What is the binary equivalent of the decimal number 9?

• 1001

• 1100

• 1010

• 0110

• 1111

Answer explanation

To convert the decimal number 9 to binary, divide by 2 and record the remainders. 9 ÷ 2 = 4 remainder 1, 4 ÷ 2 = 2 remainder 0, 2 ÷ 2 = 1 remainder 0, 1 ÷ 2 = 0 remainder 1. Reading the remainders from bottom to top gives 1001.

Which of the following is an example of system software?

• Microsoft Word

• Google Chrome

• Linux OS

• Photoshop

• Facebook

Answer explanation

Linux OS is system software that manages hardware and software resources, while Microsoft Word, Google Chrome, Photoshop, and Facebook are application software designed for specific tasks.

In databases, what does the term 'primary key' refer to?

• A key used to open database files

• A unique identifier for records in a table

• A method to delete tables

• A type of data encryption

• A table's main column

Answer explanation

A 'primary key' is a unique identifier for records in a table, ensuring that each record can be uniquely distinguished from others. This is crucial for maintaining data integrity and enabling efficient data retrieval.

Which of the following is a cloud storage service?

• Apache

• Dropbox

• Chrome

• Microsoft Office

• SQL Server

Answer explanation

Dropbox is a cloud storage service that allows users to store and share files online. The other options, such as Apache, Chrome, Microsoft Office, and SQL Server, do not provide cloud storage functionalities.

What is the most significant function of the Arithmetic Logic Unit (ALU)?

• Managing the input/output devices

• Controlling the memory

• Performing mathematical and logical operations

• Managing power supply

• Managing operating system processes

Answer explanation

The most significant function of the Arithmetic Logic Unit (ALU) is performing mathematical and logical operations, which are essential for processing data and executing instructions in a computer.

Which of the following is a volatile memory type?

• SSD

• RAM

• DVD

• HDD

• USB Flash Drive

Answer explanation

RAM (Random Access Memory) is a type of volatile memory, meaning it loses its data when power is turned off. In contrast, SSDs, HDDs, DVDs, and USB Flash Drives are non-volatile, retaining data without power.

Which of the following is an open-source operating system?

• macOS

• Linux

• Windows 10

• DOS

• iOS

Answer explanation

Linux is an open-source operating system, meaning its source code is freely available for anyone to use, modify, and distribute. In contrast, macOS, Windows 10, and iOS are proprietary systems, and DOS is not considered open-source.

Which of these is not a type of network topology?

• Star

• Mesh

• Tree

• Loop

• Bus

Answer explanation

Loop is not a recognized network topology. The common types include Star, Mesh, Tree, and Bus, which describe different ways to connect devices in a network.

What does GUI stand for?

• General User Interface

• Graphic User Information

• Graphical User Interface

• Gateway Universal Interface

• General Utility Interface

Answer explanation

GUI stands for Graphical User Interface, which refers to a visual way for users to interact with computers using graphics and icons, making it easier to use software compared to text-based interfaces.

Which programming language is primarily used for Android app development?

• Python

• C++

• Java

• Ruby

• HTML

Answer explanation

Java is the primary programming language for Android app development, as it provides the necessary tools and libraries for building Android applications. Other languages like Python and Ruby are not commonly used for this purpose.