Which of the following is not a heavy industry ?
Correct answer: D. none
- A. iron
- B. fertilizer
- C. paper
- D. none
Explanation
Iron, fertiliser and paper manufacture all involve large-scale plants, substantial raw materials and high energy use, so each is commonly treated as a heavy industry. Students may look for paper as the exception because it produces a familiar consumer product, but that does not make it a light industry.
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About Polymers
Polymers are large molecules made from repeating monomer units joined by covalent bonds. The topic distinguishes addition polymers such as polyethylene, PVC and polystyrene from condensation polymers such as nylon and polyester, and relates chain structure to thermoplastics, thermosetting polymers, elastomers, properties, uses and environmental concerns.
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