for grade 4 learners

1. SCIENCE 4
Investigating Properties and
Characteristics of Light and
Sound
QUARTER 3 WEEK 8
D
A
Y
1

2. Drill/Review
Fill in the blanks.
1. _______________ is the main source of light on
earth.
2. Light travels in a _______________ lines.
3. An _______________ can be seen in a shiny
surface when light is reflected.
4. _______________ is when light bounces off an
object.
5. _______________ is the bending of light as it
travels from one type of material
to another.

3. Motivation
Find the following words in the table.
Draw a line to connect the letters of the word that
you find.
Echo loud vibrations soft sound

4. Motivation
E C H O E S L A S A
D F V S O U N D T R
S O F T Y N O I S E
V I B R A T I O N S
C H A R L O U D N E
R I A N O W B I J M

5. Presentation
Do the activity
1. Place a ruler over the end of a
table.
2. Strike the ruler so it vibrates.
3. Move the ruler so there is less in contact
with the table.
4. Strike the ruler again. What happens?

6. Presentation

7. Discussion
Questions:
1.What happened to the ruler when you
suddenly released it?
2. How do you describe the movement of the
ruler?
3. Did you hear a sound?

8. Discussion
4. Did the sound coming from the moving ruler
suddenly stop when you hold it?
5. Was there a sound coming from the moving
ruler when you released it again?

9. Activity 1
Write TRUE if the statement is correct and
FALSE if it is wrong.
1.Echo is the term used for the sound that is
reflected to its source.
2. Bats and dolphins used echolocation to
locate their food and determine their
directions.

10. Activity 1
3. Only animals have the ability to use
echolocation.
4. The sea floor is mapped using
echolocation.
5. Some individuals have developed to use
echolocation and thus able to see even if
they are blind.

11. Activity 2
Read each item carefully. Choose the letter of the
correct answer.
1.Light travels in a ___ line when is passes through a
single medium.
A. curved B. straight C. crooked D. dotted
2. When the sound travels through solids, the vibration
of the particles occurs ____?
A. fast B. slowly C. moderately D. irregularly

12. Activity 2
3.What affects the speed of sound as it travels?
A. Person receiving it
B. The origin of the sound
C. The nature of material
D. Loudness of the sound

13. Activity 2
4. What is the direction of the hear transfer?
A. From hot to cold
B. From cold to hot
C. From bottom to top
D. From side to side

14. Activity 2
5. How is heat transferred in solid materilas?
A. Through convection
B. Through conduction
C. Through radiation
D. Through vaccum

15. Application
Answer the questions briefly.
1.Why do fire trucks and ambulance sirens
create loud sounds?
2. Why are lullabies advisable to use when we
want babies to sleep well rather than rock
music?

16. Generalization
Too much or too little light, sound, and heat can have
harmful effects to your health.
Light, heat, and sound help us perform our daily
activities.
Over illumination is the use of too much artificial light
in an activity. It can lead to light pollution.
Noise is aloud, unpleasant, and unwanted sound.
There are many heat-related illnesses, some of which
lead to heat stroke, which is a life-threatening
condition.

17. Assessment
Read each item carefully. Choose the letter
of the correct answer.
1.In which medium can sound wave travel
faster?
A. solids
B. liquids
C. gases
D. all of these

18. Assessment
2. What kind of light travels from one medium to
another?
A. refraction
B. reflection and refraction
C. reflection
D. All of the above

19. Assessment
3. When does the light is refracted?
A. When light travels in a straight line
B. When light is bounced.
C. When light cannot pass through an opaque
object.
D. When light travels in a straight line.

20. Assessment
4. Which of the following statements is true?
A. Light always travel in a straight line.
B. Sound travels faster in air that in solids.
C. Heat transfer through liquid is known as
radiation.
D. Sound cannot travel through the air.

21. Assessment
5. Which of the following materials can be used
to protect ourselves from excessive heat and
light?
A. perfume
B. hat
C. bracelet
D. headband

22. SCIENCE 4
Investigating Properties and
Characteristics of Light and
Sound
QUARTER 3 WEEK 8
D
A
Y
2

23. Drill/Review
Write True if the sentence is correct and False if it is
wrong.
_____ 1. The sun makes its own light.
_____ 2. Sound loses strength as it spreads outward
in all directions from the
source.
_____ 3. Volume refers to the loudness and
softness of sound.

24. Drill/Review
_____ 4. Soft sound is produced when an
object vibrates fast.
_____ 5. The echo is the sound that is
reflected or returned.

25. Motivation
If an object gives off sound, draw arrows showing
the sound.

26. Presentation
Make a Rainbow
What to do
1.Take the glass of water and paper to a part of the
room with enough sunlight (near a window is good).
2. Hold the glass of water above the paper and
watch as sunlight passes through it, refracts (bends),
and forms a rainbow of colors on your sheet of paper.
3. Try holding the glass of water at different heights
and angles to see if it has a different effect.
4. Draw and color your observations.

27. Discussion
Questions:
1.What do you see on the paper when the glass
of water was exposed to sunlight?
2. What do you think caused the sunlight to
refract or bend?

28. Discussion
3. What was the effect when the bottle was held
at different heights and angles? What does this
show?
4. What may happen when light passes through a
glass of water?

29. Activity 1
Fill in the blanks with words from the flashlight to
complete the sentences below.
Light travels in ____ lines from ____ of light thst
bounced off sn object. We can see the object
because the ____ eneters our eyes.

30. Activity 1
Wood and cardboard are ____ materials that light
cannot travel through ____ is a ____ materials that
allows light to pass through, ____ is a ____ materials
that allows light to pass through. Tissue paper is ____
which will let some light through.

31. Activity 1
When the object blocks out the ____ a ____ is formed.
Shadows are ____ midday and ____ at the beginning
and end of the day.

32. Activity 2
Read the following statements. Write T if it is True and
F if it is False.
___1.Light moves in a straight line.
___ 2. Light energy can also generate heat energy.
___ 3. The more light that an object absorbs, the less
it will reflect.
___ 4. Light is a beam of energy that moves in a
wave.
___ 5. Light behaves like a wave and group of
particles.

33. Application
Answer the questions briefly.
1.Staying too long under sunlight may
damage our skin due to the radiation. What
must we do to protect our skin from being
hurt by the heat of the sun?
2.Why is it not advisable to point a laser light
toy to the eyes of a person?

34. Generalization
Too much or too little light, sound, and heat can
have harmful effects to your health.
Light, heat, and sound help us perform our daily
activities.
Over illumination is the use of too much artificial
light in an activity. It can lead to light pollution.

35. Generalization
Noise is aloud, unpleasant, and unwanted
sound.
There are many heat-related illnesses, some of
which lead to heat stroke, which is a life-
threatening condition.

36. Assessment
Write True if the statement is correct and False if
the statement is incorrect.
____ 1. Light can be reflected if it is directed
towards a mirror.
____ 2. The speed of light remains the same even
if it travels from one material to another.

37. Assessment
____ 3. Sound could be either soft or loud.
____ 4. The loudness of sound decreases as it
moves nearer the observer.
____ 5. Echo is the term used for the sound that is
reflected back to its source.

38. SCIENCE 4
Investigating Properties and
Characteristics of Light and
Sound
QUARTER 3 WEEK 8
D
A
Y
3

39. Drill/Review
Draw a happy face if the statement is
correct and draw a sad face if it is wrong.
_____ 1. The light will be able to pass
through when blocked with thick
cardboard.
_____ 2. Heat travels in air and water by
convection.

40. Drill/Review
happen if the light used by big buses or
other modes of
transportation was placed on the sides of
the vehicle.
_____ 4. Optical fibers are used in
communication, medicine, and industry.

41. Drill/Review
_____ 5. A sound wave travels at a different
speed through different media.

42. Motivation
Perform the activity and answer the questions that
follow.
Place your one ear on the table and cover your
other ear with your finger. Gently tap the table.
1.Did you hear the sound?
2. Try tapping farther away. Can you still hear it?
3. How has the sound travelled from where you
tapped on the table to your ear?

43. Presentation
Perform the following activities and answer the
questions that follow.
A. Play lively music.
B. Set the volume to a distance away from the
music.
C. Slowly move to a distance away from the
music.
1.Was the music loud enough to be heard at the
starting point distance?

44. Presentation
2. Were you still able to hear the sound clearly at
the farthest distance you set?
3. What happens with the loudness of the music
as you increase your distance away from the
source?
4. If you continue to move away from the source
of the music, will you be able to hear it clearly
and loudly?

45. Activity 1
Write LOUD on the blank if the activity
produces loud sounds, and SOFT it is soft.
___ 1. Car blowing its horn.
___ 2. Endless barking of a dog.
___ 3. Pupils talking altogether at the same
time inside the classroom.

46. Activity 1
___ 4. Whisper around a sleeping baby.
___ 5. Give an all-out shout when your favorite
basketball player scored.

47. Activity 2
Pick out the correct words in to complete the
sentences below.
Low pitch waves high pitch
Back-and-forth sound
1.____ is made by vibrations.
2. Vibrations happen when something moves ____
quickly.

48. Activity 2
Pick out the correct words in to complete the
sentences below.
Low pitch waves high pitch
Back-and-forth sound
3. Sound ____ travel through the air.
4. When sound waves are fast, the sound was ____.
5. When sound waves are slow, the sound has ____.

49. Activity 3
Match Column A with Column B.
A
1.Tells how high or low a sound is ___.
2. Type of energy made by vibrations ___.
3. The softness or loudness of sound ___.

50. Activity 3
4. 5.
B
B
A. High pitch
B. Volume
C.Pitch
D. Low pitch
E. Sound

51. Application
Answer the questions briefly.
1.Two of your friends made a sound. One
strongly tapped the table while the other
clapped his hands in the air. Which sound
would you hear first? Justify your answer.

52. Application
2. If light coming out from a source like
flashlight travel in a zigzag manner instead of
a straight line, is it possible to focus on a
specific object?

53. Generalization
Too much or too little light, sound, and heat can
have harmful effects to your health.
Light, heat, and sound help us perform our daily
activities.
Over illumination is the use of too much artificial
light in an activity. It can lead to light pollution.

54. Generalization
Noise is aloud, unpleasant, and unwanted
sound.
There are many heat-related illnesses, some of
which lead to heat stroke, which is a life-
threatening condition.

55. Assessment
Encircle the letter of the correct answer.
1.Which of the following produces a soft
sound?
A. drum set
B. whistle
C. Jet
D. buzzing bee

56. Assessment
2. Which of the following produces the loudest
sound?
A. jet
B. piano
C. telephone
D. cry of a baby

57. Assessment
3. Why does sound become weaker or fainter as
it moves away from the observer?
A. The sound is lowered by the operator.
B. The sound spreads to cover a smaller area.
C. The sound spreads to cover a larger area.
D. The sound is already absorbed by the
environment.

58. Assessment
4. Which pair of words is true?
A. flute: loudest sound
B. cricket: no sound
C. whisper: soft sound
D. ambulance siren: soft sound

59. Assessment
5. Which is TRUE about the characteristics of
sound?
A. Sound could either be soft or loud.
B. The loudness of sound decreases as it moves
nearer the observer.
C. Sound is not heard when it is exactly on the
same spot as the listener.
D. The loudness of sound increases as it moves
away from the observer.

60. SCIENCE 4
Investigating Properties and
Characteristics of Light and
Sound
QUARTER 3 WEEK 8
D
A
Y
4

61. Drill/Review
Summative Test 4

62. Motivation
Identify if heat, light, or sound.

63. Presentation
Conduct an experiment on the effect of too much
and too little light on plants. Have three seedlings of
the same variety and mark them as A, B, and C.
Place Plant a under normal growth conditions
(placed in a natural setting where there is natural
light).
Plant B will also be placed under normal growth
conditions except at night when it will be subjected
to artificial light.

64. Presentation
Plant C will be subjected to normal growth
conditions for only six hours each day. It will be
placed in an area where there is no available light
for the remaining 18 hours.
All plants will be watered daily. Observe their
appearances daily. Weekly, record their heights
and take note of the growth of new branches,
flowers, and fruits.
Continue the experiment until enough data are
gathered for you to make a conclusion.

65. Activity 1
Check (/) the healthful practices to protect
yourself from too much heat, light, and sound
and cross out (x) the unhealthful practices.
___ 1. Use an umbrella or a wide-brimmed hat
when you go outside the house at noontime on
sunny days.

66. Activity 1
___ 2. Stay away from construction sites that use
big machines.
___ 3. Wear thin, light colored and cottony
clothes on sunny days.
___ 4. Bring a bottle of water when traveling on
sunny days.
___ 5. Minimize the volume of amplifiers or
speakers when listening to music at home.

67. Activity 2
Write TRUE if healthful practices to protect
yourself from too much heat, light, and sound
and FALSE if unhealthful practices.
___ 1. Avoid playing at the playground between
10:00 in the morning to 4:00 in the afternoon on
sunny days.

68. Activity 2
___ 2. Control the volume of headphones
or earphones while listening on the
mobile phone or computer.
___ 3. Watch construction workers drill
holes on cemented roads.

69. Activity 2
___ 4. Enjoy watching rock concerts every
evening.
___5. Go biking with friends at the park early
in the morning.

70. Activity 3
Which of the following shows preventive
measures against too much heat ang light
from the sun? Put a check mark on the
corresponding column.

71. Activity 3
Activity Preventive
Measure
Not a
Preventive
Measure
1.Watering the plants regularly.
2. Giving animals adequate
water to drink.
3. Walking under the sun without
using hats or umbrellas.
4.Children playing outdoor
games during sunny days.
5. Staying inside the house when
the sun is shining brightly.

72. Application
What are the effects of light, sounds, and heat
on our lives?
What should you do to make sure that you are
getting the right amounts and the beneficial
kinds of light, sound, and heat energy?

73. Generalization
Too much heat, light and sound is not good for
us. People who are exposed to loud noise for
long periods may suffer loss of hearing. People
who are exposed to too much heat and light
may suffer from different skin ailments. Being
aware of the bad effects of heat, light and
sound could enable us to come up with ways to
protect ourselves from the dangers they may
pose to our health.

74. Generalization
An umbrella, hat and sunglasses are things we can
use to protect us from the excessive heat of the sun.
To protect ourselves from the light and heat of the
sun, we can do simple things such as:
1.We should avoid playing under the sun when it is
high noon.
2. Let us not look directly at the sun.
3. Apply sunblock lotion when we go swimming.

75. Assessment
Encircle the letter of the correct answer.
1.Which of the following is good to use when we go
out on a sunny day?
A. umbrella
B. sunglasses
C. sunblock
D. all of these

76. Assessment
2. Which of the following is good to use to protect our
ears from the noise in the environment?
A. earmuffs
B. cotton buds
C. earrings
D. all of these

77. Assessment
3. Why is it not advisable to stay in hot and noisy
places?
I. Our sense of hearing may be affected.
II. Our sense of sight may be damaged by the sun.
III. It may cause different skin problems.
A. I & II
B. II & III
C. I & III
D. I, II, & III

78. Assessment
4. What must you do if you want to swim on a clear
sunny day?
A. Wear a jacket so that your skin will not get burnt.
B. Wear protective food wear like boots.
C. Use a beach umbrella while swimming.
D. Apply sunblock lotion to protect your skin from the
heat of the sun

79. Assessment
5.Which of the following shows the proper way of
protecting oneself from the heat of the sun?
A. Drinking plenty of water to keep hydrated during
summer.
B. Wearing protective clothing like long sleeved cloths
if you are working under the sun.
C. Use wide-brimmed hat when working in the fields.
D. All of the above

80. Additional Activity
List down ways that you could do to protect yourself
from the loud noise of a concert performance.

81. D
A
Y
5