BSAC sports diver theory Test Questions with Correct Solutions, Rated A+

How many low tides are there in a day? - Correct Solution 2 How many times do spring tides occur in a lunar month? - Correct Solution 2 How many times do neap tides occur in a lunar month? - Correct Solution 2 What's the tidal range? - Correct Solution High water - low water What's slack water? - Correct Solution 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 Solution Diving in slack water What is ground swell? - Correct Solution When wind causing wave action on the surface can be felt on the sea bed. When is ground swell the roughest? - Correct Solution When the surface winds go against the tide/stream/current flow. Is an incoming or outgoing tide better for visibility? - Correct Solution Incoming What are five factors that can affect visibility? - Correct Solution - 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 Solution 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 Solution - 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 Solution Conditions, depth, breathing gas and equipment As neoprene wetsuits compress, there is a loss of what? - Correct Solution Thermal insulation What precautions can you take to minimise the risk of a dive to yourself and your buddy? - Correct Solution -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 - When can a sports diver dive with an ocean diver or another sports diver? - Correct Solution 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 Solution 20m What's the progressively extended depth of a sports diver? - Correct Solution 35m Is a neap tide small or large? - Correct Solution Small Is a spring tide small or large? - Correct Solution Large What causes a neap tide? - Correct Solution 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 Solution The gravity of the sun and moon pull in the same direction, creating strong tides. Neap tides coincide with what? - Correct Solution The quarters of the moon Spring tides coincide with what? - Correct Solution New and full moon What's the average tide cycle in most places? - Correct Solution 12 hours How many tide cycles in a day? - Correct Solution 2