Structured programming and subroutines (procedures and functions)

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Question 27

An environmental monitoring grid measures river contamination levels across several parallel sensor lines, each having multiple detection nodes. A researcher wants to write a script to monitor the first sensor line (index 0) to detect a localized contamination spike.

Write a Python program to:

Check that along the first sensor line (index 0):
- the contamination level at node 1 is strictly greater than the contamination level at node 0
- the contamination level at node 2 is strictly greater than the contamination level at node 1
Display Spike when both conditions are met (indicating a continuous, strict increase).
Display Stable when the conditions are not met.

You must use the getContamination subroutine described below in your Python code.

Subroutine

Subroutine	Purpose
`getContamination(line, node)`	Returns the contamination level (as an integer) detected at `(line, node)`

Figure 1: Example A (Spike detected)

	node 0	node 1	node 2
line 0	12	18	25
line 1	10	11	9

For Example A, the program should display Spike (since 12 < 18 < 25).

Figure 2: Example B (Stable status)

	node 0	node 1	node 2
line 0	15	14	20
line 1	8	12	11

For Example B, the program should display Stable (since 14 is not greater than 15).

[4]

Write a Python program to:

Check that along the first sensor line (index 0):
- the contamination level at node 1 is strictly greater than the contamination level at node 0
- the contamination level at node 2 is strictly greater than the contamination level at node 1
Display Spike when both conditions are met (indicating a continuous, strict increase).
Display Stable when the conditions are not met.

You must use the getContamination subroutine described below in your Python code.

Subroutine

Subroutine	Purpose
`getContamination(line, node)`	Returns the contamination level (as an integer) detected at `(line, node)`

Figure 1: Example A (Spike detected)

	node 0	node 1	node 2
line 0	12	18	25
line 1	10	11	9

For Example A, the program should display Spike (since 12 < 18 < 25).

Figure 2: Example B (Stable status)

	node 0	node 1	node 2
line 0	15	14	20
line 1	8	12	11

For Example B, the program should display Stable (since 14 is not greater than 15).

Structured programming and subroutines (procedures and functions)

Question 27

Subroutine

Figure 1: Example A (Spike detected)

Figure 2: Example B (Stable status)

Markscheme

Structured programming and subroutines (procedures and functions)

Question 27

Subroutine

Figure 1: Example A (Spike detected)

Figure 2: Example B (Stable status)

Markscheme

Structured programming and subroutines (procedures and functions)

Question 27

Subroutine

Figure 1: Example A (Spike detected)

Figure 2: Example B (Stable status)

Structured programming and subroutines (procedures and functions) Questions

Structured programming and subroutines (procedures and functions)

Question 27

Subroutine

Figure 1: Example A (Spike detected)

Figure 2: Example B (Stable status)

Structured programming and subroutines (procedures and functions) Questions