Worksheet: Sound | IGCSE Cambridge Science for Year 6 - Class 6 PDF Download

Multiple Choice Questions (MCQs)

Q1. What is the role of echoes in measuring distance?

A) They amplify sound.

B) They reduce noise.

C) They reflect sound waves.

D) They calculate the time between sound and its echo.

Answer: D) They calculate the time between sound and its echo.

Explanation: Echoes are used to measure distances by calculating the time it takes for a sound wave to travel to a reflective surface and back.

Q2. Which animals are known to use echolocation?

A) Dogs

B) Bats

C) Elephants

D) Fish

Answer: B) Bats

Explanation: Bats use echolocation to navigate and find food due to their poor eyesight, relying on the reflection of sound waves.

Q3. What determines the speed of sound in a medium?

A) The light intensity in the medium

B) The temperature and properties of the medium

C) The amount of moisture in the air

D) The altitude of the medium

Answer: B) The temperature and properties of the medium

Explanation: The speed of sound is influenced by factors like temperature and the physical properties of the medium through which it travels.

Q4. Why can't sound travel through a vacuum?

A) There is too much resistance.

B) There are no particles to transmit sound.

C) Sound waves are too weak.

D) A vacuum absorbs all sound.

Answer: B) There are no particles to transmit sound.

Explanation: Sound needs a medium (particles) to travel; in a vacuum, there are no particles to carry the vibrations, thus sound cannot propagate.

Q5. What is a common method to reduce echo in a room?

A) Painting the walls

B) Installing brighter lights

C) Using sound-absorbing materials

D) Increasing the room temperature

Answer: C) Using sound-absorbing materials

Explanation: Materials that absorb sound, like carpets and curtains, help reduce echoes by preventing the reflection of sound waves.

Fill-in-the-Blanks

Q1. Echoes occur when sound waves are __________ off surfaces.

Answer: reflected

Q2. Sound is produced by the __________ of objects.

Answer: vibrations

Q3. Sound waves need a __________ to travel through; they cannot travel through a __________.

Answers: medium, vacuum

Q4. Ultrasound scans use __________ waves to create images of the inside of the body.

Answer: sound

Q5. Excessive echoes can make conversation difficult in environments with __________ walls and floors.

Answer: bare

True/False

Q1. Sound can travel faster in solids than in gases. (True/False)

Answer: True

Explanation: Sound travels faster in solids due to the closer proximity of the particles, which facilitates quicker vibration transmission.

Q2. Echoes are detrimental and have no practical use. (True/False)

Answer: False

Explanation: Echoes are used in various applications like measuring distances and in medical imaging techniques such as ultrasounds.

Q3. All materials reflect sound waves equally. (True/False)

Answer: False

Explanation: Different materials have different sound absorption properties; soft materials generally absorb more sound than hard materials.

Q4. Compressions (areas of high pressure) and rarefactions (areas of low pressure) (True/False)
Answer: True

Explanation: Compression and Rarefaction: These vibrations create sound waves, which consist of compressions (areas of high pressure) and rarefactions (areas of low pressure) 

Q5. Temperature does not affect the speed of sound. (True/False)

Answer: False

Explanation: The speed of sound is affected by temperature, with higher temperatures typically allowing sound to travel faster.

Match the Column

Answers:

A - 3

B - 4

C - 2

D - 1
E - 5

Explanation:

A) Sound waves behave by compressing and rarefying air particles.

B) A medium with particles is necessary for sound to travel.

C) Sound is created through the vibrations of objects.

D) Echoes play a role in reflecting sound waves to measure distances or create images.
E)  Vibrations in air particles  Create sound waves