14 questionswith explanationsfor RSSB CET Graduation Level
While sending an e-mail, the addresses entered in which field receive the message but stay hidden from all other recipients?
Answer: (3) BCC
Explanation
BCC (Blind Carbon Copy) recipients get the mail, but their addresses are not shown to the other recipients; CC addresses are visible to all.
What is the main function of the Domain Name System (DNS) on the internet?
Answer: (1) Converting domain names into IP addresses
Explanation
DNS works like the internet's phone book: it converts easy-to-remember domain names into the numerical IP addresses that computers use.
Which of the following is an open-source operating system whose source code is freely available?
Answer: (4) Linux
Explanation
Linux is open-source; Windows, macOS and iOS are proprietary operating systems.
A website address begins with 'https://' and the browser shows a padlock symbol. What does the 'S' in HTTPS indicate?
Answer: (2) Secure: the data is encrypted using SSL/TLS
Explanation
HTTPS is HyperText Transfer Protocol Secure; it encrypts the data exchanged between the browser and the website using SSL/TLS.
Restarting a computer that is already switched on, without turning off its power, is called:
Answer: (3) Warm booting
Explanation
Warm booting is restarting a running computer (e.g. Restart); cold booting is starting it from a power-off state.
Match List-I (file extension) with List-II (type of file): List-I: A. .exe B. .pdf C. .mp4 D. .zip List-II: 1. Compressed archive 2. Executable program 3. Portable document 4. Video Choose the correct code:
Answer: (1) A-2, B-3, C-4, D-1
Explanation
.exe is an executable program, .pdf a Portable Document Format file, .mp4 a video file and .zip a compressed archive.
Which type of operating system must respond to inputs within a fixed, strict time limit and is used in systems such as air-traffic control and industrial robots?
Answer: (2) Real-time OS
Explanation
A real-time operating system (RTOS) guarantees a response within a defined time, which is essential in control systems like air-traffic control and robotics.
Match List-I (protocol) with List-II (main use): List-I: A. FTP B. POP3 C. HTTP D. DHCP List-II: 1. Automatically assigns IP addresses to devices on a network 2. Downloads e-mail from a mail server to the user's device 3. Transfers files between computers 4. Transfers web pages from a web server to a browser Choose the correct code:
Answer: (4) A-3, B-2, C-4, D-1
Explanation
FTP (File Transfer Protocol) moves files, POP3 (Post Office Protocol 3) downloads mail from a server, HTTP carries web pages and DHCP assigns IP addresses automatically.
Match List-I (Windows 11 keyboard shortcut) with List-II (action): List-I A. Windows logo key + Shift + S B. Windows logo key + V C. Windows logo key + Print Screen D. Windows logo key + period (.) List-II i. Open the emoji panel ii. Open the clipboard history iii. Select a region of the screen and capture it to the clipboard iv. Capture the full screen and save it as a file in the Screenshots folder
Answer: (4) A-iii, B-ii, C-iv, D-i
Explanation
Microsoft Support (Windows keyboard shortcuts) lists Windows + Shift + S to select a region and copy it to the clipboard, Windows + V for clipboard history, Windows + Print Screen to save a full-screen shot as a file in the Screenshots folder, and Windows + period for the emoji panel. The two screenshot keys are easy to swap: Shift + S only copies a chosen region to the clipboard, while Print Screen with the Windows key saves a file.
Which e-mail protocol keeps the mail on the mail server so that folders and the read or unread status stay the same on every device used to open the mailbox?
Answer: (2) IMAP
Explanation
IMAP (Internet Message Access Protocol) leaves mail on the server and synchronises it across devices. POP3 usually downloads the mail to one device (and normally removes it from the server); SMTP only sends mail.
Which networking device connects two different networks, such as a home network and the internet, and forwards data packets between them?
Answer: (3) Router
Explanation
A router reads the IP address of each packet and forwards it towards its destination network. A hub only repeats signals to all its ports, and a repeater only regenerates a weak signal.
Which of the following statements about the star topology of a computer network is NOT correct?
Answer: (4) All devices share one backbone cable with terminators at both ends.
Explanation
A single shared backbone cable with terminators describes the bus topology, not the star. In a star each device has its own link to the hub or switch, so one cable fault isolates only that device, but a hub or switch failure stops the network.
Web pages shown in a browser are mainly written in which language, whose tags define the headings, paragraphs, links and images of a page?
Answer: (4) HTML
Explanation
HTML (HyperText Markup Language) marks up the content of a web page with tags such as <h1>, <p> and <a>; CSS then styles it. HTTP is only the protocol that transfers pages, and SQL is for databases.
Which of the following operating systems is NOT built on the Linux kernel?
Answer: (4) iOS
Explanation
Apple's iOS, like macOS, runs on the XNU kernel of Darwin. Android (Google) uses a modified Linux kernel, ChromeOS is also Linux-based, and Ubuntu is a Linux distribution.