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1. What is glass primarily made from?
A. Metal
B. Sand
C. Plastic
D. Wood
2. Which chemicals are used in making glass?
A. Soda and lime
B. Sulfur and lime
C. Sodium chloride and lime
D. Sodium and potassium
3. How is glass shaped after heating?
A. By freezing it
B. By molding and blowing
C. By cutting it
D. By freezing it into blocks
4. What happens to glass when it cools?
A. It stays liquid
B. It becomes soft
C. It becomes stiff and hard
D. It melts
5. What makes glass brittle?
A. Its hardness
B. Its smooth surface
C. Its chemical properties
D. Its transparency
6. How can molten glass be shaped into flat sheets?
A. By blowing it
B. By rolling it
C. By floating it on molten metal
D. By pouring it into molds
7. What property of glass makes it impermeable?
A. It is smooth
B. It is brittle
C. It does not allow liquids to pass through
D. It is transparent
8. Why is glass widely used for storing food and water?
A. It is lightweight
B. It does not impart taste or smell
C. It is colorful
D. It can be easily broken
9. What is ordinary glass's natural color?
A. Blue
B. Green
C. Colorless
D. Yellow
10. How can glass be colored?
A. By adding sand
B. By using different combinations of chemicals
C. By mixing dyes
D. By painting it
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