8th Standard English Medium Science Subject Book Back 3 Mark Questions with Solution Part - I

8th Standard

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Science

Time : 00:30:00 Hrs
Total Marks : 45
    15 x 3 = 45
  1. Name some common systems of measurement.

  2. How do sailors protect their ship during a heavy storm?

  3. Define focal length?

  4. Tabulate four points of difference between metals and non-metals.

  5. Justify the statement. Burning of fossil fuels is responsible for global warming.

  6. What are antibiotics?

  7. Write any three economic importance of algae.

  8. Tabulate the difference between aerobic and an aerobic respiration.

  9. What is a Computer?

  10. With the help of a neat diagram explain the working of a calorimeter

  11. What is electroscope? Explain how it works?

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

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

  14. What are antagonistic muscles? Give one example.

  15. Explain the role of hormones in reproduction.

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