Eclipses occur due to which optical phenomena
1). Reflection
2). Refraction
3). Rectilinear propagation
4). Diffraction
1. The surface tension of water on adding detergent to it
3. When the main switch of the house is put off it disconnects the
5. Sending a frame to a group of stations is known as
7. Contact force is another name for ________
8. What is the SI unit of Power?