1sd-Exam

A divelog well kept is a document that shows the divers experience but is of much less value than a certificate.

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

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

The tendency of the body to float is:

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

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

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

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

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

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

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

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

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

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

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

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

Always have a keeper on _________________ side of the weightbelt from the buckle.

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

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

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

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

The pressure gauge shows the level of pressure in the ____________

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.

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.

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

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)

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

The mask headstrap must

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

Knifes must be used ________________________.

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

It is advisable to ________________ before entering the water.

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.

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:

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

Nitrogen narcosis effects different divers differently depending on the ___________________

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

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

The BCD is used to_____________________

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.

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?

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

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.

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

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

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

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

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