Question 1:
Which type of electromagnetic wave is primarily absorbed by the ozone layer in the Earth's atmosphere?
Explanation: The correct answer is C) Ultraviolet. The ozone layer in the Earth's atmosphere primarily absorbs ultraviolet (UV) waves, specifically UV-B and UV-C, preventing them from reaching the Earth's surface and protecting living organisms from harmful radiation.
Question 2:
Which type of electromagnetic wave is most easily absorbed by water molecules?
Explanation: The correct answer is B) Microwaves. Microwaves are easily absorbed by water molecules, which is why they are used in microwave ovens for heating food. The absorption of microwaves by water molecules causes them to vibrate, generating heat.
Question 3:
Which type of electromagnetic wave is used in fiber optic communication systems?
Explanation: The correct answer is C) Infrared. Infrared waves are used in fiber optic communication systems. In these systems, infrared signals are transmitted through optical fibers, which are thin strands of glass or plastic, to carry information over long distances with minimal signal loss.
Question 4:
Which type of electromagnetic wave is used in night vision devices?
Explanation: The correct answer is C) Infrared. Night vision devices use infrared waves to detect and amplify the heat emitted by objects, allowing users to see in low-light or dark environments where visible light is insufficient.
Question 5:
Which type of electromagnetic wave is used in security scanners to detect metallic objects?
Explanation: The correct answer is B) X-rays. Security scanners, such as those used in airports, utilize X-rays to detect metallic objects hidden within luggage or on a person's body. X-rays have high penetrating power and can reveal objects that may be concealed from visible light scanners.