100+ Physics Practice Test with Answers - 3

Question: 11

Write a note on wind energy?

The uneven heating of earth's surface by the sun causes winds.

Winds are convection currents in the air.

So, wind energy us kinetic energy associated with the movements of air.

The direction and speed of wind change at different places of earth.

The speed of the wind increases in hilly areas.

The energy of moving air is the wind energy which is used to run windmills.

A number of windmills are erected over a large area, called wind energy farm.

The energy output from all windmills are coupled together to get electricity for commercial purposes.

Question: 12

What are thermal power stations?

Thermal power plants provide major share of electric energy in India and in other countries.

In these plants the heat by burning fossil fuels are used to convert the water in boilers into steam which run the generators to produce electricity.

In Tamil Nadu, thermal power stations are located at Neyveli, Ennore, North Chennai, Mettur and Tuticorin.

Question: 13

Write a note on nuclear fission and nuclear fusion?

Nuclear fission

The process of breaking up of the nucleus of a heavy atom into two or more smaller nuclei with the release of large amount of energy is known as nuclear fission. The energy produced is known as nuclear energy. The working principle of Atom Bomb is nuclear fission.

Nuclear fusion

Nuclear fusion is a process in which two or more light nuclei combine to form a heavy nucleus. The energy liberated is called thermo nuclear energy. Hydrogen bombs work by this principle of nuclear fusion.

Question: 14

What is pumped storage plant?

Pumped storage power is also a type of hydro electric power plant.

In these plants reversible turbines are used for power generation during peak hours and as pump for pumping water during peak off hours.

In Tamilnadu pumped storage power plant is located at Kadampari.