100+ Advanced Physics Questions and Answers Pdf - 4

Question: 16

Give two applications of electromagnet?

Electromagnets are used in electric motors, telegraph instruments, loud speakers, ear phones, telephone receivers and electric bells.

Question: 17

What type of electric current is used in houses?

A.C. current is used in houses.

Question: 18

Give the uses of nitrogen?

Nitrogen is needed for plants in the form of nitrates.

It dilutes the concentration of oxygen and prevents spontaneous combustion.

It provides unreactive environment.

It is the building block of living beings.

It is necessary for the formation of proteins.

Question: 19

What are heat engines?

The engine in which heat energy are converted to mechanical energy is known as heat engine.

Question: 20

State Boyle's law?

When temperature remains constant the pressure of given mass of a gas is inversely proportional to its volume.