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SCIENCE SUMMATIVE ASSESSMENT – II FOR CLASS-X

  1. How does the Ozone layer of atmosphere protect the humans on earth ?
  2. A student has difficulty in reading the blackboard while sitting in the last row. What could be the defect of vision the student is suffering from ? What are the causes for this disorder ?
  3. How does the atomic radius change as we go (a) from left to right across a period ? (b) down a group in the periodic table ? 
  4. What is reproduction ? Mention the importance of DNA copying in reproduction.
  5. Describe the role of the following in human beings. (a) Ovary (b) Prostate gland 
  6. The refractive index of a dense flint glass is 1.65 and for alcohol it is 1.36 with respect to air. Find the refractive index of dense flint glass with respect to alcohol.
  7. Draw a ray diagram to show refraction of light through a triangular glass prism and show angle of incidence and angle of deviation.
  8. A child has difficulty in reading the blackboard while sitting on the last bench in a classroom. What could be the defect the child is suffering from ? List two main causes of this defect.
  9. List four stakeholders of forests.
  10. What is water harvesting? Mention any two water harvesting structures.
  11. (a) Give a chemical test to distinguish between saturated and unsaturated hydrocarbons. (b) Name the products formed when ethanol burns in air. List two forms of energy that are librated on burning ethanol. (c) Why is the reaction between methane and chlorine considered a substitution reaction?
  12.  Draw the labelled longitudinal structure of a flower showing its parts.
  13. Draw the ray diagram for the formation of image by a concave lens when the object is placed between the infinity and optical center of the lens.State the nature of the image formed.
  14. Why do stars appear to twinkle while the planets do not ? Explain with the help of diagram. 
  15. Explain with the help of diagram why the sun is visible to us two minutes before the actual sun-rise and two minutes after the sunset.
  16. How are coal and petroleum formed ? Name two elements present in coal and petroleum in addition to carbon.
  17. There are many advantages of water stored in the ground .State any two of them.
  18. What are isomers ? State two properties of carbon which lead to the huge number of carbon compounds .                                                                                                                                              10th board sample papers, 10th CBSE sample papers, 10th class guess papers, 10th class sample paper, 10th class sample papers, 10th science sample paper, 12th board sample papers, 12th class sample paper, 12th class sample papers, CBSE board guess papers, CBSE board sample papers, CBSE class xii sample papers, CBSE guess papers 2013, CBSE practice paper, CBSE practice papers, CBSE sample paper, CBSE sample paper 2013, CBSE sample papers, CBSE solved papers, x class sample papers, xii CBSE sample papers, xii class sample

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