O-LevelPhysicsForces5054/21 · Oct/Nov 2019 · Q16 Marks
Fig. 1.1 shows a tube full of mercury placed upside down in a dish of mercury. Initially a small piece of glass closes the open end of the tube. [Figure 1.1] [Figure 1.2]
- (a)(i)Explain why the level of mercury in the tube falls.[2]
- (a)(ii)State what is found at point X in Fig. 1.2.[1]
- (b)Describe how the tube of mercury in Fig. 1.2 is used to determine a value for the atmospheric pressure in pascals (Pa). You may draw on Fig. 1.2 if you wish.[3]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2019). The mark or mark type is shown in brackets.
- [B1] pressure due to mercury (in tube) is greater than pressure due to atmosphere (+ small height of mercury)
- [B1] (resultant) force downwards and mercury flows out of tube
- [B1] vacuum or nothing or mercury vapour
- [B1] height of mercury column mentioned
- [C1] height of mercury column above level in dish measured
- [A1] candidate suggests use of p = hpg and h in metres (m)
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