STD 12 - Electromagnetic waves PYQs: JEE Mains Physics – Page 4

Showing 151–161 of 161 questions

151. 151. During the propagation of electromagnetic waves in a medium 2014 Easy
152. 152. If microwaves, \(X\) rays, infrared, gamma rays, ultraviolet, radio waves and visible parts of the electromagnetic spectrum by are denoted \(M, X, I, G, U, R\) and \(V\) then which of the following is the arrangement in ascending order of wavelength ? 2014 Easy
153. 153. Match List \(- I\) (Electromagnetic wave type) with List \(- II\) (Its association/application) and select the correct option from the choices given below the lists

     લિસ્ટ\(-I\)	લિસ્ટ\(-II\)
     \(a\). Infrared waves	\(i\). To treat muscular strain
     \(b\). Radio waves	\(ii\). For broadcasting
     \(c\). \(X-\)rays	\(iii\). To detect fracture of bones
     \(d\). Ultraviolet rays	\(iv\). Absorbed by the ozone layer of the atmosphere

     \(a\)         \(b\)         \(c\)         \(d\) 2014 Medium
154. 154. Match the List \(-I\) (Phenomenon associated with electromagnetic radiation) with List \(-II\) (Part of electromagnetic spectrum) and select the correct code from the choices given below this lists

     List \(I\)	List \(II\)
     \(I\) Doublet of sodium	\((A)\) Visible radiation
     \(II\) Wavelength corresponding to temperature associated with the isotropic radiation filling all space	\((B)\) Microwave
     \(III\) Wavelength emitted by atomic hydrogen in interstellar space	\((C)\) Short radio wave
     \(IV\) Wavelength of radiation arising from two close energy levels in hydrogen	\((D)\) \(X-\) rays

     2014 Medium
155. 155. A metal sample carrying a current along \(X-\) axis with density \(J_x\) is subjected to a magnetic field \(B_z\) ( along \(z-\) axis ). The electric field \(E_y\) developed along \(Y-\) axis is directly proportional io \(J_x\) as well as \(B_z\) . The constant of proportionality has \(SI\, unit\). 2013 Medium
156. 156. A plane electromagnetic wave in a non-magnetic dielectric medium is given by \(\vec E\, = \,{\vec E_0}\,(4 \times {10^{ - 7}}\,x - 50t)\) with distance being in meter and time in seconds. The dielectric constant of the medium is 2013 Hard
157. 157. Photons of an electromagnetic radiation has an energy \(11\, keV\) each. To which region of electromagnetic spectrum does it belong ? 2013 Medium
158. 158. Select the correct statement from the following 2013 Easy
159. 159. The magnetic field in a travelling electromagnetic wave has a peak value of \(20\ n T\). The peak value of electric field strength is......\(Vm^{-1}\) 2013 Easy
160. 160. This question has Statement \(- 1\) and Statements \(- 2\). Of the four choices given after the Statements, choose the one that best describes the two Statements Statement \(-1\) : Out of radio waves and microwaves, the radio waves under go more diffraction Statement \(-2\) : Radio waves have greater frequency compared to microwaves 2013 Easy
161. 161. To establish an instantaneous current of \(2\,A\) through a \(1\,\mu F\) capacitor ; the potential difference across the capacitor plates should be changed at the rate of 2013 Medium

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