Combined Bank Senior Officer (IT) Exam: 2018 (DU) | প্রশ্ন ও সমাধান

Question 1Programming

Which alternative can replace the throw statement in C++?

a)for
b)break
c)return
d)exit

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 2Programming

Which operator is used to declare the destructor in C++?

a)#
b)~
c)@
d)$

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 3Programming

What type of reference should be used in vector arithmetic in C++?

a)Dynamic
b)const
c)a and b
d)none of the mentioned

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 4Data Structures

Which of these data types is used by the operating system to manage the Recursion in Java?

a)Array
b)Stack
c)Queue
d)Tree

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 5Programming

Which of the following is an incorrect statement about packages?

a)Package defines a namespace in which classes are stored
b)A package can contain other packages within
c)A package can be renamed without renaming the directory in which the classes are stored
d)Java uses file system directories to store packages

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 6Programming

A derived class inherits attributes from a-

a)Super Class
b)Sub Class
c)Inner Class
d)Upper Class

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 7Programming

Multiple inheritance in Java can be implemented using which of the following?

a)Interfaces
b)Multithreading
c)Protected methods
d)Private methods

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 8Programming

Which component is used to compile, debug and execute a Java program?

a)JVM
b)JDK
c)JIT
d)JRE

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 9Mathematics

Which of the following statements is the negation of the statements "4 is odd or -9 is positive"?

a)4 is even or -9 is not negative
b)4 is odd or -9 is not negative
c)4 is even and -9 is negative
d)4 is odd and -9 is not negative

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 10Digital Logic

Which of the following options is suitable, if A is "10110110", B is "11100000" and C is "10100000"?

a)C=A or B
b)C=Ā
c)C=B̄
d)C=A and B

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 11Algorithms

The complexity of Binary search algorithm is-

a)O(n)
b)O(log n)
c)O(n²)
d)O(n log n)

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 12Web Technology

A nonstandard HTML extension that causes scrolling text to appear as part of a Web page is-

a)DHCP
b)mask off
c)Dhrystone
d)marquee

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 13Programming

The object being passed to a copy constructor:

a)Must be passed by reference
b)Must not be mentioned in parameter list
c)Must be passed with integer type
d)Must be passed by value

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 14Mathematics

If A= {1,2,3} and B= {1,2,5} then A-B=?

a){1}
b){5}
c){3}
d){2}

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 15Programming

Why do you need to handle exceptions?

a)To prevent abnormal termination of program (correct answer)
b)To encourage exception prone program
c)To avoid syntax errors
d)To save memory

Answer and explanation

Correct answer: (a) To prevent abnormal termination of program

An exception is a run-time event (division by zero, a missing file, an array index out of range) that disrupts the normal flow of a program. When it is thrown, the runtime searches back through the call stack for a handler. If none is found, the runtime system, and with it the program, terminates. Handling the exception (try/catch in Java and C++, try/except in Python) lets the program recover instead: show a message, retry, use a default value, release resources, and carry on or stop cleanly.

Why the other options are wrong

(b) To encourage exception prone program: The opposite of the goal; handling makes programs more robust, it does not encourage errors.
(c) To avoid syntax errors: Syntax errors are found by the compiler before the program runs, so there is no running program for a handler to protect.
(d) To save memory: Exception handling is about controlling errors, not memory; it actually adds a little code.

Tip: Unhandled exception = crash; handled exception = graceful recovery.

Source: What Is an Exception? (The Java Tutorials) - Oracle

Question 16Programming

If the same message is passed to objects of several different classes and all of those can respond in a different way, what is this feature called?

a)Inheritance
b)Overloading
c)Polymorphism
d)Overriding

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 17Programming

Does constructor overloading include different return types for constructors to be overloaded?

a)Yes, if return types are different, signature becomes different
b)Yes, because return types can differentiate two functions
c)No, return type can't differentiate two functions
d)No, constructors don't have any return type

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 18Digital Logic

(2019)₁₀ in Binary is________.

a)0000011111100010
b)0000001111110011
c)0000001111110010
d)0000011111100011 (correct answer)

Answer and explanation

Correct answer: (d) 0000011111100011

Divide by 2 repeatedly and read the remainders from bottom to top:

2019 ÷ 2 = 1009 r 1; 1009 ÷ 2 = 504 r 1; 504 ÷ 2 = 252 r 0; 252 ÷ 2 = 126 r 0
126 ÷ 2 = 63 r 0; 63 ÷ 2 = 31 r 1; 31 ÷ 2 = 15 r 1; 15 ÷ 2 = 7 r 1
7 ÷ 2 = 3 r 1; 3 ÷ 2 = 1 r 1; 1 ÷ 2 = 0 r 1

Bottom to top: 11111100011 (11 bits). Padded to 16 bits: 0000 0111 1110 0011.

Check: 1024 + 512 + 256 + 128 + 64 + 32 + 2 + 1 = 2019 ✓ (in hex, 07E3).

Why the other options are wrong

(a) 0000011111100010: = 2018; it ends in 0, but 2019 is odd, so its last bit must be 1.
(b) 0000001111110011: = 1011; compared with 2019 = 11111100011₂ it has one 0 missing in the middle (1111110011₂).
(c) 0000001111110010: = 1010, and it is even, so it cannot be 2019.

Tip: An odd number always ends in 1 in binary, which rules out (a) and (c) at once.

Question 19Programming

An array contains the following letters, Color = {E, L, E, C, T, I, O, N}. The value of the variable E = 3. Color[E] points to which value?

a)E
b)C
c)T
d)I

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 20Programming

How to access the overridden method of base class from the derived class?

a)Using arrow operator
b)Using dot operator
c)Using scope resolution operator
d)Can't be accessed once overridden

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 21Digital Logic

When two variables are logically compared, the logic gate that tests the equivalence is-

a)XNOR
b)XOR
c)AND
d)NOR

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 22Cyber Security

Which of the following is not a malware?

a)Virus
b)Worm
c)Bug
d)Trojan horse

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 23Digital Logic

(11100010)₂ has a decimal value of________.

a)252
b)225
c)226
d)220

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 24General ICT

Dark data represents________

a)Unused data
b)Harmful data
c)Highlighted data
d)Important data

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 25Programming

Source code is a(an)________

a)Program
b)List of commands
c)Source of variables
d)Algorithm

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 26Networking

Which of the following defines the addressing capabilities of networking?

a)OSI
b)NAT
c)TCP
d)UDP

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 27Networking

How many layers are there in the software part of networking framework?

a)Three
b)Seven
c)Four
d)Five

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 28Cloud & Emerging Tech

AR refers to which of the following environment—

a)Artificial Reality
b)Augmented Report
c)Artificial Report
d)Augmented Reality

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 29General ICT

Which of the following is the smallest size in the list?

a)Zettabyte
b)Gigabyte
c)Petabyte
d)Terabyte

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 30Database

A primary key must also be-

a)Foreign key
b)Unique (correct answer)
c)Identical
d)Case sensitive

Answer and explanation

Correct answer: (b) Unique

A primary key identifies each row of a table, so its value must be unique (no two rows share it) and NOT NULL (never missing). If two rows could share a key value, the key would no longer tell them apart. A table has at most one primary key.

CREATE TABLE pk (a TEXT NOT NULL PRIMARY KEY, b TEXT);
INSERT INTO pk VALUES ('R1', 'x');   -- OK
INSERT INTO pk VALUES ('R1', 'x');   -- UNIQUE constraint failed

Why the other options are wrong

(a) Foreign key: A primary key does not have to refer to another table. It can also be a foreign key in some designs (for example a one-to-one extension table), but that is not required.
(c) Identical: The opposite of the requirement; identical key values would make rows indistinguishable.
(d) Case sensitive: Case sensitivity depends on the data type and collation (numeric keys have no case at all); it is not a property every key must have.

Tip: Primary key = UNIQUE + NOT NULL, one per table.

Sources: PostgreSQL Documentation: 5.5. Constraints; Oracle Database Concepts 19c: Data Integrity

Question 31Operating Systems

Memory management scheme by which a computer stores and retrieves data from secondary storage for use in main memory is-

a)Paging
b)Scheduling
c)Batch processing
d)Virtual storage

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 32Computer Architecture

A single communication system that transfers and connects the data between major components inside a computer is-

a)Address Bus
b)Data Bus
c)System Bus
d)Control Bus

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 33General ICT

USB stands for-

a)Universal Serial Bus (correct answer)
b)Universal Series Bus
c)Universal Serial Bits
d)Universal Series Bits

Answer and explanation

Correct answer: (a) Universal Serial Bus

USB stands for Universal Serial Bus. It is a standard plug-and-play serial interface that gives a low-cost, uniform way to connect peripherals such as keyboards, mice, printers, scanners, cameras and storage devices to a computer, and it can also supply power. "Serial" means data travels one bit after another over the data lines, and "bus" means a shared connection path that many devices can use. The specification is maintained by the USB Implementers Forum (USB-IF).

Why the other options are wrong

(b) Universal Series Bus: "Series" is wrong; the name refers to serial (bit-by-bit) transfer.
(c) Universal Serial Bits: "Bits" is wrong; the B stands for Bus, the shared connection path.
(d) Universal Series Bits: wrong on both words.

Tip: USB = Universal Serial Bus.

Source: Universal Serial Bus (USB) - Windows drivers | Microsoft Learn

Question 34Programming

int C=10; System.out.println(C--); gives an output of-

a)10
b)11
c)9
d)8

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 35General ICT

All of the following are considered game engines except-

a)Hex Editor
b)Unity
c)HTML 5
d)Adobe Flash

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 36Database

Which of the following logical connectives is not included in SQL?

a)AND
b)OR
c)NOR
d)NOT

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন

Question 37Networking

The full form of "Wi-Fi" is-

a)Wireless Internet
b)Wireless Fidelity (correct answer)
c)Wireless Field
d)Wireless Fiction

Answer and explanation

Correct answer: (b) Wireless Fidelity

In exams, "Wi-Fi" is expanded as Wireless Fidelity, and that is the expected answer here. Strictly speaking, Wi-Fi is a brand name rather than a true acronym: the branding firm Interbrand coined it for the group now called the Wi-Fi Alliance, which adopted "Wi-Fi" as the name for its work in 2000. The name was meant to echo "Hi-Fi", and a short-lived Alliance slogan, "The Standard for Wireless Fidelity", is where the popular expansion comes from. The technology behind the name is wireless LAN based on the IEEE 802.11 family of standards.

Why the other options are wrong

(a) Wireless Internet: Wi-Fi is a local-area technology that can carry Internet traffic, but "Wireless Internet" has never been given as the meaning of the name.
(c) Wireless Field: This expansion is not used by any standards body, vendor or the Wi-Fi Alliance.
(d) Wireless Fiction: A made-up distractor with no connection to the term.

Tip: For exams, Wi-Fi = Wireless Fidelity; technically it is the Wi-Fi Alliance's brand name for IEEE 802.11 WLAN products.

Source: What Is a Wireless Router? - Cisco; Wi-Fi Alliance: History; Wi-Fi - Wikipedia

Question 38Database

What represents a row in a relational database?

a)variable
b)tuple
c)entity
d)field

Sign up free to see the answer and explanation · উত্তর দেখতে বিনামূল্যে সাইন আপ করুন