SDI Scuba Exam:SDI: SDI Scuba Certification Exam Study
Guide:SDI Computer Nitrox Exam:SDI Scuba Exam
Objects under water appear:
A. The same size as they do on land.
B. Twice as large as they do on land.
C. Closer and larger than they do on land.
D. Smaller and farther away than they do on land. - ANSWER:C. Closer and larger than they do on land.
Which of the following is/are true?
A. Tides seldom have a significant impact on depth or dive plans.
B. Strong tidal currents frequently bring clearer water with them.
C. Tidal currents can be very strong, making diving difficult or even dangerous.
D. None of the above. - ANSWER:C. Tidal currents can be very strong, making diving difficult or even
dangerous.
Which of the following is not true?
A. Longshore currents always move in the same direction.
B. Wind, waves and tides are among the factors that can affect the direction of longshore currents.
C. Longshore currents frequently move in the same direction as permanent offshore currents.
D. Local dive operators are a good source of information on the behavior of longshore currents. -
ANSWER:A. Longshore currents always move in the same direction.
Which of the following is/are true?
A. If caught in a rip current, swim directly towards shore, using the most powerful kick possible.
B. If caught in a rip current, swim perpendicular to shore, until you are completely out of the rip current,
then swim in towards shore.
C. If caught in a rip current, swim parallel to shore, until you are completely out of the rip current, then
swim in towards shore.
D. Don't fight the rip current relax and let it carry you closer to shore. - ANSWER:C. If caught in a rip
current, swim parallel to shore, until you are completely out of the rip current, then swim in towards
shore.
Which of the following statements are true?
, A. Wave height is the distance from its highest point (crest) to its lowest point (trough).
B. Wave length is the distance from crest to crest.
C. Wave oscillation to calculated by multiplying the wave height times its length.
D. Both the first and second answers are correct. - ANSWER:D. Both the first and second answers are
correct.
As you descend:
A. Colors will remain largely the same.
B. Blues and grays disappear quickly.
C. Dive lights have little effect on apparent color.
D. None of the above. - ANSWER:D. None of the above.
Which of the following is/are true?
A. Water is 400 times denser than air.
B. Water is 800 times denser than air.
C. Sound travels approximately four times faster under water.
D. Both the second and third answers are correct. - ANSWER:D. Both the second and third answers are
correct.
Which of the following is/are true?
A. Water conducts heat away from your body ten times faster than air does.
B. Water conducts heat away from your body 25 times faster than air does.
C. Fresh water conducts heat away from your body faster than salt water does.
D. Salt water conducts heat away from your body faster than fresh water does - ANSWER:B. Water
conducts heat away from your body 25 times faster than air does.
The presence of thermoclines means that:
A. Surface temperatures will provide divers with a good indication of what they can expect at depth.
B. Divers may require less in the way of exposure protection at depth than they will at the sur- face.
C. Divers may require more in the way of expo- sure protection at depth than they will at the surface.
D. None of the above. - ANSWER:C. Divers may require more in the way of expo- sure protection at
depth than they will at the surface.
Which of the following is not true?
A. Entering shallow water causes the base of a wave to slow.
Guide:SDI Computer Nitrox Exam:SDI Scuba Exam
Objects under water appear:
A. The same size as they do on land.
B. Twice as large as they do on land.
C. Closer and larger than they do on land.
D. Smaller and farther away than they do on land. - ANSWER:C. Closer and larger than they do on land.
Which of the following is/are true?
A. Tides seldom have a significant impact on depth or dive plans.
B. Strong tidal currents frequently bring clearer water with them.
C. Tidal currents can be very strong, making diving difficult or even dangerous.
D. None of the above. - ANSWER:C. Tidal currents can be very strong, making diving difficult or even
dangerous.
Which of the following is not true?
A. Longshore currents always move in the same direction.
B. Wind, waves and tides are among the factors that can affect the direction of longshore currents.
C. Longshore currents frequently move in the same direction as permanent offshore currents.
D. Local dive operators are a good source of information on the behavior of longshore currents. -
ANSWER:A. Longshore currents always move in the same direction.
Which of the following is/are true?
A. If caught in a rip current, swim directly towards shore, using the most powerful kick possible.
B. If caught in a rip current, swim perpendicular to shore, until you are completely out of the rip current,
then swim in towards shore.
C. If caught in a rip current, swim parallel to shore, until you are completely out of the rip current, then
swim in towards shore.
D. Don't fight the rip current relax and let it carry you closer to shore. - ANSWER:C. If caught in a rip
current, swim parallel to shore, until you are completely out of the rip current, then swim in towards
shore.
Which of the following statements are true?
, A. Wave height is the distance from its highest point (crest) to its lowest point (trough).
B. Wave length is the distance from crest to crest.
C. Wave oscillation to calculated by multiplying the wave height times its length.
D. Both the first and second answers are correct. - ANSWER:D. Both the first and second answers are
correct.
As you descend:
A. Colors will remain largely the same.
B. Blues and grays disappear quickly.
C. Dive lights have little effect on apparent color.
D. None of the above. - ANSWER:D. None of the above.
Which of the following is/are true?
A. Water is 400 times denser than air.
B. Water is 800 times denser than air.
C. Sound travels approximately four times faster under water.
D. Both the second and third answers are correct. - ANSWER:D. Both the second and third answers are
correct.
Which of the following is/are true?
A. Water conducts heat away from your body ten times faster than air does.
B. Water conducts heat away from your body 25 times faster than air does.
C. Fresh water conducts heat away from your body faster than salt water does.
D. Salt water conducts heat away from your body faster than fresh water does - ANSWER:B. Water
conducts heat away from your body 25 times faster than air does.
The presence of thermoclines means that:
A. Surface temperatures will provide divers with a good indication of what they can expect at depth.
B. Divers may require less in the way of exposure protection at depth than they will at the sur- face.
C. Divers may require more in the way of expo- sure protection at depth than they will at the surface.
D. None of the above. - ANSWER:C. Divers may require more in the way of expo- sure protection at
depth than they will at the surface.
Which of the following is not true?
A. Entering shallow water causes the base of a wave to slow.
