Question 1: You have been provided with three test tubes. One of them contains distilled water and the other two…
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Question 1: Why should a magnesium ribbon be cleaned before it is burnt in air? ANSWER: Magnesium is an extremely…
Human Eye It is one of the sensitive sense organs present in living organisms. It acts like a Camera. The image…
Question 1: (a) On what basis did mandeleev arrange the elements in his periodic table? (b) On what basis are…
Question 1: Name the element whose one of the allotropic forms is buckminsterfullerene. ANSWER: Carbon has buckminsterfullerene as one of…
Question 1: What colour do the following indicators turn when added to a base or alkali (such as sodium hydroxide)?…
Question 1: Why is respiration considered an exothermic process? ANSWER: In respiration, glucose undergoes slow combustion by combining with oxygen…
Question 1: Name two fossil fuels. ANSWER: Petroleum and coal are two fossil fuels. Page No 258: Question 2: Name…
Question 1: What is the functional unit of the environment comprising of the living and non-living components called? ANSWER: The…
Question 1: Which of the processes, sexual reproduction or asexual reproduction, bring about maximum variations in the offsprings? ANSWER: Maximum…