SCIENCE PRACTICE QUESTIONS CLASS 7





  SCIENCE  PRACTICE QUESTIONS CLASS7
1.Draw the symbols to represent cell and battery?      1
Q2. Give two examples of decomposers.  2
 Q 3 What is virtual image? Give one situation where virtual image is formed?  2
Q 4 Explain the function of bar screens in a waste water treatment plant.   2
Q 5 . State two differences between concave and convex lens.    2
Q 6 Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.       3M 
Q 7 Draw the circuit diagram to represent an electric circuit.Name any two effects of electric current.                                                      Q 8. (a)What is reflectionof light?                                                  3
(b) Give one use each of concave and convex mirror.
Q9. Explain the role of forest in maintaining the balance between oxygen and carbon  dioxide in the atmosphere .                              3
Q10 (a)What is sludge? Explain how it is treated?                                                                         5
(b) Name two chemicals used to disinfect water
Q 11. Current flows through the circuit when the circuit is in the  _____ condition.               1
(a) Broken (b) Incomplete (c) Closed (d) Open
Q12. Which of the following is not a plant product                                                                  1
(a)    Plywood (b) Gum (c) Resin (d) Kerosene

Q 13 Draw the symbols of  cell and battery. 2

Q 14  The image which  cannot be obtained on the screen.  
 When we stand in front of dressing table mirror it is an virtual image.  1+1
Draw a  Correct diagram  and give a correct diagram  Any two correct labels        ½  + ½ 
16. Use to remove large objects like rags, cans, plastic packets, napkins from wastewater treatment plant.         2
17. Concave lens is thinner in the middle and thicker at the ends and it diverges the light  ray falling on it. Convex lens is thicker in the middle and thinner at the ends and it converges the light rays falling on it. Or any other two correct differences   1+1 
18. Correct definition         1 Concave mirror use by the dentists to see the enlarged image of teeth. Convex mirror use as rear view mirror of the vehicles. Or any other correct use of each  1+1
19. Forest produce oxygen by the process of photosynthesis & it is used by animals for respiration.          3

 20. (a)Correct definition of sludge        1
    Correct treatment          2
(b)Ozone and Chlorine or any two correct chemicals     2











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