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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

12 marks
Choose the best answer for each question.
1

Question 1

Which are the three parts of a lever?
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B
A lever has a load, a fulcrum and a force.
For the teacher: Remembering, low difficulty, standard 10.1.1
Textbook p. 170
2

Question 2

Which tool is a wheel and axle?
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D
A door knob is a wheel fixed on a rod called an axle. A broom is a lever, a bottle cap is a screw and stairs are an inclined plane.
For the teacher: Remembering, low difficulty, standard 10.2.1
Textbook p. 174
3

Question 3

Siva uses a screwdriver to open the lid of a paint can. Which part of the lever is the lid?
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A
The lid is the object that is moved, so it is the load. The tip of the screwdriver is the fulcrum and the hand gives the force.
For the teacher: Understanding, low difficulty, standard 10.1.2
Textbook p. 170
4

Question 4

Which statement is correct about a lever?
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C
A load near the fulcrum needs less force to lift.
For the teacher: Understanding, low difficulty, standard 10.1.3
Textbook p. 172
5

Question 5

A knife is an example of which simple machine?
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B
A wedge has a pointed end and is used to cut, hold or stop an object.
For the teacher: Remembering, low difficulty, standard 10.2.1
Textbook p. 175
6

Question 6

Teruni's father places a tilted board at the back of a lorry to load boxes. Which simple machine is the tilted board?
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A
A tilted flat surface with ends at different heights is an inclined plane.
For the teacher: Understanding, low difficulty, standard 10.2.2
Textbook p. 177
7

Question 7

Diagram 1 shows boxes moved into a lorry. A trolley is used to move the boxes faster. Which simple machine is the trolley?
A girl and her father with a lorry; a tilted board and a trolley help move boxes
Diagram 1
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D
The trolley has wheels fixed on axles, so it is a wheel and axle.
For the teacher: Applying, medium difficulty, standard 10.2.2
Textbook p. 177
8

Question 8

What is a screw used for?
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C
A screw is turned into an object to join or tighten two parts.
For the teacher: Remembering, low difficulty, standard 10.2.1
Textbook p. 174
9

Question 9

Diagram 2 shows a wheelbarrow, which is a lever. How can the gardener lift the load with less force?
A wheelbarrow with the load in the tray, the force at the handles and the fulcrum at the wheel
Diagram 2
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A
The wheel is the fulcrum. A load nearer to the fulcrum needs less force.
For the teacher: Applying, medium difficulty, standard 10.1.3
Textbook p. 172
10

Question 10

The window blinds in the classroom are pulled up with a rope that passes over a grooved wheel. Which simple machine is this?
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C
A pulley is a grooved wheel that lets a rope pass through it to lift or lower a load.
For the teacher: Remembering, low difficulty, standard 10.2.1
Textbook p. 175
11

Question 11

Which is a characteristic of a sustainable machine?
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D
A sustainable machine is durable, profitable, easy and safe to use, and does not harm the environment.
For the teacher: Understanding, low difficulty, standard 10.2.4
Textbook p. 181
12

Question 12

Which tool is a complex machine?
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B
A bicycle is made of several simple machines, such as gears, screws and wheels and axles. The others are single simple machines.
For the teacher: Understanding, low difficulty, standard 10.2.3
Textbook p. 180

Section B: structured questions

27 marks
Answer all questions. Circle the answer or write it in the space.
13

Question 13

Siva uses a screwdriver as a lever to open the lid of a paint can.
[1 mark] (a)What is the load?
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Tick each point you got.
[1 mark] (b)What is the fulcrum?
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Tick each point you got.
[1 mark] (c)What gives the force?
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Tick each point you got.
For the teacher: Understanding, low difficulty, standard 10.1.2
Textbook p. 170
14

Question 14

Ravi lifts a wooden block with a ruler. He puts the fulcrum triangle 25 cm, 20 cm and then 15 cm from the block and compares the force needed.
[1 mark] (a)What is the manipulated variable?
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Tick each point you got.
[1 mark] (b)What is the responding variable?
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Tick each point you got.
[1 mark] (c)State one constant variable.
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[1 mark] (d)At which distance is the block easiest to lift?
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15 cm
The fulcrum is closest to the block, so the least force is needed.
[1 mark] (e)Write a conclusion.
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Tick each point you got.
For the teacher: Analysing, medium difficulty, standard 10.1.3
Textbook p. 173
15

Question 15

Name the simple machine in each tool.
[1 mark] (a)Door knob
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Wheel and axle
[1 mark] (b)Gears in a clock are an example of a
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Gear
[1 mark] (c)Stairs
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Inclined plane
[1 mark] (d)Broom
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Lever
[1 mark] (e)Bottle and its cap
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Screw
[1 mark] (f)Doorstop
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Wedge
For the teacher: Remembering, low difficulty, standard 10.2.1
Textbook p. 174
16

Question 16

Teruni's father cannot lift heavy boxes into the lorry in Diagram 3.
A girl and her father with a lorry; a tilted board and a trolley help move boxes
Diagram 3
[1 mark] (a)Name the simple machine that is a tilted board.
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Tick each point you got.
[1 mark] (b)Name the simple machine that is a trolley.
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[2 marks] (c)What happens to the work when more simple machines are used?
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Tick each point you got.
For the teacher: Applying, low difficulty, standard 10.2.2
Textbook p. 177
17

Question 17

Diagram 4 shows a wheelbarrow.
A wheelbarrow with load, force and fulcrum shown
Diagram 4
[1 mark] (a)What is a complex machine?
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Tick each point you got.
[2 marks] (b)Name two simple machines in a wheelbarrow.
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Any 2 points
Tick each point you got.
For the teacher: Understanding, medium difficulty, standard 10.2.3
Textbook p. 180
18

Question 18

A family needs to paint the high walls of their house.
[2 marks] (a)Suggest two simple machines that can make the work easier and say how each helps.
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Any 2 points
Tick each point you got.
[1 mark] (b)Hana has a ruler and a rubber. Can she lift a textbook using a lever? Explain.
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Tick each point you got.
For the teacher: Creating, high difficulty, standard 10.2.2
Textbook p. 178
19

Question 19

Aini says a bicycle is a better sustainable machine than a motorcycle.
[2 marks] (a)State two characteristics of a sustainable machine.
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Any 2 points
Tick each point you got.
[1 mark] (b)Do you agree with Aini? Give a reason.
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Tick each point you got.
For the teacher: Evaluating, medium difficulty, standard 10.2.4
Textbook p. 181