Solved papers for 10th Class Science Solved Paper - Science-2017 Outside Delhi Set-II

1) Write the molecular formula of the 2nd and 3rd member of the homologous series whose first member is ethene.

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2) Newly formed DNA copies may not be identical at times. Give one reason.

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3) In the following food chain, plants provide 500 J of energy to rats. How much energy will be available to hawks from snakes?

Plants\[\to \]Rats\[\to \]Snakes\[\to \]Hawks

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4) An object is placed at a distance of 15 cm from a convex lens of focal length 20 cm. List four characteristics (nature, position, etc.) of the image formed by the lens.

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5) Why is an equitable distribution of resources essential in a society? List two forces which are against such distribution.

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6) Why must we conserve our forests? List two factors responsible for causing deforestation.

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What happens when

(write chemical equation in each case)

(a) ethanol is burnt in air?

(b) ethanol is heated with excess conc. \[{{H}_{2}}S{{O}_{4}}\] at 443 K?

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8) Explain esterification reaction with the help of a chemical equation. Describe an activity to show esterification.

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9) With the help of two suitable examples, explain why certain experiences and traits earned by people during their lifetime are not passed on to their next generations. When can such traits be passed on?

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10) Describe reproduction by spores in Rhizopus.

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11) Draw ray diagrams to show the formation of three times magnified (a) real, and (b) virtual image of an object by a converging lens. Mark the positions of O, F and 2F in each diagram.

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12) What is 'dispersion of white light'? State its cause. Draw a ray diagram to show the dispersion of white light by a glass prism.

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