Creative Questions For 8th standard Science For Second Chapter

8th Standard 2019 EM

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Science

Use Blue Pink 

Time : 02:00:00 Hrs
Total Marks : 100

    Part-A

    Multiple Choice Question

    19 x 1 = 19
  1. Electric current belongs to ______quantities

    (a)

    base

    (b)

    supplementary

    (c)

    derived

    (d)

    professional

  2. SI unit of temperature is

    (a)

    celsius

    (b)

    fahrenheit

    (c)

    kelvin

    (d)

    ampere

  3. Amount of substance is

    (a)

    directly proportional to the number of atoms

    (b)

    inversely proportional to the number of atoms

    (c)

    directly proportional to the square of number of atoms

    (d)

    inversely proportional to the square of number of atoms

  4. Luminous intensity is the intensity of

    (a)

    Laser light

    (b)

    UV light

    (c)

    visible light

    (d)

    IR light

  5. Which one of the following devices is used to measure electric current

    (a)

    (b)

    (c)

    (d)

  6. 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

  7. Mirrors having a curved reflecting surface are called as

    (a)

    plane mirrors

    (b)

    spherical mirrors

    (c)

    simple mirrors

    (d)

    None of the above

  8. The spherical mirror with a reflecting surface curved inward is called

    (a)

    convex mirror

    (b)

    concave mirror

    (c)

    curved mirror

    (d)

    None of the above

  9. The centre of a sphere of which the reflecting surface of a spherical mirror is a part is called

    (a)

    pole

    (b)

    centre of curvature

    (c)

    cradius of curvature

    (d)

    aperture

  10. The spherical mirror used as a rear view mirror in the vehicle is

    (a)

    concave mirror

    (b)

    convex mirror

    (c)

    plane mirror

    (d)

    None of the above

  11. The Pictorial symbol for water given by the alchemists was

    (a)

    (b)

    (c)

    (d)

  12. Which one of the element name not derived from planet?

    (a)

    Plutonium

    (b)

    Neptunium

    (c)

    Uranium

    (d)

    Mercury

  13. Symbol of Mercury is

    (a)

    Ag

    (b)

    Hg

    (c)

    Au

    (d)

    Pb

  14. A form of non-metal which has high ductility is

    (a)

    nitrogen

    (b)

    oxygen

    (c)

    chlorine

    (d)

    carbon

  15. Which one of metal possess low tensile strength?

    (a)

    Silver

    (b)

    Copper

    (c)

    Zinc

    (d)

    Aluminium

  16. The property which allows metals to be hammered into their sheets is ___________

    (a)

    ductility

    (b)

    malleability

    (c)

    conductivity

    (d)

    tensile strength

  17. Pencil lead contains

    (a)

    graphite

    (b)

    diamond

    (c)

    aluminium

    (d)

    sulphur

  18. Molecule ______ D. smallest unit of a substance

    (a)

    1 - A, 2 - C, 3 - B, 4 - D

    (b)

    1 - C, 2 - A, 3 - B, 4 - D

    (c)

    1 - D, 2 - C, 3 - B, 4 - A

    (d)

    1 - B, 2 - C, 3 - A, 4 - D

  19. Identify the state of matter based on the arrangement of the molecules.

    (a)

    A - gas, B - solid, C – liquid

    (b)

    A - Liquid, B - solid, C – Gas

    (c)

    A - gas, B - solid, C - liquid

    (d)

    A - Liquid, B - Gas, C - Solid

  20. Part-B

    Assertion And Reason

    2 x 2 = 4
  21. Assertion: The SI system of units is the suitable system for measurements.
    Reason: The SI unit of temperature is Kelvin.
    a. If both assertion and reason are true and reason is the correct explanation of the assertion.
    b. If both assertion and reason are true but reason is not the correct explanation of the assertion.
    c. Assertion is true, but reason is false.
    d. Assertion is false, but reason is true.

  22. Assertion: Avogadro’s number is the number of atoms in one mole of substance.
    Reason: Avogadro’s number is a constant
    a. If both assertion and reason are true and reason is the correct explanation of the assertion.
    b. If both assertion and reason are true but reason is not the correct explanation of the assertion.
    c. Assertion is true, but reason is false.
    d. Assertion is false, but reason is true.

  23. Part-C

     True or False - If False Give The Reason

    3 x 2 = 6
  24. Metals are generally good conductors of electricity, but not good conductors of heat.

    (a) True
    (b) False
  25. Gallium metal is in solid state at or just above room temperature.

    (a) True
    (b) False
  26. Compounds can be made up of one atom.

    (a) True
    (b) False
  27. Part-D

    Answer The Following Question
    6 x 2 = 12
  28. Convert 80°C into kelvin

  29. Convert 300 K into celsius.

  30. When 2 coulomb of charge, flows through a circuit for 10 seconds, calculate the current?

  31. Convert 60° into radian.

  32. What is ductility?

  33. Write the constituent elements and their symbols for the following compounds
    a) Carbon monoxide
    b) Washing soda

  34. Part-E

    Answer The Following Question

    7 x 3 = 21
  35. What are the differences between Plane angle and solid angle?

  36. What are errors?

  37. Your friend was absent yesterday. You are enquiring about his absence. He told, he was affected by a fever of 100oC and went to a hospital for treatment. Is it possible of 100oC fever? If it is wrong, try to make him to understand his mistake.

  38. Define focal length?

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

  40. Define tensile strength.

  41. Why are utensils made up of aluminium and brass?

  42. Part-F

    Answer The Following Question

    5 x 5 = 25
  43. What is reflection? Write short notes on regular and irregular reflection?

  44. Explain the working of a periscope.

  45. What is dispersion? Explain in detail.

  46. Write a short note on common human diseases caused by micro organisms.

  47. How can we improve the beneficial bacterial count in human beings?

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