# Solved papers for 10th Class Science Solved Paper - Science-2016 Delhi Set-III

### done Solved Paper - Science-2016 Delhi Set-III

 Select saturated hydrocarbons from the following: ${{\mathbf{C}}_{\mathbf{3}}}{{\mathbf{H}}_{\mathbf{6}}};\,\,{{\mathbf{C}}_{\mathbf{5}}}{{\mathbf{H}}_{\mathbf{10}}};\,\,{{\mathbf{C}}_{\mathbf{4}}}{{\mathbf{H}}_{\mathbf{10}}};\,\,{{\mathbf{C}}_{\mathbf{6}}}{{\mathbf{H}}_{\mathbf{14}}};\,\,{{\mathbf{C}}_{\mathbf{2}}}{{\mathbf{H}}_{\mathbf{4}}}$.

• question_answer2) What happens when a Planaria gets cut into two pieces?

• question_answer3) Why are green plants called producers?

• question_answer4) What is meant by power of a lens? What does its sign (+ve or -ve) indicate? State its S.I. unit. How is this unit related to focal length of a lens?

• question_answer5) 'Reuse is better than recycling of materials'. Give reason to justify this statement.

• question_answer6) Name the compound formed when ethanol is heated in excess of cone. sulphuric acid at 443 K. Also write the chemical equation of the reaction stating the role of cone. sulphuric acid in it. What would happen if hydrogen is added to the product of this reaction in the presence of catalysts such as palladium or nickel?

 Two elements 'A' and 'B' belong to the 3rd period of Modern periodic table and are in group 2 and 13 respectively. Compare their following characteristics in tabular form: (a) Number of electrons in their atoms (b) Size of their atoms (c) Their tendencies to lose electrons (d) The formula or their oxides (e) Their metallic character (f) The formula of their chlorides

• question_answer8) What is meant by pollination? Name and differentiate between the two modes of pollination in flowering plants.

• question_answer9) In a monohybrid cross between tall pea plants (TT) and short pea plants (tt) a scientist obtained only tall pea plants (Tt) in the ${{F}_{1}}$ generation. However, on selfing the ${{F}_{1}}$ generation pea plants, he obtained both tall and short plants in ${{F}_{2}}$ generation. On the basis of above observations with other angiosperms also, can the scientist arrive at a law? If yes, explain the law. If not, give justification for your answer.

 (a) Draw a ray diagram to show the refraction of light through a glass slab and mark angle of refraction and the lateral shift suffered by the ray of light while passing through the slab. (b) If the refractive index of glass for light going from air to glass is 3/2, find the refractive index of air for light going from glass to air.

• question_answer11) State the cause of dispersion of white light passing through a glass prism. How did Newton show that white light of sun contains seven colours using two identical glass prisms. Draw a ray diagram to show the path of light when two identical glass prisms are arranged together in inverted position with respect to each other and a narrow beam of white light is allowed to fall obliquely on one of the focus of the first prism.

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