Year 4 Science Sound: check-up and practice test questions

Method. Read the table in section 8.1.

1. Read the drum row. The drum skin vibrates.
   the skin of the drum
2. Write the answer.
   the skin of the drum

Check. Feel the skin when the drum sounds. ✓

Method. Read the table in section 8.2.

1. Read the solid row. A wooden table is a solid.
   solid
2. Write the answer.
   solid

Check. Wood keeps its shape. ✓

Method. Read the key idea in section 8.2.

1. Read the key idea. The vibrations make the eardrum vibrate.
   eardrum
2. Write the answer.
   eardrum

Check. The eardrum is inside the ear. ✓

Method. Read the pitch column.

1. Read the table. The short overhang has a high pitch.
   high pitch
2. Write the answer.
   short overhang

Check. Short parts vibrate faster. ✓

Method. Read the key idea in section 8.3.

1. Read the key idea. Fast vibrations give a high pitch.
   high
2. Write the answer.
   higher

Check. Fast means higher. ✓

Method. Read the loudness column.

1. Read the loudness column. The hard hit is loud.
   loud
2. Write the answer.
   hard

Check. A hard hit makes a big vibration. ✓

Method. Use the pattern in section 8.4.

1. Use the pattern. A big vibration makes a loud sound.
   loud
2. Write the answer.
   loud

Check. Bigger vibrations make louder sounds. ✓

Method. Read the faint row.

1. Read the row. The faint listener is 10 metres away.
   10
2. Write the answer.
   10

Check. Ten metres is the furthest listener. ✓

Method. Compare the two distances.

1. Read the distances. Ali is 1 metre away, and Ruby is 5 metres away.
   1 and 5
2. Decide. The nearer listener hears the louder sound, so it is Ali.
   Ali
3. Write the answer.
   Ali

Check. Sounds get fainter with distance. ✓

Method. Think about what carries the vibrations.

1. Think about the medium. Sound needs a medium to carry the vibrations.
   medium
2. Write the reason. Empty space has no solid, liquid or gas to carry them.
   no medium
3. Write the answer.
   Accept any sentence that says sound needs a medium, a solid, liquid or gas, to carry the vibrations.

Check. A medium is what the vibrations pass through. ✓

Method. Read the key idea.

1. Read the key idea. Sound is made when something vibrates, which is a quick back-and-forth movement.
   vibration
2. Write the answer.
   vibration

Check. Vibrations make sound. ✓

Method. Read the table of sound-makers.

1. Read the speaking row. When a person speaks, the voice box in the throat vibrates.
   voice box
2. Write the answer.
   the voice box, in the throat

Check. You can feel your throat move when you hum. ✓

Method. Think about the table.

1. Think about the table. A wooden table keeps its shape, so it is a solid.
   solid
2. Write the answer.
   solid

Check. A solid is a medium for sound. ✓

Method. Read the key idea.

1. Read the key idea. The vibrations travel to the ear, and make the eardrum vibrate.
   eardrum
2. Write the answer.
   eardrum

Check. The eardrum is the thin part in the ear. ✓

Method. Read the question.

1. Read the definition. How high or low a sound is, is called its pitch.
   pitch
2. Write the answer.
   pitch

Check. Pitch is about high or low, not loud or quiet. ✓

Method. Think about the pattern.

1. Think about the pattern. A longer overhang vibrates more slowly, so it has a lower pitch.
   lower pitch
2. Choose the longer one. The longer overhang is 15 cm.
   15
3. Write the answer.
   15

Check. Check: 5 cm gives a higher pitch than 15 cm. ✓

Method. Think about the vibrations.

1. Think about the hits. A very hard hit makes a bigger vibration.
   bigger vibration
2. Decide. A bigger vibration makes a louder sound, so the hard hit is louder.
   hard
3. Write the answer.
   hard

Check. Bigger vibrations are louder. ✓

Method. Think about the distance.

1. Think about the distance. Sounds get fainter as the distance from the source increases.
   fainter
2. Choose the further one. The person 10 metres away hears the fainter sound.
   10
3. Write the answer.
   10

Check. The further listener hears the fainter sound. ✓

Method. Think about the spreading vibrations.

1. Think about the spreading. The vibrations spread out in all directions.
   spread out
2. Write the reason. So less of the sound reaches the listener who is far away.
   less of the sound
3. Write the answer.
   Accept any reason that says the vibrations spread out over a bigger area, so less of the sound reaches the far listener.

Check. Spreading out makes sound fainter. ✓

Method. Think about the string.

1. Think about the speaker. The speaker makes the cup vibrate, and the vibrations pass into the string.
   string
2. Think about the listener. The vibrations travel along the tight string to the other cup, and reach the ear.
   travel along
3. Write the answer.
   Accept any sentence that says the vibrations travel along the tight string from one cup to the other.

Check. The string is the medium that carries the vibrations. ✓