(a) Which method of sending mail takes the shortest time?
(b) Predict the method that u mentioned in (a).
(c) State the following belows:
i) What is changed :
ii) What is measured :
(d) State the aim of the investigation above?
2. Diagran above show two nails in a beaker placed in wet area.
(a) Which nail is going to rust?
(b) Give a reason (inference) for your answer in (a).
(c) In this investigation, state what should be kept the same.
(d) Suggest two methods that can be used to prevent rusting.
i.
ii.
3. Four materials J, K, L and M, of the same size are immersed in separate beakers, each containing 100 ml of water for 10 minutes. The table below shows the final amount of water each materials is taken out from beaker.
(a) What is the purpose (aim) of the investigation?
( b) Which materials is the most absorbent object?
(c) Give a reason (inference) for yopur answer in (b)
(d) Predict the materials that can be used to make these objects.
4. Diagram below shows three objects used to compared the size of the Sun, the Earth and the Moon ia a simulation.
(a) What do the objects represent?
i. The glass marble :
ii. The basketball :
iii. The grain of sago :
(b) What is the relative size of the moon to the size of the Earth and the size of the Sun?
(c) All the planets moves around the Sun in thier own orbit. State the relationship between the size of orbit of the planet and the time taken for the planet to complete the movement around the Sun.
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