Sonali Bank Ltd. Assistant Database Administrator Exam: 2020 | প্রশ্ন ও সমাধান

Question 1Database

Which is not a step of SQL query processing?

a)Parsing
b)Translation
c)Optimization
d)None

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Question 2Database

Find the output:

int a= 10, c, b;
c = (a=99)? b = 11:20;
printf("%d, %d", a, c);

a)11, 99
b)99, 11
c)20, 11
d)99, 20

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Question 3Programming

What will be the output of following code?

int x=5, y=5, z=5;
printf("%d", ++z+y-1-y+z+x++);

a)15
b)17
c)16
d)19

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Question 4Operating Systems

A computer system has 6 tape drives and each process may need 3 tape drives. What is the maximum number of processes that is guaranteed to be deadlock free?

a)4
b)3
c)2
d)None

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Question 5Database

Consider the following table named "Course"-

Course Title	Content
Web Programming	Python, CSS, JS

What is the main problem/anomaly in the Course table?

a)Attribute name is not correct
b)Table is larger
c)Attribute has multiple values
d)It has functional dependency

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Question 6Microprocessor

Which is the immediate addressing mode in an 8086 microprocessor?

a)MOV AX, BX
b)MOV AX, [BX]
c)MOV AX, 1000 (correct answer)
d)MOV AX, [BX+1000]

Answer and explanation

Correct answer: (c) MOV AX, 1000

In immediate addressing the operand is a constant stored inside the instruction itself, so the CPU needs no register or memory access to get it. In MOV AX, 1000 the source is the number 1000. It is encoded right after the opcode (Intel's "immediate to register" form of MOV) and copied into AX. In MASM-style syntax 1000 is decimal (03E8h), and 1000h would be hexadecimal; either way the mode is immediate.

Why the other options are wrong

(a) MOV AX, BX: register addressing, because both operands are registers.
(b) MOV AX, [BX]: register indirect addressing. BX holds the offset of the memory operand in the data segment.
(d) MOV AX, [BX+1000]: based (register-relative) addressing. The effective address = BX + displacement 1000, and the operand is in memory.

Tip: A plain number as the source operand means immediate; square brackets mean the operand is in memory.

Source: Intel 8086 16-Bit HMOS Microprocessor data sheet (order no. 231455-005), copy hosted by KFUPM

Question 7Database

Consider the following relation-

employee

ID
name
- first_name
- last_name
address
- city
- zip
birth_date
age()

Which are the composite attributes in the "employee" relation?

a)age, ID
b)birth_date
c)name, address
d)name, age

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Question 8Programming

Which information is not correct for any constructor of a Java class?

a)Constructor is not inherited
b)Constructor has no return type
c)Constructor can be final
d)Constructor can be overloaded

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Question 9Programming

What will be the output of the given line?

printf("%d", sizeof(int));

a)2
b)4
c)1
d)8

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Question 10Database

The collection of information stored in the database at a particular moment is called-

a)Schema
b)Instance
c)Relation
d)Record

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Question 11Database

In a table an attribute named interest is defined as follows,

interest numeric (2,1)

Then which one is the correct format for the interest column?

a)65.2
b)7.2
c)19.02
d)1.03

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Question 12Operating Systems

What is the disadvantage of multithreading?

a)Share the same address space
b)Simultaneous access to multiple applications
c)Low cost communication
d)Difficulty in managing concurrency (correct answer)

Answer and explanation

Correct answer: (d) Difficulty in managing concurrency

Threads of one process run concurrently over the same memory, so a shared variable can be read and written by several threads at once. Without careful synchronisation (locks, mutexes, atomic operations) the program suffers race conditions, where the result depends on which thread gets there first, and deadlocks, where threads wait for each other's locks forever. Such bugs depend on timing, so they are hard to reproduce and debug. That is the main price paid for multithreading.

Why the other options are wrong

(a) Share the same address space: sharing memory is a key benefit of threads: data is shared without copying and without setting up IPC.
(b) Simultaneous access to multiple applications: doing several activities at the same time (responsiveness, parallelism on multicore CPUs) is the purpose of multithreading, an advantage.
(c) Low cost communication: threads communicate through shared memory, far cheaper than inter-process communication; an advantage.

Exam note: Option (b) is repaired from "multiple application" to "multiple applications" (grammar only).

Tip: Threads buy speed and cheap sharing; the price is synchronisation complexity.

Source: Managed threading best practices — Microsoft Learn

Question 13Database

Which one is a Data Control Language (DCL) command in SQL?

a)Insert
b)Create
c)Drop
d)Grant

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Question 14Operating Systems

The time needed from the process arrival to the completion of that process is called

a)Waiting time
b)Response time
c)Turnaround time
d)Throughput

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Question 15Database

A relationship is given below in an ER diagram How many tables can be created (preferred) from below diagram?

Diagram not available online: ER diagram showing instructor and student entities connected by an advisor relationship

a)No definite numbers
b)Two
c)Three
d)Two or Three

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Question 16Database

We can create a "View" of a relation using the "create view_name" command in SQL. Analyze the following information about views and find which option is correct-

a)View is not visible to user
b)It is not a virtual table
c)It is not a part of the logical model
d)View cannot be updated

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Question 17Networking

Which information is wrong for a switch?

a)Stores MAC address table
b)Operates at Data Link Layer
c)Forwards the packet to the intended computer
d)Has no memory (correct answer)

Answer and explanation

Correct answer: (d) Has no memory

The question asks which statement is WRONG about a switch. A switch certainly has memory: it learns which MAC address sits behind which port and keeps that list in its MAC address table, held in CAM (content-addressable memory). Ports also buffer frames in memory before forwarding them. So "has no memory" is false.

Why the other options are wrong (they are true statements)

(a) Stores MAC address table: True; the switch builds this table by reading the source MAC address of every incoming frame.
(b) Operates at Data Link Layer: True; a basic switch is a Layer 2 device.
(c) Forwards the packet to the intended computer: True; it sends a frame only out of the port linked to the destination MAC address. (Strictly, at Layer 2 the unit is a frame, not a packet.)

Tip: Hub = no table, repeats everything; switch = MAC table in memory, forwards selectively.

Source: Troubleshoot LAN Switching Environments - Cisco

Question 18Data Structures

What is the postfix expression of the string a+(b-c)*d?

a)abc-d*+
b)abcd-*+
c)ad*bc-
d)abc-d+*

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Question 19Operating Systems

Which is not the state of a process in an Operating System?

a)New
b)Sleep
c)Terminated
d)Ready

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Question 20Data Structures

If we represent a binary tree using array, what will be the children of node "n"-

a)2n & 2n+1
b)2n & 2-n
c)(n+1)2
d)2n & 2n-1

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Question 21Programming

Find the correct output:

int a=10, b=20;
a^=b; b^=a; a^=b;
printf("%d%d",a,b);

a)20 30
b)10 30
c)20 10
d)Garbage Value

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Question 22Database

Consider the following "staff" table

staff_name	staff_dep	city
Riaz	CSE	Dhaka
Toha	EEE	Rajshahi

What should be the query to find the output like "Riaz(CSE)" from the staff table?

a)select staff_name || '('|| staff_dep ||')' FROM staff where city= 'Dhaka'
b)select staff_name '('|| staff_dep ||')' FROM staff where city== 'Dhaka'
c)select staff_name || '('|| staff_dep ')'|| FROM staff where city= 'Dhaka'
d)select staff_name || '(' staff_dep ||')' FROM staff where city= 'Rajshahi'

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Question 23Digital Logic

Among the following, which is not a divisor of (1001011011110000000)₂?

a)(2)₁₀
b)(64)₁₀
c)(128)₁₀
d)(256)₁₀ (correct answer)

Answer and explanation

Correct answer: (d) (256)₁₀

In binary, each trailing 0 is one factor of 2. The number 1001011011110000000₂ ends in exactly 7 zeros (…1111 0000000), and the bit before them is 1. So it equals 2⁷ × (an odd number):

1001011011110000000₂ = 309120 = 2⁷ × 2415, and 2415 is odd.

It is therefore divisible by 2¹ up to 2⁷ = 128, but not by 2⁸ = 256: 309120 ÷ 256 = 1207.5.

Why the other options are wrong

(a) (2)₁₀: 2 = 2¹ needs one trailing zero; there are 7. 309120 ÷ 2 = 154560.
(b) (64)₁₀: 64 = 2⁶ needs six trailing zeros; there are 7. 309120 ÷ 64 = 4830.
(c) (128)₁₀: 128 = 2⁷ needs seven trailing zeros; there are exactly 7. 309120 ÷ 128 = 2415.

Tip: k trailing zeros in binary → divisible by 2ᵏ, but not by 2ᵏ⁺¹ when the next bit is 1.

Question 24Networking

The ____ was the first wide-area packet-switching network with distributed control and one of the first networks to implement the TCP/IP protocol suite.

a)INTRANET
b)UCLA
c)CREN
d)ARPANET

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Question 25Programming

What is the output of this Java program?

class Test {
    int i;
}
public class Main{
    public static void main(String args[]){
        Test t=new Test();
        System.out.println(t.i);
    }
}

a)The program will cause a compile error because the object "t" was not initialized
b)The program will cause a runtime exception because the variable "i" was not initialized
c)A garbage value
d)0

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Question 26Operating Systems

Which language was used to build Android Operating System?

a)Java
b)Python
c)Kotlin
d)Android is not an operating system

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Question 27Algorithms

In the following graph, determine the cost of the shortest path between node 1 and node 4

Diagram not available online: Graph with nodes 1, 2, 3, 4 and weighted edges 2, 3, -7, 1

a)0
b)4
c)-5
d)-∞

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Question 28Programming

Suppose Y is an integer variable whose value is either 0 or 1. Which of the following is the equivalent of the statement: if(Y==0)Y=1; else Y=0;?

a)Y=1+Y
b)Y=1-Y
c)Y=Y-1
d)Y=1%Y

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Question 29Data Structures

Which one is the characteristic of Stack ADT?

a)Sequential Index
b)Last-In-First-Out (correct answer)
c)First-In-First Out
d)Key indexing

Answer and explanation

Correct answer: (b) Last-In-First-Out

The Stack ADT is defined by its access rule: only the most recently added item can be removed. Push and pop both work at the top, so the last item in is the first item out (LIFO).

Why the other options are wrong

(a) Sequential Index: Access by position or index belongs to an array or list. A stack exposes only its top.
(c) First-In-First-Out: That is the queue rule (FIFO), where the earliest added item leaves first.
(d) Key indexing: Looking items up by key belongs to a dictionary, map or hash table, not a stack.

Tip: ADT, then its rule: Stack = LIFO, Queue = FIFO, Map = key lookup, Array = index access.

Source: stack — Dictionary of Algorithms and Data Structures (NIST)
Source: queue — Dictionary of Algorithms and Data Structures (NIST)

Question 30Database

If you are told to remove the inconsistency from the course table, which normalization technique will you use?

a)1NF
b)2NF
c)3NF
d)BCNF

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Question 31Database

What is the maximum length of the "varchar" in the database?

a)35000
b)100
c)65535
d)255

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Question 32Programming

Which for loop statement is invalid?

a)for(int x=10; k<=5; x/9) (correct answer)
b)for(int x=10; x>=2; --x)
c)for(int x=10; x>=200; x=3*x)
d)for(int x=10; x>=0; x+=2)

Answer and explanation

Correct answer: (a) for(int x=10; k<=5; x/9)

A for header has three parts: for (init; condition; update). Check (a) part by part:

int x=10 declares the loop variable x.
The condition k<=5 uses k, which is never declared, so the compiler stops. gcc reports 'k' undeclared (first use in this function).
Even if some k existed, the update x/9 only computes a value and throws it away (gcc warns "statement with no effect"), so x never changes. A working update would be x/=9 or x=x/9.

Why the other options are wrong

(b) for(int x=10; x>=2; --x): Valid. x takes the values 10, 9, …, 2, so the body runs 9 times.
(c) for(int x=10; x>=200; x=3*x): Valid syntax. The test 10 ≥ 200 is false at the start, so the body runs 0 times. A loop that never runs is still a legal loop.
(d) for(int x=10; x>=0; x+=2): Valid syntax. x only grows (10, 12, 14, …), so the condition stays true and the loop runs indefinitely unless the body uses break. Endless is not the same as invalid.

Tip: "Invalid" means it will not compile: look first for an undeclared name or a malformed header, then check that the update really changes the loop variable.

Declaring int x inside the for header needs C99 or later (or C++).

Source: for loop - cppreference.com

Question 33Networking

How many IP addresses can be assigned using IPv4 techniques?

a)2^32
b)2^64
c)4^32
d)4^64

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Question 34Data Structures

In which tree structure left and right subtree heights differ by not more than 1?

a)Binary tree
b)BST
c)AVL tree
d)Binary Heap

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Question 35Database

Assume that in a table named "student" the cgpa is calculated using the GPAs of all courses. What kind of attribute is cgpa?

a)Multivalued
b)Derived
c)Simple
d)Composite

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Question 36Web Technology

Which is the lightweight message format?

a)XML
b)JSON (correct answer)
c)SQL
d)HTML

Answer and explanation

Correct answer: (b) JSON

JSON (JavaScript Object Notation) is the standard lightweight, text-based, language-independent format for exchanging data. A message is just objects ({"name": "Rahim", "age": 25}), arrays, strings, numbers, true/false and null, so it carries very little overhead and almost every language can parse it. That is why REST APIs and AJAX calls normally send JSON.

Why the other options are wrong

(a) XML: also used for data exchange, but every value sits between a start tag and an end tag, which makes messages larger and parsing heavier.
(c) SQL: a query language for relational databases, not a message format.
(d) HTML: a markup language for structuring web pages, not for exchanging data between programs.

Tip: Lightweight data exchange = JSON; XML is the heavier alternative.

Source: RFC 8259: The JavaScript Object Notation (JSON) Data Interchange Format

Question 37Database

Which is the wrong statement about SQL?

a)Non-procedural language
b)Input can be several tables
c)Output is always a single table
d)Output can be multiple tables

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Question 38Database

The ____ operation, denoted by −, allows us to find tuples that are in one relation but are not in another.

a)Union
b)Set-difference
c)Difference
d)Intersection

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Question 39Database

Why is RAID used in database storage?

a)Improve performance
b)Reduce Cost
c)Both a & b (correct answer)
d)None

Answer and explanation

Correct answer: (c) Both a & b

RAID (Redundant Array of Inexpensive Disks, today usually read as Independent Disks) combines several physical disks into one logical unit. The Berkeley proposal that introduced it argued that an array of small, cheap PC-class disks could replace one Single Large Expensive Disk (SLED) and give:

higher performance: data is striped across many disks, which work in parallel for more bandwidth and more I/O operations per second;
lower cost: for example, 75 inexpensive disks compared with one large IBM 3380 drive offered several times the I/O bandwidth at a lower price;
and, through redundancy (mirroring or parity), reliability that offsets the higher failure rate of having many disks.

So improved performance and reduced cost both describe why RAID was adopted.

Why the other options are wrong

(a) Improve performance: True, but only half the answer; option (c) includes it.
(b) Reduce Cost: True of the original motivation, but also incomplete.
(d) None: Both goals do apply, so this cannot be right.

Tip: RAID: striping → speed; mirroring/parity → reliability; many cheap disks → lower cost.

Sources: A Case for Redundant Arrays of Inexpensive Disks (RAID) - UC Berkeley EECS Technical Report UCB/CSD-87-391; RAID - Duke University ECE 590 Enterprise Storage Architecture lecture slides

Exam note: Modern RAID is chosen mainly for reliability (fault tolerance) and performance, and redundant levels such as RAID 1 need extra disks, so "reduce cost" rests on the original "inexpensive disks" motivation. The paper as printed expects both. If the question reappears unchanged, choose (c).

Question 40Database

Which is not a step of SQL query processing?

a)Parsing
b)Translation
c)Optimization
d)None

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Question 41English

They while their evenings with books and games. Here while is-

a)Noun
b)Verb
c)Adjective
d)Adverb

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Question 42English

His evidence bears out, the evidence of the first witness. Here bears out means

a)confirms
b)wcount
c)attacks
d)none

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Question 43English

The person with ____ you should ____ registering your complaint is the manager but he's unavailable ____ the moment.

a)which, be, for
b)who, at, for
c)which, who,
d)whom, be, at

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Question 44English

If you had come earlier, you would ____ found a good seat

a)have
b)had
c)can
d)has

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Question 45English

People who pay their debts are trusted. Here who pay their debts is

a)Phrase
b)Clause
c)Idioms
d)Gerund

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Question 46English

A misconception frequently held by novice writers is that sentence structure mirrors thought: the more convoluted the structure, the more ____ the ideas

a)complicated
b)engaged
c)essential
d)fanciful

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Question 47English

I've got a week to finish this, ____ is just about long enough

a)what
b)which
c)whether
d)who

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Question 48English

He really can't work out, ____ he has to go to get ____ information he needs

a)what, the
b)which, to
c)what, to
d)for, which

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Question 49English

Reading is very good ____ children's intellectual development

a)at
b)on
c)for
d)in

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Question 50English

The quote "All the glitters is not gold" is from which play of Shakespeare?

a)The Merchant of Venice
b)Othello
c)Romeo and Juliet
d)None

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Question 51General Knowledge

How many countries are members of Commonwealth?

a)47
b)51
c)54
d)61

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Question 52General Knowledge

The total border district of Bangladesh?

a)29
b)32
c)45
d)53

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Question 53General Knowledge

What is the position of Bangladesh in the financial Privacy Index 2020?

a)29th
b)37th
c)43th
d)54th

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Question 54General Knowledge

The river Padma enters into Bangladesh through-

a)Sylhet
b)Rajshahi
c)Mymensingh
d)Pabna

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Question 55General Knowledge

The headquarter of World Economic Forum is situated in-

a)Cologny
b)Geneva
c)Davos
d)San Francisco

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Question 56General Knowledge

The term of a non-permanent member of the UN security council is-

a)2 years
b)3 years
c)5 years
d)7 years

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Question 57General Knowledge

The Constitution Drafting Committee of Bangladesh formed in 1972 had-

a)21 members
b)24 members
c)31 members
d)34 members

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Question 58General Knowledge

Which bank was the first to Introduce dual-currency debit card system in Bangladesh?

a)Mutual Trust Bank
b)City Bank
c)Dutch Bangla Bank
d)AB Bank

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Question 59General Knowledge

Which one of the following is not an official language of United Nations?

a)Arabic
b)Chinese
c)Portuguese
d)Spanish

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Question 60General Knowledge

The number of tribes lives in the Chattogram Hill Tracts is-

a)7
b)9
c)11
d)15

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Question 61Bangla

অবাক হয়ে ওর দিকে তাকিয়ে থাকে ওরা। এখানে 'দিকে' শব্দটি-

a)অনুসর্গ
b)বিশ্লেষণ
c)অব্যয়
d)উপসর্গ

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Question 62Bangla

'চশমা' শব্দটি কোন ভাষা থেকে এসেছে?

a)আরবি
b)ফারসি
c)তুর্কি
d)পর্তুগীজ

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Question 63Bangla

বৃক্ষ শব্দের সমার্থক নয় কোনটি?

a)তরু
b)বিটপী
c)কানন
d)মহীরুহ

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Question 64Bangla

'আমি কি ডরাই সখি ভিখারি রাঘবে?' কোন কারকে কোন বিভক্তি?

a)কর্মে প্রথমা
b)অপাদানে সপ্তমী
c)অধিকরণে পঞ্চমী
d)কর্মে সপ্তমী

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Question 65Bangla

নিচের কোনটি দেশী শব্দ?

a)ডাব
b)ধর্ম
c)তোশক
d)হাত

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Question 66Bangla

দুটি ব্যঞ্জনের পরস্পর পরিবর্তন কে বলে-

a)স্বরসঙ্গতি
b)বিষমীভবন
c)ধ্বনি বিপর্যয়
d)ব্যঞ্জনবিকৃতি

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Question 67Bangla

ব্রাহ্মণশব্দে 'হ্ম'-এর বিশ্লেষিত রূপ-

a)হ+ম
b)ক+ধ
c)ক+ষ+ম
d)ক+ষ+ণ

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Question 68Bangla

'কাজটি শেষ করার জন্য সে আদা-কাচকলা খেয়ে নেমেছে।' বাক্যটি কী হারিয়েছে?

a)আকাঙ্ক্ষা
b)আসক্তি
c)যোগ্যতা
d)পদক্রম

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Question 69Bangla

ভাষা আন্দোলনের পটভূমিতে কবর নাটকটি রচনা করেন-

a)কবীর চৌধুরী
b)সৈয়দ শামসুল হক
c)সেলিম আল দীন
d)মুনীর চৌধুরী

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Question 70Bangla

নিচের কোনটি সাধু রীতির বৈশিষ্ট্য নয়?

a)তৎসম শব্দবহুল
b)তদ্ভব শব্দবহুল
c)সংলাপের অনুপযোগী
d)শব্দবিন্যাস সুনির্দিষ্ট

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