Hands-on Science Workbook Primary 4 (Chapter 02)

Chapter Light

2

2.1 Properties of Light

1 Tick (✓) the situation in which the pupil can see the light of a candle through the
tube.
(a) (b)

(c) (d)

2 Fill in the blanks with the correct answer.

(a) We can see a beam of from

the van at night. The beam of light shows

that light travels in a line.

(b) When light rays hits a Light ray
mirror, the light rays will be
in the same direction. Mirror

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Hands-on Science

3 The diagram below shows that Ali can see the light through the holes. Answer
all the questions.

Cardboards with hole

Ali Lighted
candle

(a) (i) What happens when one of the cardboards is shifted to one side?

(ii) Explain why.

(b) (i) Can this activity be done using clear glass instead of the
cardboards?

(ii) Explain why.


2.2 Shadows

4 Fill in the blanks and complete the table below.

Object Properties Example
Air
Transparent (a) 

(b)  Light cannot pass through it. Wood

Translucent Some light can pass through it.
(c) 

Chapter 2 9
Light

5 Give three examples each for transparent, translucent and opaque objects in
the table below.
(a)  Transparent object (b)  Translucent object (c)  Opaque object

6 The diagram shows a pupil producing a shadow with his hands. Complete the
sentences below.

(a) The hands of the pupil are in order to produce the shadows.

(b) A shadow is formed when an object blocks the .

(c) The shadow formed has the shape as the object.

(d) The shadow is dark because there is light falling on that
area.

(e) A object will not make any shadow, as light will pass
through it.

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Hands-on Science

Objective Questions

Choose the best answer.

1 What is the most important source 3 The diagram below shows a ray of
of light? light falling on a book.

A Fire B Moon

C Sun D Stars

2 The activity below shows a pupil
using tubes P, Q, R and S to view
the candle. Which tube enables What happens to the light after
the pupil to see the candle? falling on the book? It is

P A reflected B refracted

Q C dispersed D absorbed

4 Why can a mirror reflect all the
light rays perfectly?
A It has a small surface.
B It has a smooth surface.
C It has a rough surface.
D It has a large surface.

R 5 Which of the following objects
apply the reflection of light
S properties in their uses?
I Mirror
A P B Q II Rear view mirror
C R D S III Periscope
IV Mouth mirror
A I and II
B III and IV
C II, III and IV
D I, II, III and IV

Chapter 2 11
Light

6 The diagram below shows the What could object X be?
observation of an activity. A Tracing paper
B Frosted glass
Vase C Clear glass
D Wooden block

Torch 8 Which of the following is true about
opaque objects?
What can you conclude from the A They allow some light to pass
activity? through them.
I Light travels in a straight line. B They do not allow light to pass
II Light travels very fast. through them.
III Light cannot pass through C Water and clear plastic are
opaque objects. opaque to light.
IV Light travels through opaque D Shadows cannot be formed
objects. when light shines on opaque
A I and II objects.
B I and III
C II and IV 9 Which of the following is a
D III and IV translucent object?
A Laptop
7 An activity is carried out to study B Wax
if light can pass through object X. C Air
The result is shown below. D Pillow

Light 10 What happens to the shadow
when an object is moved closer to
Object X the light source? It
A becomes bigger
B becomes smaller
C stays the same size
D changes its shape

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Hands-on Science

Subjective Questions
Answer all the questions below.
1 The pictures below show a lighthouse and a car in the dark.


(a) From the pictures above, what can you conclude about how light travels?


(b) What is the function of the light from the
(i) lighthouse?


(ii) car?



(c) Name one example of a light source that uses this property of light.


Chapter 2 13
Light

2 Answer all the questions based on the pictures below.

B

A C

(a) What is the function of
(i) A?

(ii) B ?

(iii) C ?


(b) What is the property of light applied in A, B and C ?


(c) The picture below shows the interior of a periscope. Draw where the two
mirrors are located inside the periscope. Then, draw the light pathway
inside the periscope so that images can be seen. Label your drawing.

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Hands-on Science

3 A pupil carried out an activity. Study the diagram below.

Pupil Lighted
Cardboard candle

(a) Can the pupil see the lighted candle through the cardboard?



(b) Explain your answer in (a).



(c) What can replace the cardboard for the pupil to see the lighted candle?



(d) Explain your answer in (c).



4 Give a term to describe each of the following:
(a) An object that allows almost all light to pass through it.


(b) An object that allows only a little light to pass through it.


(c) An object that does not allow light to pass through it at all.



Chapter 2 15
Light

5 An activity is carried out by a group of pupils where they shine a torchlight on
a book, a magnifying glass and a tinted glass. The observations are recorded
in the table below.

Object used Observation
Book Light cannot pass through

Magnifying glass Light passed through

Tinted glass Some light passed through

(a) What is the aim of the activity?



(b) Which object will produce a dark shadow, a faint shadow or no shadow at
all?

Shadow Object

Dark shadow (i)

Faint shadow (ii)
No shadow (iii)

(c) Categorize the objects used.

Opaque Translucent Transparent
(iii)
(i) (ii)

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Hands-on Science