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Question 19M.3.HL.TZ1.b.iii

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.3.HL.TZ1.b.iii
Level HL Paper 3 Time zone TZ1
Command term Explain Question number b.iii Adapted from N/A
b.iii.
[Maximum mark: 2]
19M.3.HL.TZ1.b.iii

Gasoline of density 720 kg m–3 flows in a pipe of constant diameter.

The diameter at Y is made smaller than that at X. Explain why the pressure difference between X and Y will increase.

[2]

Markscheme

the fluid speed at Y will be greater «than that at X» ✔

reducing the pressure at Y
OR
the formula used to show that the difference is increased ✔

Examiners report

Sub-question iii) well discriminated between the better and weaker candidates. As weaker candidates often wrote that “lower diameter means higher pressure” without a direct reference to the greater speed at Y implying reduced pressure.

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