Questions

Any object rolls when there is no friction. So, Sliding to Rolling is correct.

The process by which bacteria convert nitrogen gas (N2) into ammonia (NH3) is called Nitrogen Fixation.

The conversion of nitrogen from one form to another in the nitrogen cycle is carried out primarily by Nitrogen Fixing Bacteria such as Azotobacter.

Here in the given options, Gold is a malleable substance.

Malleable substance means a metal or a material able to be hammered or pressed into shape without breaking or cracking. i.e, tensile.

Salivary glands of man are 3 pairs = 6. They are one pair of parotid glands, one pair of submaxillary or submandibular glands and one pair of sublingual glands.

Evaporation causing cooling.Here the evaporation is less. Therefore cooling is less.

An excise or excise tax or excise duty is a type of tax charged on goods produced within the country (as opposed to customs duties, charged on goods from outside the country). It is a tax on the production of a good. This tax is now known as the Central Value Added Tax (CENVAT).