Sonali, Janata and RAKUB AE (IT)/ AHME/ AME Exam: 2020প্রশ্ন ও সমাধান
- Set by
- Sonali Bank
- Exam date
- 2020
- Questions
- 37 (37 MCQ, 0 written)
- Exam guide
- Government IT officer posts · সরকারি প্রতিষ্ঠানের আইটি পদ
- Networking · নেটওয়ার্কিং 9
- Cyber Security · সাইবার নিরাপত্তা 6
- Digital Logic · ডিজিটাল লজিক 4
- Computer Architecture · কম্পিউটার আর্কিটেকচার 3
- Data Structures · ডেটা স্ট্রাকচার 3
- Database · ডেটাবেজ 2
- General ICT · সাধারণ আইসিটি 2
- Programming · প্রোগ্রামিং 2
- Web Technology · ওয়েব টেকনোলজি 2
- Algorithms · অ্যালগরিদম 1
- Cloud & Emerging Tech · ক্লাউড ও উদীয়মান প্রযুক্তি 1
- Mathematics · গণিত 1
- Software Engineering · সফটওয়্যার ইঞ্জিনিয়ারিং 1
Which of the following memory devices is not reprogrammable?
- a)Flash memory
- b)ROM (correct answer)
- c)EPROM
- d)EEPROM
Answer and explanation
Correct answer: (b) ROM
A plain (mask-programmed) ROM has its data fixed during chip manufacture by the photomask used to make it. After the chip is made, the user cannot erase or rewrite it, so it is not reprogrammable.
Why the other options are wrong
- (a) Flash memory: a form of EEPROM that is erased electrically in blocks and rewritten in the circuit; it is reprogrammable (USB drives, SSDs, BIOS chips).
- (c) EPROM: erased by exposing the chip to ultraviolet light, then reprogrammed with a programmer.
- (d) EEPROM: erased and rewritten electrically, down to single bytes, without removing the chip.
Tip: Mask ROM: never; PROM: once; EPROM: UV erase; EEPROM: electrical, byte-wise; Flash: electrical, block-wise.
Sources: Classification of ROMs (UC Berkeley CS 150); Memories (AGH University of Krakow, lecture notes)
With zero volts on both inputs, what is the ideal output of an Operational Amplifier?
- a)Equal to Zero
- b)Same as positive input voltage
- c)None of the above
- d)Same as negative input voltage
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A technician testing a logic circuit sees that the output of a particular INVERTER is stuck LOW while its input is pulsing. Which one of the following is the possible reason for this faulty operation?
- a)The output of the INVERTER is internally grounded
- b)The output of the INVERTER is externally grounded
- c)The input being driven by output of the INVERTER is internally grounded
- d)All of the above
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Consider the activities A1, A2 and A3 related to email:
A1: Send an email from a mail client to a mail server
A2: Download an email from mailbox server to a mail client
A3: Checking email in a web browser
Which are the application-level protocols used in each activity?
- a)A1: HTTP A2: SMTP A3: POP
- b)A1: SMTP A2: FTP A3: HTTP
- c)A1: SMTP A2: POP A3: HTTP
- d)A1: POP A2: SMTP A3: IMAP
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Which of the following is the role of Certification Authority (CA) in electronic commerce using public key encryption?
- a)To manage a private key shared among the parties to the transaction.
- b)To manage digital signatures of the parties to the transaction
- c)To manage the passwords of the parties to the transaction
- d)To issue a digital certificate for the public key of the parties to the transaction
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The pre order traversal of binary tree is 40, 20, 10, 30, 60, 50, 70. Which one of the following is the post-order traversal of the tree?
- a)10,20,30,40,50,60,70
- b)10,30,20,50,70,60,40
- c)40,20,60,10,30,50,70
- d)70,50,60,30,10,20,40
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Suppose you are implementing a Queue of size N using a non-circular linked list having a front and a rear pointer as shown in the figure. The enqueue operation inserts a new node at the front and the dequeue operation deletes a node from the rear. Which one of the following is the time complexity of the most efficient implementation of the enqueue and dequeue operations, respectively on this data structure?
Diagram not available online: Singly linked list diagram with head and tail pointers
- a)Θ(1), Θ(1)
- b)Θ(1), Θ(n)
- c)Θ(n), Θ(1)
- d)Θ(n), Θ(n)
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Which device converts mechanical energy into electrical energy?
- a)Solar cell
- b)Motor
- c)Generator
- d)Transformer
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Which protocol dynamically assigns IP addresses in a TCP/IP network?
- a)ARP
- b)RIP
- c)SMTP
- d)DHCP
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A sine wave is offset ⅙ cycle with respect to time 0. What is its phase in degrees and radians?
- a)60° and 1.046 rad
- b)30° and 0.5236 rad
- c)90° and 2.046 rad
- d)360° and 6.2832 rad
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Which one is the bandwidth for a signal transmitting at 12 Mbps for QPSK (d=0)?
- a)2 MHz
- b)4 MHz
- c)6 MHz
- d)None of the above
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There is a RAM issue on a PC/laptop. Which of the following symptom(s) might be an indication of RAM issue?
- a)PC frequently freezes, reboots
- b)Wrong BIOS time
- c)Function keys are not working properly
- d)All of them
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The Bangladesh Bank robbery, also known as the Bangladesh bank cyber heist, was a theft that took place in February 2016. The governor of the central bank engaged ____ to lead the security incident response, vulnerability assessment and remediation.
- a)Fortinet Cyber Security
- b)Zacco Cybersecurity Research Lab
- c)Palo Alto Networks
- d)World Informatix Cyber Security
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The BNC connector is a miniature quick connect/disconnect connector that is used for ____ cable.
- a)Ribbon Electric
- b)Shielded/Twisted Pair
- c)Coaxial
- d)Fibre Optics
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____ is the technique of hiding secret data within an ordinary, non-secret, file or message in order to avoid detection; the secret data is then extracted at its destination.
- a)Cryptography Proper
- b)Steganography
- c)Overt Writing
- d)Coding
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A solid-state drive (SSD) is a newer, faster type of device that stores data on instantly-accessible ____.
- a)Ultra Magnetic Chip
- b)Integrated Circuit
- c)Random Access Memory
- d)High Bandwidth memory
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What is the current popular technology for maintaining smooth Wi-Fi performance and throughput for gaming, video streaming, and smart home devices?
- a)Wi-Fi Star Network Systems
- b)Wi-Fi Bus Network Systems
- c)Wi-Fi Mesh Network Systems
- d)Wi-Fi Ring Network Systems
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Which of the following techniques/algorithms cannot be used to detect cycles in an undirected and unweighted graph?
N.B: A cycle in a graph refers to a path where the starting and ending vertices are the same.
- a)Disjoint Set Data Structure
- b)Breadth First Search
- c)Depth First Search
- d)Floyd-Warshall algorithm
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USER150, USER153 can do certain tasks and USER151, USER152 can also do certain tasks as depicted in the picture. For this reason, two ____ have been created.
Diagram not available online: Diagram showing CREATE TABLE, SELECT ON Orders, and INSERT ON Orders privileges assigned via Account MGR and Inventory MGR roles to USER150-153
- a)Roles
- b)Privileges
- c)Functions
- d)Stord Procedures
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Handshaking procedure takes place in ____.
- a)TCP
- b)UDP
- c)ARP
- d)Both A and B
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What is the minimum value that can be stored accurately in a 32-bit signed integer of C programming language?
- a)0
- b)-2³¹
- c)-2³¹-1
- d)-2³²
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Suppose we have a Binary Search Tree where each node has an integer value. Which of the following tree traversal techniques can give us a sorted list (in ascending order) of those integers?
- a)Pre-order traversal
- b)In-order traversal
- c)Post-order traversal
- d)BFS traversal
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_____ is the final stage of the testing process conducted before software release. This is referred to as:
- a)Alpha testing
- b)Beta testing
- c)Gamma testing
- d)Delta testing
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Which of the following languages causes 'Indentation Errors' for not using tabs properly?
- a)JavaScript
- b)Python
- c)Java
- d)Ruby
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Using loopback plugs, which task can be done from the given list?
- a)measuring voltage
- b)Test serial and parallel ports
- c)Check series connectivity
- d)Check resistivity
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Which of the following is an attack that threatens the integrity of information?
- a)Falsification of web pages
- b)Illegal copy of data stored in system
- c)DoS attack that creates system overload
- d)Wiretapping of communication contents
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Which of the following is a package of unauthorized programs and tools that has functions to create a back door in a server and hide the trace of entry into the server?
- a)RFID
- b)Rootkit
- c)TKIP
- d)web beacon
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What is/are the main operation of SSL/TLS?
- a)Encrypt packet in Data Link Layer
- b)Check error in Network Layer
- c)Ensure data security in Transport Layer (correct answer)
- d)All of the above
Answer and explanation
Correct answer: (c) Ensure data security in Transport Layer
SSL and its successor TLS build a secure channel between two applications on top of a reliable transport such as TCP. They provide three things: authentication (the server always, the client optionally, using certificates), confidentiality (encryption) and integrity (tampering is detected). Because TLS secures the transport-level data stream for any application above it, such as HTTPS, SMTPS or IMAPS, its main job is described as data security at the transport layer, as its name says.
Why the other options are wrong
- (a) Encrypt packet in Data Link Layer: Layer 2 encryption is done by IEEE 802.1AE (MACsec) or Wi-Fi WPA2/WPA3; TLS never handles frames.
- (b) Check error in Network Layer: Error checking at Layer 3 is the IPv4 header checksum; TLS checks for deliberate tampering, not network transmission errors.
- (d) All of the above: Wrong because (a) and (b) are not functions of SSL/TLS.
Tip: TLS = Transport Layer Security = encryption + integrity + authentication above TCP.
Source: RFC 8446: The Transport Layer Security (TLS) Protocol Version 1.3
URL stands for-
- a)Universal Resource Locator
- b)Uniform Resource Locator (correct answer)
- c)Unique Resource Locator
- d)None
Answer and explanation
Correct answer: (b) Uniform Resource Locator
URL stands for Uniform Resource Locator. The IETF standards use exactly this name: RFC 1738 is titled "Uniform Resource Locators (URL)", and the current URI standard, RFC 3986, defines a URL as the subset of URIs (Uniform Resource Identifiers) that also tells you how to locate the resource, through its access mechanism. Example: https://www.example.com:443/docs/index.html?lang=en#top = scheme, host, port, path, query, fragment.
Why the other options are wrong
- (a) Universal Resource Locator: not the standard name. "Universal" appeared in the Web's early 1994 document on Universal Resource Identifiers (RFC 1630), but the standardised term for URL is Uniform.
- (c) Unique Resource Locator: never the expansion; many URLs can point to the same resource, so "unique" is not even accurate.
- (d) None: wrong, because (b) is the correct expansion.
Tip: URI = Uniform Resource Identifier; URL = Uniform Resource Locator (a URI that says where the resource is).
Sources: RFC 3986: Uniform Resource Identifier (URI): Generic Syntax, Section 1.1.3; RFC 1738: Uniform Resource Locators (URL)
How much data can a flip-flop store?
- a)4-bit data
- b)1-bit data (correct answer)
- c)3-bit data
- d)2-bit data
Answer and explanation
Correct answer: (b) 1-bit data
A flip-flop is a bistable circuit: it has exactly two stable states, used for 0 and 1, and it holds its state until a new input changes it. Two states carry log₂ 2 = 1 bit, so one flip-flop stores one bit. To store n bits you need n flip-flops (an n-bit register).
Why the other options are wrong
- (a) 4-bit data: 4 bits need 2⁴ = 16 states, i.e. 4 flip-flops (a 4-bit register).
- (c) 3-bit data: 3 bits need 2³ = 8 states, i.e. 3 flip-flops; one flip-flop has only 2 states.
- (d) 2-bit data: 2 bits need 2² = 4 states, i.e. 2 flip-flops.
Exam note: As printed, options (c) and (d) were identical ("3-bit data"). Option (d) is shown here as "2-bit data" so that the four options differ; the key (b) is not affected.
Tip: 1 flip-flop = 1 bit; n flip-flops = an n-bit register.
Which is the simplified form of (ABC)′ · (A′ + B′ + C′)?
- a)A′ + B′ + C′
- b)A′B′C′
- c)(ABC)′
- d)((ABC)′)′
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Which is not a type of DNS attack?
- a)Cache Poisoning Attack
- b)Denial of Service Attack
- c)DNS spoofing
- d)CSRF attack (correct answer)
Answer and explanation
Correct answer: (d) CSRF attack
Cross-Site Request Forgery (CSRF) is a web-application attack: a malicious page or link makes a victim's browser send a request to a site where the victim is already logged in, so the site performs an action the user never intended (changing an e-mail address, transferring money). It abuses the trust a web application places in an authenticated session and has nothing to do with the Domain Name System.
Why the other options are wrong
- (a) Cache Poisoning Attack: inserting forged records into a resolver's cache; RFC 3833 discusses name-based attacks "sometimes called 'cache poisoning' attacks" as a DNS-specific threat.
- (b) Denial of Service Attack: RFC 3833 states that DNS, like any network service, is vulnerable to denial of service, and DNS servers can also be abused to amplify floods.
- (c) DNS spoofing: sending a forged DNS response so the victim receives a false IP address; RFC 3833 covers forged responses and how DNSSEC detects them.
Tip: DNS attacks change or block name resolution; CSRF abuses a logged-in web session.
Source: RFC 3833: Threat Analysis of the Domain Name System (DNS); Cross Site Request Forgery (CSRF) | OWASP Foundation
Which is the disadvantage of Optical Fiber?
- a)Resistance to corrosive materials
- b)Greater immunity to tapping
- c)Unidirectional light propagation
- d)None of these
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Related records of the different relations can be stored on the same block using which file organization technique?
- a)Heap file organization
- b)Sequential file organization
- c)Hashing file organization
- d)Clustering file organization
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Which one is the text-based web browser?
- a)Chrome
- b)Lynx
- c)Safari
- d)Microsoft Edge
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Which one is not a layer of cloud computing?
- a)Computing as a service (CaaS)
- b)Infrastructure as a service (IaaS)
- c)Platform as a service (PaaS)
- d)Software as a service (SaaS)
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Which one of the following has higher bandwidth?
- a)Shielded Twisted Pair
- b)Unshielded Twisted Pair
- c)Coaxial Cables
- d)Fiber Optic Cables
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Question text is from the public recruitment exam; answers and explanations are written by ARBS Academy. All past papers · Government IT officer posts guide