1sd-Exam

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)

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

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

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

The change of dive letter group shows that the tissues have got rid of a part of the nitrogen during the interval on the surface. Now wanting to plan a second dive where the maximum depth must never exceed the previous one, in this case 14 metres for 25 minutes, the first thing is to find the minutes which penalise the dive and add them to the real dive time. To do this one follows down under letter C to the point corresponding to the maximum depth programmed, always calculating the higher figure. This cross check between letter C and the depth of 15 metres gives 21 minutes. This means that a dive of 25 minutes must be calculated at a total time of 46 minutes.

The rules for the prevention of decompression sickness can be divided as follows:

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

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

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

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

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

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

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

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

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

The ascent starts finning towards the surface, in order to control the speed; the B.C.D. must be ________________.

Every time that our body undergoes a loss of heat it responds by trying to maintain a constant temperature in the central zone. This is:

The pressure gauge shows the level of pressure in the ____________

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

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.

On dive tables the time and depth of the dive are correlated.

Knifes must be used ________________________.

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

The regulator enables the diver to breathe underwater. This part the equipment allows _________________.

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

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.

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 ____________

Underwater it is always necessary to ____________ the mask

The BCD is used to_____________________

It is advisable to ________________ before entering the water.

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

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?

The tendency of the body to float is:

The “Octopus” It is fixed to _____________________ of the first stage through a hose than the normal one.

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

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

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

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

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

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.

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.

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

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.

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

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

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

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

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

The mask headstrap must

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