Half Yearly Model Question Paper 2019 - 2020

8th Standard EM

    Reg.No. :
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Science

Time : 02:30:00 Hrs
Total Marks : 60

    Multiple Choice Question

    10 x 1 = 10
  1. Heat is a form of ________.

    (a)

    electrical energy

    (b)

    gravitational energy

    (c)

    thermal energy

    (d)

    None of these

  2. Conduction is the heat transfer which takes place in a____________.

    (a)

    solid

    (b)

    liquid

    (c)

    gas

    (d)

    All of them

  3. Fuse is

    (a)

    a switch

    (b)

    a wire with low resistance

    (c)

    a wire with high resistance

    (d)

    a protective device for breaking an electric circuit

  4. Aerated water contains

    (a)

    air

    (b)

    oxygen

    (c)

    carbon dioxide

    (d)

    nitrogen

  5. Carbon dioxide with water changes

    (a)

    blue litmus to red

    (b)

    red litmus to blue

    (c)

    blue litmus to yellow

    (d)

    doesn’t react with litmus

  6. In water, hydrogen and oxygen are combined in the ratio of _______by mass.

    (a)

    1:8

    (b)

    8:1

    (c)

    2:3

    (d)

    1:3

  7. Cockroach moves with the help of its

    (a)

    leg

    (b)

    bone

    (c)

    muscular foot

    (d)

    whole body

  8. Which one of the following categories of vertebrae are correctly numbered.

    (a)

    Cervical-7

    (b)

    Thoracic-10

    (c)

    Lumbar - 4

    (d)

    Sacral - 4

  9. During menstruation, the progesterone level is ___________

    (a)

    decreased

    (b)

    increased

    (c)

    ceased

    (d)

    normal

  10. Tux Math software helps in learning the ________

    (a)

    painting

    (b)

    arithmetic

    (c)

    programming

    (d)

    graphics

  11. Answer any 15 questions

    15 x 2 = 30
  12. What is conduction?

  13. Write a note on convection.

  14. Define specific heat capacity

  15. How charges are produced by friction?

  16. What is earthing?

  17. What is electric circuit?

  18. What are the sources of oxygen?.

  19. List out the uses of nitrogen

  20. Write about the reaction of nitrogen with non metals.

  21. State the law of constant proportions.

  22. Write the properties of anode rays.

  23. Write the names of the following compounds.
    a) CO b) N2O c) NO2 d) PCl5

  24. Why our backbone is slightly moveable?

  25. Define Muscle

  26. Differentiate tendons and ligament

  27. List out the changes which occur during puberty

  28. How is adolescence differ from childhood?

  29. What is the use of Text Tool?

  30. What is the shortcut key for Save option?

  31. What is Tux Math?

  32. Answer any 5 questions

    5 x 4 = 20
  33. Explain the working of thermos flask.

  34. What is electroscope? Explain how it works?

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

  36. Briefly describe the menstrual cycle.

  37. Which one of the following statements about thermal conductivity is correct? Give reason.
    a) Steel > Wood > Water
    b) Steel > Water > Wood
    c) Water > Steel > Wood
    d) Water > Wood > Steel

  38. How do astronauts breathe when they go beyond earth’s atmosphere?

  39. How can we prove that the electrons carry negative charge?

  40. What is a streamlined body? How does it help in the movement of animals that fly or swim in water?

  41. What can you suggest to your classmates to keep himself / herself clean and healthy?

  42. An iron ball requires 1000 J of heat to raise its temperature by 20°C. Calculate the heat capacity of the ball.

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