7) If a body is stressed within its elastic limit, the lateral strain bears a constant ratio to the linear strain. This constant known as

8) If one litre of a fluid has a mass of 7.5 kg then its specific gravity iss

9) It is required to find pressure difference between two horizontal pipe through which water is flowing using inverted manometer. Two manometric fluid with specific gravities 13.6 and 0.8 and are available. Which manometric fluid is to be used now?