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Target Exam

CUET

Subject

Physics

Chapter

Electromagnetic Waves

Question:

Match List - I with List - II.

List - I

List – II

 (A)

 Microwaves

 (I)

 used in cell phone communication 

 (B)

 Radiowaves 

 (II)

 used in remote sensing

 (C)

 UV rays

 (III) 

 used in aircraft navigation

 (D) 

 Infrared rays 

 (IV)

 causes tanning of skin

Choose the correct answer from the options given below :

Options:

(A)-(III), (B)-(I), (C)-(IV), (D)-(II)

(A)-(II), (B)-(I), (C)-(IV), (D)-(III)

(A)-(III), (B)-(II), (C)-(I), (D)-(IV)

(A)-(I), (B)-(III), (C)-(II), (D)-(IV)

Correct Answer:

(A)-(III), (B)-(I), (C)-(IV), (D)-(II)

Explanation:

1. Infrared remote sensing makes use of infrared sensors to detect infrared radiation emitted from the Earth's surface. The middle-wave infrared (MWIR) and long-wave infrared (LWIR) are within the thermal infrared region. These radiations are emitted from warm objects such as the Earth's surface.

2. Sunburn/Tanning is a sign of short-term overexposure, while premature aging and skin cancer are side effects of prolonged UV exposure.

3. Microwaves or short radio waves are suitable for radar systems used in aircraft navigation because of their short wavelengths. 

4. mobile uses radio waves to transmit signals to a network of base stations. 

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