Which characteristic of the sound help you to identify your friend by this voice while sitting with others in a dark room.

Name the characteristics of sound which help us to distinguish different sounds.

Suppose you have two coins which appear identical in your pocket. You know that one coin is fair and the other is 2 handed. If you take out one coin, toss it and get and a head, what is the probability that it is a fair coin?

One set of a plant was grown at 12 hours day and 12 hours night preiod cycles nad it flowered while in the other set night phase was interrupted bby flash of light and it did not produce flower.Under which one of the following categories will you place this plant?