Computer Science/IT MCQs
Topic Notes: Computer Science/IT
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
4571
Which is a second-generation cellular phone system?
Answer:
All of the above
Both D-AMPS (Digital-AMPS) and GSM (Global System for Mobile Communications) are digital standards that represent 2G technology.
4572
Which of the following is NOT a common component of an email address?
Answer:
Protocol type
An email address typically consists of a username, an '@' symbol, and a domain name. Protocol types (like 'http' or 'SMTP') are not part of the email address itself.
4573
Which term is commonly used to describe unsolicited and often unwanted electronic messages, typically sent in bulk?
Answer:
Spam
Unsolicited and unwanted electronic messages, particularly those sent in large quantities, are universally known as 'spam.' This term originated from a Monty Python sketch and has since become synonymous with junk email. While phishing, malware, and adware are related cybersecurity threats often delivered via unwanted emails, 'spam' specifically refers to the bulk delivery of such messages or other unsolicited content. Phishing is a type of spam designed to trick recipients into revealing sensitive information, malware refers to malicious software, and adware is software that automatically displays or downloads advertising material.
4574
Which factor is most likely to affect the speed of email delivery?
Answer:
Network congestion and server load.
Email delivery speed is primarily influenced by network congestion on the internet and the load on the sending and receiving mail servers. Client-side factors like color scheme or signature complexity have no impact.
4575
ADSL, SDSL, HDSL, and VDSL are all types of \_\_\_\_.
Answer:
Digital subscriber lines
These are all varieties of Digital Subscriber Line (DSL) technology, which provides internet access over telephone lines.
4576
Which network component is responsible for translating domain names into IP addresses for email delivery?
Answer:
DNS server
DNS (Domain Name System) servers are responsible for resolving domain names (like google.com) into their corresponding IP addresses, which is crucial for mail servers to locate each other and deliver emails.
4577
Which protocol is responsible for securing communication channels over a computer network, commonly used for secure web browsing and email services?
Answer:
SSL/TLS
SSL (Secure Sockets Layer) and its successor TLS (Transport Layer Security) are cryptographic protocols that provide secure communication over a network. They are fundamental for securing HTTPS (web) and secure email protocols (SMTPS, IMAPS, POP3S).
4578
Based on the Clos criteria, if N = 200, what must n be at minimum?
Answer:
10
The Clos criteria for a non-blocking switch states n ≥ (N/2)^(1/2). For N=200, n ≥ (100)^(1/2), so n must be at least 10.
4579
Which of the following is an email client?
Answer:
Outlook Express
An email client is a desktop application that allows you to send, receive, and manage your emails. Outlook Express (and its modern successors like Microsoft Outlook or Mozilla Thunderbird) is a classic example of an email client, whereas the others are web browsers or file managers.
4580
What technology enables real-time chatting over the internet?
Answer:
Instant Messaging
Instant messaging lets users exchange messages instantly, often with presence detection. [cite: 247]