If you had to make some headphones to isolate sound, which material would you use?

Soft, because they absorb sound.

Hard, because they reflect sound.

The speed of sound depends on these two things:

The type of medium and the temperature of the medium

Speed of the medium and temperature of the medium

Temperature of the medium and sound of the medium

Dan was sitting outside playing his new drum when his dog knocked some sand on it. Afterwards, each time Dan thumped the drum, he noticed the sand on top of the drum bounced. Which of the following is the best explanation for why this happened?

Vibrations moved from the drum to the sand.

Dan was thumping the drum too hard.

Vibrations moved from the sand to the drum.

Jane and Sophie were playing a game in the pool. Jane would ask a question andthen both girls would go under the water where Sophie would say the answer. The girls observed that the sound was different under water. Why is the sound different?

Sound moves differently through the water than the air.

Sophie didn’t speak loudly enough.

Sound doesn’t vibrate in the water.

Ears don’t receive sound under water.

Megan was listening to her favorite song on the radio. She wanted to hear the song louder but she knew she shouldn’t turn the radio volume up. What could Megan do to hear the song louder?

Close her eyes and focus on the music

Move the radio farther from her

Jaylen put a different amount of water into three different jars. He tapped each of the jars with a spoon and found that the jar with the least amount of water has the highest pitch. Jaylen added another jar, but left it empty. What would be the pitch of the empty jar when tapped with a spoon?

The pitch would be higher than the other jars.

The pitch would be lower than the other jars.

The pitch would not change, but the volume of the sound would increase.

The pitch would not change, but the volume of the sound would decrease.

When tapped by a spoon, the jar with the most water has the lowest pitch of all three jars. What does this say about the vibrations of jar with the most water?

the jar with the most water vibrates slower than the other jars

the jar with the most water vibrates faster than the other jars

As more water is added to the jars, the sound created by tapping it with a spoon has a lower pitch. What does this say about the volume?

The volume does not change just because the pitch changes.

A lower pitch means the volume is softer.

A lower pitch means the volume is louder.

You stand outside a room that has the doors and windows closed. Why can you still hear sounds made inside the room?

Vibrations travel through the door and the window

Vibrations are absorbed in the doors and windows

Vibrations are reflected inside the room

Sound Class 9 NCERT

Authored by SATHYA MITIRAN J S

Physics

9th Grade

NGSS covered

Used 692+ times

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50 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Sound moves in a _________.

Transverse wave

Longitudinal wave

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How is sound produced?

By the vibration of particles

By the transfer of particles

Tags

NGSS.MS-PS4-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Area of a longitudinal wave where particles are CLOSE together.

Compression

Rarefaction

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Area of a longitudinal wave where particles are APART.

Compression

Rarefaction

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which device measures sound waves?

Oscilloscope

Stethoscope

Radio

I don't know

Tags

NGSS.MS-PS4-1

NGSS.MS-PS4-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The reflection of sound waves off of a hard surface can create ______.

A wave

An echo

Tags

NGSS.MS-PS4-2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Soft surfaces _______ sound waves.

Reflect

Absorb

Tags

CCSS.RI.8.7

CCSS.RI.9-10.7

CCSS.RL.11-12.8

CCSS.RL.8.7

CCSS.RL.9-10.7

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Sound Class 9 NCERT

Sound moves in a _________.

How is sound produced?

Area of a longitudinal wave where particles are CLOSE together.

Area of a longitudinal wave where particles are APART.

Which device measures sound waves?

The reflection of sound waves off of a hard surface can create ______.

Soft surfaces _______ sound waves.

___________ measures how close or far particles are.

________ describes how LOUD a sound is.

____________ is determined by sound wave's frequency.

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