Buna-S is a ________ material?

Main constituents of natural rubber is________?

Calorific value of bituminous coal may be around ________ Kcal/kg?

Pick out the wrong statement about the machinability of metals. Machinability of a metal?

In natural gas, the C/H ratio (by weight) varies in the range of________?

A fluid is termed as the Newtonian fluid, when the shear stress is ________ the velocity gradient?