EmSAT Computer Science

Question 1

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

Accepted Answer

1101

Answer

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.

Question 2

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

Accepted Answer

11

Answer

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

Question 3

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

Accepted Answer

Stack

Answer

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

Question 4

What is the purpose of a loop in programming?

Accepted Answer

To repeat a block of code multiple times

Answer

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

Question 5

What is an algorithm?

Accepted Answer

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

Answer

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

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