100+ Physics Question and Answer for Competitive Exams - 2

Question: 6

Define potential difference?

The potential difference between two points in an electric field is equal to the amount of work done in moving a unit positive charge from one point to the other against the field.

Question: 7

What is the practical unit of work?

The practical unit of work or energy is joule.

Question: 8

Define electric current?

An electric current is defined as the flow of charge from higher potential to a lower potential.

Question: 9

What is electroplating?

Electroplating is the process by which a thin coating of any desired metal can be deposited on another metallic object.

Question: 10

What is three phase?

The current produced by an A.C. generator consisting of three coils inclined at 120° to one another is called a three phase A.C.