Science & Mathematics Questions & Answers

Science & Mathematics Questions & Answers

Which is the world’s busiest port?

There are many thousands of different ports throughout the world. Some lie island on rivers and lakes, and can be reached by boats big enough to carry raw materials and manufactured goods. On coasts, there are fishing ports and seaports which handle trade. Seaports are situated on natural or specially built harbours, which offer safe anchorage for ocean-going vessels. The …

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Which is the world’s biggest gorge?

About six million years ago, the Colorado plateau in the south-western USA was a flat coastal plain. Winding slowly across it was the Colorado River. Gradually, earth movements pushed the plain upwards, making the river run faster and faster. The force of the flow began wearing out the Grand Canyon. This, the world’s largest gorge, is 446 km (277 miles) …

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Which is the first company to use barcode for sales?

On June 26, 1974, a 10-pack Wrigley’s chewing gum was the first product logged in a grocery store by a barcoding system using the modern universal product code. Later that year, the Uniform Grocery Product Code Council became the UPCC which regulates the issue and use of all universal product codes. At the same time, companies pursued the use of …

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Which is the brightest Star?

The number of stars which one can see without telescope is about 6,000. Before the invention of telescope, only six magnitudes or degrees of brightness of the stars were recognized. Today with the help of telescope stars up to 21st magnitude can be seen. There are 22 stars of the first magnitude. The brightness of all stars is Sirius, having …

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Which invention improved both cookery and education?

An important development in the history of education was the spread of gas lighting in the early 1800s. This followed the invention of coal gas by the British engineer, William Murdock, in 1792. Gas lights were much brighter than oil lamps. They illuminated whole rooms adequately at night and evening classes sprang up. As education for most people at this …

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Which invention has enabled people to swim freely underwater?

With a little training, we can all swim underwater as freely as a fish. All we need is an aqualung, which consists of portable breathing equipment carried by the diver. The aqualung supplied air naturally as the diver breathes in and out. Wearing froglike fins, aqualung divers can swim quickly with little effort. Before the aqualung was developed, divers had …

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