Science & Mathematics Questions & Answers

Distilled water does — but very little compared to piped, well or salt water. The reason is that the way a liquid conducts electricity is by the positively or negatively charged ions that are actually moving from one of the electrodes to the other, carrying charge (electricity) with them. Salt water has salt in it, NaCl, which readily ionizes or …

Well, as a matter of fact the sun is shining at night, but we can’t see it. The Earth, which is rotating in space, turns completely round once every twenty-four hours. In the course of this rotation each part of the glob will be facing the sun for a certain amount of time. It is this time which we call …

All the food we eat goes into our stomach. Here, it is broken into smaller and simpler substances and get absorbed into the blood. Then, the blood carries these food particles to the different cells of the body, where they are used to provide energy to our body. How is food broken into smaller particles? When we eat, the glands …

There wouldn’t be much point in locking your door if you knew that anyone cold come along with another key and unlock it! Locks and keys are made for keeping things safe from burglary or damage, and you should always lock up a house if you are going our, or a car if you are leaving it parked in a …

The grain is a piece of wood is the pattern produced by the annual bands or rings which row in the trunk of the tree during its lifetime. The tree’s rate of growth varies with the seasons. In the spring soft porous wood is needed to carry sap. In the summer, stronger cells of hard wood develop to support the …

Have you ever had a drink of cool refreshing water from a matka or earthen pot placed outside? Surprisingly enough, the pots are exposed to blazing sunlight, yet the water within stays so cool. How is that possible? This is because of a physical process known as evaporation. When a liquid changes to a gaseous (or vapour) state without boiling, …

Twins are monozygotic dizygotic. Monozygotic twins are externally identical while dizygotic twins may or may not be identical. Every human has two things which are unique to him-finger prints and DNA. In any case twins cannot have identical DNA or finger prints because they are genetically different. But clones are genetically identical and hence finger prints of clones are supposed …

If it is not refregerated, milk gets infected with pathogens (Becteria, Viruses), so it is boiled at regular intervals. When milk is boiled at 100 degree Celsius, nearly all pathogens get killed. And boiling retains the enzymes, taste, flavour and nutrients that are present in milk. In the refrigerator, the bacteria get inactivated, but they don’t die. Hence, boiling is …

Our skin is a true waterproof, for nothing can enter it from the out side. Of course, it will allow water to come out in the form of sweat. Our skin contains millions of tiny tubes which carry sweat from the inner(true) skin to the finer skin on the surface of the body. With the sweat glands exerting pressure upwards, …

The World Wildlife Fund was founded in UK by Sir Peter Scott, a British naturalist and painter, in 1961. The WWF got the idea of using Chi-Chi, a female giant panda at London Zoo. The team felt “the big, furry animal with her appealing, black-patched eyes” would make an excellent logo. Another reason was to minimize printing costs (it needed …