Pressure - Jamb Physics Past Questions and Answers

Question 41:

• JAMB 1998

The atmospheric pressure due to water is 1.3 x 10⁶Nm^-2. What is the total pressure at the bottom of an ocean 10m deep? [Density of water = 1000kgm^-3, g = 10ms^-2]

A. 1.3 x 10⁷Nm^-2
B. 1.4 x 10⁶Nm^-2
C. 1.4 x 10⁵Nm^-2
D. 1.0 x 10 ⁵Nm^-2

Question 42:

• JAMB 1999

The diagram above shows a lift pump with valves at P and Q. During a downward stroke of the piston

A. Both valves are open
B. P is open while Q is closed
C. P is closed while Q is open
D. Both valves are closed

Question 43:

• JAMB 1999

In the J-tube above, Y and X are on the same horizontal level and 30cm³ of air is trapped above Y when the atmospheric pressure is 75cm Hg, calculate the volume of air trapped above Y when 15cm Hg is now poured into the limb above X

A. 15 cm³
B. 25 cm³
C. 35 cm³
D. 45 cm³

Question 44:

• JAMB 2000

At a fixed point below a liquid surface, the pressure downwards is P1 and pressure upwards is P2. It can be deduced that

A. P₁ > P₂
B. P₁ ≥ P₂
C. P₁ < P₂
D. P₁ = P₂

Question 45:

• JAMB 2001

The height at which the atmosphere ceases to exist is about 80km. If the atmospheric pressure on the ground level is 760mmHg, the pressure at a height of 20km above the ground level is

A. 380mmHg
B. 570mmHg
C. 190mmHg
D. 480mmHg