Total Questions: 2
Q Range of the gravitational force is :
The gravitational force is a long-range force that acts between any two objects having mass.
Unlike forces like the nuclear force (which acts at subatomic distances), gravity:
Never becomes zero
Acts over any distance, no matter how large
Gets weaker with distance, but never fully disappears
That’s why we say its range is infinite.
Q Lichens are very good pollution indicators. They are made up of :
🔍Explanation:
A lichen is a symbiotic relationship between an alga (phycobiont) and a fungus (mycobiont), making them a good indicator of pollution as they are sensitive to air quality, particularly sulfur dioxide levels.Â