BSAC sports diver theory
What causes a neap tide? - CORRECT ANSWER-When the Moon is at a right angle to
Earth and the Sun, creating the least amount of gravitational pull in one direction,
creating weak tides.
What causes spring tides? - CORRECT ANSWER-The gravity of the sun and moon pull
in the same direction, creating strong tides.
Neap tides coincide with what? - CORRECT ANSWER-The quarters of the moon
Spring tides coincide with what? - CORRECT ANSWER-New and full moon
What's the average tide cycle in most places? - CORRECT ANSWER-12 hours
How many tide cycles in a day? - CORRECT ANSWER-2
When can a sports diver dive with an ocean diver or another sports diver? - CORRECT
ANSWER-In conditions already encountered by the ocean diver during their training and
under the supervision of a dive manager.
What's the initial limited depth for a sports diver? - CORRECT ANSWER-20m
What's the progressively extended depth of a sports diver? - CORRECT ANSWER-35m
Is a neap tide small or large? - CORRECT ANSWER-Small
Is a spring tide small or large? - CORRECT ANSWER-Large
How many high tides in a day? - CORRECT ANSWER-2
How many low tides are there in a day? - CORRECT ANSWER-2
How many times do spring tides occur in a lunar month? - CORRECT ANSWER-2
How many times do neap tides occur in a lunar month? - CORRECT ANSWER-2
What's the tidal range? - CORRECT ANSWER-High water - low water
What's slack water? - CORRECT ANSWER-At the tides turning point, when the water
speed is at its slowest.
, What can make diving on a static site (e.g. a wreck) safer? - CORRECT ANSWER-
Diving in slack water
What is ground swell? - CORRECT ANSWER-When wind causing wave action on the
surface can be felt on the sea bed.
When is ground swell the roughest? - CORRECT ANSWER-When the surface winds go
against the tide/stream/current flow.
Is an incoming or outgoing tide better for visibility? - CORRECT ANSWER-Incoming
What are five factors that can affect visibility? - CORRECT ANSWER-- bad weather
- tides
- being close to river estuaries
- lots of phytoplankton + zooplankton (most likely to be a problem in spring in most
places.)
-disturbance by divers.
What's a thermocline? - CORRECT ANSWER-Sudden change in temperature, may look
oily/ shiny and produce a change in visibility
What can you do to reduce the effect of glare on the surface (as a boat crew member,
not a diver?) - CORRECT ANSWER-- wear polarised sunglasses
- position the boat with the sun behind you
What are four things you should take into account when doing a risk assessment? -
CORRECT ANSWER-Conditions, depth, breathing gas and equipment
As neoprene wetsuits compress, there is a loss of what? - CORRECT ANSWER-
Thermal insulation
What precautions can you take to minimise the risk of a dive to yourself and your
buddy? - CORRECT ANSWER--don't dive if you're unsure
- service equipment
- back up supply of gas
- pre agreed narcosis check (at agreed depth or gas level)
- practiced rescue skills
-
What are the four practised rescue skills you'll do as a sports diver? - CORRECT
ANSWER-CBL/AS, basic life support (BLS), rescue breathing (RB), chest compressions
(CC)
What's the in water life support sequence? (6) - CORRECT ANSWER-- make bouyant
- shout for help
What causes a neap tide? - CORRECT ANSWER-When the Moon is at a right angle to
Earth and the Sun, creating the least amount of gravitational pull in one direction,
creating weak tides.
What causes spring tides? - CORRECT ANSWER-The gravity of the sun and moon pull
in the same direction, creating strong tides.
Neap tides coincide with what? - CORRECT ANSWER-The quarters of the moon
Spring tides coincide with what? - CORRECT ANSWER-New and full moon
What's the average tide cycle in most places? - CORRECT ANSWER-12 hours
How many tide cycles in a day? - CORRECT ANSWER-2
When can a sports diver dive with an ocean diver or another sports diver? - CORRECT
ANSWER-In conditions already encountered by the ocean diver during their training and
under the supervision of a dive manager.
What's the initial limited depth for a sports diver? - CORRECT ANSWER-20m
What's the progressively extended depth of a sports diver? - CORRECT ANSWER-35m
Is a neap tide small or large? - CORRECT ANSWER-Small
Is a spring tide small or large? - CORRECT ANSWER-Large
How many high tides in a day? - CORRECT ANSWER-2
How many low tides are there in a day? - CORRECT ANSWER-2
How many times do spring tides occur in a lunar month? - CORRECT ANSWER-2
How many times do neap tides occur in a lunar month? - CORRECT ANSWER-2
What's the tidal range? - CORRECT ANSWER-High water - low water
What's slack water? - CORRECT ANSWER-At the tides turning point, when the water
speed is at its slowest.
, What can make diving on a static site (e.g. a wreck) safer? - CORRECT ANSWER-
Diving in slack water
What is ground swell? - CORRECT ANSWER-When wind causing wave action on the
surface can be felt on the sea bed.
When is ground swell the roughest? - CORRECT ANSWER-When the surface winds go
against the tide/stream/current flow.
Is an incoming or outgoing tide better for visibility? - CORRECT ANSWER-Incoming
What are five factors that can affect visibility? - CORRECT ANSWER-- bad weather
- tides
- being close to river estuaries
- lots of phytoplankton + zooplankton (most likely to be a problem in spring in most
places.)
-disturbance by divers.
What's a thermocline? - CORRECT ANSWER-Sudden change in temperature, may look
oily/ shiny and produce a change in visibility
What can you do to reduce the effect of glare on the surface (as a boat crew member,
not a diver?) - CORRECT ANSWER-- wear polarised sunglasses
- position the boat with the sun behind you
What are four things you should take into account when doing a risk assessment? -
CORRECT ANSWER-Conditions, depth, breathing gas and equipment
As neoprene wetsuits compress, there is a loss of what? - CORRECT ANSWER-
Thermal insulation
What precautions can you take to minimise the risk of a dive to yourself and your
buddy? - CORRECT ANSWER--don't dive if you're unsure
- service equipment
- back up supply of gas
- pre agreed narcosis check (at agreed depth or gas level)
- practiced rescue skills
-
What are the four practised rescue skills you'll do as a sports diver? - CORRECT
ANSWER-CBL/AS, basic life support (BLS), rescue breathing (RB), chest compressions
(CC)
What's the in water life support sequence? (6) - CORRECT ANSWER-- make bouyant
- shout for help
