Related Questions

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
The oxygen released during photosynthesis process comes from
A H2O
B CO2
C NO2
D Glucose
Which famous marine World Heritage site is home to 400 species of coral and 1,500 species of fish ?
A Galapagos Islands . Ecuador
B Belize Barrier Reef Reserve System, Belize
C Great Barrier Reef, Australia
D Ha Long Bay, Vietnam
One molecule of oxygen consists of __________ atoms of oxygen.
A 2
B 4
C 8
D 16
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
Oxygen is separated by distillation from air after its liquefaction. The boiling point of oxygen is about __________ °C.
A -83
B -183
C -196
D -218
The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the
A Bacterial stability factor
B Relative stability
C Biological oxygen demand (BOD)
D Oxygen ion concentration
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
Which one of the following chemical is used for reactive dye stripping?
A Ozoec
B Hydrose
C TR cell
D None
C-reactive protein (CRP)
A Does not have antigen specificity
B Increases significantly in acute viral infections
C Is produced in the liver
D Is a useful investigation in the management of bacterial endocarditis
E Activates complement system by the classical pathway

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