The residue left after methane production from cattle dung is:

1. burnt

2. burried in land fills

3. used as manure

4. used in civil construction

Gases found in biogas are:
1. Carbon dioxide is the only gas
2. Methane is the only gas
3. Carbon dioxide, hydrogen sulphide and Methane
4. Carbon dioxide, hydrogen cyanide and Methane

In the given diagram the gas X can be :

1. Hydrogen

2. Carbon monoxide

3. Ammonia

4. Oxygen

Which of the following microbes is correctly paired with its function ?

(1) Aspergillus niger - Production of lactic acid

(2) Trichoderma polysporum  - Lowers blood cholesterol

(3) Saccharomyces cerevisiae  - Production of citric acid

(4) Methanogenic bacteria - Gobar gas formation 

Methanogens are found in:

A. Ethanol

B. Organic acids

C. Anaerobic sludge

D. Rumen of cattle

1. A, C, D

2. C, D

3. B, C, D

4. A, B

The technology of biogas production in India has been developed by the efforts of:

A. Khadi and Village Industries Commision (KVIC)

B. Indian Council of Agricultural Research (IARI)

C. Indian Agricultural Research Institute (IARI)

D. Indian Council of Medical Research (ICMR)

1. A, C, D

2. C, D

3. A, C

4. A, B

The mixture of gases released during anaerobic digestion of sludge is called:

1. Methane

2. Carbon dioxide

3. Biogas

4. Flammable gases

Biogas contains:

1.CO₂

2. H₂S

3. CH₄

4. All of these

Given below are three statements (A-B) each with one or more blanks. Select the option which correctly fill the blanks in the statements Statements:

A. Microbes consume the major part of the organic matter in the effluent and reduce _________ of sewage.

B. Certain bacteria which grow anaerobically on cellulosic material, produce large amount of methane along with CO₂ and H₂. The bacteria are commonly called as _________ and one such common bacterium is _________. Options:

1. A - CO₂ demand; B - methanogens, Methanobacterium

2. A - Carbon; B - methanogens, Methanobacterium

3. A - biochemical oxygen demand; B - methanogens, Methanobacterium

4. A - biochemical oxygen demand; B - Methylokorus infemorum

The below diagram shows a typical biogas plant. Which of the following four option, products labelled as A are correctly identified:

1. A - Sludge; B - Methane, Oxygen; C - Dung, water

2. A - Sludge; B - Methane, Carbon dioxide; C - Dung, water

3. A - Sludge; B - Ethylin, Carbon dioxide; C - Dung, water

4. A - Sludge; B - Methane, Carbon dioxide; C - Sewage