The substance added to the soil in very small amounts are called.
The substance added to the soil to provide one or more nutrient
elements essential for plants growth are called.
Which one of the following set of raw material is most suitable for
manufacture of urea.
Iron is said to be abundant in nature. About how many percent of the
earth’s crust is iron.
The special chrome steels of the stainless variety
contain how many percent of chromium.
What refers to the application of any process whereby
the surface of steel is altered so that it will become hard.
What is a process of producing a hard surface in a steel having a
sufficiently high carbon content to respond to hardening by a rapid cooling of
the surface?
What refer to the casehardening process by which the carbon content of
the steel ear the surface of a part is increased?
