Science Junior Cert
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Sound is a form of ________ | Energy
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| Sound is caused by what? | Vibrations
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| What does sound need in order to travel | Medium
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| To demonstrate that sound cannot travel without a medium what instrument would you place in a large sealed bell jar | Alarm clock
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| When the air is extracted from a bell jar with a ringing alarm clock, what happens | You cant hear it
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| What do you call a sound that bounces off an object | Echo
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| What do you call sound waves that have frequencies too high for humans to hear | Ultrasound
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| Name an application of ultrasound | To get image of baby in womb or on fishing vessels
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| What travels faster, light or sound | Light (340m/s)
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| What happens first, thunder or lightning | Lightning
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| What should workers do in a noisy work environment | Wear ear protection
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| How would you measure sound | Sound level meter
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| What is the unit of sound | Decibel dB
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| What level of sound could damage hearing if exposed to it on a regular basis | 85dB
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| What is the lowest level of sound that can be heard called | Threshold of hearing
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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Created by:
gcu science
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