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  1. A is a tennis ball, B is a basketball, C is an iron ball and D is a ping-pong ball. Their masses were measured using a lever balance. Arrange A, B, C and D according to their masses, from the smallest to the biggest.



    2. Your answer:

  2. What are the factors that affect the rate of evaporation of water?


    3. Your answer:

  3. Jim put a laboratory thermometer into a beaker of ice cubes and heated it continuously until bubbles were seen in the beaker. After a while, a white 'cloud' was seen at the mouth of the beaker. Jim recorded the temperature of the water and plotted a graph as shown below.


    (a) Which part of the graph shows a gain in heat? Tick ( √ ) the correct boxes).


    (b) Jim allowed the beaker of water to cool down. Which part of the graph showed that Jim switched off the flame? Tick ( √ ) in the correct box.



    4. Your answer:

  4. Four metal bars A, B, C and D are hung from a rod as shown below. The north pole of a bar magnet is brought near X, and then Y, of each metal bar.



    The table below shows the observations made during the experiment.



    Metal Bar

    A

    B

    C

    D

    Observations

    North Pole and X

    North Pole and Y

    repelled

    attracted

    nothing happened

    nothing happened

    attracted

    attracted

    attracted

    repelled

    (a) Which of the metal bars are magnets?

    ______________________________________


    (b) Explain your choice in (a).

    ______________________________________


    (c) Which one of the metal bars is not a magnet but made of iron?


    5. Your answer:

  5. Study the following food chains carefully. The arrows in every food chain show the flow of energy from 1 organism to the other.
    Maize → Chicken → Fox
    Grass → Cow → Tiger
    Sea grass → Fish → Man
    a) Maize, grass and sea grass are known as food producers. How do they get food?
    Ans:_______________
    b) The chicken, cow, fish fox, tiger and Man are known as food consumers. They do not make food. They get the energy from eating other animals and plants. Based only on the diagrams above, which group-food producers or food consumers will be present on Earth in greater number? Explain your answer.
    Ans:_______________

    6. Your answer:

  6. Fill in the blanks below with the most suitable answer from the box:
    Skull Rib cage Arm bone Thigh bone



    7. Your answer:

  7. Sue conducted several test on materials, A, B, C and D, and tabulated her results below.
    Properties A B C D

    ability to stretch

    no

    yes

    no

    yes

    breaks easily

    when dropped

    yes

    no

    no

    no

    waterproof

    yes

    yes

    yes

    no


    (a) What material could Sue use to make a swimming cap which can keep her hair dry?

    (b) Could Sue give a toy made of material A to a baby?

    (c) Give a reason for your answer in (b).


    8. Your answer:

  8. The pictures below show the different stages in the growth of a seed.
    (a) At which of the above stages would sunlight not be important?
    (b) Why would sunlight not be needed?
    (c) State the conditions needed for the seed to develop into stage B?

    9. Your answer:

  9. rubber ball mineral water milk water vapour bottle

    Study the things listed in the box above. Classify them in the table below.

    Properties

    Definite shape

    No definite shape

    Definite volume

    No definite volume


    10. Your answer:

  10. The "pulling" distance of a magnet is the furthest distance from which it is able to attract a magnetic object. Elaine carried out an investigation to find out the "pulling" distance of 3 different types of magnets.

    She recorded the "pulling" distance of the different magnets in the table below.

    Results:

    Magnet

    "Pulling" Distance (cm)

    Bar Magnet

    2.9

    Ring Magnet

    0.8

    U-shaped magnet

    1.7


    (a) List the magnets according to their strengths, from the weakest to the strongest. [1]

    ____________________________________________________________

    (Weakest) (Strongest)

    (b) State the relationship between the strength of the magnetic force and the pulling distance of the magnets. [1]

    ______________________________


    11. Your answer:

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