Combined Bank Senior Officer October 2021 – Preliminary question & solution

Questions from the Combined Bank Senior Officer recruitment exam, October 2021 – Preliminary, shared by the candidates who sat it. The paper: 98 MCQs. So far 97 MCQs and 11 written questions have been shared. Topics include Computer Networks, DBMS, Bangla, General Knowledge and Computer Architecture.

MCQ (97)

  1. A system has 12 magnetic tape drives and 3 processes: P0, P1, and P2. Process P0 requires 10 tape drives, P1 requires 4 and P2 requires 9…
    1. a) P0, P1, P2
    2. b) P1, P2, P0
    3. c) P2, P0, P1
    4. d) P1, P0, P2
  2. What is the network address for the IP address 178.112.13.10/8?
    1. a) 178.0.0.0
    2. b) 178.112.0.0
    3. c) 255.0.0.0
    4. d) 255.255.0.0
  3. Which RAID level creates a mirror of all disks for storing data?
    1. a) RAID Level 0
    2. b) RAID Level 1
    3. c) RAID Level 2
    4. d) RAID Level 3
  4. NIC stands for–
    1. a) Network Interface Card
    2. b) Network Interface Circuit
    3. c) Network Internal Card
    4. d) Network Input Card
  5. In the priority queue, insertion and deletion take place at –
    1. a) Front and rear end
    2. b) Only at the front end
    3. c) Only at the rear end
    4. d) Any position
  6. In Unix operating system, which system call is used for creating a new process?
    1. a) Exec()
    2. b) Create Process()
    3. c) Fork()
    4. d) None of them
  7. Which type of JOIN operation in SQL command is used to return rows that do not have matching values?
    1. a) Natural Join
    2. b) EQUI Join
    3. c) Outer Join
    4. d) All of the above
  8. Consider a magnetic disk packed with 32 surfaces. Each surface is divided into 128 tracks with 256 sectors per track. If the size of a…
    1. a) 2³⁰ bytes
    2. b) 2³³ bytes
    3. c) 2²⁷ bytes
    4. d) 2²⁰ bytes
  9. Which is the correct definition of BUG?
    1. a) A difficult syntax error in a program
    2. b) A logical error in a program
    3. c) Documenting programs
    4. d) All of the above
  10. How can you clear the CMOS password?
    1. a) Changing motherboard's jumper setting
    2. b) Formatting the system
    3. c) Removing BIOS battery
    4. d) None of the above
  11. What is the best way to protect your hard drive data?
    1. a) Regular Backup
    2. b) Run a regular diagnosis
    3. c) Periodically defrag it
    4. d) Run scandisk at least once a week
  12. Which feature is not applicable for memory-mapped I/O?
    1. a) Device registers can be accessed with any instructions
    2. b) System memory address space is used up for ports
    3. c) New instructions are required to access the device registers
    4. d) Arithmetic and logical operations can be performed directly on data
  13. Which of the following is a device that is used to connect a number of LANs?
    1. a) Bridge
    2. b) Switch
    3. c) Router
    4. d) Repeater
  14. Which of the following causes the average memory access time to increase in a memory system with cache memory?
    1. a) Reduction of access time to cache memory
    2. b) Decrease in hit ratio
    3. c) Reduction of miss penalty
    4. d) Decrease in miss ratio
  15. Which searching algorithm can take O(1) time to find a data from a list?
    1. a) Tree search
    2. b) Linear Search
    3. c) Binary Search
    4. d) Hashing
  16. Which of the following techniques uses memoization?
    1. a) Greedy algorithms
    2. b) Dynamic Programming
    3. c) Divide and Conquer approach
    4. d) None of them
  17. Consider a virtual memory system with FIFO page replacement policy. For an arbitrary page access pattern, increasing the number of page…
    1. a) Always decrease the number of page faults
    2. b) Always increase the number of page faults
    3. c) Sometimes increase the number of page faults
    4. d) Never affect the number of page faults
  18. In binary search, what is the average number of comparisons required to search an element in a list if the number of elements is n-
    1. a) 2/n
    2. b) n
    3. c) log₂n
    4. d) n − 1
  19. Mapping of a known IP address to a MAC layer address is done by which of the following protocols?
    1. a) Dynamic Host Control Protocol (DHCP)
    2. b) Open Shortest Path First (OSPF) Protocol
    3. c) Address Resolution Protocol (ARP)
    4. d) Network Address Translation (NAT)
  20. Applying LRU page replacement to the reference string 1 2 4 5 2 1 2 4, the main memory can accommodate 3 pages and it already holds pages…
    1. a) 3
    2. b) 4
    3. c) 5
    4. d) 6
  21. A student breaks the door of a professor's office to obtain a copy of the next day's examination. Define the type of security attack in…
    1. a) Snooping
    2. b) Repudiation
    3. c) Masquerading
    4. d) Replaying
  22. Which of the following registers is loaded with the contents of the memory location pointed to by the PC?
    1. a) Memory address register
    2. b) Instruction register
    3. c) Memory data stores
    4. d) Program counter
  23. Which of the following commands is a type of Data Definition Language command?
    1. a) Create
    2. b) Update
    3. c) Delete
    4. d) Select
  24. Let transaction T1 have obtained a shared mode lock S on data item Q and transaction T2 has obtained an exclusive mode lock X on data item…
    1. a) Only I
    2. b) Only II
    3. c) Both I and II
    4. d) Neither I nor II
  25. The address bus flows in——
    1. a) Unidirectional
    2. b) Bidirectional
    3. c) Multidirectional
    4. d) Circular
  26. A proxy server is used as the computer–
    1. a) With external access
    2. b) Acting as a backup
    3. c) Performing file handling
    4. d) Accessing user permissions
  27. Which would you do first when troubleshooting a faulty monitor?
    1. a) Check its connections to the computer and power source
    2. b) Use a meter to check the CRT and internal circuitry for continuity
    3. c) Power down the monitor, then turn it on again to see if that corrects the problem
    4. d) Power down the computer, then turn it on again to see if that corrects the problem
  28. Which one of the following commands is used to restore the database to the last committed state?
    1. a) Savepoint
    2. b) Rollback
    3. c) Commit
    4. d) None of these
  29. A workstation has just been installed on an Ethernet LAN, but cannot communicate with the network. What should you check first?
    1. a) Reinstall the network protocols
    2. b) Reinstall the network interface card driver
    3. c) Verify the IP configuration on the workstation
    4. d) Verify the link status on the computer's network card
  30. Which is correct characteristic of Selection Sort?
    1. a) Time complexity O(n)
    2. b) Not Comparison-based sorting algorithm
    3. c) Time complexity O(n²)
    4. d) It is not in place sort
  31. To remove partial dependency from a database, which technique will you use?
    1. a) 1NF
    2. b) 2NF
    3. c) 3NF
    4. d) BCNF
  32. Which is the correct output? int i = 4; printf("%d %d", +1,i++); printf("%d", i++);
    1. a) 4 5 6
    2. b) 5 7 8
    3. c) 6 4 6
    4. d) 1 4 5
  33. Which one is not a flag of the 8086 microprocessor?
    1. a) Carry Flag
    2. b) Parity Flag
    3. c) Zero Flag
    4. d) State Flag
  34. Find the correct output: System.out.print('D' + 'E'+ 'F');
    1. a) 137
    2. b) DEF
    3. c) 207
    4. d) Compilation error
  35. Which one is the correct SQL statement to find the second highest mark from the STUDENT database that contains the marks of all students?
    1. a) Select MAX(marks) from STUDENT WHERE marks NOT IN (select MAX(marks) from STUDENT)
    2. b) Select MAX(marks) from STUDENT WHERE marks IN (select MAX(marks) from STUDENT)
    3. c) select MAX(marks) from STUDENT
    4. d) select MAX(marks) from STUDENT WHERE marks NOT IN (select MIN(marks) from STUDENT)
  36. Suppose you have a complete undirected graph with 4 nodes. What is the maximum number of Minimum Spanning Trees (MSTs) you can form?
    1. a) 4
    2. b) 8
    3. c) 16
    4. d) 1
  37. The Θ notation in asymptotic evaluation represents–
    1. a) Best case
    2. b) Tight bound (both upper and lower)
    3. c) Average case
    4. d) Worst case
  38. URL stands for-
    1. a) Universal Resource Locator
    2. b) Uniform Resource Locator
    3. c) Unique Resource Locator
    4. d) None
  39. Find the output of the following code: int a=15, b=15; if((a-100) == (b-a)) System.out.print(b+a); else System.out.print(b-a);
    1. a) 100
    2. b) 200
    3. c) 0
    4. d) 3
  40. Which is correct output? int a = 100; int *p = &a +2; *p = 22; printf("%d", a);
    1. a) 100
    2. b) 22
    3. c) Error
    4. d) Garbage value
  41. Which is the disadvantage of Optical Fiber?
    1. a) Resistance to corrosive materials
    2. b) Greater immunity to tapping
    3. c) Unidirectional light propagation
    4. d) None of these
  42. Related records of the different relations can be stored on the same block using which file organization technique?
    1. a) Heap file organization
    2. b) Sequential file organization
    3. c) Hashing file organization
    4. d) Multi-table Clustering file organization
  43. Find the correct output: int a = 10,b = 20; a ^= b; b ^= a; a ^= b; printf("%d %d", a, b);
    1. a) 20 30
    2. b) 10 30
    3. c) 20 10
    4. d) Garbage Value
  44. Which is the wrong statement about the BIOS of a computer?
    1. a) Connect microprocessor and I/O
    2. b) Manages data flow
    3. c) Loads the operating system
    4. d) Provide storage
  45. DHCP is-
    1. a) Dynamic Host Control Protocol
    2. b) Distributed Host Configuration Protocol
    3. c) Dynamic Host Configuration Protocol
    4. d) Domain Host Configuration Protocol
  46. Which one is not a database transaction property?
    1. a) Atomicity
    2. b) Consistency
    3. c) Durability
    4. d) Quality
  47. Which is correct for Merge sort-
    1. a) Time complexity, O(n²)
    2. b) Time complexity, O (n log n)
    3. c) Time complexity, O (log n)
    4. d) Not stable sort
  48. How many bits in IPv6?
    1. a) 32
    2. b) 64
    3. c) 128
    4. d) 156
  49. Which one is the loopback address?
    1. a) 255.255.255.0
    2. b) 127.0.0.1
    3. c) 255.0.0.0
    4. d) 127.127.127.0
  50. How can we prevent SQL Injection Attack?
    1. a) Show the database error to the users
    2. b) Use input validation
    3. c) Use the user input directly
    4. d) Do not remove potential malicious code
  51. Which of the following is not a true statement?
    1. a) Deleted files can be found in recycle bin
    2. b) Deleted files in recycle bin can be restored
    3. c) Disk space can be increased by sending files into recycle bin
    4. d) There may be multiple recycle bins
  52. Which one is not a layer of cloud computing?
    1. a) Computing as a service (CaaS)
    2. b) Infrastructure as a service (IaaS)
    3. c) Platform as a service (PaaS)
    4. d) Software as a service (SaaS)
  53. What is the postfix expression of the string a+(b-c)*d?
    1. a) abc-d*+
    2. b) abcd-*+
    3. c) ad*bc-
    4. d) abc-d+*
  54. Which of the following is not a function of a database administrator?
    1. a) Database design
    2. b) Backing up the database
    3. c) Query processing
    4. d) User coordination
  55. In which addressing mode, the effective address of the operand is generated by adding a constant value to the contents of the register?
    1. a) Absolute mode
    2. b) Indirect mode
    3. c) Immediate mode
    4. d) Index mode
  56. Most PCs give a single beep on boot up to indicate that the hardware is ok. If you do not get any beep, then what will be the first thing…
    1. a) System board
    2. b) RAM
    3. c) Power supply
    4. d) Speaker
  57. The simplified form of the Boolean expression (A+B+AB) (A+C) is-
    1. a) A + B + C
    2. b) AB + BC
    3. c) A+BC
    4. d) ACB
  58. Suppose you have an 8-bit binary number N. Which of the following operations does not change its lower 4 bits?
    1. a) An exclusive logical sum of N with 0Fh
    2. b) A negative logical product of N with 0Fh
    3. c) A logical product of N with 0Fh
    4. d) A logical sum of N with 0Fh
  59. Consider the following relational database– Order (OrderNumber, OrderDate, Promised Date) Orderline (OrderNumber, ProductID…
    1. a) One to One
    2. b) One to Many
    3. c) Many to Many
    4. d) Many to One
  60. 'সন্ধি' ব্যাকরণের কোন অংশে আলোচিত হয়?
    1. a) ধ্বনিতত্ত্ব
    2. b) অর্থতত্ত্ব
    3. c) বাক্যতত্ত্ব
    4. d) রূপতত্ত্ব
  61. বিভক্তিহীন নাম শব্দকে কী বলে?
    1. a) প্রকৃতি
    2. b) উপধা
    3. c) ধাতু
    4. d) প্রাতিপদিক
  62. 'রক্তাক্ত প্রান্তর' নাটকের পটভূমি-
    1. a) পলাশীর যুদ্ধ
    2. b) ভাষা আন্দোলন
    3. c) পানিপথের যুদ্ধ
    4. d) অসহযোগ আন্দোলন
  63. সঠিক সন্ধি বিচ্ছেদ কোনটি?
    1. a) বন + পতি = বনস্পতি
    2. b) অহঃ + রহ = অহরহ
    3. c) সং + সার = সংসার
    4. d) ছেলে + মি = ছেলেমি
  64. নিচের কোনটি মৌলিক শব্দ নয়?
    1. a) গোলাপ
    2. b) গায়ক
    3. c) হাত
    4. d) ফুল
  65. 'ঠিক', তুমি সত্য বলেছ।'-
    1. a) সিদ্ধান্ত আবেগ
    2. b) প্রশংসা আবেগ
    3. c) অলংকার আবেগ
    4. d) সম্বোধন আবেগ
  66. বাংলাদেশের নাটকে 'কথানাট্যের' পথিকৃৎ-
    1. a) সেলিম আল দীন
    2. b) সৈয়দ শামসুল হক
    3. c) আবদুল্লাহ আল মামুন
    4. d) মান্নান হীরা
  67. 'তুমি আসবে বলে হে স্বাধীনতা'- কার রচনা?
    1. a) আবু জাফর ওবায়দুল্লাহ
    2. b) আল মাহমুদ
    3. c) শামসুর রাহমান
    4. d) নির্মলেন্দু গুণ
  68. চর্যাপদে কোন পদকর্তার রচনা সর্বাধিক?
    1. a) লুই পা
    2. b) ভুসুক পা
    3. c) কাহ্ন পা
    4. d) শবরী পা
  69. 'অর্ণব' শব্দের অর্থ কী?
    1. a) সাগর
    2. b) নদী
    3. c) জলাশয়
    4. d) ঢেউ
  70. Which one word is closest in meaning to 'Franchise'?
    1. a) privilege
    2. b) superficial
    3. c) frankness
    4. d) openness
  71. The complex form of 'A rolling stone gathers no moss' is
    1. a) Though a stone roll, it gathers no moss
    2. b) A stone what rolls gathers no moss
    3. c) Since a stone is rolling it gathers no moss
    4. d) A stone that rolls gathers no moss
  72. Which word is spelt correctly?
    1. a) concensus
    2. b) hierarchy
    3. c) madieval
    4. d) posession
  73. The people who carry a coffin at a funeral are called _______
    1. a) undertakers
    2. b) supporters
    3. c) pallbearers
    4. d) mourners
  74. While living in poverty, the poet had to ____ a great deal of suffering.
    1. a) see through
    2. b) put up with
    3. c) pass by
    4. d) full back
  75. I differ ___ you ___ this question.
    1. a) against, about
    2. b) from, on
    3. c) to, for
    4. d) with, on
  76. Which phrase contains words opposed to each other in meaning?
    1. a) heat and dust
    2. b) reproduction and death
    3. c) hopes and aspirations
    4. d) emerged and advanced
  77. The _______ of the forest will result in the _______ of many animal species.
    1. a) destruction / disappear
    2. b) destruction / disappearance
    3. c) destructing / disappear
    4. d) destruct/disappearance
  78. If 5x + 4y = 22 and 3x + 5y = 21, what is the value of x and y?
    1. a) x=2, y=3
    2. b) x=2, y=-4
    3. c) x=3,y=7
    4. d) x=2, y=-3
  79. It is time to shut up the shop. (Passive)
    1. a) It is time to the shop the be shuted up
    2. b) It is time for the shop to shut up
    3. c) It is time for the shop to be shut up
    4. d) It is time for the shop to be shuted up
  80. If 3x+5y =14 and x-y = 6 then what is the average of x and y?
    1. a) 1
    2. b) 1.25
    3. c) 2
    4. d) 2.5
  81. Of the series 5+8+11+14_______ which term is 383?
    1. a) 122th
    2. b) 127th
    3. c) 136th
    4. d) 144th
  82. If a man rows at 5km/hr in still water and 3.5 km/hr against the current, find his rate along the current.
    1. a) 4 .25 km
    2. b) 4.5 km
    3. c) 6 km
    4. d) 6.5km
  83. Alom sold a radio at the cost of 1950 taka at a loss of 25%. At what cost will he have to sell it to get a profit of 30%?
    1. a) 4000
    2. b) 3380
    3. c) 3580
    4. d) 3400
  84. Of 100 students 90 passed in Bangla, 85 in Mathematics and 80 in both subjects. How many students failed in both subjects?
    1. a) 7
    2. b) 5
    3. c) 15
    4. d) 10
  85. If a = √3 + √2, then the value of a³ + 1/a³ = ?
    1. a) 10√3
    2. b) 12√3
    3. c) 12√3
    4. d) 18√3
  86. The loss is 30% when 10 lemons are sold per taka. How many lemons are to be sold per taka to make a profit of 40%?
    1. a) 2
    2. b) 6
    3. c) 5
    4. d) 10
  87. The ratio of milk and water in 64 liters of a mixture is 5:3. What amount of water is added to make the ratio 3:5?
    1. a) 42⅔
    2. b) 50⅖
    3. c) 35⅔
    4. d) 40⅗
  88. Nassau is the capital city of–
    1. a) The Bahamas
    2. b) The Nicobar Islands
    3. c) Madagascar
    4. d) The Cubies
  89. What are the small indentations on a golf ball called?
    1. a) Birdie
    2. b) Albatross
    3. c) Mulligan
    4. d) Dimples
  90. When did Bangabandhu declared historic six point programme?
    1. a) February 4, 1966
    2. b) February 5, 1966
    3. c) February 6, 1966
    4. d) February 7, 1966
  91. The length of Dhaka Metro Rail will be–
    1. a) 19.10 km
    2. b) 20.10 km
    3. c) 21.10 km
    4. d) 20.50 km
  92. As per the latest changes in Bengali Calendar, leap year is calculated in which month?
    1. a) Boishakh
    2. b) Bhadro
    3. c) Ashwin
    4. d) Falgun
  93. Which country gave the 'Statue of Liberty' to the United States of America as a gift?
    1. a) France
    2. b) Great Britain
    3. c) Germany
    4. d) Russia
  94. Who is the builder of the 'Sat Gumbad' (Seven-domed) mosque?
    1. a) Shaesta Khan
    2. b) Khan Jahan Ali
    3. c) Isha Khan
    4. d) Islam Khan
  95. When is the 'International Day of the Victims of Enforced Disappearances' observed?
    1. a) August 15
    2. b) August 30
    3. c) September 15
    4. d) September 30
  96. Free Market Economy started in Bangladesh in–
    1. a) 1989
    2. b) 1990
    3. c) 1991
    4. d) 1992
  97. Which countries are jointly called the 'Golden Crescent'?
    1. a) Afghanistan, Iran and Pakistan
    2. b) Afghanistan, India and Pakistan
    3. c) Iraq, Lebanon and Syria
    4. d) Thailand, Laos and Myanmar

Written (11)

  1. Explain Impact printer and Non-impact printer.
  2. What is the difference between OOP and POP?
  3. What is the difference between Overloading and Overriding?
  4. Simplify using K-Map: F (W,X,Y,Z) = ∑(3,5,7,9,11,13,14,15)
  5. Explain: Swapping, Virtual Memory.
  6. What is NAT? Why is it used and how does NAT translate?
  7. TDM math: rate = 1.536 Mbps, message size = 960000, slots = 32, end-to-end circuit switch time = 800 ms. Calculate the transfer time.
  8. If main memory access time is 100ns, cache access time is 50 ns, cache hit rate is 90% then what is the average time to read from memory?
  9. ER diagram to Schema diagram: Rectangles are entity sets, diamonds are relationship sets, rounded boxes are attributes; "(key)" marks an…
  10. Explain Confidentiality and Integrity. Can you have confidentiality without integrity? Can you have integrity without confidentiality?
  11. Given the classless IP 105.38.89.230/20, find the Net Id, Host Id, network address, broadcast address and network size. If classful…

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