JKSSB Computer Awareness MCQs

Explanation

Correct Option: C) Computer understands only Binary Language

Explanation:
At the hardware level, a computer's CPU ultimately works with machine language, represented using binary digits (0 and 1).

• A) C Language ❌ — high-level programming language

• B) Assembly Language ❌ — low-level language that must be translated into machine code

• C) Binary Language ✅ — represents machine instructions as 0s and 1s

• D) BASIC ❌ — high-level programming language

Explanation

Correct Option: B) Statement 1 is true, Statement 2 is false

Explanation:

1. “The keyboard is an input device.” ✅ True
   A keyboard is a hardware input device used to enter text, numbers, and commands into a computer.

2. “MS Word is hardware.” ❌ False
   MS Word (Microsoft Word) is application software used for creating, editing, and formatting documents.

Explanation

Correct Option: C) Telnet

Explanation:
Telnet is a network protocol/service that allows a user to log in to and access another computer remotely over a network or the Internet.

• A) E-mail — used for sending and receiving electronic messages ❌

• B) Usenet — used for online discussion groups/news groups ❌

• C) Telnet — provides remote login/access to another computer ✅

• D) FTP — used for transferring files between computers ❌

Explanation

orrect Option: C) System Software

Explanation:
System software is designed to control and manage the operations of a computer system. It acts as an interface between the hardware and application software.

The main example is the Operating System (OS), which manages the CPU, memory, files, input/output devices, and other resources.

• A) User ❌ — Uses the computer but does not control its operations through software.

• B) Application Software ❌ — Performs specific user-oriented tasks.

• C) System Software ✅ — Controls and manages computer operations.

• D) Utility Software ❌ — Performs maintenance and optimization tasks.

Explanation

Correct Option: A) EDIC

Explanation:
EDIC is not a standard computer character code.

• A) EDIC ❌ — Not a standard computer code.

• B) ASCII ✅ — American Standard Code for Information Interchange.

• C) BCD ✅ — Binary-Coded Decimal.

• D) EBCDIC ✅ — Extended Binary Coded Decimal Interchange Code.

Explanation

Correct Option: B) 1, 2 and 4 only

Explanation:

1. Unicode was developed to represent characters from multiple languages. ✅
   Unicode provides a standard for representing characters from many writing systems and languages.

2. ASCII is a subset of Unicode. ✅
   The original 128 ASCII characters (0–127) are included in Unicode with the same code points.

3. Every Unicode character occupies exactly 16 bits. ❌
   Unicode is a character standard, not a fixed 16-bit encoding. Encodings such as UTF-8, UTF-16, and UTF-32 use different amounts of storage.

4. ASCII uses fewer characters than Unicode. ✅
   ASCII originally represents 128 characters, while Unicode supports a vastly larger character set.

Explanation

Correct Option: B) 1, 2 and 4 only

Explanation:

1. Cloud computing means data is stored on remote servers. ✅
   Cloud services generally store and process data on remote servers accessed over a network, usually the internet.

2. Cloud data ultimately resides on physical hardware. ✅
   Even though we call it the “cloud,” the data is ultimately stored on physical servers and storage devices in data centers.

3. Cloud computing eliminates the need for data centers. ❌
   Cloud computing depends on data centers. Cloud providers operate large data centers to provide computing and storage services.

4. Cloud services can be private, public, or hybrid. ✅
   These are common cloud deployment models:

   • Public cloud

   • Private cloud

   • Hybrid cloud

Explanation

Correct Option: C) 2, 3 and 4 only

Explanation:

1. A file extension determines the actual contents of a file. ❌
   The extension (such as .jpg, .txt, or .pdf) indicates the expected file type, but it does not determine or change the actual data stored inside the file.

2. Two files with different extensions may contain identical data. ✅
   Different extensions can be assigned to files containing the same underlying data, although the applications interpreting them may differ.

3. Changing a file extension does not necessarily change file content. ✅
   Renaming file.txt to file.jpg, for example, changes the name/extension, not the underlying data.

4. The operating system often uses extensions to identify file types. ✅
   Operating systems commonly use file extensions to determine which application should open a file.

Explanation

Correct Option: B) 1, 3 and 4 only

Explanation:

1. RAM is both readable and writable. ✅
   RAM allows data to be read from and written to during computer operation.

2. ROM can never be modified. ❌
   This is too absolute. Some types of ROM, such as PROM, EPROM, and EEPROM, can be programmed or modified.

3. EEPROM is a form of ROM. ✅
   EEPROM stands for Electrically Erasable Programmable Read-Only Memory and belongs to the ROM family.

4. EEPROM can be electrically erased. ✅
   As its name indicates, EEPROM can be erased and reprogrammed electrically.

Explanation

Correct Option: A) 1 and 3 only

Explanation:

1. A computer virus is a type of malware. ✅ Correct
   A virus is a type of malicious software (malware) designed to disrupt, damage, or gain unauthorized access to computer systems.

2. Every malware is a virus. ❌ Incorrect
   Malware is a broad category that includes viruses, worms, trojans, ransomware, spyware, etc. A virus is only one type of malware.

3. A worm can spread without attaching itself to another file. ✅ Correct
   Unlike a virus, a worm can self-replicate and spread independently, often across networks.

4. Antivirus software guarantees 100% protection. ❌ Incorrect
   Antivirus software significantly improves security but cannot guarantee complete protection against every threat.

Explanation

Correct Option: A) Only Statement 1 is true

Explanation:

1. “A computer can process data and produce information.” ✅ True
   Computers process input data according to programmed instructions and produce meaningful output/information.

2. “A computer can think and make decisions on its own like a human.” ❌ False
   A conventional computer does not independently think like a human. It follows programmed instructions and algorithms. Even AI systems make outputs based on models and data rather than human-like independent thought.

Explanation

Correct Option: C) 1, 2 and 3 only

Explanation:

1. Every cache miss results in data being fetched from RAM. ✅
   In the usual computer-memory hierarchy, when required data is not found in cache, it is retrieved from main memory (RAM).

2. Registers are generally faster than cache memory. ✅
   CPU registers are the fastest storage locations available to the processor, generally faster than cache.

3. Cache memory is used to reduce CPU waiting time. ✅
   Cache stores frequently/recently used data close to the CPU, reducing the time needed to access data from slower RAM.

4. Cache memory is part of secondary storage. ❌
   Cache is primary/internal high-speed memory, not secondary storage.

Explanation

• An operating system is necessary to run application software. ✅
  Application software generally relies on an operating system to provide services such as memory management, file handling, and hardware access.

• Some embedded systems can operate without a traditional operating system. ✅
  Simple embedded systems can run directly on hardware using firmware/bare-metal code, without a conventional OS.

• BIOS is loaded into RAM during booting. ❌
  The BIOS firmware is stored in non-volatile memory (traditionally ROM/flash). During boot, it executes from that firmware storage; it is not simply “loaded into RAM” as stated.

• BIOS is a type of application software. ❌
  BIOS is firmware/system software, not application software.

Explanation

Correct Option: D) SNARC

Explanation:
SNARC (Stochastic Neural Analog Reinforcement Calculator) is generally recognized as the first artificial neural network computer. It was developed in 1951 by Marvin Minsky and Dean Edmonds at Harvard.

• A) AN ❌

• B) AM ❌

• C) RFD ❌

• D) SNARC ✅

Explanation

Correct Option: C) 3 and 4 only

Explanation:

1. “Multiprocessing always requires multiple CPUs.” ❌ Incorrect
   Multiprocessing generally refers to using multiple processors/cores to execute processes simultaneously. However, the word always makes the statement too absolute in modern systems.

2. “Multitasking and multiprocessing are identical concepts.” ❌ Incorrect
   Multitasking means running multiple tasks apparently at the same time, while multiprocessing involves multiple processing units/cores.

3. “A single CPU can appear to run multiple tasks through time-sharing.” ✅ Correct
   A single CPU can rapidly switch between tasks, giving the appearance that they are running simultaneously.

4. “Modern operating systems support multitasking.” ✅ Correct
   Modern operating systems such as Windows, Linux, and macOS support multitasking.

Explanation

The Correct Answer is: Data can be accessed from multiple locations

Here is a quick breakdown of why this is the primary advantage and why the other options are incorrect:

• Data can be accessed from multiple locations: Because your data is stored on remote servers (the "cloud") rather than on a single physical hard drive in your home or office, you can log into your account and retrieve your files from any device, anywhere in the world, as long as you have an internet connection. This is also excellent for disaster recovery if your local devices are destroyed or lost.

• Requires no internet access: This is the opposite of how cloud backups work. You must have an active internet connection to upload (backup) or download (restore) your files to and from the cloud.

• Uses no storage space: It absolutely uses storage space; it just uses the storage space on a company's remote servers (like Google or Amazon) instead of the storage space on your physical computer.

• Eliminates the need for passwords: Cloud backups still require strict security measures, including strong passwords and often Two-Factor Authentication (2FA), to ensure that unauthorized people cannot access your private data over the internet.

Explanation

The Correct Answer is: Making copies of data for recovery purposes

Here is a quick breakdown of what a backup is and why the other options are incorrect:

• Making copies of data for recovery purposes: This is the exact definition of a data backup. The goal is to create a secure, redundant copy of your important information so that if the original data is lost, corrupted, or destroyed (due to hardware failure, malware, or accidental deletion), you can easily restore it.

• Deleting unwanted files: This is a method of freeing up storage space or organizing your system, which is unrelated to preserving data.

• Renaming files for hiding purposes: This is a very basic (and generally ineffective) way to obscure information, but it does nothing to protect the data from being lost or corrupted.

• Compressing files for future use: While data backups can be compressed (like into a .zip file) to save storage space, compression itself is just a technique for reducing file size, not a backup strategy on its own.

Explanation

The Correct Answer is: To retrieve or manipulate specific data

Here is a quick breakdown of why this is the correct choice and what the other options mean in the context of databases:

• To retrieve or manipulate specific data: A query is essentially a precise request or command you send to a database (often using a language like SQL). Its primary job is to ask the database a question (e.g., "Show me all customers from New York") or tell it to perform an action on the data (like updating, inserting, or deleting specific records).

• To print data: While you might eventually print the results you get from a query, the query itself does not physically print anything; it only fetches the information. Specialized reporting tools are usually used for formatting and printing.

• To create folders: Databases organize information using structures like tables, rows, columns, and schemas—not the standard file system folders you see on your desktop.

• To delete the database permanently: While there is a specific, highly destructive command you can run to wipe out an entire database (like DROP DATABASE in SQL), that is an administrative action, not the general, everyday purpose of a "query."

Explanation

The Correct Answer is: Microsoft Access

Here is a quick breakdown of why this is the correct choice and what the other options represent:

• Microsoft Access: This is a popular relational database management system (DBMS) developed by Microsoft. It is designed to store, manage, link, and query large sets of structured data.

• Microsoft World: This is not a real program. It is likely a typo for Microsoft Word, which is a word processor, not a database manager.

• Oracle Paint: This software does not exist. While Oracle is a massive tech company famous for its enterprise-grade database systems (Oracle Database), they do not produce a graphic design program called "Paint."

• Sequel pad: This is a made-up term, likely designed to confuse test-takers by combining the database language "SQL" (often pronounced sequel) with text editors like Notepad or WordPad.

Explanation

The Correct Answer is: Provide an extra layer of security during login

Here is a quick breakdown of how 2FA works and why the other options are incorrect:

• Two-Factor Authentication (2FA): This security method requires you to provide two distinct forms of identification before granting access to an account. The first factor is usually something you know (like your password), and the second is usually something you have (like a temporary code sent to your phone or generated by an authenticator app). This ensures that even if a hacker steals your password, they still cannot access your account without your physical device.

• Increase internet speed: This depends on your Internet Service Provider (ISP), bandwidth, and networking hardware (like routers), not security protocols.

• Reduce storage space: Managing storage space involves file compression, deleting old data, or using cloud storage, which is unrelated to logging in securely.

• Send automatic emails: This refers to email automation, autoresponders, or mailing list software, which has nothing to do with account authentication.

Explanation

The Correct Answer is: A cyberattack to steal sensitive information through fake messages or websites

Here is a quick breakdown of how phishing works and why the other options are incorrect:

• Phishing (The Cyberattack): This is a form of social engineering where an attacker masquerades as a trusted entity—like your bank, a popular streaming service, or even a colleague. They send fraudulent emails, texts, or instant messages designed to trick you into clicking a malicious link, downloading malware, or handing over sensitive data like passwords and credit card numbers.

• A method of computer repair: Fixing hardware or software issues has nothing to do with phishing, which is strictly a malicious activity.

• A type of web browser: Web browsers (like Chrome, Safari, or Edge) are the tools you use to access the internet. While a phishing attack might direct you to a fake website using a browser, the browser itself is not the attack.

• A cloud storage technique: Cloud storage involves saving data on remote servers (like Google Drive). Phishing is an attempt to steal your data, not a method of storing it.

Explanation

The Correct Answer is: Using internet based services for storage and computing

Here is a quick breakdown of why this is the correct choice and what the other options represent:

• Using internet based services for storage and computing: This is the core definition of cloud computing. Instead of relying on a local hard drive or a private on-site server, you are using a network of remote servers hosted on the internet to store, manage, and process data (like Google Drive, AWS, or Microsoft OneDrive).

• Storing data only on personal computers: This is the exact opposite of cloud computing. This is known as "local storage."

• Weather forecasting systems: While meteorologists use supercomputers (and often cloud computing) to model the weather, the term "cloud" in computing is a metaphor for the internet, not actual meteorological clouds.

• Computer networking cables: These represent the physical hardware (like Ethernet or fiber optic cables) used to connect devices locally or globally, rather than the distributed software and server services that define the cloud.

Explanation

The Correct Answer is SMTP

Here is a quick breakdown of what each of these protocols is used for:

• SMTP (Simple Mail Transfer Protocol): This is the standard protocol specifically designed for sending and routing email messages across the internet from one server to another.

• FTP (File Transfer Protocol): Used for transferring computer files between a client and a server on a computer network.

• HTTP (Hypertext Transfer Protocol): The foundation of data communication for the World Wide Web, used primarily for loading web pages and transmitting web content.

• TCP (Transmission Control Protocol): A core foundational protocol of the internet that establishes connections and ensures data packets are reliably delivered across a network. (SMTP actually relies on TCP as its underlying transport mechanism).

Explanation

The Correct Answer is: Uniform Resource Locator

Here is a quick breakdown of what a URL actually does and how it works:

• What it is: A URL is essentially the specific web address you type into a browser to find a particular webpage, image, file, or resource on the internet.

• How it works (The Anatomy of a URL): * Scheme (e.g., https://): Tells the browser which protocol to use to access the resource (secure web traffic).

  • Domain Name (e.g., www.google.com): Identifies the specific server or website where the resource is hosted.

  • Path (e.g., /search/images): Directs the browser to the specific folder or page within that website.

Explanation

The Correct Answer is BCC

Here is a quick breakdown of how these standard email fields work:

• BCC (Blind Carbon Copy): This field is used when you want to send an email to someone without the other recipients knowing. Any email address placed in the BCC field is hidden from everyone else who receives the email. It is highly useful for protecting privacy when sending emails to a large mailing list.

• To: This field is for the primary recipients of the email. Everyone listed here is visible to all other recipients.

• CC (Carbon Copy): This field is used to keep secondary recipients "in the loop" for informational purposes, even if no direct action is required from them. Like the "To" field, all email addresses here are visible to everyone.

• Subject: This is not a recipient field; it is the title or short summary of what the email is about, visible to all recipients before they open the message.

Explanation

The Correct Answer is 01010000

Here is a quick breakdown of why this is the correct choice and what the other strings represent:

• 01010000: This is the only string that consists exclusively of 0s and 1s, which is the fundamental requirement for binary (base-2) data.

• 00120000: This string contains a 2. The binary number system only uses two digits: 0 and 1. The presence of a 2 means this cannot be binary.

• 00fe0001: This string contains letters (f and e). This is an example of hexadecimal (base-16) data, which uses numbers 0-9 and letters A-F to represent values.

• 000A110: This string contains the letter A, which again indicates it is hexadecimal data, not binary.

Explanation

The Correct Answer is Now()

Here is a quick breakdown of what each of these functions does in Microsoft Excel:

• NOW(): This is a Date & Time function that returns the current system date and time. It updates automatically whenever the worksheet is recalculated or opened.

• FIND(): A Text function used to locate the starting position of a specific character or substring within a larger text string.

• MOD(): A Math & Trigonometry function that calculates and returns the remainder after a number is divided by a chosen divisor.

• MID(): A Text function used to extract a specific number of characters from the middle of a text string, starting at the exact position you specify.

Explanation

The Correct Answer is: Ctrl + E

Here is a quick breakdown of the standard keyboard shortcuts for the options you listed:

• Ctrl + E: Applies center alignment to the selected text or paragraph.

• Ctrl + S: Saves the current document.

• Ctrl + C: Copies the selected text or item to your clipboard.

• Ctrl + C + A: This is not a standard shortcut. However, Ctrl + A on its own is used to select all text in the document.

Explanation

The Correct Answer is 400%

Here is a quick breakdown of zoom capabilities in Microsoft Office applications for context:

• Microsoft PowerPoint: The maximum zoom level is 400%. This high level of magnification is particularly useful when you need to make precise adjustments to small shapes, text, animations, or graphics on a specific slide.

• Microsoft Excel: The maximum zoom level is also 400%.

• Microsoft Word: The maximum zoom level is slightly higher, allowing you to zoom in up to 500%.

Explanation

The Correct Answer is: Create a New Document

Here is a quick breakdown of the standard keyboard shortcuts for all the options you listed:

• Create a New Document: Ctrl + N

• Save the Document: Ctrl + S (Use F12 for "Save As")

• Open the Document: Ctrl + O

• Close the Document: Ctrl + W (or Ctrl + F4)