1. It is a common experience that wet paper is much easier to tear than dry paper. ace why?
Paper is made of cellulose fibers. These fibers are glued together. While tearing the paper, we have to apply a force much more than the mutual force of the fibers. In the presence of water, the mutual force of the fibers (which is produced by static electricity) weakens. salt (sodium chloride) in water Therefore it dissolves because the electric force between its positive and negative charges weakens and it dissolves. In the case of paper, this effect is clearly visible as the water makes the paper wet. At the same time, water molecules flow into space between the fibers and weaken their mutual force.
2. Why does the stream of water collect?
of air trapped in a stream of water, The sound of a clump is produced by the pulsation of the bubbles. Vibrating air bubbles behave like oscillating bells and produce sound waves that we can hear.
3. At night, the eyes of animals shine like embers even when there is a slight light, whereas this is not the case with humans. Why does this happen?
Unlike the human eye, the tapetum lucidum in the animal's eye There is a layer that reflects the light. In the eyes of animals, the layer of this substance acts like a semi-transparent, spherical, convex mirror, which reflects the incoming light in the form of a glowing cone. If you are outside this cone, then you will not be able to see his eyes at all. For this reason, it helps animals to see their surroundings better at night.
4. What could be the reason why humans blink?
The blinking of the eyelids is a kind of protection mechanism for our eyes. By blinking repeatedly, the water present in the eyes spreads evenly throughout the eye. Eyes need constant moisture. If there is no moisture, then the eyes will get spoiled. If they are left open continuously, they will dry up, causing irritation. Blinking the eyelids also removes small foreign elements present in the eyes from the cornea and conjunctiva. In strong wind and storm, the eyelids are closed, so that the dust does not go away. Even when sneezing, the eyelids are closed so that the pupils do not come out.
5. What is such a creature that always eats?
The mole is one of the smallest and oldest mammals found on Earth, perhaps even the shyest. Yes, it is usually addressed with the feminine gender. But they have male and female. Many of its species are found in the world. Here we are talking about domestic chives found in India. Roughly four to six inches long, resembling a rat, this creature is actually quite different from a rat. Its nose goes far beyond the lower lip and jaws and becomes sharp. The ears are much smaller than the ears of a mouse.
The hair on the body of this colored creature is short, thick velvety, but the mustache is very big. Its tail is short and thick. Its agile feet are very small and without sharp claws. With these it can neither dig burrows nor can it climb trees and walls. opportunity When it falls, it floats in water. The eyes are very small, nauseous, and weak-sighted, with which the only one can distinguish between light and darkness. Sense of smell is not the answer, it is quite intense, the dust usually lives in the remote dark corners of houses, old burrows under garbage and junk. He determines the way of his movement by smelling or by the touch of his mustache. Most of these paths are away from the light and with the help of walls.
Once the path is decided, it keeps on running without ever looking ahead. To find him again when he has lost his way takes a lot of running. On such occasions, this creature, which is generally calm, gets upset and screams in a shrill voice. If any obstacle is placed on its fixed path, it will definitely collide with it, then save it and make a new path. Even if the barrier is removed, he will continue on the same new path. Whenever the mole is on a trip with the family, the male mole is at the forefront. A child holding her tail in the mouth, whose tail in the mouth of the second child, and the female with the tail of the last child in her mouth.
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