Science & Mathematics Questions & Answers

Southern Arabia contains one of the world’s bleakest deserts, which is visited only by the hardiest Bedouin nomads. Like all deserts, this is a place of extremes, and they must be prepared to risk hunger and thirst, and exposure to heat by day and bitter cold by night. The region is the Rub al Khali, or the Empty Quarter. Much …

Since World War II, many countries have joined common markets. These organizations try to develop the economies of the member countries, especially by removing all trade restrictions between them. The European Economic Community (EEC) was founded in 1957 by Italy, France, Belgium, Luxembourg, the Netherlands and West Germany. Six nations joined later: Denmark. Ireland and the UK in 1973; Greece …

The E layer is a region of the ionosphere, extending from about 90-150 kilometres above the Earth, which influences long-distance communications by strongly reflecting radio waves in the 1-3 megahertz. It is also called E region, Heaviside layer, or Kennelly-Heaviside layer. This region reflects radio waves of medium wavelength and allows their reception around the surface of the Earth. The …

Christian Johan Doppler (1803-1853) was an Australian scientist born in Salzburg who made and important discovery about the effects of sound and light when the sources are moving in relation to the observer. You may find the Doppler effect easier to understand if you consider what happens to the noise of a train as it approaches you and then fades …

The charging end of the glass furnace is commonly referred to as the ‘dog house’. It comprises a tank with spaced sidewalls. The glass batch (raw material) is fed continuously into this opening – called dog house – at one end of the tank, and the melted, refined and conditioned glass is drawn out the other end.

The human brain is at the top of the head, behind the forehead. The brains of other animals are behind their faces. Compared with the brain of an animal, the human brain has became enormous and room has had to be found somewhere for it. It is the size of our brain that more than anything else distinguishes us from …

Moong bean sprouts are the young shoots of moong beans used as a vegetable. Soybean is rich in oil and protein, as compared to moong bean sprouts.

Both creepers and climbers are weak-stemmed plants and, hence, cannot grow erect without support. The difference is that creepers spread horizontally along the soil. At the nodal regions – where leaves grow – they produce fibre-like roots arising from the base of the stem, which get fixed and grow further. Such stems in creepers are called prostrate stems. Climbers take …

Whenever it rains, the soil absorbs the water. The water goes down into the ground. When it reaches down to such as place where a porous rock or sand is surrounded by hard rocks, it is collected there. A pressure is built up due to hard rocks around it. When we dig a hole in the ground and it gives …

An Atom bomb releases energy generated by the breaking apart of plutonium or uranium nuclei. A hydrogen bomb release energy created when atoms of an isotope of hydrogen are brought together. It takes an atom bomb, to create the conditions to operate a hydrogen bomb so a fission device is installed to trigger a fusion, or thermonuclear, explosion, duplicating conditions …