General Knowledge in Science
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No. | Question | Answer |
751 | Why do earth and other planets revolve around the sun? | Sun's gravitational force keeps the planets in a fixed orbit. |
752 | Name the unit in which electric current is measured? | Ampere. |
753 | Which planet in the solar system moves faster around the sun than any other planet? | Mercury. |
754 | What are antibiotics? How do antibiotics help in curing diseases caused by bacteria? | In nature, there are moulds and bacteria that attack other organisms in order to obtain nourishment and to reproduce. Antibiotics are chemical substances produced by organisms (usually microorganisms) that are harmful to other bacteria and life forms. If you moisten a piece of stale bread and keep it in the open, there will be a greenish growth on it a little later. That is because of the spread of a mould called Penicillium Notatum. It produces penicillin. Penicillin is a highly effective antibiotic. Most bacteria double every half an hour. Just one bacterium (singular of bacteria) becomes thousands within a few hours. An antibiotic does not permit the multiplication of bacteria. In many cases, the antibiotic does not permit even the survival of bacteria. |
755 | Which is the star closest to our earth, after the sun? | ProximaCentauri. |
756 | Who founded the school of mathematics at Alexandria in Egypt? | The Greek mathematician Euclid around 300 B.C. |
757 | What are the remains of animals or plants, preserved deep under the earth or in rocks, etc called? | Fossils. |
758 | The intensity of which insect's song gives us an indication of the temperature? | The cricket. |
759 | What was the name of the first Atomic Reactor built by India? Where is it? | Apsara, in Mumbai. |
760 | Which are the only planets to revolve clockwise around the sun? | Venus and Uranus. |
761 | What is the study of water with reference to its occurrence in nature known as? | Hydrology. |
762 | How can gargling with salt water help relieve a sore throat? | An infection of the throat spreads rapidly. Quite a few varieties of bacteria double every half an hour. Gargling with warm water does not kill these bacteria, but it prevents their growth. Temperatures of more than 40 degrees Celsius are not conducive to the growth of bacteria. Any solution which has more than eight per cent salt inhibits the growth of bacteria. Thus, if you gargle with warm salt water, it will prevent the proliferation of bacteria. |
763 | Why does the sound of water keep changing when a vessel is being filled under a tap? | Sound is produced by the movement of columns of air. Strike a stainless steel glass with a spoon. A sound is produced. Stop the vibration of the steel glass with your fingers. There will be no sound. When water is being filled in a vessel, sound is produced because of the movement of the column of air. This column becomes smaller and smaller as the water level rises in the vessel. Hence the sound changes. |
764 | What is the form in which iron is found in nature? | Iron Oxide. |
765 | Who invented the Dynamo? | Michael Faraday. |
766 | How does a cricket produce the chirping sound? | By rubbing its legs against one of its front wings. |
767 | What is magma made of? | Molten rocks. |
768 | Who first introduced the concept of molecules? | Amedeo Avogadro in the year 1811. |
769 | From the bark of which tree is quinine extracted? | Cinchona. |
770 | Where do frogs usually live in the hot season? | Buried at the bottom of ponds. |
771 | Who discovered Calcium? | Sir Humphry Davy. |
772 | Which is the most abundant metal in the earth's crust? |
Aluminium. |
773 | What is matter made of? | Matter is made of electrically charged protons, found in the nucleus and electrons travelling about the nucleus. In addition, there are neutrons in the nucleus with a weight similar to protons but lacking any charge. |
774 | Who first introduced vaccination in medical practice? | Edward Jenner. |
775 | Name the only two poisonous lizards in the world | The Gila Monster and the Beaded Lizard. |
776 | What is the scientific study of the earth's crust known as? | Geology. |
777 | Name the mammals that lay eggs. | Platypus and Echidna. |
778 | Why did Galileo come into conflict with the church? | Because he supported the Copernican theory that the planets (including the earth) revolve around the sun. |
779 | What does U.F.O stand for? | Unidentified Flying Object. |
780 | Which is the brightest star in the sky at night? | Sinus. |
781 | What method of healing is also known as shiatsu? | Acupressure. |
782 | What is Hypothermia? | It is a body condition in which the temperature falls suddenly as a result of exposure to extreme cold. |
783 | What is the thin flap of cartilage attached to the base of the tongue of terrestrial vertebrates called? | Epiglottis. |
784 | What is the term used to describe the remains of forests where the trees have been submerged or buried and the tree tissues have been replaced gradually by minerals such as silica or calcite? | Petrified Forest. |
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