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Computer Science Flashcards

6 cards from real EMSAT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. In EmSAT Computer Science, what is the binary representation of the decimal number 13?

    Answer: 1101

    13 in binary: 13 ÷ 2 = 6 remainder 1, 6 ÷ 2 = 3 remainder 0, 3 ÷ 2 = 1 remainder 1, 1 ÷ 2 = 0 remainder 1. Reading remainders bottom to top: 1101.

  2. What is the output of the following pseudocode: x = 5; y = 3; PRINT x + y * 2?

    Answer: 11

    Following order of operations (multiplication before addition): y * 2 = 6, then x + 6 = 5 + 6 = 11.

  3. Which data structure operates on a Last-In, First-Out (LIFO) principle?

    Answer: Stack

    A stack follows LIFO: the last element added (pushed) is the first element removed (popped), like a stack of plates.

  4. What is the purpose of a loop in programming?

    Answer: To repeat a block of code multiple times

    Loops (for, while, do-while) allow a block of code to execute repeatedly until a specified condition is met, reducing code repetition.

  5. What is an algorithm?

    Answer: A step-by-step procedure for solving a problem or completing a task

    An algorithm is a finite, well-defined sequence of steps or instructions designed to solve a specific problem or perform a computation.

  6. Which sorting algorithm has the best average-case time complexity?

    Answer: Merge Sort - O(n log n)

    Merge Sort has an average-case time complexity of O(n log n), which is better than the O(n²) complexity of Bubble, Selection, and Insertion Sort.

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Sources & references

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  1. emsat.moe.gov.ae — Test delivery, eligibility, time limit, retake fee, retake policy, score release, exam format, exam information · verified Oct 2026
  2. mohesr.gov.ae — Eligibility · verified Oct 2026