GATE Questions

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S8 is an elemental form of sufur. In elemental form it can't be reduced or oxidized. Hence, it oxidation number is zero and thus sulfur is zerovalent here.

Chemically marble is known as Calcareous rock as it is composed of carbonate minerals like calcite or dolomite.

The flow of thermal energy due to differences in their temperatures is called Heat.

The reciprocal of a negative number is always a negative number. So that the number and its reciprocal multiply to 1. 

All real numbers except 0 have reciprocals.

Long sightedness is a common vision condition in which nearby objects are blurry.

In this situation, the person with this condition of the eye where the curvature of the cornea is flat or the axial length of the eyeball is short. When light enters the eye, it does not focus directly on the retina, but focuses beyond the retina. This causes near images to appear out of focus and blurred.

Long sightedness is also called hyperopia, and sometimes presbyopia.