◀ 11.4b11.4c11.5 ▶

11.4c — MC Practice 3 + Written-Response Drill

The last practice before exam eve: a mixed set under compressed time, then a timed written-response block with your PPR — the same 60-minute pairing the real exam gives you, in miniature. Today you rehearse STAMINA, not just facts.

Practice Set 315 questions, 13 min

15 questions in 13 minutes. Mixed, all ten families, compressed time. Answer every question — there is no penalty for guessing, and a blank scores like a wrong one. When the timer stops, press Grade this set for your scorecard and the family error table.

1. A packet arrives at a router. The destination computer is on a different network. What does the router do with the packet?CSN-1

AIt sends a copy to every device it is connected to, and the destination keeps the one addressed to itBIt forwards the packet toward the destination using the destination address, choosing among the paths it knows aboutCIt reads the packet's contents to decide whether the message is importantDIt stores the packet until the destination computer requests it

2. The list holds five elements. The program removes elements while iterating. What does the loop display?AAP-2

aList ← [5, 10, 15, 20, 25]
i ← 1
REPEAT UNTIL (i > LENGTH(aList))
{
    DISPLAY(aList[i])
    REMOVE(aList, i)
}

A5 10 15 20 25B5 15 25C5 10 15DThe program errors immediately

3. A student writes the same 12-line block of code in four different places. Which change best improves the program's design, and why?AAP-3

AShorten each block to 8 lines so the program is smallerBExtract the block into a procedure with parameters and call it four times, so the logic exists in one place and is easier to fix and readCRewrite the block in a different order at each siteDLeave the duplication, because the program already works

4. Which of the following loops never finishes?AAP-2

Ai ← 0 then REPEAT UNTIL (i = 5) { i ← i + 1 }Bi ← 0 then REPEAT UNTIL (i = 5) { i ← i + 2 }Ci ← 0 then REPEAT UNTIL (i = 5) { i ← i - 1 }Di ← 0 then REPEAT UNTIL (i > 5) { i ← i + 1 }

5. What is displayed?AAP-2

x ← 5
y ← 3
IF (x > 4 AND y > 4)
{
    DISPLAY("A")
}
ELSE
{
    DISPLAY("B")
}

AABBCABDNothing

6. A procedure assigns a value to a variable named total. A different procedure, elsewhere in the program, also uses a variable named total. Both procedures work correctly and do not interfere. What best explains this?AAP-1

AThe two variables are actually the same variable, and the program works by luckBEach variable is local to its procedure, so the two totals occupy separate storage and cannot overwrite each otherCThe program stores only one value and uses it for bothDVariables cannot be reused across procedures, so the program must have an error

7. Two students are paired on a programming project. Which activity is permitted under the College Board's collaboration rules?CRD-1

AOne student writes the entire program while the other watches, then both submit it as their own workBThe students discuss approaches and debug each other's code together, but each writes and submits their own programCStudents on a team copy one program and each submit identical copiesDCollaboration is not permitted at any point on programming projects

8. A program is written to compute a class average. A student tests it with the list [90, 80, 70] and gets 80, which is correct. The student declares the program finished. Which is the most significant weakness in this testing approach?CRD-2

AThe test used integers instead of decimalsBOnly one typical case was tested — no empty list, single element, or non-numeric input was checked, so untested paths remain unknownCThe average should have been roundedDNothing — one successful test is sufficient for a simple program

9. A hiring algorithm is trained on ten years of a company's past hiring decisions. It learns to favor candidates resembling those hired historically. Which concern does this best illustrate?IOC-1

AThe algorithm consumes too much computing powerBThe algorithm inherits and can amplify human bias present in its training data, producing discriminatory outcomes that appear objectiveCThe algorithm is too slow to be usefulDThe algorithm cannot be improved

10. A student downloads a copyrighted song and uses it as background music in a video posted publicly. Which statement is most accurate?IOC-1

AThis is always permitted because the video is for schoolBCopyright protects the song, and using it without permission or a license may infringe — educational use is not an automatic exemptionCThis is always permitted as long as the student credits the artistDCopyright does not apply to music distributed digitally

11. A hospital sends patient records between two buildings over the public internet. Which measure most directly protects the records from being read if intercepted in transit?IOC-1

ACompressing the records to reduce their sizeBEncrypting the records so the intercepted data is unreadable without the keyCStoring backup copies at both buildingsDSending the records twice so the second copy can be compared

12. Automation replaces many routine jobs in a factory while creating new roles for technicians who maintain the machines. Which statement best characterizes the effects of this change?IOC-1

AThe change is purely beneficial because productivity risesBThe change is purely harmful because jobs are lostCThe change produces both benefits and harms that are unevenly distributed — displaced workers and the newly skilled are not the same peopleDThe change has no measurable effect on employment

13. A microphone records a singer. Before the sound can be stored or processed by a computer, what must happen?DAT-1

AThe continuous sound wave must be sampled at intervals and each sample converted to a numeric valueBThe sound must be compressed losslesslyCThe sound must be encryptedDThe sound must be converted to text

14. A scatterplot of two variables shows points clustered closely along an upward-sloping line. What can be concluded?DAT-2

AThe two variables are positively correlatedBOne variable causes the other to increaseCThe two variables are unrelatedDThe dataset contains no outliers

15. A website sends its public key to a visitor's browser, which uses it to encrypt a message that only the website can decrypt. What property of public-key encryption makes this work?CSN-2

AThe public key and the private key are the same value, shared for convenienceBThe public key can encrypt, but only the mathematically related private key can decryptCThe public key encrypts and any browser can decrypt it with the same keyDEncryption is applied only after the message arrives at the server

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Error Table v3 ~5 min

Tighter than real: 13 minutes for 15 questions, where the exam gives you 120 for 70. That 50-second target deliberately overtrains pass-1 speed — if you can bubble at this pace here, May 14 will feel slow. The three-pass method is REQUIRED, not optional (bubbling discipline now, so it is reflex on exam day).

Score → error table v3, cumulative across sets 1–3. Your REAL study plan for the weekend comes from this table, not from your feelings about the exam.

WR Block ~25 min

Timed, PPR in hand, phone in bag: 4 prompts in 25 minutes (exam gives 60 for 4 with more writing — we compress to build the muscle):

MCQ-style: foreign code excerpt — describe input, behavior, output (reading pseudocode under time, not a WR prompt — 11.3 drill two)
WR2a-style: your algorithm, from your PPR
WR2b-style: your difficulty + specific fix
WR2c-style: your list's role in the program

Trade and grade with the claim-evidence-because rubric (11.3): does every answer name its evidence? Does anyone's WR2b name all three (bug, cause, fix)? Score each other like the College Board would — generous grading in practice is mean in May.

Socratic: Stamina, Not Just Facts

Where did your accuracy drop off in the compressed set — and was that a knowledge gap or an attention gap?Your answer
You ran the written block straight after the multiple choice, the way the exam does. What does your fourth prompt look like compared to your first?Your answer
You named your top three leaks for tomorrow. Which leak is a fact you can memorise tonight, and which is one you have to slow down for?Your answer

Checkpoint — before moving on, you must be able to:

Run pass-1 speed under 60 seconds per question
Complete 4 WR prompts inside 25 minutes with evidence
Show error tables v1–v3 and name your two weak families
Write your weekend plan from the table, not the vibes

Reference Docs

Need a deeper explanation? These pages cover the same concepts:

MC Strategy — pass timing targets
Written Responses — the rubric you graded with
Exam Reference Sheet — print it, hold it, love it

Next: 11.5 — Exam Eve: Logistics & Strategy

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