Advertisements
Advertisements
प्रश्न
Give scientific reason.
Hydropower, solar energy and wind energy are called renewable energy.
Advertisements
उत्तर
- The sources of energy which are being produced continuously in nature and are inexhaustible, i.e., they are always available for use are called renewable sources of energy.
- Hydropower, solar energy, wind energy are produced from energy sources like water, sunlight and wind respectively that are produced continuously in nature and will not get depleted.
Thus, hydropower, solar energy and wind energy are called renewable energy.
APPEARS IN
संबंधित प्रश्न
What kind of mirror – concave, convex or plain – would be best suited for use in a solar cooker? Why?
What are the advantages and disadvantages of using a solar cooker? Are there places where solar cookers would have limited utility?
Name some of the solar energy devices.
What type of reflector is used in a box-type solar cooker?
What is the range of temperature which can be achieved in a box-type solar cooker in two to three hours?
Name that part of a box-type solar cooler which allow the sun's heat rays to enter the box but does not allow inside heat to go out.
Name the semi-conductor material which is usually used for making solar cells.
Write the uses of solar cells.
State the advantages and disadvantages of using solar cells.
What is solar constant? What is the value of solar constant?
If the energy received by 5 m2 area in 10 minutes is 4200 kJ, calculate the value of solar constant.
Why is the solar cooker box covered with a glass sheet?
The radiations present in sunlight which make a solar cooker work are:
(a) visible light rays
(b) ultraviolet rays
(c) comic rays
(d) infrared rays
Observe the connections of cells shown in the following images.
i. Which connection will give maximum potential difference?
ii. Give one advantage and one disadvantage of this energy.
Make a table based on forms of energy and corresponding devices:
| Forms of Energy | Devices | |
| a. | Electric | _________ |
| b. | Mechanical | Sewing machine, Bicycle |
| c. | Thermal | __________ |
| d. | _________ | Solar cooker, Solar heater |
Complete the following flow chart.

Solar energy is a non depleting energy. Justify.
Choose the correct statement.
______ is considered as a great source of energy.
