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IDC Physics

Quiz by Tina Conrad

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26 questions
Show answers
  • Q1
    ___________, a form of heat transmission, has the greatest effect on heat loss in a diver while ________ is the form that has the least effect.
    Radiation/conduction
    Convection/radiation
    Conduction/convection
    Conduction/radiation
    60s
  • Q2
    Water is able to conduct heat about ______ times faster than air.
    775
    100
    3200
    20
    60s
  • Q3
    A process called _________ refers to the tendency of light to ________ as it passes through two mediums with different densities.
    refraction/bend
    absorption/change color
    diffusion/bend
    turbidity/weaken
    60s
  • Q4
    At times, objects viewed underwater appear more distant than they actually are. This phenomenon is called "_________" and the factor that primarily influences its occurrence is ___________.
    diffusion/sunlight
    visual reversal/depth
    visual reversal/turbidity
    distance perception/depth
    120s
  • Q5
    The density and elasticity of a medium have what effect upon the transmission of sound?
    Density and elasticity of a medium has no effect upon the transmission of sound.
    The denser and more elastic the medium, the poorer sound is transmitted.
    The denser and more elastic the medium, the less sound can be transmitted.
    The denser and more elastic the medium, the better the sound is transmitted.
    60s
  • Q6
    Sound travels approximately _____ times faster in water than it does in air.
    four
    two
    twenty
    ten
    60s
  • Q7
    Divers have difficulty determining the direction of sound underwater because:
    there is an insufficient delay between the sound striking one ear before the other.
    sound waves travel less efficiently underwater.
    the wetsuit hood makes it difficult to perceive sound as accurately as on land.
    water filling the ear canal reduces the ear's sensitivity to sound.
    60s
  • Q8
    Approximately how much air must be added to a lifting device to bring a 600 kilogram/1200 pound object to the surface? The object lies in 30 metres/100 feet of fresh water.
    620 litres/19 cubic feet
    580 litres/16 cubic feet
    600 litres/18 cubic feet
    The answer cannot be determined from the data provided.
    120s
  • Q9
    A 200 kilogram/440 pound anchor that displaces 127 litres/4.5 cubic feet of water lies on the bottom in 17 metres/56 feet of sea water. What is the minimum amount of water that must be displaced from a lifting device to bring the anchor to the surface?
    73 litres/2.55 cubic feet
    127 litres/4.5 cubic feet
    69.1 litres/2.43 cubic feet
    67 litres/2.37 cubic feet
    120s
  • Q10
    A 175 kilogram/385 pound cement block that displaces 115 litres/4 cubic feet of water lies on the bottom in 14 metres/46 feet of salt water. What is the minimum amount of water that must be displaced from a lifting device to bring the block to the surface?
    65 litres/2.34 cubic feet
    110 litres/4 cubic feet
    54.9 litres/2 cubic feet
    60 litres/2.16 cubic feet
    120s
  • Q11
    What is the gauge pressure at 38 metres/125 feet of fresh water?
    4.8 atm gauge
    4.68 atm gauge
    3.8 atm gauge
    3.68 atm gauge
    120s
  • Q12
    The absolute pressure in 15 metres/50 feet of seawater is:
    2.45 ata
    2.5 ata
    1.5 ata
    3 ata
    120s
  • Q13
    If a sealed, flexible, air-filled container with a volume of one liter at 20 metres/66 feet is released, what will its volume be when it reaches the surface (given that it doesn't explode)?
    2 liters
    1 liter
    3 liters
    4 liters
    120s
  • Q14
    At 40 metres/132 feet of salt water, a flexible container is filled to only 1/5 of its capacity. If this container is taken to 20 metres/66 feet, what will happen to the air volume inside?
    the air volume will increase by 5/3.
    the air volume will double.
    the air volume will decrease by 3/5.
    the volume will be the same at both depths.
    120s
  • Q15
    Approximately how much air must be pumped down from the surface to fill a 40-liter container if the container lies in 40 meters/ 132 feet of salt water?
    100 liters
    160 liters
    40 liters
    200 liters
    120s

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