871 . Which port is used by Simple Mail Transfer Protocol?

A. 21
B. 25
C. 34
D. 55

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Answer: Option B

Explanation:

Simple Mail Transfer Protocol (SMTP) uses several ports, with port 25 being the original and often unencrypted standard, port 587 being the recommended secure port for email submission, and port 465 being a legacy port for secure, implicit TLS connections

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সমন্বিত পাঁচ ব্যাংক || অফিসার ক্যাশ - 06.11.2021

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872 . Which one of the following is not a computer language ?

A. PASCAL
B. UNIX
C. FORTRAN
D. COBOL

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Answer: Option B

Explanation:

Unix is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix, development starting in the 1970s at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and others.

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বিসিআইসি | সহকারী প্রকৌশলী (কমার্শিয়াল) | 10-12-2021

873 . Which one of the following function is strictly bounded?

A. $x^{- 2}$
B. $e^{x}$
C. $x^{2}$
D. $e^{- x^{2}}$

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Answer: Option D

Explanation:

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বাংলাদেশ পল্লী বিদ্যুতায়ন বোর্ড (BREB) || সহকারী জেনারেল ম্যানেজার (ওএন্ডএম/ইএন্ডসি /পিএন্ডএম) (ইলেকট্রিক্যাল এন্ড ইলেকট্রনিক) (10-05-2024) || 2024

A. Human error
B. Internet error
C. Monitor error
D. Software error

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Answer: Option A

Explanation:

Human error: This is a common type of programming error, where the programmer makes a mistake in the code.
Software error: This refers to a flaw in the software itself, which can be caused by human error during development.
Monitor error: This refers to a problem with the display device, not the programming. While a monitor issue might indirectly affect debugging, it's not a fundamental error in the program itself.

Why "Internet error" is incorrect:
An internet error is a network connectivity issue, like a slow connection or a website being down. This is external to the computer program and its code. While internet errors might prevent a program from running properly or accessing data, they are not considered a programming error per se. They are a network issue.

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Microcredit Regulatory Authority (সহকারী পরিচালক) 05-03-2021

A. Articial intelligence
B. Machine Learning
C. Reality
D. Reality

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Answer: Option B

Explanation:

Machine learning is a subset of artificial intelligence (AI) where algorithms are designed to learn from data and make predictions or decisions based on patterns they identify, allowing them to improve their accuracy over time without being explicitly programmed.
Why other options are incorrect:

1. Artificial Intelligence (AI): While AI encompasses machine learning, it is a broader term referring to the development of computer systems capable of simulating intelligent behavior. Machine learning is a specific technique within AI that focuses on using data to train algorithms.
3. Reality: Reality refers to the actual state of things, distinct from virtual simulations or computer models. It is not related to the process of making predictions or decisions using algorithms.

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Faculty of Arts and Social Science (FASS) 2023-2024

A. Ctrl + F3
B. Ctrl + Shift + F3
C. Shift + F3
D. Alt + F3

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Answer: Option C

Explanation:

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বাংলাদেশ রপ্তানি প্রক্রিয়াকরণ কর্তৃপক্ষ (সহকারী ম্যানেজার) 02-04-2021

A. Google
B. Yahoo
C. MSN
D. Windows

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Answer: Option D

Explanation:

গুগল, ইয়াহু এবং এমএসএন সকলেই সুপরিচিত ইন্টারনেট সার্চ ইঞ্জিন। অন্যদিকে, উইন্ডোজ হল মাইক্রোসফট দ্বারা তৈরি একটি অপারেটিং সিস্টেম। একটি অপারেটিং সিস্টেম একটি কম্পিউটারের হার্ডওয়্যার এবং সফ্টওয়্যার রিসোর্স পরিচালনা করে, ইন্টারনেটে অনুসন্ধান করে না।
গুরুত্বপূর্ণ বিষয়:

সার্চ ইঞ্জিন: ব্যবহারকারী-নির্দিষ্ট কীওয়ার্ডের উপর ভিত্তি করে তথ্যের জন্য ইন্টারনেটে অনুসন্ধান করার জন্য ডিজাইন করা একটি সফ্টওয়্যার অ্যাপ্লিকেশন।
অপারেটিং সিস্টেম: একটি কম্পিউটারের হার্ডওয়্যার এবং রিসোর্স পরিচালনা করে এমন সফ্টওয়্যার।

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সহকারী পরিচালক(AD) -12.11.2021

A. SSD
B. Cache
C. RAM
D. ROM

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Answer: Option B

Explanation:

Cache memory acts as a high-speed buffer between the CPU and main memory (RAM). It stores frequently accessed data and instructions, reducing the time the CPU spends waiting for data from the slower main memory.

Function: Cache memory is designed to be extremely fast and is located closer to the CPU.
Purpose: It stores copies of data and instructions that are likely to be needed by the CPU, allowing for quicker access than retrieving them from the main memory.
Benefit: By reducing the need to access RAM for every request, it significantly speeds up the overall performance of the computer.

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A. Alt+ delete
B. Ctrl+delete
C. shift +delete
D. End+ delete

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Answer: Option C

Explanation:

The key combination to permanently delete a file or folder is Shift + Delete. This action bypasses the Recycle Bin, and a confirmation prompt will appear before the item is permanently removed.

Select the file or folder you want to delete.
Press and hold the Shift key.
While holding Shift, press the Delete key.
Confirm the deletion in the pop-up window that appears.

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তিতাস গ্যাস ট্রান্সমিশন অ্যান্ড ডিস্ট্রিবিউসন কো. লি.-সহকারী ব্যবস্থাপক-08-10-2021

A. TTL
B. ECL
C. CMOS
D. All use same power

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Answer: Option C

Explanation:

The option that uses the least power is 3. CMOS.
Explanation: CMOS (Complementary Metal-Oxide-Semiconductor) logic circuits consume significantly less power compared to TTL (Transistor-Transistor Logic) and ECL (Emitter-Coupled Logic) because they only draw current during state transitions, meaning they use very little power when idle.
Why other options are incorrect:

TTL: TTL circuits have transistors continuously conducting current, resulting in higher power dissipation compared to CMOS.
ECL: ECL has the highest power consumption among the listed options due to its constant current requirement for maintaining differential amplifier operation.
All use same power: This is incorrect, as CMOS clearly consumes significantly less power than TTL and ECL.

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A. Arithmetic Unit
B. Logical Unit
C. Execution Unit
D. Memory

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Answer: Option D

Explanation:

A Hard Disk Drive (HDD) is not part of the Processing Unit (CPU). The CPU consists of the Control Unit (CU), Arithmetic Logic Unit (ALU), and Registers, while an HDD is a separate storage device. Other components like a graphic card or a mouse are also not part of the CPU, but rather separate hardware.
CPU Components

Control Unit (CU): Directs the operations of the processor by interpreting instructions and coordinating tasks.
Arithmetic Logic Unit (ALU): Performs mathematical and logical operations.
Registers: Small, high-speed storage locations within the CPU used to temporarily hold data and instructions.

Components not in the CPU

Hard Disk Drive (HDD): A long-term storage device for files, programs, and the operating system.
Graphic Card: A separate component designed specifically for rendering images and videos.
Mouse: An input device used for navigation and clicking.

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পাওয়ার গ্রিড কোম্পানি অব বাংলাদেশ (পিজিসিবি) লিঃ || উপ-সহকারী প্রকৌশলী (05-04-2024) || 2024

A. mechanic energy
B. kinetic energy
C. potential energy
D. elastic energy
E. None

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Answer: Option A

Explanation:

ঘূর্ণায়মান টারবাইন শ্যাফ্ট থেকে যান্ত্রিক শক্তি বৈদ্যুতিক শক্তি জেনারেটর চালানোর জন্য ব্যবহৃতহয় । টারবাইন একটি তরল পদার্থের (যেমন বাষ্প, জল, বা বাতাস) শক্তিকে এই ঘূর্ণনশীল যান্ত্রিক শক্তিতে রূপান্তরিত করে, যা পরে জেনারেটরকে ঘুরিয়ে দেয়, যান্ত্রিক শক্তিকে বৈদ্যুতিক শক্তিতে রূপান্তরিত করে।

টারবাইনের ভূমিকা: টারবাইনটি চলমান তরল থেকে শক্তি গ্রহণ করে, যেমন বাষ্প, বাতাস বা জলের গতিশক্তি। এটি এই শক্তি ব্যবহার করে তার ব্লেড এবং সংযুক্ত শ্যাফ্ট ঘোরায়, একটি প্রক্রিয়া যা তরলের শক্তিকে যান্ত্রিক শক্তিতে রূপান্তরিত করে।
জেনারেটরের ভূমিকা: জেনারেটরটি সরাসরি টারবাইনের শ্যাফটের সাথে সংযুক্ত থাকে। টারবাইন যখন শ্যাফ্ট ঘুরায়, তখন জেনারেটরের অভ্যন্তরীণ উপাদানগুলি (যেমন চুম্বকযুক্ত রটার এবং তারের কয়েল) নড়াচড়া করে। তড়িৎ চৌম্বকীয় আবেশের নীতির উপর ভিত্তি করে এই গতিবিধি বৈদ্যুতিক প্রবাহ উৎপন্ন করে।

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পায়রা বন্দর কর্তৃপক্ষ (বিভিন্ন পদ) 06-11-2020

A. Monitor
B. Hardware
C. Computer
D. Robot

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Answer: Option C

Explanation:

The term "Silico Sapiens" is a nickname for a computer, used as a play on words with Homo sapiens (wise humans) to describe a "silicon-based" intelligent machine. It highlights the silicon components, such as microchips, that form the "brain" of a computer, enabling it to process information.

"Silico": Refers to silicon, the main element used in the production of microchips and other computer components.
"Sapiens": Is a Latin word meaning "wise" or "astute," which is the species name for modern humans (Homo sapiens).
The connection: The term combines these two concepts to humorously describe a computer as a "wise" machine made of silicon, due to its processing capabilities.

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পাওয়ার গ্রিড বাংলাদেশ পিএলসি || কারিগরি সহায়ক/অফিস সহায়ক (15-11-2024) || 2024

A. Shift+Find
B. Alt+F
C. Shift +F
D. Ctrl+F

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Answer: Option D

Explanation:

The Ctrl+F command is used to search for anything in MS-Word, opening the Navigation pane where you can type your search query. You can also access this feature by going to the Home tab and selecting Find from the editing group.

Keyboard shortcut: Press Ctrl+F on Windows or Cmd+F on Mac.
Using the ribbon: Navigate to the Home tab, then click Find in the Editing group on the far right.
How it works: A search bar or Navigation pane will appear. As you type, Word will highlight all instances of your search term in the document and show the results in the pane

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বাংলাদেশ সিকিউরিটি প্রিন্টিং কর্পোরেশন || Assistant Manager (Production Control) (08-09-2023) || 2023

A. Octal
B. Binary
C. Decimal
D. Hexadecimal

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Answer: Option B

Explanation:

The binary number system (base-2) is the most commonly used numbering system in computer science because computers are built on electronic switches that can be either on or off, represented by the digits 1 and 0. While binary is the fundamental system, hexadecimal (base-16) is also widely used in programming as a more compact way for humans to represent binary data.
Binary (base-2)

How it works: Uses only two digits, 0 and 1.
Why it's used: Directly corresponds to the on/off states of transistors in computer circuits. A '1' can represent "on" and a '0' can represent "off".
In practice: Every piece of data, from numbers to letters, is represented as a combination of 0s and 1s, with each digit being called a bit.

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বাংলাদেশ সিকিউরিটি প্রিন্টিং কর্পোরেশন || Assistant Manager (Production Control) (08-09-2023) || 2023

871 . Which port is used by Simple Mail Transfer Protocol?

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872 . Which one of the following is not a computer language ?

874 . Which one is not the error of computer programming?

875 . Which of the following terms is used for computer algorithms to make predictions and decisions?

876 . Which of the following keyboard shortcut is used to change the name?

877 . Which of the following is not an internet search engine?

878 . Which memory acts as a buffer between CPU and main memory?

879 . Which key combination is used to permanently delete a fire of folder?

880 . Which is the following use least power?

881 . Which is not part of Processing Unit?

882 . Which energy generated in a turbine is used to run electric power generator linked to the turbine shaft?

883 . Which device is called Sillico Sapiens.

884 . Which command is used to search anything in MS-Word?

885 . Which base numbering system is commonly used in computer science ?

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