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Science questions, unit 10
Nama / NameKelas / ClassTarikh / Date

Machines

39 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 marks
Choose the best answer for each question.
1

Question 1

What are machines?
Show answerHide answer
B
Machines are tools or equipment that make our work easier and faster.
For the teacher: Remembering, low difficulty, standard 10.1.1
Textbook p. 218
2

Question 2

Diagram 1 shows a stapler joining paper. The staple that makes holes in the paper is which simple machine?
A purple stapler being pressed to join paper sheets
Diagram 1
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D
A staple is a wedge. It makes holes and joins the paper sheets.
For the teacher: Understanding, low difficulty, standard 10.1.1
Textbook p. 218
3

Question 3

Where is the fulcrum of a nail clipper?
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C
The load is at the nail and the force is at the thumb. The fulcrum is between them.
For the teacher: Remembering, low difficulty, standard 10.1.2
Textbook p. 220
4

Question 4

Which simple machine moves and turns the hands of a wristwatch?
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A
The gear in a wristwatch moves and turns the hands.
For the teacher: Understanding, low difficulty, standard 10.1.2
Textbook p. 221
5

Question 5

In a mechanical pencil sharpener, which part makes the tool easier to turn?
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B
The wheel and axle at the hand crank makes turning easier, so the wedge can sharpen the pencil.
For the teacher: Understanding, low difficulty, standard 10.1.2
Textbook p. 220
6

Question 6

Diagram 2 shows three tools, (a), (b) and (c). Which simple machine in the doorknob (b) makes it easy to turn?
Secateurs (a), a doorknob (b) and a bottle with a screw cap (c)
Diagram 2
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D
The round knob turns on an axle, so it is a wheel and axle. It is easier to turn than the thin shaft alone.
For the teacher: Applying, low difficulty, standard 10.1.2
Textbook p. 230
7

Question 7

Diagram 3 shows a bicycle that cannot be pedalled because the pedals have come off. What does this show?
A cyclist sitting by a bicycle whose pedals have come off
Diagram 3
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A
The parts must be combined so that the simple machines can work together.
For the teacher: Analysing, medium difficulty, standard 10.1.3
Textbook p. 222
8

Question 8

Which is not a characteristic of a sustainable tool?
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D
A sustainable tool has a low cost and saves money.
For the teacher: Remembering, low difficulty, standard 10.1.4
Textbook p. 225
9

Question 9

Ana's mother says a grater is a sustainable machine compared with a knife. Why?
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C
A grater simplifies work, saves time, is safer than a knife and is easy to clean.
For the teacher: Understanding, low difficulty, standard 10.1.4
Textbook p. 224
10

Question 10

Diagram 4 shows three tools for sharpening a pencil. Which tool is least safe to use?
A mechanical pencil sharpener, a pencil sharpener and a knife
Diagram 4
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C
A knife has an open sharp blade that can hurt the user, so it is less safe and less sustainable.
For the teacher: Evaluating, high difficulty, standard 10.1.4
Textbook p. 230

Section B: structured questions

29 marks
Answer all questions. Circle the answer or write it in the space.
11

Question 11

Answer these questions about a nail clipper.
[1 mark] (a)The body of a nail clipper is which simple machine?
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Lever
[1 mark] (b)The cutter that cuts the nail is which simple machine?
Show answerHide answer
Wedge
[1 mark] (c)Where is the load of a nail clipper?
Show answerHide answer
At the nail
The load is at the nail. The force is at the thumb.
For the teacher: Remembering, low difficulty, standard 10.1.2
Textbook p. 220
12

Question 12

A wristwatch has a gear, a screw and a wheel and axle.
[1 mark] (a)State the function of the gear.
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Tick each point you got.
[1 mark] (b)State the function of the screw.
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Tick each point you got.
[1 mark] (c)The wheel and axle is at the crown. What is it used for?
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Tick each point you got.
For the teacher: Understanding, low difficulty, standard 10.1.2
Textbook p. 221
13

Question 13

A pruning saw is used to cut tree branches. It has a wedge, a screw and a pulley.
[1 mark] (a)Which simple machine cuts the branch?
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Wedge
[1 mark] (b)Which simple machine pulls the wedge of the saw?
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Pulley
[1 mark] (c)What is the screw used for?
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Tick each point you got.
For the teacher: Applying, low difficulty, standard 10.1.2
Textbook p. 221
14

Question 14

Diagram 5 shows a girl who cannot use her scissors to cut the paper because the screw that joins the two blades is missing.
A girl looking at a pair of scissors that she can no longer use
Diagram 5
[1 mark] (a)Which simple machine fastens the two blades of a pair of scissors together?
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Screw
[1 mark] (b)Why can she not use the scissors now?
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Tick each point you got.
[1 mark] (c)What does this show about the combination of simple machines in a tool?
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Tick each point you got.
For the teacher: Analysing, medium difficulty, standard 10.1.3
Textbook p. 222
15

Question 15

Write three characteristics of a sustainable tool.
[1 mark] (a)Characteristic 1
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Tick each point you got.
[1 mark] (b)Characteristic 2
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Tick each point you got.
[1 mark] (c)Characteristic 3
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Tick each point you got.
For the teacher: Remembering, low difficulty, standard 10.1.4
Textbook p. 225
16

Question 16

Diagram 6 shows Ana's waste bin. It is big and heavy to push outside.
A blue waste bin with a lid
Diagram 6
[1 mark] (a)Suggest one change that makes the bin easier to take outside.
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Tick each point you got.
[1 mark] (b)The inside of the bin is divided for recyclable materials and compost. Which characteristic does this show?
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Environmentally friendly
[1 mark] (c)The bin still works well, so Ana says there is no need to buy a new one. Which characteristic does this show?
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Any 1 points
Tick each point you got.
For the teacher: Analysing, medium difficulty, standard 10.1.4
Textbook p. 226
17

Question 17

Diagram 7 shows Amir lifting heavy packages to a higher place with a simple pulley. After a while the rope on the pulley broke.
A man lifting a heavy package with a rope and a single pulley
Diagram 7
[1 mark] (a)In your opinion, why did the rope break?
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Any 1 points
Tick each point you got.
[2 marks] (b)Suggest two ways to solve the problem.
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Any 2 points
Tick each point you got.
For the teacher: Evaluating, high difficulty, standard 10.1.4
Textbook p. 230
18

Question 18

Your group is asked to design a better waste bin that has sustainable characteristics.
[2 marks] (a)Suggest two features for your design and state the characteristic each one shows.
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Any 2 points
Tick each point you got.
[2 marks] (b)Why is it important to invent tools with sustainable characteristics?
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Tick each point you got.
For the teacher: Creating, medium difficulty, standard 10.1.5
Textbook p. 226
19

Question 19

Diagram 8 shows three tools.
Secateurs (a), a doorknob (b) and a bottle with a screw cap (c)
Diagram 8
[1 mark] (a)Tool (c) is a bottle cap. Which simple machine is it?
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Screw
[1 mark] (b)Why can the cap not work if it has no spiral thread grooves?
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Tick each point you got.
[2 marks] (c)Tool (a) is a pair of secateurs. Name two simple machines in it.
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Tick each point you got.
For the teacher: Applying, low difficulty, standard 10.1.2
Textbook p. 230