SDI Divemaster Actual Questions and
Answers with Verified Rationales, 100%
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Gauge Pressure ✔✔CORRECT ANSWERS✔✔The manner in which a
diver's instruments measure and display pressure-related information.
It disregards atmospheric pressure and only provides a measurement of
the actual force being exerted by another source of pressure.
Bar Conversion ✔✔CORRECT ANSWERS✔✔= psi / 14.7
Psi Conversion ✔✔CORRECT ANSWERS✔✔= bar x 14.7
Meters Conversion ✔✔CORRECT ANSWERS✔✔= feet / 3.3
Feet Conversion ✔✔CORRECT ANSWERS✔✔= meters x 3.3
Depth to Pressure Calculation (Seawater) ✔✔CORRECT ANSWERS✔✔=
(meters / 10) + 1
= (meters + 10) / 10
= (feet / 33) + 1
,= (feet + 33) / 33
Pressure to Depth Calculation (Seawater) ✔✔CORRECT ANSWERS✔✔=
(bar - 1) x 10
= (bar x 10) - 10
= (atm - 1) x 33
= (atm x 33) - 33
Depth to Pressure Calculation (Freshwater) ✔✔CORRECT
ANSWERS✔✔= (meters / 10.3) + 1
= (meters + 10.3) / 10.3
= (feet /34) + 1
= (feet + 34) / 34
Pressure to Depth Calculation (Freshwater) ✔✔CORRECT
ANSWERS✔✔= (bar - 1) x 10.3
= (bar x 10.3) - 10.3
= (atm - 1) x 34
= (atm x 34) - 34
Seawater to Freshwater ✔✔CORRECT ANSWERS✔✔= msw x 1.03
= fsw x 1.03
, Freshwater to Seawater ✔✔CORRECT ANSWERS✔✔= mfw / 1.03
= ffw / 1.03
Boyle's Law ✔✔CORRECT ANSWERS✔✔Any change in pressure applied
upon a fixed amount of gas at a constant temperature will result in a
corresponding and inversely proportional change in the volume of that
gas.
P1V1 = P2V2
Effects of Boyle's Law ✔✔CORRECT ANSWERS✔✔- Lungs (Breathe
continuously)
-Middle Ears and Nasal Sinuses (Clear ears)
-Mask Squeeze
Air in the BCD/Dry Suit ✔✔CORRECT ANSWERS✔✔To maintain proper
buoyancy control the diver needs to add air during descent and vent air
during ascent.
Lung Rupture ✔✔CORRECT ANSWERS✔✔Can be caused by a diver
holding their breath while ascending to a shallower depth.
Air Density ✔✔CORRECT ANSWERS✔✔Increases at depth, which may
make breathing difficult if the diver overexerts himself.
Answers with Verified Rationales, 100%
Guarantee Pass.
Gauge Pressure ✔✔CORRECT ANSWERS✔✔The manner in which a
diver's instruments measure and display pressure-related information.
It disregards atmospheric pressure and only provides a measurement of
the actual force being exerted by another source of pressure.
Bar Conversion ✔✔CORRECT ANSWERS✔✔= psi / 14.7
Psi Conversion ✔✔CORRECT ANSWERS✔✔= bar x 14.7
Meters Conversion ✔✔CORRECT ANSWERS✔✔= feet / 3.3
Feet Conversion ✔✔CORRECT ANSWERS✔✔= meters x 3.3
Depth to Pressure Calculation (Seawater) ✔✔CORRECT ANSWERS✔✔=
(meters / 10) + 1
= (meters + 10) / 10
= (feet / 33) + 1
,= (feet + 33) / 33
Pressure to Depth Calculation (Seawater) ✔✔CORRECT ANSWERS✔✔=
(bar - 1) x 10
= (bar x 10) - 10
= (atm - 1) x 33
= (atm x 33) - 33
Depth to Pressure Calculation (Freshwater) ✔✔CORRECT
ANSWERS✔✔= (meters / 10.3) + 1
= (meters + 10.3) / 10.3
= (feet /34) + 1
= (feet + 34) / 34
Pressure to Depth Calculation (Freshwater) ✔✔CORRECT
ANSWERS✔✔= (bar - 1) x 10.3
= (bar x 10.3) - 10.3
= (atm - 1) x 34
= (atm x 34) - 34
Seawater to Freshwater ✔✔CORRECT ANSWERS✔✔= msw x 1.03
= fsw x 1.03
, Freshwater to Seawater ✔✔CORRECT ANSWERS✔✔= mfw / 1.03
= ffw / 1.03
Boyle's Law ✔✔CORRECT ANSWERS✔✔Any change in pressure applied
upon a fixed amount of gas at a constant temperature will result in a
corresponding and inversely proportional change in the volume of that
gas.
P1V1 = P2V2
Effects of Boyle's Law ✔✔CORRECT ANSWERS✔✔- Lungs (Breathe
continuously)
-Middle Ears and Nasal Sinuses (Clear ears)
-Mask Squeeze
Air in the BCD/Dry Suit ✔✔CORRECT ANSWERS✔✔To maintain proper
buoyancy control the diver needs to add air during descent and vent air
during ascent.
Lung Rupture ✔✔CORRECT ANSWERS✔✔Can be caused by a diver
holding their breath while ascending to a shallower depth.
Air Density ✔✔CORRECT ANSWERS✔✔Increases at depth, which may
make breathing difficult if the diver overexerts himself.
