GATE Environmental Management and Sustainable Development: Energy and Environment – Previous Year Questions

6 GATE previous year questions on Energy and Environment (Environmental Management and Sustainable Development, Environmental Science and Engineering) with answers and explanations, from every paper.

1. GATE 2021 ES Q50 (2 marks, Multiple select) – At a fixed location, which influence solar radiation incident on a rooftop solar-water heater?
2. GATE 2023 ES Q62 (2 marks, Numerical answer) – Anita travels30 km daily on a petrol scooter giving50 km/L. She replaces it with an electric scooter using.1 kWh per 10 km. Petrol costs₹90/L,…
3. GATE 2024 ES Q64 (2 marks, Numerical answer) – Annual gasoline use is 30.6 million tons. Gasoline density is 850 kg/m³;ethanol has 67% of gasoline’s energy per equal volume. Sugarcane ethanol yield…
4. GATE 2025 ES Q31 (1 mark, Multiple select) – Methane hydrates trap methane in a water-crystal structure. Which statements are correct?
5. GATE 2025 ES Q61 (2 marks, Numerical answer) – An incandescent bulb used2 hours/day consumes12.2 kWh/month. Coal electricity yield is 2 kWh/kg and PM₁₀ emission is 7 g/kg coal. An LED uses…
6. GATE 2026 ES Q65 (2 marks, Numerical answer) – Land yields 7000 L bioethanol/hectare with energy content 21 MJ/L, replacing fossil petrol. Bioethanol and petrol footprints are respectively 10 and…