Term 1 Model Questions

8th Standard EM

    Reg.No. :
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Science

Time : 01:00:00 Hrs
Total Marks : 50
    10 x 1 = 10
  1. Quantities other than base quantities are called as

    (a)

    supplementary quantities

    (b)

    derived quantities

    (c)

    professional quantities

    (d)

    energy quantities

  2. Which of the following statements about approximation is wrong?

    (a)

    Approximation gives accurate value

    (b)

    Approximation simplifi es the calculation

    (c)

    Approximation is very useful when little information is available

    (d)

    Approximation gives the nearest value only

  3. Pressure exerted by a liquid is increased by

    (a)

    the density of the liquid

    (b)

    the height of the liquid column

    (c)

    Both (a) & (b)

    (d)

    None of the above

  4. The refractive index of water is

    (a)

    1.0

    (b)

    1.33

    (c)

    1.44

    (d)

    1.52

  5. An imaginary line perpendicular to the reflecting surface is called

    (a)

    imaginary line

    (b)

    curved line

    (c)

    Perpendicular line

    (d)

    normal

  6. Decomposition of limestone is an example for chemical reaction based on __________

    (a)

    contact

    (b)

    electricity

    (c)

    light

    (d)

    heat

  7. __________is an example for Lophotrichous

    (a)

    vibrio

    (b)

    Pseudomonas

    (c)

    Rhodospirillum

    (d)

    Corny bacterium

  8. The estimated number of species on the earth is _________ million

    (a)

    8.7

    (b)

    100

    (c)

    120

    (d)

    150

  9. _______tissues for conduction of nerve impalses

    (a)

    Epithelial

    (b)

    Muscular

    (c)

    Nervous

    (d)

    Supporting

  10. Pick out the odd one

    (a)

    Speaker

    (b)

    Printer

    (c)

    Keyboard

    (d)

    Monitor

  11. 5 x 2 = 10
  12. Convert 300 K into celsius.

  13. If two plane mirrors are inclined to each other at an angle of 90°, find the number of images formed.

  14. What happens to the brine during electrolysis?

  15. What do you mean by coenocytic mycelium?

  16. Name any four input devices.

  17. 5 x 3 = 15
  18. What are the differences between Plane angle and solid angle?

  19. Give any two uses of super conductors

  20. State the Snell’s law of refraction

  21. What are the characters of monocotyledons.

  22. What is the significance of stem cell?

  23. 3 x 5 = 15
  24. Write a note on refraction in medium and list out the refractive index of some substances.

  25. Explain the biological effects of chemical reactions

  26.  Explain the mechanism of breathing.

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