1sd-Exam

The water pressure on the eardrum must be balanced by internal pressure so that it is not damaged. It is necessary to compensate ______________________, without waiting to feel the pain

The test of cylinder consists of checking inside and outside for corrosion and pressure resistance test using pressure of ________ higher than in normal use

By wearing a mask, an air space is placed between the diver’s eyes and the water so the objects can be_______________________

On resurfacing it may be necessary to ______________________ to obtain positive buoyancy or to be able to come out of the water more easily

Suits are protective clothing, which help to minimise thermal exposure effects on the body; this is due to the high thermal conductability of water. How much times higher is the water than air?

underwater the objects appear _____________by about 1/3, water also absorbs light, an effect that increases with wather depth.

Descending and ascending through the bubbles discharged by another diver below, can cause dizziness, try not to look at the bubbles.

It is advisable to ________________ before entering the water.

A floating buoy marks the presence of divers underwater. In some countries dive law requires ______________ flag known as an “A FLAG”

Several techniques exist for entering into the water these have always been developed with the safety of the ___________ as a primary consideration.

The BCD is used to_____________________

All weight belts must have a quick release buckle, which requires a positive action to open them

After commencing final descent check your buddies kit for any air leaks.

The BCD must be slowly deflated during ascent, because the air inside it expands and creates an ________________________and subsequent loss of control of speed. (max. 9 meter/minutes)

All the divers should have at least a basic understanding of first aid and O2 administration.

It is very important before assembly a regulator check the condition of______________

A personal dive computer can calculate the exact saturation state of our tissue

A body immersed in a fluid is ______________by the column fluid above it.

The pressure of the cylinder must be checked by taking 1 breaths from each regulator whilst watching the contents gauge.

During a dive careful attention needs to be paid to controlling the buoyancy, which should be_______________

While you dive, in order to evaluate the hydrostatic equilibrium, is important to consider the relation between volume and weight of:

our body contains cavities filled with gas that subjected with pressure are compensated for in two ways:

Every time we make a movement we use energy which asks more of our body, requiring a change in the ___________ in order to satisfy this new demand.

Begin the ascent with no less than _____________ in the cylinder.

Underwater it is always necessary to ____________ the mask

If we want to dive, ________________________, the B.C.D. must be deflated by using the exhaust valve.

Hypoxia refers to the situation in which the amount of oxygen required by the cell is less than that available to the body

In the case of loss of regulator it is necessary to ascent and continue to

When you plan a dive the first thing is to establish the maximum depth to be reached, for examples 13 metres, naturally considering 15 metres on the tables following down the column the limit of permanence at this depth is shown at 100 minutes. Planning to dive for 35 minutes, 30 minutes must be calculated. At this point on the right the corresponding dive letter group, in this case F is found.

Underwater sounds are transmitted ______________ because water has a greater density than air.

You finished your first dive with dive letter group F of nitrogen. Now, wanting to plan a second dive, after a break on the surface of 3 hours and 29 minutes, moving to the right to find the box corresponding to this time, we find the interval from 2 hours 29 minutes to 3 hours 57 minutes. Below the new dive letter group is indicated: in this case C.

The air that we breathe is composed of a mixture of gases, for simplicity let’s say that is made up mainly of________________________

The only effective treatment for air embolism syndrome is immediate recompression in a hyperbaric chamber and the administration of large quantity of __________ to make the blood more fluid and so reduce the risks of obstruction by the bubbles.

At a depth of 15 metres, the pressure inside the lungs will be the equivalent of the ambient pressure:

If you ascend too quickly the nitrogen is cannot be released quickly enough thus contributing to the formation of bubbles in the divers __________

Normally, ____________ breath is preceded by an increase in the breathing rate.

The speed at which sound travels through water makes it difficult for his senses to judge _______________

Knifes must be used ________________________.

“At a constant temperature the volume of a gas varies _____________ with absolute pressure while the density of a gas varies ________ with absolute pressure”

The lead weights usually are fixed to the weight belt; the belt should also...

During this course all dives will be performed within the limits of non-decompression

The pressure gauge shows the level of pressure in the ____________

The function of the respiratory organs is to supply the body with the gasses surrounding it; this is done by its absorption into the blood through the ____________

The most serious consequence of pulmonary overdistension is the passing of ________ bubbles from the alveoli into the blood stream and is commonly known as air embolism syndrome.

The function of the cardio-circolatory system is to transport and distribute oxygen and to remove residues and _____________

Before a dive it is good to carry out a thorough check with your buddy, helping him/her to prepare and put on the equipment before entering the water.

First aid for Decompression Sickness: the application of pure oxygen guarantees greater oxygenation of __________ and helps to lessen the risk of damage

The tendency of the body to float is:

The mask headstrap must

Descending underwater the increase in pressure is constant at ______ Atmosphere every 10 metres.