Question

The following table presents the part of the electromagnetic spectrum and their corresponding major applications. Match the following and choose the correct option. \[ \begin{array}{|c|c|c|c|} \hline \text{Part of Spectrum} & & \text{Applications} & \\ \hline P & \text{Microwave} & I & \text{For purifying water} \\ \hline Q & \text{UV rays} & II & \text{For warming food} \\ \hline R & \text{Gamma rays} & III & \text{For AM and FM communication systems} \\ \hline S & \text{Radio waves} & IV & \text{Cancer cells treatment} \\ \hline \end{array} \]

• A. P-II, Q-IV, R-III, S-I
• B. P-I, Q-II, R-III, S-IV
• C. P-I, Q-IV, R-II, S-III
• D. P-II, Q-I, R-IV, S-III

Hint:

Microwaves → Cooking UV rays → Water purification Gamma rays → Cancer treatment Radio waves → Communication These are among the most frequently asked electromagnetic spectrum applications in competitive examinations.

Answer 1

The Correct Option is D

Concept: Different regions of the electromagnetic spectrum possess different wavelengths, frequencies and energies. Hence, each region has specific practical applications.

Step 1: Identify the application of microwaves
Microwaves are strongly absorbed by water molecules. Therefore they are used in \[ \boxed{\text{Heating and warming food}} \] Hence, \[ P \rightarrow II \]

Step 2: Identify the application of ultraviolet rays
Ultraviolet radiation possesses sufficient energy to destroy microorganisms. Therefore UV rays are used for \[ \boxed{\text{Purifying water}} \] Hence, \[ Q \rightarrow I \]

Step 3: Identify the application of gamma rays
Gamma rays have extremely high frequency and energy. They are used in radiotherapy for destroying cancerous cells. Therefore, \[ R \rightarrow IV \]

Step 4: Identify the application of radio waves
Radio waves are used in communication systems. AM and FM broadcasting operate using radio waves. Hence, \[ S \rightarrow III \]

Step 5: Write the final matching
\[ P-II,\quad Q-I,\quad R-IV,\quad S-III \] Therefore, \[ \boxed{\text{Option (D)}} \]