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Questions involving pressure in Physics

Questions involving pressure

Questions involving pressure are physics questions that test your understanding of the concept of pressure, how it is calculated, and how it applies in solids, liquids, and gases.

They may involve:

  • Calculating pressure using formulas
  • Explaining real-life applications
  • Understanding liquid pressure
  • Understanding atmospheric pressure
  • Applying Blaise Pascal’s Principle

Here are questions involving pressure

  1. The figure below shows Hare’s apparatus used for comparing liquid densities.
Questions involving pressure-the hare's apparatus

Use the information given in the above diagram to calculate the density of liquid x given that density of water is 1000kgm-3        (2mks)

answer

$$ \delta_w g h_w = \delta_wgh_x $$ $$delta_x = \frac{1000 \times 30}{25} = 1200kgm^{-3}$$ $$1000 \times 30 = \delta_x \times 25 \ $$

2. Figure 3 below shows a student drinking a soda using a straw.

drinking from a straw in a question involving pressure from the atmosphere

Figure 3

. Explain why the soda rises up a straw when the student sucked on it.                 (2mks)

answer

Sucking decreases pressure inside the straw; and the greater atmospheric pressure pushes the soda up.

3. Using the idea of particles explain why the pressure inside the tyre increases when the tyre is pumped up     (2mks)

answer

When more air is pumped into the tyre the number of particles colliding with the walls increases; They increase the rate of change in momentum, hence the force per unit area increases;       

4. Explain why a hole in a ship near the bottom is more dangerous than one nearer the surface.(2mks)

answer

Pressure in liquids increases with depth ; hence water will enter the ship at a higher rate making it to sink

5. The atmospheric pressure at the foot of Mt. Longonot is 760mm of mercury while at the peak of the mountain, the atmospheric pressure is 580mm of mercury. Given that the density of mercury is 13600Kg/m3, Calculate the height of the mountain (density of air = 1.3 Kg/m3.) (3mks)

Answer

Pressure difference = 760 – 580 = 180mmHg;
Pressure due to liquid column = ρgh – 0.18 x 10 x 13600 = 1.3 x h x 10;
H = 1883.1m;

6. Use fig. 3 below to answer questions 3 and 4.


Three identical tubes containing mercury were inverted as shown.

Explain the effect on the level of mercury in tube A if region X is filled with some air. (2 mks)

answer

The vertical height of mercury would be less than 76 cm. The trapped air would exert pressure on the column of mercury.

Indicate on the diagram above the levels of mercury in tube B and C. (1 mk)

answer

                                                                 

                                                                     

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