Presence of a certain minimum quantity of flourine is desirable in potable water to prevent

Presence of excess flourine in water causes

A

Dental cavity

B

Tooth decay

C

Fluorosis

D

Respiratory disease

Presence of bacteria in potable (drinking) water causes

A

Turbidity

B

Disease

C

Bad odour

D

Bad taste & colour

Potable water means the water used for

A

Fire-fighting

B

Cooling

C

Drinking

D

Evaporation to produce steam

Presence of predominantly large quantity of aromatics (polynuclear) is not desirable in aviation fuel, because it has

A

High pour point and low smoke point

B

Low viscosity index

C

High self-ingnition temperature

D

All of the above

Drinking (potable) water treatment does not involve

A

Coagulation

B

Sedimentation

C

Softening

D

Disinfection

The pH value of potable water should be between

A

1 to 1.5

B

6.5 to 8

C

13 to 14

D

4 to 5

Maximum permissible turbidity in potable water is __________ ppm.

A

1

B

10

C

250

D

1000

TLV of mercury in potable (drinking) water is about __________ ppm.

A

0.001

B

0.1

C

1

D

5

For classification of potable (drinking) water, we use a __________ filter.

A

Gravity sand

B

Plate and frame

C

Vacuum leaf

D

Rotary vacuum

5a2-4a-3-3(a2+a+4)=0. What is the sum of the potable value of a?

A

3

B

3.5

C

4

D

4.5

Presence of a certain minimum quantity of flourine is desirable in potable water to prevent

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