Q.43 Physics ⭐ 360° Option Elimination Active

NEET 2026 Physics Question 43 Solution

Topic: Electromagnetic Waves · Official NTA Booklet Code 50

Question

The following table presents the part of the electromagnetic spectrum and their corresponding major applications. Part of the electromagnetic spectrum: P. Microwave; Q. UV rays; R. Gamma rays; S. Radio wave. Applications: I. For purifying the water; II. For warming the food; III. For AM and FM communication systems; IV. For treating the Cancer cells. The correct option is:

✓

Verified Against NTA Final Answer Key

Option (3) : P-II, Q-I, R-IV, S-III

📚 Electromagnetic Waves Easy

📋 Given Parameters & Problem Setup

Band P Microwave

Band Q UV rays

Band R Gamma rays

Band S Radio wave

Application I For purifying the water

Application II For warming the food

Application III For AM and FM communication systems

Application IV For treating the Cancer cells

⚡

The 30-Second Exam Hall Shortcut: ⚡ 1-to-1 Anchor Match Trick

⏱️ Instant matching saves 45 seconds.

Match the most obvious pair: Microwaves warm food (P -> II)!

1 P (Microwave): Used in microwave ovens for warming food ==> P must match II.

2 Look at the options: Only Options (3) and (4) start with P-II.

3 Now match Q (UV rays): UV water purifiers kill bacteria and microbes ==> Q must match I.

4 Between (3) and (4), ONLY Option (3) has Q-I! Done in 10 seconds!

🛡️

Why You Can 100% Trust This Shortcut: Every pairing is a standard canonical fact directly from NCERT Electromagnetic Waves chapter table.

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Match Microwaves (P)

Microwaves have frequencies tuned to the resonant rotational frequency of water molecules in food:

\text{Microwaves (P)} \iff \text{Warming the food (II)}

• Used universally in domestic and commercial microwave ovens.

Step 2

Match Ultraviolet Rays (Q)

UV radiation damages microbial DNA, acting as a powerful germicide:

\text{UV rays (Q)} \iff \text{Purifying water by destroying microbes (I)}

• Standard technology in domestic RO/UV water purifiers.

Step 3

Match Gamma Rays (R) and Radio Waves (S)

Evaluate the remaining two high and low frequency bands:

\text{Gamma rays (R)} \iff \text{Cancer radiotherapy (IV)}, \qquad \text{Radio waves (S)} \iff \text{AM/FM communication (III)}

• High-energy Gamma rays destroy malignant tumor cells in radiotherapy.
• Radio waves propagate over long distances for broadcast communication.

Step 4

Assemble Complete Match Code

Combine all pairings:

\text{P-II, } \text{Q-I, } \text{R-IV, } \text{S-III}

• Matches Option (3) exactly.

⭐

360° Option Elimination Engine Key Feature

Diagnose every choice: Know exactly why the right option works and why distractors fail.

4-Option Deep Scan

1 Option (1)

✗ Incorrect

Verdict & Scientific Reason:

Mismatches food warming and water purification.

⚠️

Student Fallacy (Why candidates pick this trap): Assumes microwaves purify water.

Note: Microwaves warm food (P-II).

2 Option (2)

✗ Incorrect

Verdict & Scientific Reason:

Scrambled assignments.

⚠️

Student Fallacy (Why candidates pick this trap): Assigns gamma rays to food warming.

Note: Gamma rays are used in cancer radiotherapy (R-IV).

3 Option (3)

✓ 100% Correct

Verdict & Scientific Reason:

100% textbook verified; confirmed by Official NTA Final Answer Key.

💡

Why this is airtight: Exact knowledge of NCERT EM spectrum application table.

Note: Flawless match.

4 Option (4)

✗ Incorrect

Verdict & Scientific Reason:

Assigns radio waves to water purification.

⚠️

Student Fallacy (Why candidates pick this trap): Assigns UV rays to cancer treatment.

Note: UV rays purify water (Q-I).

⚠️

NTA Trap Alert: Confusing UV Water Purification with Gamma Food Irradiation

Students sometimes confuse the germicidal applications of UV and Gamma rays.

🛡️ How to avoid the -1 mark: Remember: Water purifiers in homes specifically have "UV filters" (Q-I), while hospitals use Gamma rays for cancer treatment (R-IV).

📖

Core NEET Syllabus Standard

NEET UG Physics Core Standards · Electromagnetic Waves Standard Benchmark

Core Scientific Principle Tested:

"Microwaves: radar and ovens. UV: water purification and LASIK. Gamma rays: radiotherapy for cancer. Radio waves: radio and television transmission."

Syllabus Focus: Electromagnetic Spectrum: Frequency Bands and Applications

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

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NEET 2026 Physics Question 43 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ 1-to-1 Anchor Match Trick

Step-by-Step Rigorous Workflow & Mathematical Proof

Match Microwaves (P)

Match Ultraviolet Rays (Q)

Match Gamma Rays (R) and Radio Waves (S)

Assemble Complete Match Code

360° Option Elimination Engine Key Feature

NTA Trap Alert: Confusing UV Water Purification with Gamma Food Irradiation

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

🔗 Related Questions — Electromagnetic Waves

Relation Between Electric and Magnetic Fields in EM Waves

Spatial Distribution of Induced Magnetic Field in a Charging Capacitor

Displacement Current in a Charging Capacitor Gap

Properties of Electromagnetic Waves in Free Space

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