What is wind energy? How is wind energy used to produce electricity? How much electric power is generated in India using wind energy?

The gases which are good …………… of long wavelength infrared radiations are called greenhouse gases.

1. emitters
2. reflectors
3. absorbers
4. none of the above

The increase of carbon dioxide gas in atmosphere will cause —

1. decrease in temperature
2. increase in temperature
3. decrease in humidity
4. increase in humidity

Without green house effect, the average temperature of earth’s surface would have been —

1. -18°C
2. 33°C
3. 0°C
4. 15°C