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Grade 7: Computing subject test

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Subject practice test

Choose an answer for each problem. Explain your method on paper, then use the feedback to decide what to revisit.

1. Classroom encoding stores 15 characters at exactly 4 bytes each. Storage excluding all overhead?19 bytes15 bytes61 bytes60 bytes

2. Record 1B3A. Decode the stated run-length record.AAABBAABAAABBBA

3. A set retains distinct source values but discards their repeated occurrences and original ordering. Which combined description is supported?Only repetitions are lost; order is preservedDistinct membership remains; repetitions and original order are lostOnly order is lost; repetitions are preservedAll values, repetitions and positions remain recoverable

4. A private document has a role-based reading rule. Which mechanism or policy is explicitly described?Access permission ruleRepresentation encodingKeyed encryption mechanismUnsupported confidentiality claim

5. Model’s guessed reusable flag. Classify the field in the stated supervised model.FeatureTraining labelUnavailable future outcomePrediction

6. Held-out fictional test: 12 predictions correct out of 15. Accuracy percentage?81%400%80%125%

7. Positive guess matching a positive label. Positive means reusable. Classify the prediction against its known label.Correct negativeCorrect positiveFalse positiveFalse negative

8. Choose rules using the supposed test labels. Which evidence role is described?Tuned-on evaluation setTraining performanceUntouched test evidenceNo labeled evaluation

9. Function prints status and returns a count. Classify the stated function behavior.Returns onlyPrints only, returns NoneNeither, returns NonePrints and returns

10. Two distinct calls use separate temporary n values. Which role is described?Returned resultExternal side effectIndependent same-name localsLocal temporary

11. Sequence the separate helpers. Which helper fits the stated job?Format messageCoordinate the workflowValidate recordCalculate total

12. Makes no network request. Classify this contract statement.Side-effect boundaryInput requirementOutput guaranteeExample only

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