Term 2 Full Syllabus Three Marks Questions

8th Standard EM

    Reg.No. :
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Science

Time : 01:30:00 Hrs
Total Marks : 60
    20 x 3 = 60
  1. Write a note on thermostat.

  2. Explain the working of thermos flask.

  3. Explain three ways of charge transfer.

  4. What is electroscope? Explain how it works?

  5. How lightning takes place?

  6. What is electroplating? Explain how it is done.

  7. What happens when carbon dioxide is passed through lime water? Write the equation for this reaction.

  8. Name the compounds produced when the following substances burn in oxygen.
    a) Carbon
    b) Sulphur
    c) Phosphorous
    d) Magnesium
    e) Iron
    f) Sodium

  9. What are the effects of acid rain? How can we prevent them?

  10. Find the valency of the element which is underlined in the following formula.
    a) NaCl
    b) CO2
    c) Al (PO4)
    d) Ba (NO3)2
    e) CaCl2

  11. Write the chemical formula for the following compounds
    a) Aluminium sulphate b) Silver nitrate c) Magnesium oxide d) Barium chloride

  12. Write the skeleton equation for the following word equation and then balance them.
    a) Carbon + Oxygen → Carbon dioxide
    b) Phosphorus + Chlorine → Phosphorus pentachloride.
    c) Sulphur + Oxygen → Sulphur dioxide
    d) Magnesium + hydrogen → Magnesium + Hydrogen chloride chloride

  13. Balance the following chemical equation.
    a) Na + O2 → Na2O
    b) Ca + N2 → Ca3N2
    c) N2+ H2 →NH3
    d) CaCO3 +HCl → CaCl2 + CO2 +H2O
    e) Pb(NO3)2 → PbO + NO2 + O2

  14. Differentiate between the following.
    a) Movement and Locomotion.
    b) Endoskeleton and Exoskleton
    c) Pectoral and Pelvic girdle
    d) Ball and socket Joint and Hinge Joint
    e) Voluntary and Involuntary muscle

  15. What are antagonistic muscles? Give one example.

  16. How is the skeleton of a bird well-suited for flying?

  17. What are the functions of skeleton in human body?

  18. What are the physical changes that occur in boys and girls during adolescence?

  19. Briefly describe the menstrual cycle.

  20. Briefly explain the nutritional needs of adolescence.

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