Question

Define catenation.

2. How does valency of an element vary across a period?

3. Answer question numbers 3(a) - 3(d) on the basis of your understanding of the following paragraph and the related studied concepts.


Renewable energy sources such as wind energy are vital for the Indian economy, not only from the point of view of supply, but also from the perspective of environmental and social benefits. India is the world’s fifth largest wind-power producer and the largest windmill facilities in India are installed in Tamil Nadu. Muppandal is a small village of Tamil Nadu and one of the most important sites of wind-farm in the state. It uses wind from the Arabian Sea to produce renewable energy. The suitability of Muppandal as a site for wind farms stems from its geographical location as it has access to the seasonal monsoon winds.


सीबीएसई कक्षा 10 विज्ञान नमूना प्रश्न पत्र 2020 अंकन योजना के साथ

The electrical generators used on wind turbines in sites like Muppandal, produce an output AC of 240 V and a frequency of 50 Hz even when the wind speed is fluctuating. A transformer may be required to increase or decrease the voltage so it is compatible with the end usage, distribution or transmission voltage, depending on the type of interconnection.

3 (a) State the principle behind electric generator.

3 (b) The output frequency of wind turbine is 50 Hz. What is meant by this statement?

Answer 1

Answer:

1. It is the unique ability of carbon to form bonds with other atoms of carbon giving rise to large molecules. This property is called as catenation

2. First the valency increases then decreases

3a). Electro Magnetic induction

3b). It means that the DC current which is produced is of 50Hz

Answer 2

Answer:

the process of bonding of carbon carbon compound is called catenation