Question 1 of 5
Which material is transparent in a typical window?
Answer & explanation
Glass
Glass lets visible light pass through while forming a solid barrier, which is why it works in windows.
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5 questions · Untimed · Free
There are useful discoveries hiding in familiar objects. Try five questions about glass, waterproof materials, paper, household leaks, and recycling.

Question 1 of 5
Glass
Glass lets visible light pass through while forming a solid barrier, which is why it works in windows.
Question 2 of 5
Resists water passing through
Waterproof means resisting the passage of water; it does not necessarily mean a material can never get wet on its surface.
Question 3 of 5
Paper
Paper is commonly made by separating wood into cellulose fibers and forming those fibers into sheets.
Question 4 of 5

A recurring wet spot near a pipe connection
EPA WaterSense recommends looking below sinks for puddles or water spots because connections can leak without a visible drip from the spout.
Question 5 of 5
Can be processed into new material
A recyclable material can be collected and processed into material for new products; local recycling rules determine what is accepted.

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FROM ANSWERING TO UNDERSTANDING
Look for the property or observation in the question rather than guessing from an object’s name. After answering, describe what you would look for in a real example. Read the explanation before applying an idea to a different material or setting.
Read further with a quiz source: National Institute of Standards and Technology: NIST Materials Reference DataChoose a question that surprised you. Explain the answer in your own words and open its source link if you want to explore further. You can try again; the score reflects this short quiz, not your mastery of the whole category.
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