How Crucial Is Air and Water

Q.

What is CNG? What are its uses?

Q. Question 20
Why is the use of diesel and petrol as fuels in automobiles being replaced by Compressed Natural Gas (CNG) in big cities?

Q. Which of the following best describes "jet streams"?

1. reversal of wind direction.
2. Wind blowing from sub-tropical high pressure belts towards the tropical low pressure belts.
3. Wind blowing from the tropical pressure belts towards the equatorial low pressure belts.
4. Narrow meandering bands of winds which blow in mid latitude near the tropopause and encricle the globe.