EmSAT Computer Science 4

Question 1

What is the decimal value of the binary number 1011?

Accepted Answer

11

Answer

1011 in binary = 1×8 + 0×4 + 1×2 + 1×1 = 8 + 0 + 2 + 1 = 11.

Question 2

Which sorting algorithm has a best-case time complexity of O(n)?

Accepted Answer

Bubble Sort

Answer

Bubble Sort has a best-case complexity of O(n) when the list is already sorted and no swaps are needed.

Question 3

In object-oriented programming, what is encapsulation?

Accepted Answer

Bundling data and methods that operate on it within a single unit

Answer

Encapsulation bundles data and related methods together and restricts direct access from outside.

Question 4

What does CSS stand for?

Accepted Answer

Cascading Style Sheets

Answer

CSS stands for Cascading Style Sheets, used to define the presentation of HTML documents.

Question 5

Which type of malware disguises itself as legitimate software to trick users into installing it?

Accepted Answer

Trojan Horse

Answer

A Trojan Horse disguises itself as useful software but performs malicious actions once installed.

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