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
Equal masses of oxygen, hydrogen and methane are kept under identical conditions. The ratio of the volumes of gases will be
A 2 : 16 : 2
B 2 : 16 : 1
C 1 : 16 : 2
D 1 : 1 : 1
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
Every molecule of water contains ----Oxygen and -----Hydrogen.
A 2, 1
B 1, 2
C 3, 4
D 2, 2
Identify the sentence in which the word element (s) refers to 'suitable or favourable environment. (1) There is an element of truth in your story. (2) Water is composed of elements of hydrogen and oxygen. (3) I feel out of my elements in political discussions. (4) Water is a natural element for fish
A (4)
B (3)
C (1) and (2)
D (1)
Cr(OH)3 এ Chromium , Oxygen এবং Hydrogen এর জারণ সংখ্যা যথাক্রমে কোনগুলো ?
A + 3 , -2 + 1
B +1 , -1, 0
C -3 , + 1, -2
D -1 , + 1, 0
Two atoms of hydrogen ___with one atom of oxygen to from a molecule of water . choose the right word for the gap.
A combine
B combined
C consister
D formed
Oxygen can be mixed with___gasses such as Hydrogen and Nitrogen.
A another like
B another
C the other
D other
Hydrogen and Oxygen help to form-
A fuel
B oil
C ice
D gas
They are organic compounds consisting of carbon, hydrogen and oxygen present in all living organisms.
A Proteins
B Carbohydrates
C Fats
D Minerals

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