MCQ 11 MarkNature of electromagnetic waves is :✓TransverseBLongitudinalCBoth transverse and longitudinalDMechanicalAnswerCorrect option: A. TransverseAView full question & answer→
MCQ 21 MarkWhich of the following is not electromagnetic wave ?ALight wavesBX-rays✓Sound wavesDInfrared raysAnswerCorrect option: C. Sound wavesCView full question & answer→
MCQ 31 MarkThe energy of an electromagnetic radiation is 13.2 keV. The radiation is related to which region of spectrum ?AVisible✓X-raysCUltra-violetDInfraredAnswerCorrect option: B. X-raysBView full question & answer→
MCQ 41 MarkThe unit of the ratio of magnetic field B and electric field E i.e., $(B/E)$ is :A$ms^{-1}$✓$sm^{-1}$CmsD$ms^{-2}$AnswerCorrect option: B. $sm^{-1}$B[Hint : $E / B =c \Rightarrow B / E =c^{-1}$ ]View full question & answer→
MCQ 51 MarkThe direction of propagation of electromagnetic wave is :Aparallel to $\vec{E}$Bparallel to $\vec{B}$Cparallel to $\vec{B}\times\vec{E}$✓parallel to $\vec{E}\times\vec{B}$AnswerCorrect option: D. parallel to $\vec{E}\times\vec{B}$DView full question & answer→
MCQ 61 MarkX-rays are :Atravelling electronBtravelling positive particlesCtravelling negative ions✓electromagnetic wavesAnswerCorrect option: D. electromagnetic wavesDView full question & answer→
MCQ 71 MarkWhen X-rays, Y-rays and microwaves travel in vacuum, their :Awavelength is equal but speed is unequalBfrequency is equal but speed is unequal✓speed is equal but wavelength is unequalDspeed is equal and frequency is also equalAnswerCorrect option: C. speed is equal but wavelength is unequalCView full question & answer→
MCQ 81 MarkValue of $(\mu_{0}\in_{0})^{-1/2}$ is :A$3\times10^{7}m/s$✓$3\times10^{8}m/s$C$3\times10^{9}m/s$D$3\times10^{10}m/s$AnswerCorrect option: B. $3\times10^{8}m/s$BView full question & answer→
MCQ 91 MarkThe electromagnetic wave of highest frequency is :Aultraviolet rays✓gamma raysCvisible light wavesDradio wavesAnswerCorrect option: B. gamma raysBView full question & answer→
MCQ 101 MarkWhich of the following electromagnetic waves has the longest wavelength ?AX-raysBultraviolet raysCinfrared rays✓microwavesAnswerCorrect option: D. microwavesDView full question & answer→
MCQ 111 MarkVelocity of which of the following in vaccum is $3 \times 10^{8} m/s$ ?AMicrowavesBUltraviolet wavesCInfrared waves✓All of these wavesAnswerCorrect option: D. All of these wavesDView full question & answer→
MCQ 121 MarkLight is a electromagnetic wave. It was established by :AFaradayBMichelson✓MaxwellDGaussAnswerCorrect option: C. MaxwellCView full question & answer→
MCQ 131 MarkIn a plane electromagnetic wave the phase difference between electric and magnetic field vectors is :A$60^{\circ}$B$90^{\circ}$C$120^{\circ}$✓$40^{\circ}$AnswerCorrect option: D. $40^{\circ}$DView full question & answer→
MCQ 141 MarkElectromagentic waves were produced in laboratory first by:AMaxwellBFaradayCAmpere✓HertzAnswerCorrect option: D. HertzDView full question & answer→