ICAS Digital Technologies 4 — Questions and Answers
Question 1: Which of the following is a primary function of an operating system?
- Edit photos
- Manage hardware resources and provide services to applications (Correct answer)
- Browse the internet
- Create spreadsheets
Correct answer: Manage hardware resources and provide services to applications
An operating system manages the computer's hardware resources (CPU, memory, storage) and provides a platform for applications to run.
Question 2: What is the role of a 'compiler' in programming?
- It runs the program one line at a time
- It translates the entire source code into machine code before running (Correct answer)
- It connects a program to the internet
- It stores variables in memory
Correct answer: It translates the entire source code into machine code before running
A compiler translates the entire high-level source code into machine code (or an intermediate form) all at once before execution.
Question 3: Which network topology connects all devices in a single continuous ring?
- Star topology
- Bus topology
- Ring topology (Correct answer)
- Mesh topology
Correct answer: Ring topology
In a ring topology, each device is connected to exactly two others, forming a closed loop for data to travel around.
Question 4: What does 'resolution' refer to when describing a digital image?
- The file size in kilobytes
- The number of pixels in the image (Correct answer)
- The color palette used
- The speed at which it loads
Correct answer: The number of pixels in the image
Image resolution refers to the number of pixels (picture elements) in an image, often expressed as width × height (e.g., 1920×1080).
Question 5: In HTML, which tag is used to create a hyperlink?
- <link>
- <a> (Correct answer)
- <href>
- <url>
Correct answer: <a>
The <a> (anchor) tag creates hyperlinks in HTML, using the href attribute to specify the destination URL.
Question 6: Which of the following BEST describes 'open-source software'?
- Software that costs nothing to use
- Software whose source code is publicly available for anyone to view and modify (Correct answer)
- Software developed by governments
- Software that works only on open networks
Correct answer: Software whose source code is publicly available for anyone to view and modify
Open-source software makes its source code publicly available, allowing anyone to inspect, modify, and distribute it.
Question 7: What happens when two computers on the same network send data at exactly the same time and their signals collide?
- The data is automatically encrypted
- A collision occurs and both computers must resend after a random delay (Correct answer)
- The faster computer's data is kept
- The network shuts down permanently
Correct answer: A collision occurs and both computers must resend after a random delay
In Ethernet networks, a collision causes both signals to be lost; CSMA/CD protocol detects this and each device waits a random time before retransmitting.
ICAS Digital Technologies 4
Which of the following is a primary function of an operating system?