) $UV rays$ (4) $Radiowaves$ 252. $A plane electromagnetic wave propagating along y -direction can have the following pair of electric field (E) and magnetic field (B) components.$ (1) $E_{y}, B_{y} or E_{z}, B_{z}$ (2) $E_{y}, B_{x} or E_{x}, B_{y}$ (3) $E_{x}, B_{z} or E_{z}, B_{x}$ (4) $E_{x}, B_{y} or E_{y}, B_{x}$ 253. $Match List I with List II List-I A. Gauss’s law of magnetostatics B. Faraday’s law of electro magnetic induction C. Ampere’s law D. Gauss’s law of electrostatics List-II I . \oint E \cdot da = \frac{I}{ϵ _{0}} \int ρ dV II. \oint B \cdot da = - 0 III. \oint E \cdot dl = \frac{- d}{dt} \int B \cdot da IV \oint B \cdot d l = - μ_{0} I Choose the correct answer from the options given below:$ (1) $A-I, B-III, C-IV, D-II$ (2) $A-III, B-IV, C-I, D-II$ (3) $A-IV, B-II, C-III, D-I$ (4) $A-II, B-III, C-IV, D-I$