Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of

The amount of residual chlorine left in public water supply for safety against pathogenic bacteria is about

A

0.01 to 0.05 ppm

B

0.05 to 0.5 ppm

C

0.5 to 1.0 ppm

D

1.0 to 5.0 ppm

Which of the following is a waterborne disease?

A

Smallpox

B

Malaria

C

Cholera

D

Tuberculosis

The number of bacteria in a colony was growing exponentially . At 1 pm yesterday the number of bacteria was 1000 and at 3 pm yesterday it was 4000. How many bacteria were there in the colony at 6 pm yesterday ?

A

32,000

B

80,000

C

60,072

D

7,683

A certain population of bacteria doubles every 10 minutes. If the number of bacteria in the population initially was 104, what was the number of bacteria in the population 1 hour later?

A

2(104)

B

6(104)

C

(26) (104)

D

(106)(104)

It takes 30 days to fill a laboratory dish with bacteria, If the size of the bacteria doubles each days, how long will it take for the bacteria to fill one-----half of the dish?

A

10 days

B

15 days

C

24 days

D

29 days

Pathogens (or pathogenic bacterias) in water may cause

A

Typhoid

B

Cholera

C

Dysentery

D

All the above

Which bacteria do not destroy without autoclave?

A

Aerobic bacteria

B

Anaerobic bacteria

C

Spore bearing bacteria

D

Rod shape bacteria

Disinfection of drinking water, is done to remove

A

odour

B

bacterias

C

turbidity

D

colour

Disinfection of water is done to remove

A

Color

B

Bad taste

C

Foul odour

D

Bacteria

The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant?

A

Chlorine

B

Alkalis

C

Benzene hexachloride

D

Alkyl benzene sulphonate (ABS)

Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of

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