Chlorine demand of water is equal to

when demand for factory's products is high . more money is spent at the factory for safety precautions and machinery maintenance than when demand is low. thus the average number of on -the-job accidents per employee each month should be lower during perids when demand is high than when demand is low and less money is available for safety precautions and machinery maintenance .when demand for its products is high, casts the most serious doubt on the conclusion drawn above?

A

Employees demand for higher wages than they do at other times.

B

Authority hires new workers but lacks the time to rain them properly.

C

Employees are less likely to lose their jobs than are at other times.

D

Authority sponsors a monthly safety award for each division in the factory.

When demand for a factory's products is high, more money is spent at the factory for safety precautions and machinery maintenance than demand is low. Thus the average number of on-the-job accidents per employee each month should be bower during periods when demand is high than when demand is low and less money is available for safety precautions and machinery maintenance. Which of the following,if true about a factory when demand for its product is high casts the most serious doubt on the conclusion drawn above?

A

Its employees ask for higher wages than they do at other times.

B

Its management hires new workers but lacks the time to train them properly.

C

Its employees are less likely to lose their jobs than they are at other times.

D

Its management sponsors a monthly safety award for each division in the factory.

Water এর chlorine demand হল-

A

applied chlorine

B

residual chlorine

C

sum of applied and residual chlorine

D

difference applied and residual chlorine

The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by

A

TOD > BOD > COD

B

TOD > COD > BOD

C

BOD > COD > TOD

D

COD > BOD > TOD

Dose of chlorine for disinfection of water is about __________ mg/litre of water.

A

0.01

B

0.1

C

0.3

D

1

Residual chlorine in water is determined by

A

Starch iodide method

B

Orthotolidine method

C

Both (A) and (B)

D

None of the above

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

The amount of chlorine available in water after disinfection is called as

A

Free chlorine

B

Residual chlorine

C

Free available chlorine

D

Combined available chlorine

Normal dosage of chlorine in public water supply scheme ranges from __________ ppm.

A

0.5 to 1

B

10 to 15

C

300 to 500

D

1000 to 1500

Maximum permissible residual chlorine in treated water should be __________ mg/litre.

A

0.001 to 0.01

B

02 to 0.3

C

2 to 3

D

5 to 10

Chlorine demand of water is equal to

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