5th grade naturales unit 5 (2) worksheet - Free Printable

Let's solve the problem step by step.

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1. Are the sentences true or false?

We will evaluate each statement based on scientific principles related to sound.

a. Sound travels in waves
✔ True
Sound is a mechanical wave that propagates through a medium (like air, water, or solids) as vibrations.

b. Sound does not travel in space because there is no gravity there.
✘ False
Sound does not travel in space not because of lack of gravity, but because space is a vacuum with no medium (like air or water) for sound waves to travel through. Gravity is not the reason.

c. Sound can travel in all directions.
✔ True
When a sound source vibrates, it sends out sound waves in all directions from the source.

d. Sound can travel through different materials.
✔ True
Sound travels through solids, liquids, and gases — just at different speeds depending on the material.

e. Sound travels slower through water than through air.
✘ False
Actually, sound travels faster through water than through air. In fact, sound travels about 4 times faster in water than in air.

f. Large vibrations are perceived as soft sounds.
✘ False
Large vibrations produce louder sounds, not soft ones. The amplitude of vibration determines loudness: larger amplitude = louder sound.

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✔ Answers for Question 1:

a. True
b. False
c. True
d. True
e. False
f. False

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2. Match the sentence halves about the properties of light.

We need to match each sentence on the left with the correct phrase on the right.

Let’s analyze:

- Light energy travels in... → ...straight lines called rays.
Light travels in straight lines until it interacts with something.

- Light from the sun takes... → ...8 minutes and 20 seconds to reach the Earth.
This is a well-known fact: sunlight takes approximately 8 minutes and 20 seconds to travel from the Sun to Earth.

- Light energy travels at... → ...300,000 km per second
The speed of light in a vacuum is about 300,000 kilometers per second.

- When light comes into contact... → ...with an object, it is absorbed, reflected, or refracted.
When light hits an object, these three things can happen depending on the surface and material.

- A ray of light contains... → ...all colours.
White light (such as sunlight) is made up of all colors of the spectrum. A ray of white light contains all colors.

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✔ Matching Answers:

| Left Side | Right Side |
|----------|------------|
| Light energy travels in... | ...straight lines called rays. |
| Light from the sun takes... | ...8 minutes and 20 seconds to reach the Earth. |
| Light energy travels at... | ...300,000 km per second |
| When light comes into contact... | ...with an object, it is absorbed, reflected, or refracted. |
| A ray of light contains... | ...all colours. |

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✔ Final Answer Summary:

#### 1. True or False
a. True
b. False
c. True
d. True
e. False
f. False

#### 2. Matching
- Light energy travels in... → straight lines called rays.
- Light from the sun takes... → 8 minutes and 20 seconds to reach the Earth.
- Light energy travels at... → 300,000 km per second
- When light comes into contact... → with an object, it is absorbed, reflected, or refracted.
- A ray of light contains... → all colours.

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