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

### done Solved Paper - Science-2016 Outside Delhi Set-II

• question_answer1) What are those organisms called which bear both the sex organs in the same individual. Give one example of such organism.

• question_answer2) Write one negative effect, on the environment, of affluent life style of few persons of a society.

• question_answer3) ?The magnification produced by a spherical mirror is$\mathbf{3}$?. List four informations you obtain from this statement about the mirror/image.

• question_answer4) Forests are ?biodiversity hot spots.? Justify this statement.

• question_answer5) What is water harvesting? How can this technique help in the conservation of water?

• question_answer6) On dropping a small piece of sodium in a test?tube containing carbon compound ?X? with molecular formula ${{\mathbf{C}}_{\mathbf{2}}}{{\mathbf{H}}_{\mathbf{6}}}\mathbf{O,}$ a brisk effervescence is observed and a gas ?Y? is produced. On bringing a burning splinter at the mouth of the test?tube the gas evolved burns with a pop sound. Identify ?X? and ?Y?. Also write the chemical equation for the reaction. Write the name and structure of the product formed, when you heat ?X? with excess cone sulphuric acid.

 Three elements ?X?, ?Y? and ?Z? have atomic numbers 7, 8 and 9 respectively. (a) State their positions (Group number and period number both) in the Modern Periodic Table. (b) Arrange these elements in the decreasing order of their atomic radii. (c) Write the formula of the compound formed when ?X? combines with ?Z?.

• question_answer8) In the context of reproduction of species state the main difference between fission and fragmentation. Also give one example of each.

 With the help of an example justify the following statement: ?A trait may be inherited, but may not be expressed.?

• question_answer10) The image of an object formed by a lens is of magnification ?1. If the distance between the object and its image is 60 cm, what is the focal length of the lens? If the object is moved 20 cm towards the lens, where would the image be formed? State reason and also draw a ray diagram in support of your answer.

 (a) Define focal length of a spherical lens. (b) A divergent lens has a focal length of 30 cm. At what distance should an object of height 5 cm from the optical centre of the lens be placed so that its image is formed 15 cm away from the lens? Find the size of the image also. (c) Draw a ray diagram to show the formation of image in the above situation.

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