Helium is added to the oxygen supply of deep sea divers because it is _________

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

Why is helium added to oxygen which is used by deep-sea divers?

A

It is immiscible with oxygen

B

It is miscible with oxygen

C

It is less soluble in blood

D

It is less poisonous

The gas used to dilute oxygen for breathing by deep sea divers is:

A

Neon

B

Argon

C

Nitrogen

D

Helium

In deep-sea diving, divers use a mixture of gases consisting of oxygen and

A

Hydrogen

B

Nitrogen

C

Argon

D

Helium

In a well aerated and agitated microbial culture, the 'supply' of oxygen is equal to 'demand' (uptake) of the growing culture. The K_La for such a system will be (K_La = volumetric mass transfer coefficient, C* = dissolved oxygen concentration in liquid in equilibrium with gaseous oxygen, C = instantaneous value of dissolved oxygen concentration, 'r' = specific oxygen uptake rate per unit weight of cells, X = dry weight of the cells per unit volume)

A

$$\frac{{\left( {rX} \right)}}{{\left( {C* - C} \right)}}$$

B

$$\frac{{\left( r \right)}}{{X\left( {C* - C} \right)}}$$

C

$$\frac{{\left( {C* - C} \right)}}{{\left( {rX} \right)}}$$

D

$$\frac{{\left( X \right)}}{{r\left( {C* - C} \right)}}$$

A 2.0 L flask holds 0.40 g of helium gas. If the helium is evacuated into a larger container while the temperature is held constant, what will the effect on the entropy of the helium be?

A

It will remain constant as the number of helium molecules does not change.

B

It will decrease as the gas will be more ordered in the larger flask.

C

It will decrease because the molecules will collide with the sides of the larger flask less often than they did in the smaller flask.

D

It will increase as the gas molecules will be more dispersed in the larger flask.

The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is

A

Argon

B

Xenon

C

Helium

D

Krypton

The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is

A

Neon

B

Krypton

C

Argon

D

Helium

The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is:

A

Neon

B

Argon

C

Krypton

D

Helium

Near a natural gas deposits, we require to set up a gas turbine plant. Geologist inform engineers that helium gas is found in abundance here. Hence, engineers seek to use helium as working medium for the gas power plant. This turbine is a _________

A

Multi-shaft open cycle gas turbine

B

Single shaft open cycle gas turbine

C

Closed cycle gas turbine

D

Simple Open cycle Gas Turbine

Helium is added to the oxygen supply of deep sea divers because it is _________

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