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Day 71-Dec 5-worksheet-Btech-Biological water quality parameters

Total questions: 15

Worksheet time: 10mins

Name
Class
Date
1.

Which bacterial shape is shown as long cylindrical rods in biological water analysis?

a)

Coccus

b)

Spirilla

c)

Bacillus

d)

Vibrio

2.

Bacteria that cause diseases in humans are termed:

a)

Non-pathogens

b)

Aerobic organisms

c)

Pathogens

d)

Facultative organisms

3.

In membrane filter technique, final bacterial count is expressed as:

a)

TCU

b)

NTU

c)

CFU

d)

MPN

4.

Which is NOT an advantage of the membrane filter technique?

a)

High accuracy

b)

Results available in short time

c)

Less preparation required

d)

Requires heavy laboratory setup

5.

The presumptive coliform test uses:

a)

EMB agar

b)

Lactose broth

c)

Nutrient broth

d)

BGLB broth

6.

According to IS 1622–1981, MPN values depend on:

a)

TDS concentration

b)

Combination of positive tubes in different dilutions

c)

pH and alkalinity

d)

Only 10-ml sample results

7.

In Thomas equation for MPN, the denominator includes:

a)

Sum of volumes of positive tubes

b)

Square root of product of volumes in negative tubes and all tubes

c)

Product of positive tube volumes only

d)

Product of total sample size and dilution factor

8.

Anaerobic bacteria require oxygen for their growth.

a)

True

b)

False

9.

Coliform index is defined as the reciprocal of the smallest positive sample.

a)

True

b)

False

10.

Coccus, bacillus, and spirilla differ mainly in their (a)   .

11.

Each bacterium is assumed to grow into a single visible (a)   after incubation.

12.

What is the MPN test also known as?

a)

presumptive

b)

confirmatory

c)

completed

d)

selective

13.

Which equation is used to calculate MPN when tables are not available?

(a)  

14.

The confirmed test for coliform bacteria uses which broth?

(a)  

15.

MPN value increases when the number of ————-tubes is high

(a)