Microorganisms are used during which stage of the purification of the sewage water?

(1) Primary treatment

(2) Secondary treatment

(3) None of the above

(4) Both (1) and (2)

Subtopic:  Microbes in Sewage Treatment |
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The maximum concentration of alcohol in beverages that are naturally fermented is:
1. 5 - 10%
2. 10 - 15%
3. 20 - 25%
4. 45 - 50%

Subtopic:  Chemistry of Fermented Beverages |
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Big holes in Swiss cheese are made by a:

(1) a machine

(2) a bacterium that produces methane gas

(3) a bacterium producing a large amount of carbon dioxide

(4) a fungus that releases a lot of gases during its metabolic activites.

Subtopic:  Microbes in Household Products |
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The vitamin whose content increases following the conversion of milk into curd by lactic acid bacteria is:

(1) Vitamin C

(2) Vitamin D

(3) Vitamin B12

(4) Vitamin E

Subtopic:  Microbes in Household Products |
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Which one of the following alcoholic drinks is produced without distillation?

(1) Wine

(2) Whisky

(3) Rum

(4) Brandy

Subtopic:  Chemistry of Fermented Beverages |
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Match the following list of bacteria and their commercially important products:

 

Bacterium

 

Product

(i)

Aspergullus niger

(a)

Lactic acid

(ii)

Acetobacter aceti

(b)

Butyric acid

(iii)

Clostridium Butylicum   

(c)

Acetic acid

(iv)   

Lactobacillus

(d)   

Citric Acid

Choose the correct match:

(1) (i) - b, (ii) - c, (iii) - d, (iv) - a

(2) (i) - b, (ii) - d, (iii) - c, (iv) - a

(3) (i) - d, (ii) - c, (iii) - b, (iv) - a

(4) (i) - d, (ii) - a, (iii) - c, (iv) - b

Subtopic:  Microbes in Household Products |
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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

Subtopic:  Microbes in Production of Biogas |
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BOD of waste water is estimated by measuring the amount of:

(1) total inorganic matter

(2) biodegradable organic matter

(3) oxygen evolution

(4) oxygen consumption.

Subtopic:  Microbes in Sewage Treatment |
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The free-living fungus Trichoderma can be used for:

1. killing insects

2. biological control of plant diseases

3. controlling butterfly caterpillars

4. producing antibiotics

Subtopic:  Microbes in Biocontrol Agent |
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The primary treatment of waste water involved the removal of:

(1) dissolved impurities

(2) stable substances

(3) toxic substances

(4) harmful bacteria.

Subtopic:  Microbes in Sewage Treatment |
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