IDC Physics

QuizÂ 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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