Electromagnetic Waves · JEE Main previous year questions

2022 3 questions

1. Q452022 · 29 Jul 2022 · Shift 1

   Match List - I with List - II : $$\begin{array}{llll}& \text{List - I}& & \text{List - II}\\ \text{(a)}& \text{UV rays}& \text{(i)}& \text{Diagnostic tool in medicine}\\ \text{(b)}& \text{X-rays}& \text{(ii)}& \text{Water purification}\\ \text{(c)}& \text{Microwave}& \text{(iii)}& \text{Communication, Radar}\\ \text{(d)}& \text{Infrared wave}& \text{(iv)}& \text{Improving visibility in foggy days}\end{array}$$ Choose the correct answer from the options given below :

   1. A.(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
   2. B.(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
   3. C.(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
   4. D.(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)
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   Answer: B

2. Q422022 · 27 Jun 2022 · Shift 1

   Match List-I with List-II : $$\begin{array}{llll}& \text{List - I}& & \text{List - II}\\ \text{(a)}& \text{Ultraviolet rays}& \text{(i)}& \text{Study crystal structure}\\ \text{(b)}& \text{Microwaves}& \text{(ii)}& \text{Greenhouse effect}\\ \text{(c)}& \text{Infrared rays}& \text{(iii)}& \text{Sterilizing surgical instrument}\\ \text{(d)}& \text{X-rays}& \text{(iv)}& \text{Radar system}\end{array}$$ Choose the correct answer from the options given below :

   1. A.(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
   2. B.(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)
   3. C.(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
   4. D.(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
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   Answer: A

3. Q452022 · 26 Jun 2022 · Shift 1

   In free space, an electromagnetic wave of 3 GHz frequency strikes over the edge of an object of size $\frac{\lambda }{100}$, where $\lambda$ is the wavelength of the wave in free space. The phenomenon, which happens there will be :

   1. A.Reflection
   2. B.Refraction
   3. C.Diffraction
   4. D.Scattering
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   Answer: D