science important questions class 10

  • Class 10 Science Important Question for CBSE Exam

    Class 10 Science Important Question for CBSE Exam   How Do Organisms Reproduce? Chapter Wise Important Questions Class 10 Science SHORT ANSWER TYPE QUESTIONS [3 Marks] – Year 2007 Question. 1(i) What is fertilisation? Distinguish between external fertilisation and internal fertilisation. (ii) What is the site of fertilisation in human beings? Answer. (i) Fertilisation is defined as the fusion of a male gamete (sperm) with a female gamete (an ovum or egg) to form a zygote during sexual reproduction. (ii)…

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  • Class 10 Science Important Question for CBSE Exam

    Class 10 Science Important Question for CBSE Exam   Control and Coordination Chapter Wise Important Questions Class 10 Science Very Snort Answer Type Question [1 Mark] -Year 2015 1.Why is it advised to use iodised salt in our diet ? Answer. Iodine stimulates the thyroid gland to produce thyroxin hormone. Deficiency of this hormone results in the enlargement of the thyroid gland. This can lead to goitre. Short Answer Type Questions[ll] [3 Marks] -Year 2015 2.State how concentration of auxin…

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  • Class 10 Science Important Question for CBSE Exam

    Class 10 Science Important Question for CBSE Exam   Life Processes Chapter Wise Important Questions Class 10 Science Short Answer Type Questions[l] [2 Marks] -Year 2015 1.What are enzymes? Name any one enzyme of our digestive system and write its function. Answer. Enzymes are biological catalysts. Catalysts are proteins that increase the rate of chemical reactions without being used up. For example: Amylase catalyses the breakdown of starch into sugars in the mouth and small intestine 2.(i) Write the balanced…

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  • Class 10 Science Important Question for CBSE Exam

    Class 10 Science Important Question for CBSE Exam   Carbon and its Compounds Chapter Wise Important Questions Class 10 Science VERY SHORT ANSWER TYPE QUESTION [1 Mark] – Year 2007 Question.1 Give the names of the following functional groups: (i) —OH (ii) —COOH Answer. (i) Alcohol group (ii) Carboxylic acid group VERY SHORT ANSWER TYPE QUESTION [1 Mark] – Year 2008 Question.2 What is the difference in the molecular formula of any two consecutive members of a homologous series of…

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  • Class 10 Science Important Question for CBSE Exam

    Class 10 Science Important Question for CBSE Exam   Metals and Non-Metals Chapter Wise Important Questions Class 10 Science Short Answer Type Questions[l] [2 Marks]-Year 2015 1.Write one example of each of (i) a metal which is so soft that, it can be cut with knife and a non-metal which is the hardest substance. (ii) a metal and a non-metal which exist as liquid at room temperature. Answer. (i) Sodium, carbon (diamond). (ii)Mercury is liquid metal, bromine is liquid non-metal.…

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  • Class 10 Science Important Question for CBSE Exam

    Class 10 Science Important Question for CBSE Exam   Acids Bases and Salts Chapter Wise Important Questions Class 10 Science Short Answer Type Questions[l] [2 Marks] – Year 2015 1.Name the acid present in the following: (i) Tomato (ii) Vinegar (iii) Tamarind Answer. (i) Oxalic acid (ii) Acetic acid (iii) Tartaric acid 2.15 mL of water and 10 mL of sulphuric acid are to be mixed in a beaker (i) State the method that should be followed with reason. (ii)What…

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  • Class 10 Science Important Question for CBSE Exam

    Class 10 Science Important Question for CBSE Exam   Chemical Reactions and Equations Chapter Wise Important Questions Class 10 Science Short Answer Type Questions[l] [2 Marks] -Year 2015 1.“We need to balance a skeletal chemical equation.” Give reason to justify the statement. Answer. Skeletal chemical equation are unbalanced. We need to balance chemical equation because of law of conservation of mass. It states that ‘matter can neither be created nor be destroyed’. Therefore chemical equation must be balanced in each…

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