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Science questions, unit 5
Nama / NameKelas / ClassTarikh / Date

Properties of light

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

Which of these is not a property of light?
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D
The three properties are: travels in a straight line, can be reflected and can be refracted.
For the teacher: Remembering, low difficulty, standard 5.1.1
Textbook p. 88
2

Question 2

Diagram 1 shows rays of sunlight in a forest. What does this show about light?
Straight rays of sunlight shining between tree trunks in a forest
Diagram 1
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A
The sunlight rays are straight, so light travels in a straight line.
For the teacher: Understanding, low difficulty, standard 5.1.1
Textbook p. 88
3

Question 3

Which object allows all the light to pass through it?
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B
Clear plastic is transparent. It allows all the light to pass through.
For the teacher: Remembering, low difficulty, standard 5.1.2
Textbook p. 91
4

Question 4

A shadow of a coloured plastic butterfly is less clear than that of a manila card butterfly. Why?
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C
A translucent object lets some light through, so the shadow is less clear. An opaque object blocks all the light.
For the teacher: Understanding, low difficulty, standard 5.1.2
Textbook p. 91
5

Question 5

Siti moves a torch closer to a toy. What happens to the size of the shadow of the toy on the wall?
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B
The shorter the distance between the light source and the object, the larger the shadow.
For the teacher: Applying, low difficulty, standard 5.1.3
Textbook p. 92
6

Question 6

Which pair of factors can change the shape of a shadow?
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A
The orientation of the object and the position of the light source change the shape of a shadow.
For the teacher: Understanding, medium difficulty, standard 5.1.4
Textbook p. 93
7

Question 7

Why does the moon look bright at night?
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C
The moon is not a source of light. It reflects sunlight towards the Earth.
For the teacher: Understanding, low difficulty, standard 5.2.1
Textbook p. 95
8

Question 8

Diagram 2 shows a periscope used in a submarine. Why does it have two mirrors?
A periscope with two mirrors on a submarine and a dashed line showing the path of light
Diagram 2
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D
The two mirrors reflect the light from an object that is blocked from view to the observer's eyes.
For the teacher: Applying, medium difficulty, standard 5.2.2
Textbook p. 97
9

Question 9

A spoon in a glass of water looks bent. Which property of light causes this?
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B
Light from the spoon changes direction when it goes from water to air. This is refraction.
For the teacher: Remembering, low difficulty, standard 5.3.1
Textbook p. 100
10

Question 10

A hand lens magnifies a small insect. This is possible because light can be
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C
The hand lens refracts light, which makes the object look bigger.
For the teacher: Understanding, low difficulty, standard 5.3.4
Textbook p. 104

Section B: structured questions

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

Question 11

Ali arranges a torch, three cardboards with slits and a screen. Diagram 3 shows what he sees. Diagram 4 shows what he sees when he moves the middle cardboard up.
Slits in a straight line and light reaching the screen
Diagram 3
Slits not in a straight line and no light on the screen
Diagram 4
[1 mark] (a)In which diagram does light reach the screen?
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Diagram 3
[2 marks] (b)Explain why there is no light on the screen in Diagram 4.
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Tick each point you got.
[1 mark] (c)State the property of light that this investigation shows.
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Tick each point you got.
For the teacher: Applying, low difficulty, standard 5.1.1
Textbook p. 89
12

Question 12

Match each object with how clear its shadow is. Choose from: no shadow, less clear shadow, clear shadow.
[1 mark] (a)Manila card (opaque)
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Clear shadow
[1 mark] (b)Coloured plastic (translucent)
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Less clear shadow
[1 mark] (c)Clear plastic (transparent)
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No shadow
[1 mark] (d)Give one reason why the shadow of the manila card is the clearest.
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Tick each point you got.
For the teacher: Understanding, low difficulty, standard 5.1.2
Textbook p. 91
13

Question 13

Year 4 pupils investigate the size of a shadow. They move a torch to different distances from a cylinder, with the cylinder always 20 cm from the screen. Diagram 5 shows the set-up. Table 1 shows the results.
Table 1
Distance of torch from cylinder (cm)Size of shadow (cm)
1012
208
406
A torch, an object and a screen with a shadow
Diagram 5
[1 mark] (a)How can the pupils make the shadow larger?
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Tick each point you got.
[1 mark] (b)State the manipulated variable.
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Tick each point you got.
[1 mark] (c)State one constant variable.
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Tick each point you got.
[2 marks] (d)Write the conclusion.
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Tick each point you got.
For the teacher: Analysing, medium difficulty, standard 5.1.3
Textbook p. 92
14

Question 14

A road has a sharp bend. A convex mirror is put at the bend so that drivers can see vehicles coming round it.
[1 mark] (a)Which property of light is used in the convex mirror?
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Light is reflected
[1 mark] (b)State the use of the convex mirror at the bend.
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Tick each point you got.
[1 mark] (c)Name one other device that uses mirrors to see an object that is blocked from view.
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Tick each point you got.
For the teacher: Applying, low difficulty, standard 5.2.2
Textbook p. 96
15

Question 15

Diagram 6 shows a ray of light shining onto a mirror.
A mirror with a ray of light coming down onto it and no reflected ray
Diagram 6
[2 marks] (a)Draw the reflected ray in Diagram 6. Use a ruler and put an arrow on the ray.
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Tick each point you got.
[1 mark] (b)Why must a ruler be used?
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Tick each point you got.
For the teacher: Applying, low difficulty, standard 5.2.3
Textbook p. 98
16

Question 16

Diagram 7 shows a ray of light going from air into water. Ravi says, "The spoon in the water is bent."
A ray of light going from air into water and bending at the surface
Diagram 7
[1 mark] (a)What happens to the direction of the light when it goes from air into water?
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Tick each point you got.
[1 mark] (b)Name this property of light.
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Tick each point you got.
[2 marks] (c)Is Ravi correct? Give a reason.
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Tick each point you got.
[2 marks] (d)How is a rainbow formed?
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Tick each point you got.
For the teacher: Understanding, medium difficulty, standard 5.3.1
Textbook p. 100
17

Question 17

Sara says, "If light could not be reflected, we could not see our face in a mirror."
[2 marks] (a)Explain why Sara is correct.
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Tick each point you got.
[2 marks] (b)Name one device that uses the property of refraction, and state its use.
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Tick each point you got.
For the teacher: Creating, high difficulty, standard 5.3.4
Textbook p. 104