Certified Hyperbaric Technologist Test CHT Hyperbaric Physics and Gas Laws 4

Question 1

Using absolute temperature, a 5 L gas at 300 K is warmed to 600 K at constant pressure. What is the new volume?

Accepted Answer

10 L

Answer

2.5 L

Answer

5 L

Answer

15 L

Question 2

Why must temperatures be converted to the Kelvin scale when applying gas laws?

Accepted Answer

Kelvin avoids negative values and represents true absolute zero

Answer

Kelvin units are larger than Celsius units

Answer

Kelvin is required only for oxygen

Answer

Kelvin measures pressure not temperature

Question 3

A diver breathing a mix of 32% oxygen at 2 ATA has what oxygen partial pressure?

Accepted Answer

0.64 ATA

Answer

0.32 ATA

Answer

1.0 ATA

Answer

2.0 ATA

Question 4

Which condition results from a trapped gas pocket expanding in the lungs during rapid ascent?

Accepted Answer

Pulmonary barotrauma

Answer

Nitrogen narcosis

Answer

Oxygen toxicity

Answer

Hypercapnia

Question 5

According to Henry's Law, doubling the partial pressure of a gas over a liquid does what to the dissolved amount?

Accepted Answer

Doubles it

Answer

Halves it

Answer

Leaves it unchanged

Answer

Quadruples it

Question 6

Gauge pressure differs from absolute pressure in that gauge pressure does not include what?

Accepted Answer

The 1 ATA of atmospheric pressure

Answer

Water vapor pressure

Answer

Partial pressure of oxygen

Answer

The temperature correction

Question 7

Lighter gases such as helium are used in deep diving mixes partly because, by Graham's Law, they do what?

Accepted Answer

Diffuse faster and are less narcotic

Answer

Dissolve more than nitrogen

Answer

Increase oxygen toxicity risk

Answer

Raise chamber temperature