IDC Physics

QuizÂ by Tina Conrad

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26 questions

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- 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/conductionConvection/radiationConduction/convectionConduction/radiation60s
- Q2Water is able to conduct heat about ______ times faster than air.77510032002060s
- Q3A process called _________ refers to the tendency of light to ________ as it passes through two mediums with different densities.refraction/bendabsorption/change colordiffusion/bendturbidity/weaken60s
- Q4At 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/sunlightvisual reversal/depthvisual reversal/turbiditydistance perception/depth120s
- Q5The 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
- Q6Sound travels approximately _____ times faster in water than it does in air.fourtwotwentyten60s
- Q7Divers 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
- Q8Approximately 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 feet580 litres/16 cubic feet600 litres/18 cubic feetThe answer cannot be determined from the data provided.120s
- Q9A 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 feet127 litres/4.5 cubic feet69.1 litres/2.43 cubic feet67 litres/2.37 cubic feet120s
- Q10A 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 feet110 litres/4 cubic feet54.9 litres/2 cubic feet60 litres/2.16 cubic feet120s
- Q11What is the gauge pressure at 38 metres/125 feet of fresh water?4.8 atm gauge4.68 atm gauge3.8 atm gauge3.68 atm gauge120s
- Q12The absolute pressure in 15 metres/50 feet of seawater is:2.45 ata2.5 ata1.5 ata3 ata120s
- Q13If 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 liters1 liter3 liters4 liters120s
- Q14At 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
- Q15Approximately 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 liters160 liters40 liters200 liters120s