How to ? Science And Technology Question & Answer – Part 12

Science Question and Answers Riddle Part 12

In How to know, about science and technology series we will provide you information about science and technology, We are in making part of series and every part will contain 8-10 scientific questions and answer !


A liquid can flow and change its shape. Liquids include water, milk, mercury, petrol and oil. When a certain amount of liquid is placed in a container, it takes the shape of the container but its volume remains the same.

In a liquid, the atoms or molecules are in small groups that move about on their own. This is why a liquid can flow and take up any shape, and why a piece of a solid can move through a liquid.


A gas is a substance that flows and A increases in size until it fills a container. The air is a mixture of gases. It has no container and spreads out over the entire world. As well as oxygen and other gases in the air, gases include steam, chlorine, hydrogen and helium.

In a gas, the atoms or molecules are not linked together. They move about singly in all directions at great speed. This is why a gas rapidly takes up all the space in a container and fills it.


Water is made of hydrogen and oxygen. In water In water molecules, hydrogen atoms and oxygen atoms are linked together. They do not normally come apart.

Water can be changed into hydrogen gas and oxygen gas by passing an electric current through it. In fact, water does not conduct electricity very well, so a little acid is usually added.


Mercury is the only liquid metal. All A other metals, like iron, copper or aluminium, are solid. However, mercury becomes solid if it gets cold enough. But it has to be very cold, at least 39°C or colder.

Mercury is unusual only because its freezing point of 39°C is the lowest of any metal. This is also lower than the normal range of temperature at which we live.

Mercury is therefore a good liquid to use in thermometers. Mercury is also used in mercury barometers, which measure the pressure of the atmosphere.


Air is made of the gases oxygen. A nitrogen and argon. The air always contains the same amounts of these gases. Unless the air is dry, it also contains some water vapour.

The approximate proportions of the gases in pure air at sea-level are nitrogen 78%, oxygen 21% and argon 1%. There are also very small amounts of carbon dioxide. neon and helium.

The air also contains varying amounts of water vapour and gases that come from burning fuel, as well as dust particles floating in the air.


All colours can be made by mixing any of three main colours. These are called primary colours. In paints and inks, the three primary colours are yellow, cyan (blue-green) and magenta (red-blue). Mixing yellow and cyan, for example, gives green.

We can make all colours from just three primary light colours because our eyes are sensitive to red, green and blue. When we see a particular colour, our eyes pick out the amounts of red, green and blue in it and mix them together.


White light is in fact a mixture of A colours. If you pass white light through a glass prism, it splits up into a band of colours called a spectrum. If the spectrum colours are passed through another prism, they mix together to give white.

The colours of the spectrum are the same as the colours of the rainbow. This is because the raindrops that form a rainbow each split sunlight up in the same way as a prism.

The pattern is a mixture of three bands of the primary colours, red, green and blue


A mirage is an image of a place or a thing that you can see on the ground some distance away. Mirages happen on warm days, and often look like pools of water. You see them because warm air near the ground bends light rays. An image of the sky appears on the ground, This is the ‘pool’ of water.


Optical fibers are long, thin threads A of glass. Light travels along them, no matter how much they bend, Doctors can look inside the body without cutting it open by using optical fibers , The fibers send light into the body, and are attached to tiny lenses so that they can bring pictures back.

In the future, homes are likely to be connected by cables containing optical fibers , just as they are connected by telephone wires now.

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