What is the 5 R principle?

What is the principle of commensalism?

What is the principle applied in EcoSan?

What is the principle of reverse osmosis?

What is a stethescope? What is the principle on which it works?

a. What is the principle used in optical fibres ? b. Explain briefly the working principle. c. What are the uses of optical fibres ?

What is the principle behind starch test?

What is the principle used in atom bomb?