Related Questions

In deep-sea diving, divers use a mixture of gases consisting of oxygen and
A Hydrogen
B Nitrogen
C Argon
D Helium
Helium is added to the oxygen supply of deep sea divers because it is
A Less poisonous than nitrogen
B Lighter than nitrogen
C Readily miscible with oxygen
D Less soluble in blood than nitrogen at high pressure
(When) our vacation, we (plan) to spend three (days) scuba (diving). (Select the one bracketed word or phrase that is incorrect)
A When
B plan
C days
D diving
Diving by 3/8 and then multiplying by 5/6 is the same as dividing by what number ?
A 35/5
B 30/7
C 9/20
D 20/9
when our vacation , we plan to spend three days scuba diving
A when
B plan
C days
D diving
Select the underlined word of phrase that is incorrect: When our vacation, we plan to spend three days scuba diving.
A when
B plan
C days
D diving
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
In flue gas analysis by Orsat's apparatus, oxygen is absorbed by
A Potassium hydroxide
B Cuprous chloride
C Alkaline pyragllol solution
D None of these
Helium gas is used in gas balloons instead of hydrogen gas because it is
A Lighter than hydrogen
B More abundant than hydrogen
C Non-combustible
D More stable
Hydrogen is used instead of Helium to fill balloons for meteorology because
A of its low-density
B It is almost insoluble in water
C It is not very reactive under normal conditions
D It can be prepared easily

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