CBSE Class 10 Science 2020 · Paper 31/5/1 · Question 3
Answer question numbers 3(a) – 3(d) on the basis of your understanding of the following paragraph and the related studied concepts :
Solar power in India is a fast developing industry. The country’s solar installed capacity reached 30.071 GW as of 31 July, 2019. India has the lowest capital cost per MW to install solar power plants. Solar electricity generation recorded nearly 3.4% of total utility electricity generation in January 2019. The following table shows Annual Solar Power Generation of the last six years.
Our country is lucky to receive solar energy for the greater part of the year. It is estimated that during a year India receives the energy equivalent to more than 5000 trillion kWh from the Sun.
| Year | Solar Power Generation (TWh) |
|---|---|
| 2013 – 14 | 3.35 |
| 2014 – 15 | 4.60 |
| 2015 – 16 | 7.45 |
| 2016 – 17 | 12.09 |
| 2017 – 18 | 25.87 |
| 2018 – 19 | 39.27 |
- (a)What are solar cells ?[1]
- (b)How much voltage can be developed and how much electricity can be produced by one typical solar cell when exposed to the Sun ?[1]
- (c)The future of power generation by solar energy is bright in India. Give reason.[1]
- (d)List two advantages of solar cells.[1]
Answer
Solar cells turn sunlight directly into electricity, giving 0.5 to 1 V and about 0.7 W; India's year-round sunshine makes solar power promising.
(a) Solar cells are devices that convert solar energy (sunlight) directly into electricity (electrical energy).
(b) A typical solar cell develops a voltage of to V and can produce about W of electricity when exposed to the Sun.
(c) India receives a great amount of solar energy throughout the year (sunshine for the greater part of the year, more than trillion kWh annually), so solar electricity can be generated on a large scale for most of the year.
(d) Any two: solar cells have no moving parts; they require little maintenance; they work quite satisfactorily without any focusing device; they can be set up in remote and inaccessible areas.
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