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Sustainable engineering meets people’s needs today without harming the future. Engineers reduce waste (use less material and energy), reuse things (refill bottles, give books away) and recycle what is left (melt cans, pulp paper, turn plastic into tiles and benches). They prefer renewable energy — sunlight, wind, flowing water, biogas — over coal, petrol, diesel and natural gas, which run out.
✓ You passed this lesson’s test.
Reduce, reuse, recycle — “use less first, use things again next, and recycle last”
Use it for: Eco-club projects, Earth Day activities and designing with recycled materials.
Check: Melting old cans into new cans would be recycle ✓
▶ Watch it animatedWork it out in your head or on paper, type the answer and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.
🏅 Sign in with Google to earn the ♻️ Green Engineer badge when you pass — and a certificate when you finish all 8 lessons of Part 3 · Structures and materials. You can still take the test without signing in.
Why does it work? When should you use it? Ask in English, मराठी or हिंदी.
Sign in with Google to ask Free — 20 questions a day.
Prefer a real teacher? TalentJR teachers take live online classes anywhere in India and visit homes in selected cities. Tell us what you need and our team will call you with timings and fees.