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CBSE CLASS 7 SCIENCE SAMPLE PAPER - 4

CBSE

Sample Paper 4

Class 7 Science

Sub: GENERAL SCIENCE                                                                                             Time: 3 Hours

Class: VII                                                                                                                        Max. Marks: 100

i. Questions 1 to 12 carries 1 mark each. Answer them in a word or a sentence.

   1. indicators

   2. Name the acid which is produced in the stomach.

   3. What is the function of platelets?

   4. Name the upper chambers of human heart.

   5. What is a convex lens?

   6. Name the part of a flower which develops into a seed after fertilization.

   7. What is hurricane?

   8. Exothermic reaction

   9. Anaerobic respiration

  10.Rectilinear propagation of light

  11.Afforestation

  12.What is neutralization reaction?

ii. Questions 13 to 23 carries 2 marks each. Answer them in 2 to 3 sentences.

  13. What are the differences between real and virtual images? (2 points).

  14. What is an aquifer? How is water in the aquifer available for use?

  15. Differentiate between absorption and assimilation.

  16. Give any 3 uses of hydrochloric acid.

  17. Give any 3 uses of calcium hydroxide.

  18. Why does a base applied to your skin give relief from an ant bite?

  19. What role does transpiration play in the transportation of water in a plant?

  20. A convex rear-view mirror is preferred over a plane mirror in a car. Why?

  21. How does planting trees help ground water conservation?

  22. Why should we not over water potted plants?

  23. Why is reproduction important?

iii. Questions 24 to 35 carries 3 marks each. Answer them in 4 to 5 sentences

  24. a) What are unisexual flowers? Give one example.

        b) Differentiate between self-pollination and cross pollination.

  25. a) Identify the diagram given below and define the process shown in it.

        b) Label the diagram according to the serial numbers given.

 

  26. a) What are indicators?

        b) Name any three indicators and mention their colour changes in acidic medium.

  27. a) Give any four methods used to prevent rusting.

        b) What are the reasons for the lowering of the water table in large cities?

  28. Give any 4 methods used to conserve water.

  29. What is a displacement reaction? What rule governs the displacement of an element

from a compound? Give an example.

 30. Why do we sometimes suffer from muscle cramps while exercising? How can you

overcome the cramps?

  31. a) What are the advantages of vegetative reproduction?

       b) What happens in a flower after fertilization?

  32. Name any two glands associated with human digestive system. Mention the juices

secreted by them and also write their functions.

  33. Describe the process of respiration in plants.

  34. Explain an activity to show the transpiration of water through cells. (Diagram not

needed).

  35. Explain how are wind currents generated due to uneven heating between equator and poles on the earth

iv. Questions 36 to 41 carries 5 marks each. Answer them as directed.

  36. a) Identify the diagram given below

 

       b) Label the diagram according to the serial numbers given.

       c) What are the various types of wastes formed in our body and mention how are they removed?

      d) Define dialysis.

  37.a) Name the factors which are responsible for the development of a cyclone.

       b) How does a thunder storm become a cyclone?

       c) What is a Tornado?

  38.a) Label the parts shown as A-F in the below schematic diagram of circulation.

       b) What is the function of the red pigment of blood? Where is this pigment present in blood?

  39. Give reasons for the following.

       a) Which mirrors are used as side mirrors in scooters? Give reason.

       b) Mention any three uses of concave mirrors.

  40. a) How are the three forms of water available on the earth? Explain.

        b) Mention the factors that lead to depletion of water table.

  41. a) What is the function of needle in a magnetic compass?

        b) Some electrical appliances have elements in them. How do you notice that they have become hot?

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