1. Which of the following atmospheric layers is responsible for the deflection of radio waves?
2. Which waves cannot be transmitted through vacuum?
3. Long radio waves are reflected by which of the following layer of Eart's surface?
4. Wireless communication is reflected back to the Earth's surface by the
5. What is the distance between two succesive crestsw or successive troughs called?
6. Which of the following is a mechanical wave?
7. A rader which detects the presence of an enemy aircraft uses
8. Which one of the following types of waves are used in a Night Vision appartaus?
9. Waves used for telecommunication are
10. Following rays are used in the diagnosis of intestinal diseases
