Primary 3 Science · Answers and explanations
Diversity of Materials
Use this page to check the worksheet together. Talk about why each answer is right. Total: 16 marks.
Section A · Multiple choice 5 marks
1. Which property makes a raincoat good for wet days?
(A) Transparent(B) Waterproof(C) Magnetic(D) Brittle
Answer: (B) WaterproofA waterproof material does not let water pass through.
2. Why are windows made of glass?
(A) Glass is strong and bends easily(B) Glass is transparent so light passes through(C) Glass is magnetic(D) Glass floats on water
Answer: (B) Glass is transparent so light passes throughGlass is transparent. We can see through it and light passes through.
3. Which material is the best for a towel?
(A) Plastic sheet(B) Cotton cloth(C) Glass(D) Aluminium foil
Answer: (B) Cotton clothCotton cloth absorbs water, so it dries us well.
4. A material that can be bent easily without breaking is…
(A) Rigid(B) Flexible(C) Brittle(D) Opaque
Answer: (B) FlexibleFlexible materials bend easily. Rigid materials do not bend easily.
5. Which sentence is correct?
(A) All heavy things sink(B) All light things float(C) Some heavy things float, such as a large wooden log(D) Metals always float
Answer: (C) Some heavy things float, such as a large wooden logWhether something floats depends on the material and its shape, not only on how heavy it feels. A large wooden log floats.
Section B · Fill in the blanks 5 marks
Word bank: flexible · strong · waterproof · absorbent · transparent
6. A rope is because it can hold a heavy load without breaking.
Answer: strongStrong materials can support heavy loads.
7. A sponge is because it soaks up water.
Answer: absorbentAbsorbent materials soak up liquids.
8. A rubber band is because it bends and stretches.
Answer: flexibleFlexible materials can bend or stretch easily.
9. An umbrella cover is so we stay dry.
Answer: waterproofWaterproof materials stop water going through.
10. A clear plastic bottle is , so you can see the water inside.
Answer: transparentTransparent materials let light through, so you can see clearly.
Section C · Short answers 6 marks (2 each)
11. Why is metal a good material for a cooking pot?
Model answer: It is strong and it lets heat pass through it easily. (Also accept: it does not burn easily.)Choose a material by the job it must do.
12. Give one reason why a wooden chair is better than a paper chair.
Model answer: Wood is strong and rigid, so it can hold a person. Paper is weak and soft.Strength is the key property for a chair.
13. A student tests whether a few objects float. What should the student do to make the test fair?
Model answer: Use the same container and the same amount of water, and place each object gently on the water the same way.A fair test changes one thing only, keeping the rest the same.
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