You recognize your friend by hearing his voice on a telephone. Explain.

Which characteristic of the sound helps you to identify your friend by his voice while sitting with others in a dark room ?

If someone presses a pointed needle against your skin, your are hurt. But if someone presses as rod against your skin with the same force you easily tolerate. Explain

Which characteristic of sound, makes it possible to recognize a person by his voice without seeing him ?

A musician recognizes the musical instrument by hearing the sound produced by it, even without seeing the instrument. Which characteristic of sound makes this possible ?

Assertion : On moon you cannot hear your friend standing at some distance from you. Reason : There is a vacuum on moon.

You are given a red flower-bearing pea plant and a red flower-hearing snapdragon plant.How would you find the genotypes of these two plants with respect to the colour of the flower? Explain with the.help of crosses. Comment upon the pattern of inheritance seen in these two plants.

Suppose you and your friend are on the Moon. Will you be able to hear any sound produced by your friend ?

Statement-1: On moon you cannot hear your friend standing at some distance from you Statement-2: There is vacuum on moon.

(A) : When you shake hands with your friend the force involved is electromagnetic in nature. (R ) : Frictional force is electromagnetic in nature