Unit 20: Electromagnetic Waves

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1. Which electromagnetic waves are used in satellite communication?

A Ultraviolet rays

B Microwaves

C X-rays

D Gamma rays

2. Which electromagnetic waves are used in TV and radio broadcasting?

A Infrared waves

B Radio waves

C X-rays

D Ultraviolet rays

3. Which radiation is most harmful to the human body?

A Radio waves

B Microwaves

C Gamma rays

D Infrared rays

4. Which electromagnetic waves are used in radar systems?

A Radio waves

B Microwaves

C Infrared rays

D X-rays

5. Which factor increases the risk of electromagnetic radiation?

A Low frequency

B Short wavelength

C Low energy

D Long wavelength

6. Microwaves are commonly used for

A Cooking food

B Medical imaging

C Sterilization

D Photography

7. Which electromagnetic waves are used for sterilizing medical equipment?

A Infrared rays

B Ultraviolet rays

C Microwaves

D Radio waves

8. X-rays are mainly used for

A Cooking

B Communication

C Medical diagnosis

D Heating

9. Which radiation is responsible for sunburn?

A Infrared

B Ultraviolet

C X-rays

D Gamma rays

10. Why clouds appear white?

A Due to absorption

B Due to reflection of blue light

C Due to scattering of all wavelengths

D Due to refraction

Unit 20: Electromagnetic Waves

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