Information technology MCQs
Showing 50 questions (Total: 2310)
The time complexity of binary search is :
Correct Answer:
D: logarithmic
Explanation:
The time complexity of binary search is : Correct Answer logarithmic In computer science, binary search, also known as half - interval search,logarithmic search,or binary chop, is a search algorithm that finds the position of a target value within a sorted array. Binary search compares the target value to the middle element of the array.
what is a long -term scheduler ?
Correct Answer:
B: It selects which process has to be executed nest and allocates CPU
Domain of a function is :
Correct Answer:
A: the maximal set of numbers for which a function is defined
For some base r, the digits which are allowed in its representation are?
Correct Answer:
B: Digits from 0 to r -1
RPC provides a (an) __ on the client side , a separate one for each remote procedure.
Correct Answer:
A: stub
Explanation:
RPC provides a (an) __ on the client side , a separate one for each remote procedure. Correct Answer stub Sentence টিতে `Sometimes' থাকায় এটি Present indefinite Tense হবে। সুতরাং `will' এর ব্যবহার ভূল।
An algorithm which uses the past results to find the new results is
Correct Answer:
C: Dynamic programming algorithms
Explanation:
An algorithm which uses the past results to find the new results is Correct Answer Dynamic programming algorithms Deterrent effect এমন প্রভাব যার কারণে অন্য কোনো অপরাধ সংগঠিত হয় না; waive মওকুফ করা। অর্থ্যাৎ আইন ভঙ্গের অপরাধ যদি প্রায়শই মওকুফ করা হয় তবে তা আইন ভঙ্গের শাস্তির প্রভাব কমিয়ে দেয়। সুতরাং সঠিক উত্তরটি (b)
which of these keywords can be used in a subclass to call the constructor of superclass?
Correct Answer:
C: Super
Explanation:
which of these keywords can be used in a subclass to call the constructor of superclass? Correct Answer Super The super keyword refers to superclass (parent) objects. It is used to call superclass methods, and to access the superclass constructor.
CPU fetches the instruction form memory according to the value of __
Correct Answer:
A: Program counter
Explanation:
CPU fetches the instruction form memory according to the value of __ Correct Answer Program counter The CPU fetches instructions from memory according to the value of the program counter. These instructions may cause additional loading from and storing to specific memory addresses. Usually, a program resides on a disk as a binary executable file.
what is the mounting of file system ?
Correct Answer:
C: attaching portion of the file system into a directory structure
Explanation:
what is the mounting of file system ? Correct Answer attaching portion of the file system into a directory structure Mounting is a process by which the operating system makes files and directories on a storage device (such as hard drive, CD - ROM, or network share) available for users to access via the computer's file system. In general, the process of mounting comprises the operating system acquiring access to the storage medium; recognizing, reading, and processing file system structure and metadata on it before registering them to the virtual file system (VFS) component.
Multi threaded programs are :
Correct Answer:
A: lesser prone to deadlocks
Explanation:
Multi threaded programs are : Correct Answer lesser prone to deadlocks A multi - threaded program will take advantage of additional threads — and cores — to distribute the load of the program more efficiently, as opposed to have one poor core do all the work while the others simply watch. The premise of concurrency is to run two or more different programs, kind of at the same time.
when there is a large logical address space, the best way of paging would be:
Correct Answer:
B: a tow level paging algorithm
Explanation:
when there is a large logical address space, the best way of paging would be: Correct Answer a tow level paging algorithm গত পঞ্চাশ বছরে In the last fifty years; অর্থাৎ In শব্দটি Missing রয়েছে। সুতরাংসঠিকউত্তরটিহবে(b)
A host machine is unable to communicate with Google server . Which command is the most appropriate to run at host machine to determine which intermediary device is responsible for this failure?
Correct Answer:
B: ping 192. 168.1.1
Explanation:
A host machine is unable to communicate with Google server . Which command is the most appropriate to run at host machine to determine which intermediary device is responsible for this failure? Correct Answer ping 192. 168.1.1 Ping responses overview Basically, this means the router didn't give the PC an IP address. In this case, check the following: Check the IP address of your router by using the IPCONFIG command in the Command prompt.
In the ___ normal form , a composite attribute is converted to individual attributes .
Correct Answer:
A: First
Suppose a C program has floating constant 1.414, what's the best way to convert this as 'float' data type?
Correct Answer:
C: 1,414f or 1.414 F
Explanation:
Suppose a C program has floating constant 1.414, what's the best way to convert this as 'float' data type? Correct Answer 1,414f or 1.414 F #include "stdio.h" int main() { printf("%d %d",sizeof(3.14F), sizeof(3.14L)); return 0; } Output: 4 16 উল্লেখ্য, Float এবং Integer Data Type এর জন্য কম্পিউটারে 4 Byte জায়গা প্রয়োজন। এছাড়া, Long Data Type এর জন্য 16 Byte জায়গা প্রয়োজন।
Consider the following variable declarations and definations in C . (i) int var _ 9 =1 ; (ii) int 9 _ var =2; (iii) int + =3; Choose the correct statement w.r.t above variables.
Correct Answer:
C: Both i. & iii. are valid
Explanation:
Consider the following variable declarations and definations in C . (i) int var _ 9 =1 ; (ii) int 9 _ var =2; (iii) int + =3; Choose the correct statement w.r.t above variables. Correct Answer Both i. & iii. are valid In C language, a variable name can consist of letters, digits and underscore i.e. _ . But a variable name has to start with either letter or underscore. It can't start with a digit. So valid variables are var_9 and _ from the above question. Even two back to back underscore i.e. __ is also a valid variable name. Even _9 is a valid variable. But 9var and 9_ are invalid variables in C.
Let x be an integer which can take a value of 0 or 1. The statement if (x == 0) x =1 ; else x =0 ; is equivalent to which one of the following ?
Correct Answer:
B: x =1 -x ;
Explanation:
Let x be an integer which can take a value of 0 or 1. The statement if (x == 0) x =1 ; else x =0 ; is equivalent to which one of the following ? Correct Answer x =1 -x ; Consider the option: x = 1 - x. Consider x = 0 ; x = 1 - 0 = 1 = > So when x = 0 we get x value to be 1. Consider x = 1 ; x = 1 - 1 = 0 = > So when x = 1 we get x value to be 0.
For a given integer, which of the following operators can be used to 'Set' and 'reset ' a particular bit respectively?
Correct Answer:
A: I and &
Which none of the following is an example of file compression software in a computer?
Correct Answer:
C: Win Zip
In a computer, WAV file format is associated with what type of files?
Correct Answer:
A: Video
Explanation:
In a computer, WAV file format is associated with what type of files? Correct Answer Video Video সংক্রান্ত কিছু ফাইলঃ WMV, mp4, DAT ইত্যাদি। Audio/Sound সংক্রান্ত কিছু ফাইলঃ WAV, mp3, aac ইত্যাদি। Image সংক্রান্ত কিছু ফাইলঃ jpeg, GIF, PNG ইত্যাদি। Document সংক্রান্ত কিছু ফাইলঃ doc, pdf, XML ইত্যাদি।
Which of the following occurs when software tries to access protected memory ?
Correct Answer:
A: Segmentation Fault
A collection of unprocessed items is____
Correct Answer:
B: data
Explanation:
A collection of unprocessed items is____ Correct Answer data Information is a collection of organised data but Data is a collection of unprocessed Items.
In a computer, which of the following keys you can use to get help in most of the programs?
Correct Answer:
C: F1
Explanation:
In a computer, which of the following keys you can use to get help in most of the programs? Correct Answer F1 F1 - Opens the "help" menu. F3 - activate a search function in applications F10 - activates the menu bar. ESC - interrupt or cancel the current process or running program.
If you wish to extend the length of the network without having the signal degrade, you would use a____
Correct Answer:
A: Repeater
Explanation:
If you wish to extend the length of the network without having the signal degrade, you would use a____ Correct Answer Repeater ১. একই নেটওয়ার্ক - এ একাধিক ডিভাইসের মধ্যে সংযোগ স্থাপন করে সুইচ। ২. দুইটি আলাদা নেটওয়ার্কের মধ্যে মধ্যে সংযোগ স্থাপন করে রাউটার। ৩. একটি নেটওয়ার্ক থেকে সম্পূর্ণভাবে বের হয়ে যাওয়ার জন্য অথবা একটি নেটওয়ার্কে'র একেবারে প্রথম পর্যায়ে ঢোকার জন্য যে ডিভাইস ব্যবহার করা হয় তাকে বলে গেটওয়ে।
Which disk is used to cold boot a PC?
Correct Answer:
B: System disk
Explanation:
Which disk is used to cold boot a PC? Correct Answer System disk It is the system disk because the other disks may boot a PC, but they also perform added functions beyond booting the PC.
Which of the following is not a logical function used in Ms- Excel?
Correct Answer:
B: ROUND
Which of the following is not a web browser?
Correct Answer:
D: Portal
Explanation:
Which of the following is not a web browser? Correct Answer Portal বর্তমানে ব্যবহৃত বিভিন্ন জনপ্রিয় ওয়েব ব্রাউজার গুলো হচ্ছে Opera, Firefox, Chrome, Internet explorer ইত্যাদি।
Ctrl, Shift and Alt are called _____keys.
Correct Answer:
C: modifier
Explanation:
Ctrl, Shift and Alt are called _____keys. Correct Answer modifier ১. কীবোর্ডে F1 থেকে F12 কী গুলোকে Function Key বলে। ২. ১, ২, ৩, ৪ ইত্যাদি সংখ্যাগুলোকে Numeric Key বলে। ৩. Ctrl, Shift, Alt ইত্যাদি কীগুলোকে Modifier key বলে।
Which of the following types of menu shows the further sub-choice?
Correct Answer:
D: Pull-down
what is an example of iteration in C?
Correct Answer:
D: all of the above
Explanation:
what is an example of iteration in C? Correct Answer all of the above একই কাজ (Operation) বারবার করার জন্য সি প্রোগ্রামিং ল্যাঙ্গুয়েজ - এ বিভিন্ন ফাংশন ব্যবহার করা হয় যার মধ্যে For loop, do... while statement, if… else statement উল্লেখযোগ্য।
A hard disk has the storage capacity of 80 GB. It can store a total of __
Correct Answer:
A: 80×230bytes information
Explanation:
A hard disk has the storage capacity of 80 GB. It can store a total of __ Correct Answer 80×230bytes information ১ গিগাবাইট = ২৩০ বাইট বা ১০২৪ মেগাবাইট সুতরাং ৮০ গিগাবাইট = ৮০*২৩০ byte information
(111111110)2=(?)10
Correct Answer:
C: 510
Explanation:
(111111110)2=(?)10 Correct Answer 510 এটি একটি বিশেষ একটি বিশেষ সিরিজ যার মাধ্যমে কোন সংখ্যাকে বাইনারিতে পরিবর্তন করা যায়। Series: 256 - 128 - 64 - 32 - 16 - 8 - 4 - 2 - 1 Count: 1 - 1 - 1 - 1 - 1 - 1 - 1 - 1 - 0 বাইনারি সংখ্যাটিকে Series সংখ্যাটির সাহায্যে পর্যায়ক্রমে কাউন্ট 1 বসাতে হবে। বসানো শেষ হলে যেই সংখ্যার নিচে 1 আছে, সেই সংখ্যাগুলোকে যোগ করতে হবে। এক্ষেত্রে ফলাফলঃ ২৫৬ + ১২৮ + ৬৪ + ৩২ + ১৬ + ৮ + ৪ + ২ = ৫১০।
An electronic path, that sends signals from one part of computer to another is a __
Correct Answer:
C: Bus
Explanation:
An electronic path, that sends signals from one part of computer to another is a __ Correct Answer Bus যে ইলেকট্রনিক পথে বৈদ্যুতিক সিগনাল বা সংকেত এক অংশ থেকে অন্য অংশে প্রেরিত হয় তাকে ইংরেজিতে BUS বলে। বিভিন্ন ধরনের BUS - এর মধ্যে আছে USB BUS, VESA BUS, PCI BUS ইত্যাদি।
How many time the following for loop will be executed ? unsigned int i for ( i=100; i > = 0, i --) printf ("%d", i)
Correct Answer:
B: 100
In computer terminology, OCR stands for
Correct Answer:
A: Optical Character Reader
Explanation:
In computer terminology, OCR stands for Correct Answer Optical Character Reader Optical character recognition or optical character reader (OCR) is the electronic or mechanical conversion of images of typed, handwritten or printed text into machine - encoded text, whether from a scanned document, a photo of a document, a scene - photo
Once information is input into a computer it becomes _
Correct Answer:
C: data
The operation of machining several surface of a workpiece simultaneously is called
Correct Answer:
C: gang milling
Which is the short-cut command (using key board) to add a new slide in a power point file?
Correct Answer:
A: Ctrl+m
Explanation:
Which is the short-cut command (using key board) to add a new slide in a power point file? Correct Answer Ctrl+m MS PowerPoint - এ Ctrl + M short cut - টি ব্যবহৃত হয় একটি project - এ নতুন স্লাইড creat বা add করতে ও Ctrl + N একটি নতুন presentation বা project তৈরি করতে। Ctrl + O হলো কোনো recent file open করার short cut এবং ctrl + P হলো কোনো পেইজ বা File Print করার short cut command।
What kind of storage device can be affeted be affected by fragmentation?
Correct Answer:
A: magnetic
Explanation:
What kind of storage device can be affeted be affected by fragmentation? Correct Answer magnetic হার্ডডিস্কে ডেটা যদি এলোমেলাভাবে বিন্যস্ত থাকে এবং এতে কম্পিউটার performance affected হয় অর্থাৎ গতি বা space কমে যায় তবে ঐ অবস্থাকে fragment বলে। Hard Disk একটি Magnetic storage device। Defragmentation - এর মাধ্যমে এ সমস্যা দূর করা যায়।
Ina spreadsheet, ____can help you make sense of a worksheet's computer memory?
Correct Answer:
B: labels
Explanation:
Ina spreadsheet, ____can help you make sense of a worksheet's computer memory? Correct Answer labels Excel worksheet - এর শুরুতে উপড়ের রো - এ ঐ sheet - টিতে উপস্থাপিত কন্টেন্ট (বিষয়বস্তু/তথ্যউপাত্ত) সম্পর্কে ধারণা পাওয়া যায়। যেমন, Label - এ যদি Product, Price , Tax, Total Amount - এ শব্দগুলো দেখা যায় তবে এখানে উল্লেখিত content - টি কোনো বাণিজ্যিক বা আর্থিক প্রতিষ্ঠানের হিসাব সংক্রান্ত বোঝা যায়।
Which of the follwoing is an example of a non -volatile computer memory?
Correct Answer:
B: ROM
Explanation:
Which of the follwoing is an example of a non -volatile computer memory? Correct Answer ROM Non - volatile শব্দের অর্থ অনুদ্বায়ী বা স্থায়ী। কম্পিউটার অনুদ্বায়ী বা স্থায়ী স্মৃতি হলো ROM। RAM হলো Volatile বা অস্থায়ী মেমোরি। তবে RAM ও ROM উভয়ই কম্পিউটারের মুখ্য মেমোরি।
A computer that stores and forwards e-mail message is called___
Correct Answer:
C: Mail server
Explanation:
A computer that stores and forwards e-mail message is called___ Correct Answer Mail server ইমেইল পাঠানোর জন্য যে কম্পিউটার স্টোর করা হয় এবং যে কম্পিউটার ঐ ইমেইল রিসিভ করে তাদের প্রত্যেকেই ক্লায়েন্ট কম্পিউটার। তবে এ পুরো প্রক্রিয়াটি (ইমেইল পাঠানো ও গ্রহণ) নিয়ন্ত্রিত হয় Mail server দ্বারা।
The main memory of a computer is also called-
Correct Answer:
D: All of these
Explanation:
The main memory of a computer is also called- Correct Answer All of these The destructor for the class Vehicle is - Vehicle () .
To reload a Web, which of the following button should be pressed in the web browser ?
Correct Answer:
C: Refresh
In Mainframe environment, the ___ terminal does not process data.
Correct Answer:
C: Dumb
Explanation:
In Mainframe environment, the ___ terminal does not process data. Correct Answer Dumb The time complexity of the Huffman algorithm is O(nlogn). Using a heap to store the weight of each tree, each iteration requires O(logn) time to determine the cheapest weight and insert the new weight. There are O(n) iterations, one for each item.
The energy stored in a body when stained within elastic limit is known as
Correct Answer:
D: strain energy
Explanation:
The energy stored in a body when stained within elastic limit is known as Correct Answer strain energy Strain energy: The energy stored in a body, when strained within the elastic limit is known as strain energy. The maximum strain energy which can be stored in a body is termed as proof resilience. The proof resilience per unit volume of a material is known as modulus of resilience.
One character is represented by-
Correct Answer:
B: One Byte
Explanation:
One character is represented by- Correct Answer One Byte প্রশ্নঃ one character is represented by.... বর্ননাঃ কম্পিউটার মেমোরিতে একটি ক্যারেক্টার এক বাইট যায়গা দখল করে। তাই উত্তর হবে one bite.
The _______clause is used to list the attributes desired in the result of a query.
Correct Answer:
B: select
Create table employee (name varcher, id integer)
Correct Answer:
B: DDL
In SQL_____, aggregate function can be used in the select list or the _____clause of a select statement of sub query. They cannot be used in a _____clause.
Correct Answer:
D: Group by, where
The data structure required to check whether an expression contains balanced parenthesis is?
Correct Answer:
A: Stack
Explanation:
The data structure required to check whether an expression contains balanced parenthesis is? Correct Answer Stack The data structure required to check whether an expression contains balanced parenthesis is a stack. This is a simple data structure in which elements can be added and removed in a specific order. In other words, it follows a LIFO or a FILO structure.