Civil Engineering
2026 · Paper 2
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Complete GATE CE 2026 Paper 2 overview, original pages and practice · Timed previous-paper practice
Questions 64–65 of 65. Imported answers require review unless explicitly marked reviewed.
Question 64
Open questionCENAT2 marksNeeds review
Anaerobic bacteria are being utilized for the destruction of biodegradable organic content of wastewater measured in terms of Chemical Oxygen Demand (COD). The yield coefficient (Y) is 0.06 gram Volatile Suspended Solids (VSS) per gram of COD. Bacterial biomass forms the sludge during the process. The proximate chemical formula of anaerobic bacteria is C₆H₇NO₂.
The COD (in %) converted into bacterial biomass is ______ (rounded off to the nearest integer).
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Open questionCENAT2 marksNeeds review
In an industry, a cyclone collector with 80 % efficiency is installed for air purification, followed by an electrostatic precipitator with 50 % efficiency. The concentration of particles entering the cyclone collector is 10 mg/m³.
The concentration (in mg/m³) of particles exiting the precipitator is ______ (rounded off to two decimal places).
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