# Test: PADI Open Water Chapter One Quiz

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## A squeeze is:

a pressure imbalance in which pressure inside an air space exceeds pressure outside an air space, resulting in pain or discomfort a pressure imbalance in which pressure outside an air space exceeds pressure inside an air space, resulting in pain or discomfort

## An object will be more buoyant in _____ than it will be in _____.

fresh water, salt water salt water, fresh water

True False

True False

## What two pieces of equipment do you use to control your buoyancy?

BCD, fins BCD, lungs lead weight, BCD

## If a sealed, flexible bag of air is taken from the water surface to a depth of 30m/99ft, what is the Pressure on the bag, the Volume relative the the volume at the surface and the density o the air relative to the density at the surface

Depth Pressure Volume Density 0m/oft 1 bar/ata x 1 x 1 10m/33ft 2 bar/ata 1/2 x 2 20m/66ft 3 bar/ata 1/3 x 3 30m/99ft 4 bar/ata 1/4 x 4 40m/132ft 5 bar/ata 1/5 x 5 5 bar/ata, 1/5, X5 3 bar/ata, 1/3, X3 4 bar/ata, 1/4, X4 2 bar/ata, 1/2, X2

## An object is positively buoyant when:

It displaces a volume of water weighing less than its own weight It displaces a volume of water weighing more than its own weight It displaces a volume of water weighing equal to its own weight

## You usually only feel pressure in body air spaces because:

Your body is mostly made of incompressable liquid, but air is compressible and changes volume with pressure changes. Water is denser than air, which resists pressure better

True False

O