Liquid Pressure and Pressure

When blood pressure is measured, the cuff of the sphygmomanometer is wrapped round the upper arm and must be held at the level of the heart. Why?

• Blood pressure depends on the level of the blood.

• Blood pressure is normal when the cuff and heart are at the same level.

• Blood is able to flow easily to the wrist.

The pressure of sea water at the bottom of the sea is 1.2 × 108 N m–2.

Determine the depth of the sea.

[Density of sea water = 1020 kg m^–3]

• 1.18×10⁴ m

• 1.18×10⁵ m

• 1.18×10⁶ m

• 1.18×10⁹ m

Tags

NGSS.HS-PS2-4

A submarine has a surface area of 300 m².

The density of sea water is 1050 kg m^–3.

At what depth under the sea, will the additionalpressure on the submarine be 5 × 10⁵ Pa?

[Take g = 10 N kg^–1]

• 47.62 m

• 67.62 m

• 87.62 m

• 57.62 m

Tags

NGSS.HS-PS2-4

The figure below shows a reservoir on a hill. The reservoir supplies water to a water tank on a tall building.

Calculate the water pressure at X.

(Density of water = 1000 kg m^–3)

• 1.4×10⁹ Nm^–2

• 1.4×10² Nm^–2

• 1.4×10⁵ Nm^–2

• 1.4×10⁸ Nm^–2

A coin sinks to a depth of 5 m in a liquid of density 800 kg m^–3. At what depth, in a different liquid of density 600 kg m^–3, will the coin be subjected to the same pressure?

• 6.67 m

• 8.67 m

• 9.67 m

• 5.67 m

The figure shows a pond with two fish P and Q.

What is the correct relation of the water pressures on fish P and fish Q?

• Water pressure on fish Q > Water pressure on fish P.

• Water pressure on fish Q < Water pressure on fish P.

• Water pressure on fish Q = Water pressure on fish P.

The pressure of water exerted on the fishes is P_X, P_Y and P_Z respectively.
Which comparison is correct about the pressure exerted on the fishes?

• P_Z > P_Y > P_X 
• P_Z = P_X < P_Y
• P_Z = P_X > P_Y
• P_Z < P_X < P_Y

Calculate the pressure exerted by the water on the fish.
[Density of water = 1 000 kg m⁻³]

• 5 × 10⁴ Pa
• 5 × 10⁷ Pa
• 5 × 10⁶ Pa
• 5 × 10^-1 Pa

Which of the following graphs shows the correct relationship between water pressure, p and depth, h of the water?

• A
• B
• C
• D

Two identical containers containing liquid M and liquid N with 28 cm height and 20 cm height respectively. Both containers produce the same water spurt.
If the density of liquid M is 2.0 g cm⁻³, find the density of liquid N.

• 0.70 g cm⁻³
• 1.40 g cm⁻³
• 1.43 g cm⁻³
• 2.80 g cm⁻³

Tags

NGSS.HS-PS1-3