In the diving apparatus, helium is used along with oxygen, because it is

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

In the diving apparatus, helium is used along with oxygen, because it is

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