Biogas Production - Gobar Gas Plant - Unsolved Practice Paper
Chapter: Microbes in Human Welfare | Topic: Biogas Production Gobar Gas Plant
BIOGAS PRODUCTION - GOBAR GAS PLANT - UNSOLVED PRACTICE PAPER
Topic: Biogas Production Gobar Gas Plant
Multiple Choice Questions
Q1. Biogas is primarily composed of:
- Pure oxygen
- A mixture of gases, mainly methane, along with some carbon dioxide, hydrogen, and hydrogen sulphide
- Only carbon dioxide
- Only nitrogen gas
Q2. The group of bacteria responsible for producing methane during anaerobic digestion in a biogas plant are called:
- Nitrifying bacteria
- Methanogens (such as Methanobacterium)
- Lactic acid bacteria
- Denitrifying bacteria
Q3. In a typical Indian "gobar gas" plant, the primary raw material used for biogas production is:
- Fresh fruit waste only
- Cattle dung (along with other organic waste) mixed with water to form slurry
- Only chemical fertilisers
- Plastic waste
Q4. The digestion process that occurs inside a biogas plant to produce methane takes place:
- In the presence of oxygen (aerobically)
- In the absence of oxygen (anaerobically)
- Only at freezing temperatures
- Only in sunlight
Q5. Besides being used as a fuel, the leftover slurry from a biogas plant is commonly used as:
- A toxic waste product with no further use
- An enriched organic manure for agricultural fields
- Drinking water
- A building material
Short Answer Questions
Q6. What is biogas, and which gas present in it is primarily responsible for its use as a fuel?
Q7. Name the group of microorganisms responsible for methane production in a biogas plant, and mention the conditions they require.
Q8. What raw material is typically used in a traditional Indian gobar gas plant, and how is it prepared for digestion?
Q9. Besides fuel, mention one other important use of the by-product obtained from a biogas plant.
Long Answer Questions
Q10. Describe the structure and working of a typical gobar gas plant, explaining how cattle dung is converted into biogas.
Q11. Discuss the significance of biogas production for rural India, considering both its use as a fuel source and its role in providing organic manure.
APPLICATION / ANALYSIS
Q12. A farmer sets up a small gobar gas plant on his farm using cattle dung generated daily from his livestock. Explain how this single setup could help meet two of his household/farming needs simultaneously.
Q13. A biogas plant operator notices that gas production has significantly decreased during an unusually cold winter period, even though the same amount of dung slurry is being added daily. Explain, using your understanding of methanogen activity, why colder temperatures might be affecting biogas output.