Carlos struggles to create the perfect sound for his invented instrument before a concert. The class visits the Sound Museum, where they explore sound concepts like vibrations and echoes. With guidance, Carlos learns that sound is created by vibrations and successfully adjusts his instrument for the performance.

What was Carlos's main issue with his invented instrument?

• It was too heavy.

• It was too small.

• It looked bad.

• It sounded loopy.

What did Miss Frizzle suggest Carlos should do to solve his problem?

• Change the instrument's design.

• Use a different instrument.

• Ask more questions.

• Give up on the instrument.

What did Carlos add to his instrument to make it sound like a thunderstorm?

• A lion's mane.

• An umbrella.

• A drum.

• A foghorn.

What did the class discover about sound in the mysterious house?

• Sound is made by vibrations.

• Sound is a type of light.

• Sound can only be heard underwater.

• Sound does not travel in waves.

What did Carlos realize about his instrument's design?

• It needed more decorations.

• It needed to be electric.

• It needed to vibrate to make sound.

• It was too small to produce sound.

Who did the class meet in the mysterious house?

• A ghost.

• A famous musician.

• Professor Cornelius Contralto the Second.

• A scientist.

What is the main cause of sound according to the video?

• Electricity.

• Heat.

• Vibrations.

• Light waves.

What did the class use to see sound waves?

• Magic glasses.

• A telescope.

• A magnifying glass.

• A microscope.

What did Professor Contralto the Second help Carlos understand?

• How to play the piano.

• How to make his instrument sound perfect.

• How to sing better.

• How to build a new instrument.

What was the final outcome for Carlos's instrument?

• It was broken.

• It was added to the sound collection.

• It was given to another student.

• It was discarded.