BUET MSC (ICT) July 2021 – MCQ question & solution

Questions from the BUET MSC (ICT) recruitment exam, July 2021 – MCQ, shared by the candidates who sat it. The paper: 57 MCQs. So far 57 MCQs have been shared. Topics include Computer Networks, Coding, Digital Logic, Computer Architecture and Circuit Analysis.

MCQ (57)

  1. A capacitor in an RC circuit with R=2 ohm and C=4 F is being charged. The time required for the capacitor voltage to reach 63.2 percent of…
    1. a) 4 s
    2. b) 8 s
    3. c) 1/2 s
    4. d) None of these
  2. How many valid hosts are available for the network segment 192.166.2.16/28?
    1. a) 16
    2. b) 8
    3. c) 15
    4. d) 14
  3. What is the output of the following code segment? string cars[4] = {"Volvo", "BMW", "Ford", "Mazda"}; cout<<cars[3]; cout<<cars[2];
    1. a) Mazda, Ford
    2. b) Ford BMW
    3. c) MazdaFord
    4. d) Mazda Ford
  4. Which circuit can be used as a parallel-to-serial converter?
    1. a) A decoder
    2. b) An encoder
    3. c) De-multiplexer
    4. d) Multiplexer
  5. If the message bits are 111 then the Even-parity bit will be:
    1. a) 1111
    2. b) 1
    3. c) 0
    4. d) None
  6. Which function in the following expression will be called first? a = func3(6)-func2(4,5)/func1(1,2,3);
    1. a) func1();
    2. b) func2();
    3. c) func3();
    4. d) Cannot be predicted
  7. An organization is granted block 130.34.12.64/26. Find the number of addresses for the whole network.
    1. a) 128
    2. b) 32
    3. c) 256
    4. d) None
  8. Difference between Latch and Flip-flop is:
    1. a) Flip-flop has a clock but Latch doesn't have
    2. b) Flip-flop is edge-triggered but Latch is level triggered
    3. c) Both are true
    4. d) None are true
  9. Which of the following sequences does a microprocessor follow?
    1. a) Fetch, decode, execute
    2. b) Fetch, execute, decode
    3. c) Decode, fetch, execute
    4. d) Execute, decode, fetch
  10. What is the content of the Stack Pointer (SP)?
    1. a) Address of the current instruction
    2. b) Address of the next instruction
    3. c) Address of the top element of the stack
    4. d) Size of the stack.
  11. An address in the main memory is called ________.
    1. a) Physical address
    2. b) Logical address
    3. c) Memory address
    4. d) Word address
  12. Which of the following formats is usually used to store data?
    1. a) Decimal
    2. b) BCD
    3. c) Octal
    4. d) Hexadecimal
  13. If in an RLC series circuit source voltage 100 sinωt V, resistance 10 ohm, inductive reactance 10 ohm and capacitive reactance 10 ohm…
    1. a) 10 A
    2. b) 3.33 A
    3. c) 3.33 sinωt A
    4. d) 10 sinωt A
  14. The number of operations processed per second by a processor is called
    1. a) Instruction processor
    2. b) Bandwidth
    3. c) Clock Speed
    4. d) Frequency
  15. The voltage induced in an inductor is represented as,
    1. a) product of its inductance and current through it
    2. b) ratio of its inductance to the current through it.
    3. c) ratio of current through it to its inductance.
    4. d) product of its inductance and rate of change of current through it.
  16. What will be the output of the following C code? #include<stdio.h> int main(){ register static int i = 10; i = 11; printf("%d\n", i)…
    1. a) 10
    2. b) Compile-time error
    3. c) Undefined behavior
    4. d) 11
  17. _____ is a group of networks and routers under the authority of a single administration.
    1. a) An autonomous system
    2. b) An Area
    3. c) A System
    4. d) Both an autonomous system and an area
  18. Bridges are used at ________ layer.
    1. a) Physical layer
    2. b) MAC layer
    3. c) Network layer
    4. d) Transport layer
  19. DMA stands for?
    1. a) Direct Memory Access
    2. b) Direction Memory Access
    3. c) Dictate Memory Accumulator
    4. d) Direct Memory Accumulator
  20. Superposition principle states that at a time __________ source(S) acts.
    1. a) all the given sources
    2. b) only voltage sources
    3. c) only one source
    4. d) only current sources
  21. A D flip-flop is having three inputs D, CLK and CLR. Which input is asynchronous?
    1. a) D
    2. b) CLK
    3. c) CLR
    4. d) None
  22. At ______ frequencies the parallel R-L circuit behaves as purely resistive.
    1. a) very low
    2. b) low
    3. c) high
    4. d) very high
  23. Which of the following is the correct syntax to pass a Function Pointer as an argument?
    1. a) void pass(int (*fptr)(int, float, char)){}
    2. b) void pass(*fptr(int, float, char)){}
    3. c) void pass(int (*fptr)){}
    4. d) void pass(*fptr){}
  24. An electrical series circuit consists of a 100V battery, 20-Ohm resistance and a 5μF capacitance. The voltage drop across 20-Ohm…
    1. a) 5V
    2. b) 4V
    3. c) 0V
    4. d) 100V
  25. The maximum addressing capacity of a microprocessor that uses 16-bit data bus & 32-bit address bus is:
    1. a) 64 K.
    2. b) 4 GB
    3. c) Both 64 K and 4 GB
    4. d) None of these
  26. What will be the output of the following C code? #include<stdio.h> int main(){ int x; int i = 5; int l = i /-2; int k = i % -2; printf("%d…
    1. a) -2 1
    2. b) -1 1
    3. c) 1 -1
    4. d) Implementation defined
  27. The imaginary part of the admittance of an AC circuit is:
    1. a) Resistance
    2. b) Conductance
    3. c) Reactance
    4. d) Susceptance
  28. What will be the output of the following pseudocode? Integer a, b Set a = 15, b = 7 a = a mod (a - 3) b = b mod (b - 3) a = a mod 1 b = b…
    1. a) 15
    2. b) 7
    3. c) 0
    4. d) 2
  29. Generally, Dynamic RAM is used as main memory in a computer system as it:
    1. a) Consumes less power
    2. b) Has higher speed
    3. c) Has lower cell density
    4. d) Needs refreshing circuitry
  30. 2's complement of 00000000 is:
    1. a) 11111111
    2. b) 10000000
    3. c) 00000000
    4. d) 00000001
  31. How to convert a JK flip-flop to a T flip-flop?
    1. a) by adding a NOT Gate
    2. b) by adding an AND Gate
    3. c) by adding an X-OR Gate
    4. d) No extra gate is required
  32. If an object is passed by value, ___________
    1. a) Copy constructor is used to copy the values into temporary object
    2. b) Copy constructor is used to copy the values into another object in the function
    3. c) Reference to the object is used to access the values of the object
    4. d) Reference to the object is used to create a new object in its place
  33. Suppose you have many 4×1 MUXes. You need a 16×1 MUX. How many 4×1 MUX you are required to build a 16×1 MUX:
    1. a) 3
    2. b) 4
    3. c) 5
    4. d) 6
  34. Consider an array of float. Calculate the difference between the address of the 1st and 4th element, assuming float occupies 4 bytes of…
    1. a) 12
    2. b) 4
    3. c) 16
    4. d) 8
  35. In a Johnson counter:
    1. a) the output of the first flip-flop is connected to the input of the last flip-flop
    2. b) the output of the last flip-flop is connected to the input of the first flip-flop
    3. c) the inverted output of the last flip-flop is connected to the input of the first flip-flop
    4. d) None
  36. IP Address of a network is 192.120.105.0. What will be the maximum subnet number fulfilling the condition that each subnet can accommodate…
    1. a) 20
    2. b) 32
    3. c) 16
    4. d) 8
  37. You are working with three networks that have the network IDs 192.168.5.0, 192.168.6.0 and 192.168.7.0. What subnet mask can you use to…
    1. a) 255.255.252.0
    2. b) 255.255.254.0
    3. c) 255.155.240.0
    4. d) 255.255.255.252
  38. In an IP packet, what is the maximum size of an IP header?
    1. a) 20 B
    2. b) 4 B
    3. c) 14 B
    4. d) 60 B
  39. If we apply 0001 to the input of a seven-segment decoder then what will be the outputs?
    1. a) 0110000 for a seven-segment display with common-cathode
    2. b) 1001111 for a seven-segment display with common-anode
    3. c) Both A and B are true
    4. d) None are true
  40. Which one is an example of routed protocol?
    1. a) IP
    2. b) RIP
    3. c) IGRP
    4. d) OSPF
  41. The term '%i' is used for _____ data type too.
    1. a) char
    2. b) int
    3. c) none of the above
    4. d) float
  42. What remains always local on the LAN and never goes through a router?
    1. a) MAC address
    2. b) IP Address
    3. c) Logical Address
    4. d) None of the above
  43. An electrical Y network has a 1-ohm resistor in each arm. The equivalent Delta network will have each arm with:
    1. a) 3 Ohm
    2. b) 1/3 Ohm
    3. c) 4 Ohm
    4. d) 1 Ohm
  44. If class C inherits class B, and B has inherited class A, then while creating the object of class C, what will be the sequence of…
    1. a) Constructor of C then B, finally of A
    2. b) Constructor of A then C, finally of B
    3. c) Constructor of A then B, finally C
    4. d) Constructor of C then A, finally B
  45. A Program Counter contains the number 825 and address part of the instruction contains the number 24. The effective address in the…
    1. a) 849
    2. b) 850
    3. c) 801
    4. d) 802
  46. What will be the output of the following C code? #include<stdio.h> void main(){ int k = 7; int *p = &k; int **m = &p; printf("%d%d%d\n"…
    1. a) 5 5 5
    2. b) 5 5 junk value
    3. c) 7 7 7
    4. d) Compile-time error
  47. If V1=50sin (ωt+10) and V2=30sin (ωt+50) then:
    1. a) V1 leads V2
    2. b) V2 leads V1
    3. c) V2 lags V1
    4. d) V1 and V2 in phase
  48. The average time required to reach a storage location in memory and obtain its contents is called the-
    1. a) seek time
    2. b) turnaround time
    3. c) access time
    4. d) transfer time
  49. Which routing protocol does not consume the bandwidth of the network?
    1. a) Default routing
    2. b) Dynamic routing
    3. c) Static routing
    4. d) None of the above
  50. Advantage of JK Flip-flop over SR Flip-flop is:
    1. a) It is faster than SR
    2. b) It has no forbidden state
    3. c) It has no toggle state
    4. d) All of the above
  51. Which of the following is NOT a component of a microprocessor?
    1. a) ALU
    2. b) Register Array
    3. c) Hard Disk
    4. d) Control Unit
  52. What is the expression for Thevenin's current if there is an external resistance in series with the Rth?
    1. a) Vth/Ith
    2. b) Vth/ (Rth-R)
    3. c) Vth/ (Rth+R)
    4. d) Vth/Rth
  53. In a priority encoder:
    1. a) first bit is considered don't care
    2. b) higher priority bit is considered don't care
    3. c) lower priority bit is considered don't care
    4. d) None
  54. Assume Ā, B̄, C̄ and D̄ represent the complements of A, B, C and D, respectively. Now in a 4-variable (ABCD) logic circuit K-map (AB makes…
    1. a) Ā B̄ C D
    2. b) Ā B C D̄
    3. c) Ā B C D
    4. d) ABCD
  55. An instruction pipeline can be implemented by means of:
    1. a) LIFO buffer
    2. b) FIFO buffer
    3. c) Stack
    4. d) None of the above
  56. Internet Group Management Protocol (IGMP) is __________ protocol.
    1. a) An error reporting
    2. b) A group management
    3. c) A transmission
    4. d) None of the above.
  57. The r.m.s. value of alternating current is given by steady (D.C.) current which when flowing through a given circuit for a given time…
    1. a) the more heat than produced by A.C. when flowing through the same circuit
    2. b) the same heat as produced by A.C. when flowing through the same circuit
    3. c) the less heat than produced by A.C. flowing through the same circuit
    4. d) None

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