You Are On Question Answer Bank SET 1998
99901. How did the Romans rub off what was written on a wooden slate coated with wax?
Answer: By heating the slate, the wax was melted. The slate became ready to reuse.
99902. What are salivary glands?
Answer: Salivary glands are located in the mouth. There are three pairs, one pair is located in front of the ears, one pair is located underneath the lower jaw and the third is under the tongue. Salivary glands secrete an enzyme called ptyalin, which helps in the digestion of starches. Saliva has an alkaline action. If you see many players chewing gum, it is because when a person is tense, the stomach produces more acids. The saliva, produced by chewing gum, neutral
99903. Who produced the first synthetic dye?
Answer: William Perkin.
99904. Which discovery made soap-making a big industry?
Answer: It was discovered (in 1787) that caustic soda can be made from common salt. Since soap is made from caustic soda and fat, manufacturing soap became cheaper.
99905. Where do sea plants obtain carbon dioxide to manufacture their food?
Answer: From dissolved gases
99906. Who was the first woman of Indian origin to travel in a space vehicle?
Answer: Kalpana Chawla.
99907. The chemical name of Chloroform is
99908. A compound which contains only hydrogen and Carbon is called a
99909. What is the human body made up of, according to Hippocrates?
Answer: Blood, phlegm, yellow bile and black bile.
99910. What is an element?
Answer: An element is a substance that cannot be broken down or decomposed into smaller parts by ordinary chemical means.
99911. Who coined the word Vitamin?
99912. Penicillin is obtained from
99913. What is larva?
Answer: A larva is a young animal that is not fully developed but is able to move about and feed itself. It changes into an adult animal that usually looks different. This change is called metamorphosis. Tadpoles, which grow into frogs, caterpillars, which grow into butterflies, and grubs, which grow to become beetles, are all examples of larva.
99914. Vulcanised rubber was invented by
Answer: Charles Goodyear
99915. How big is the Milky Way?
Answer: It is estimated that the Milky Way has over a hundred billion stars. The sun is one of the stars in the Milky Way.
99916. What is a Catamaran?
Answer: A boat with twin parallel hulls. [From the Tamil words katta and maram, meaning tied up (katta) tree (maram).
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99917. Mercury is closest to the sun, then how come Venus is the hottest planet?
Answer: Venus has thick clouds around it that prevent heat from escaping from its surface.
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