Changes Around Us English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021

8th Standard

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Science

Time : 00:10:00 Hrs
Total Marks : 10

    Part A

    10 x 1 = 10
  1. The burning of matchstick is an example for chemical reaction based on______

    (a)

    Contact

    (b)

    electricity

    (c)

    light

    (d)

    catalyst

  2. The pigment responsible for browning of apples is______.

    (a)

    Hydrated iron (II) oxide

    (b)

    melanin

    (c)

    starch

    (d)

    ozone

  3. Limestone contains ______ mainly.

    (a)

    Calcium chloride

    (b)

    calcium carbonate

    (c)

    calcium nitrate

    (d)

    calcium sulphate

  4. In Haber’s process of producing ammonia ______ is used as a catalyst.

    (a)

    Nitrogen

    (b)

    hydrogen

    (c)

    iron

    (d)

    nickel

  5. ______ is responsible for Global warming.

    (a)

    Carbon di oxide

    (b)

    methane

    (c)

    chlorofluoro carbons

    (d)

    all the above

  6. Rusting of iron is a _________ change.

    (a)

    physical

    (b)

    chemical

    (c)

    physical and chemical

    (d)

    neutral

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

    (a)

    contact

    (b)

    electricity

    (c)

    light

    (d)

    heat

  8. The chemical reactions carried out by the passage of electricity is called.

    (a)

    Rusting

    (b)

    Thermolysis

    (c)

    Electrolysis

    (d)

    Photolysis

  9. Enzymes and yeasts are called

    (a)

    catalysts

    (b)

    bio catalysts

    (c)

    chemical catalysts

    (d)

    physical catalysts

  10. The brown colour of a cut apple is due to

    (a)

    rusting

    (b)

    rancidity

    (c)

    browning

    (d)

    fermentation

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