Solar Energy

Q. State true or false.
We know that fossil fuels are formed from decayed plants and animals that have been converted to crude oil, coal, natural gas by exposure to heat and pressure in the earth's crust over millions of years. Since fossil fuels cannot be replenished by natural means at the same rate that it is consumed, they are known as non-renewable sources of energy.

1. True
2. False

Q.

What is the age of the sun?

Q. How electricity is generated in solar panels ?

Q.

Which radiations of sunlight are used in heating a solar cooker?

Q.

In which of the following equipment do we use solar cells?

1. Traffic signals

2. Calculators

3. Artificial satellite

4. All of the above

Q.

Explain how to use solar cooker?

Q.

We generate energy from the wind using windmill. What is the ultimate source of that energy?

Q.

What is the full form of LED ? Why are LED bulbs considered energy efficient? Now explain why LED bulbs are preferred over filament bulbs.
[5 MARKS]

Q. The Earth receives heat from the Sun through the process of_______.

1. Conduction
2. Convection
3. Radiation
4. Evaporation

Q.

In a solar panel, the metal used as the main ingredient is ___.

Q.

The inside surface of a solar cooker is painted ____.

1. Yellow

2. Green

3. Black

4. Blue

Q.

The Sun is made up of 70% __________, 28% of _______ and 2% of heavier elements.

Q.

Which elements are used in the manufacturing of solar cells?

1. silicon

2. Silver

3. Gold

4. Zinc

Q. Water is the ultimate source of energy.

1. True
2. False