The term Biological Oxygen Demand (BOD) is used in relation to

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

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.

BOD (Biological Oxygen) নির্ণয় করার সঠিক সমীকরণ কোনটি ?

A

BOD=D1+D2-B1+B2×1Pmg. L-1

B

BOD=V1-V2×M×8×1000Xmg. L-1

C

BOD=D1+D2×B1+B2×1Pmg. L-1

D

BOD=V1+V2×M×8×1000Xmg. L-1

The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is

A

1

B

100

C

Infinite

D

Zero

কোনো একটি নমুনা পানির BOD (Biochemical Oxygen Demand ) 3 mg/L হলে নমুনা পানিটি সম্পর্কে সঠিক?

A

খুবই ভালো

B

মোটামুটি ভালো

C

দূষণমাত্রা খারাপ

D

দূষণমাত্রা খুবই খারাপ

How the biological oxygen demand gets affected with the increased presence of organic matter in water?

A

the oxygen demand increases

B

the oxygen demand decreases

C

the oxygen demand remains unchanged

D

none of the mentioned

The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known

A

Bio-Chemical Oxygen Demand (B.O.D.)

B

Dissolved Oxygen (D.O.)

C

Chemical Oxygen Demand (C.O.D.)

D

None of these

In the context of the chemical process industries, the term BOD is normally associated with the

A

Characterisation of solid wastes

B

Organic concentration in gaseous effluents

C

Characterisation of liquid effluents

D

Characterisation of boiler feed water

একটি অক্সিজেন সিলিন্ডারের আয়তন 10 x 105 cm3 এবং এতে 300 বায়ুমন্ডলীয় চাপে অক্সিজেন ভর্তি আছে। কিছুটা ব্যবহারের পর দেখা গেল যে, চাপ 200 বায়ুমন্ডলীয় চাপে নেমে গেছে। ব্যবহারকৃত অক্সিজেনের আয়তন কত?(The volume of an oxygen cylinder is 10 x 105 cm3 and pressure is 300 atm. After some use, the pressure drops to 200 atm. What is the volume of the used oxygen?)

A

1000 L

B

500 L

C

2000 L

D

1200 L

E

1500 L

The term Biological Oxygen Demand (BOD) is used in relation to

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