Science questions, unit 8
Nama / NameKelas / ClassTarikh / Date
Materials
34 marks. Use Practice to check each answer as you go, or Exam to answer everything first. Ask a grown-up to help you mark the written answers.
Section A: objective questions
10 marksChoose the best answer for each question.
1
Question 1
Which of these is a basic source of materials?
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B
The four basic sources are plants, animals, petroleum and rocks.
2
Question 2
Wool is used to make sweaters. What is the basic source of wool?
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D
Wool comes from sheep, which are animals.
3
Question 3
Diagram 1 shows petroleum, which is used to make plastic. Which object is made from a material with the same basic source?
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A
A raincoat is made of synthetic cloth, which comes from petroleum.
4
Question 4
Which group of materials comes only from rocks?
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C
Metal, clay and sand are obtained from rocks and soil. The other groups mix different sources.
5
Question 5
Siti drops water on four objects. The water soaks in only one of them after two minutes. Which object is it?
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B
Tissue paper absorbs water. The other objects are waterproof.
6
Question 6
Amir puts four objects into a half-full container of water. Which one floats on the water surface?
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A
A popsicle stick floats. A rock, a key and a glass cup sink.
7
Question 7
In a complete circuit the bulb lights up when a test object replaces the switch. What does this show about the object?
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D
Current only flows through a material that conducts electricity, so the bulb lights.
8
Question 8
A rubber band is stretched and then released. It goes back to its first shape. What property does it show?
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C
Elasticity is the ability to return to the original shape after being stretched.
9
Question 9
Why are cooking pots usually made of metal?
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A
Metal conducts heat, so the heat from the stove passes quickly to the food.
10
Question 10
The table shows the properties of four materials. Which material is most suitable for the handle of an electric iron, which must not get hot, must not give an electric shock and must stay dry?
| Material | Conducts heat | Conducts electricity | Absorbs water |
|---|---|---|---|
| P | Yes | Yes | No |
| Q | No | No | No |
| R | No | No | Yes |
| S | Yes | No | Yes |
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B
Material Q does not conduct heat or electricity and does not absorb water. P and S conduct heat, and R absorbs water.
Section B: structured questions
24 marksAnswer all questions. Circle the answer or write it in the space.
11
Question 11
Choose the basic source of each material.
[1 mark]
(a)Cotton
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Plants
[1 mark]
(b)Silk
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Animals
Silk is made by silkworms in their cocoon.
[1 mark]
(c)Plastic
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Petroleum
[1 mark]
(d)Sand
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Rocks
12
Question 12
A group of pupils classify these objects by their basic source: metal pot, sweater, tyre, plastic bottle.
[1 mark]
(a)Which object is made from a material from animals?
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Tick each point you got.
[2 marks]
(b)Which two objects are made from a basic source other than plants or animals?
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A tyre is made from rubber, which comes from plants.
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[1 mark]
(c)Name the basic source of the material for the tyre.
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Tick each point you got.
13
Question 13
Ali puts four objects into a half-full container of water and watches for one minute.
[2 marks]
(a)Ali tests a glass cup, a rock, popsicle sticks and a straw. Which two sink?
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Tick each point you got.
[1 mark]
(b)What property do popsicle sticks and a straw show in water?
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Tick each point you got.
14
Question 14
Mei builds a circuit with a bulb and tests four objects in place of the switch. The bulb lights up with the coin and the aluminium foil. It does not light up with the plastic ruler and the leather string.
[2 marks]
(a)Which objects conduct electricity?
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Tick each point you got.
[1 mark]
(b)Why does the bulb not light up with the plastic ruler?
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Tick each point you got.
[1 mark]
(c)State one thing that must be done to make this a fair test.
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15
Question 15
Hot water is poured into an aquarium. Aluminium foil and polystyrene are attached to a skewer and soaked for two minutes.
[1 mark]
(a)Which material feels warm when touched at the top end?
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Aluminium foil
[1 mark]
(b)What property does this material have?
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Tick each point you got.
[1 mark]
(c)Why is the handle of a cooking pot made of plastic or wood?
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Tick each point you got.
16
Question 16
Give the property that makes each material suitable for its use.
[1 mark]
(a)A raincoat is made of synthetic cloth. State the property that makes it suitable.
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Tick each point you got.
[1 mark]
(b)A toy car moves using a rubber band. Which property of the rubber band is used?
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Elastic
[1 mark]
(c)Explain why a window is made of glass.
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Tick each point you got.
17
Question 17
A pupil wants to make a lamp shade from used materials.
[1 mark]
(a)Give one material that light can pass through.
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Tick each point you got.
[2 marks]
(b)Why is it important to choose the type of material carefully when making an object?
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Tick each point you got.