Solved papers for 10th Class Science Solved Paper - Science-2015 Delhi Set-II

done Solved Paper - Science-2015 Delhi Set-II Total Questions - 10

• question_answer1) Write the name and formula of the 2nd member of homologous series having general formula \[{{\mathbf{C}}_{\mathbf{n}}}{{\mathbf{H}}_{\mathbf{2n}+\mathbf{2}}}\].
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• question_answer2) What is the magnification of the images formed by plane mirrors and why?
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• question_answer3) What is meant by power of a lens?
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• question_answer4) Write two differences between binary fission and multiple fission in a tabular form.
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• question_answer5) 

  (a) Why do we need to manage our resources carefully?

  (b) Why management of natural resources requires a long term perspective?]

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• question_answer6) List four measures that can be taken to conserve forests.
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• question_answer7) Na, Mg and Al are the elements of the same    period of Modern Periodic Table having one, two and three valence electrons respectively. Which of these elements (i) has the largest atomic radius (ii) is least reactive? Justify your answer stating reason for each case.
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• question_answer8) What is meant by isomers? Draw the structures of two isomers of butane, \[{{\mathbf{C}}_{\mathbf{4}}}{{\mathbf{H}}_{\mathbf{10}}}\]. Explain why we cannot have isomers of first three members of alkane series.
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• question_answer9) What are sexually transmitted diseases. List two example of each diseases caused due to (i) bacterial infection and (ii) viral infection. Which device or devices may be used to prevent the spread of such diseases.
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• question_answer10) What is speciation? List four factors    responsible for speciation.
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