Questions

In making jewels, gold is usually mixed with copper to make it little hard.

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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.

Jawaharlal Nehru is known as Architect of Modern India.

A transformer that increases voltage from primary to secondary (more secondary winding turns than primary winding turns) is called a Step-Up Transformer.

Conversely, a transformer designed to do just the opposite is called a Step-Down Transformer. 

Gear finishing operation is called Burnishing.

The act of formally approving something is known as Ratification.