# HSC ICT Chapter 3 : Comprehension Based Questions & Answers

## How to write answers to a comprehension based question?

‘Comprehension’ refers to the ability to understand the meaning of a topic. It can be the ability to understand any information, policy, formula, rule, procedure, process etc.

Perceptual level is the second level of thinking skills. This question is given in ‘b’. Such questions do not directly ask for textbook-like details. So the student has to explain or describe the content in his own way.

Marks of comprehension based question will be 2. Out of which 1 is for knowledge and 1 is for comprehension.

Comprehension based questions should be answered in two paragraphs. Answers to knowledge section in the first paragraph and understanding section in the second paragraph.

Answers to comprehension based questions should be written in a maximum of five sentences as per the instruction of the Ministry of Education. But there is no problem if it is a little more or less.

In this case, irrelevant words, unnecessary information or redundant accusations cannot be made in the answer to the question.

## 2019, 2018, 2017 and 2016 Board Questions

1. “All digits are numbers but all numbers are not digits”- Explain.
2. “Tally is a non-positional number system”- Explain.
3. Why is the number (11)₁₀ called a positional number? [Jessore Board-2017]
4. What kind of number is 10101 in the number system? Explain
5. What type of number is 988 in the number system? Explain.
6. What kind of number is 5D? Explain [Cumilla Board-2017]
7. Is the number (298)₈ correct?- Explain. [Sylhet Board-2016]
8. Explain the base of the number system.
9. Explain 3-based number system. [A-Set: Dhaka, Jessore, Sylhet and Dinajpur Board-2018]
10. “Binary number system is compatible with the working of internal components of computer”- Explain.
11. Explain the number system used in digital devices. [Dinajpur Board-2019]
12. Explain the importance of binary number system in digital devices. [Cumilla Board-2016]
13. The number (267)₁₀ is not directly accepted by the computer – explain. [Chittagong Board-2016]
14. Why are digital signals useful in computers? Explain.
15. Write the difference between bit and byte.
16. How do you differentiate between hexadecimal and decimal number systems?
17. “Octal is 3-bit Code”- Explain. [Dinajpur Board-2016]
18. “Hexadecimal is 4-bit code”- Explain.
19. “The next number of 1 can be 10” – Explain.
20. “The next number of 77 can be 100” – Explain.
21. “The next number of FF can be 100” -Explain. [Barisal Board-2019]
22. “It can be F+1=10” – Explain.
23. Is 9+7=10 possible? Explain. [Comilla Board-2019]
24. Why 3+5=10? – Explain. [Chittagong Board-2017]
25. “It can be A+7=11 ” – Explain.
26. “It can be 6+5+3=1110” – Explain. [Dhaka Board-2019]
27. What do you understand by signed number? Explain [Madrasa Board-2016]
28. Discuss the importance of 2’s complement form. [B-Set: Rajshahi, Cumilla, Chittagong & Barisal Board-2018, Dinajpur Board-2017]
29. “2’s complement simplifies digital circuits” – Explain. [Rajshahi Board-2019]
30. “Subtraction is possible by addition.” – Explain.  [Rajshahi Board-2016]
31. “2’s complement changes only the sign of the number”-Explain. [Sylhet Board-2019]
32. Which of the BCD and binary number equivalent to (14)₁₀ requires more bits? Explain. [Barisal Board-2017]
33. “BCD is not a number system”- Explain.
34. Why is BCD written in 4-bit? Explain
35. Explain the most commonly used alphanumeric code before Unicode. [Dhaka Board-2017]
36. “Unicode is a blessing for all the speaking people of the world”-Explain. [Chittagong Board-2017]
37. “Unicode is Universal Code” – Explain.
38. Unicode can understand ‘Bangla’ language – explain. [Dhaka Board-2019]
39. Describe the code used to encode all the world’s languages ​​by computer.
40. “It has been possible to coded all the languages ​​of the world”- Explain. [Jessore Board-2019]
41. “Unicode is compatible with ASCII Code” – Explain.
42. Write the difference between BCD and EBCDIC.
43. Write the difference between ASCII and Unicode.
44. Write reasons for the use of Boolean algebra in digital devices.
45. Write the difference between simple algebra and Boolean algebra.
46. “1+1+1=1” –Explain. [Chittagong Board-2019]
47. “1+1=1” –Explain. [Dhaka Board-2016]
48. “T+T=T” – Explain.
49. “A+1=1”- Explain.
50. “M ( M + N ) = M” – Explain. [Comilla Board-2019]
51. In which argument 1+1=1 and 1+1=10 can be written? – Explain. [Rajshahi Board-2017]
52. Binary 1+1 and Boolean 1+1 are not same. –Explain. [Sylhet Board-2017]
54. Why truth table is used? – Explain.
55. Write difference between min-term and max-term.
56. Explain the necessity of simplifying Boolean functions.
57. Describe De-Morgan’s theorem for n-number of variables.
58. Why are Boolean functions simplified? explain.
59. “If any one of the inputs is false in AND gate, Output becomes false”- Explain.
60. AND gate indicates logical multiplication. Explain.
61. “If any one of the inputs is true in OR gate, Output becomes true ”- Explain.
62. OR gate indicates logical addition. Explain. [Jessore Board-2016]
63. Output of a logic gate is logical inverse to the input. -Explain. [Cumilla Board-2017]
64. Output is logical inverse to the input. -Explain.
65. “X-OR gate is a combinational logic circuit of all basic gates”-Explain.
66. Which basic gate can be used to construct X-OR gate? explain.
67. “X-NOR gate is a combinational logic circuit of all basic gates”-Explain. [Barisal Board-2016]
68. Which basic gates are used in implementing X-NOR gate? Explain.
69. What will be the output of XOR gate if an input is 1 and another is A?
70. Explain the advantages of XOR over OR gate.
71. Which gates are called universal gate?
72. “NAND gate is called universal gate”-Explain.
73. “When all the inputs of a NAND gate are same, the gate acts as a basic gate”-Explain.
74. Implement OR gate using only NAND gate. [Dinajpur Board-2019]
75. Implement AND gate using only NAND gate.
76. Implement XOR gate using only NAND gate.
77. Implement XNOR gate using only NAND gate.
78. How many NAND gates are required to implement a 5-input AND gate? explain. [Sylhet Board-2019]
79. How many NAND gates are required to implement a 3-input OR gate? explain.
80. “NOR gate is called universal gate”-Explain.
81. “A NOR gate acts as a basic gate when all inputs are the same” -Explain. [A-Set: Dhaka, Jessore, Sylhet and Dinajpur Board-2018]
82. Implement OR gate using only NOR gate.
83. Implement AND gate using only NOR gate.
84. Implement XOR gate using only NOR gate.
85. Implement XNOR gate using only NOR gate.
86. How many NOR gates are required to implement a 5-input OR gate? explain.
87. How many NOR gates are required to implement a 3-input AND gate? explain.
88. Write the difference between combinational and sequential circuit.
89. Explain the circuit that converts machine comprehensible language into human comprehensible language. [Chittagong Board-2019, Dhaka-2017]
90. Explain the device for converting coded data to uncoded data. [Jessore Board-2019]
91. Why are encoders used with input devices? explain.
92. ​​“Encoder plays important roles in digital devices” – Explain. [B-Set: Rajshahi, Cumilla, Chittagong & Barisal Board-2018]
93. Explain the circuit that converts human comprehensible language into machine comprehensible language.
94. Why is decoder used with output device? explain
95. Encoder is the inverse of the decoder. Explain.
96. Write the difference between encoder and decoder.
97. Computer performs all the calculations using only one method. Explain.
98. What is the maximum number a 4-bit binary counter can count?-Explain.
99. “There are four flip-flops in a 4-bit register”-Explain. [Sylhet Board-2017]
আরো পড়ুন ::  Encoder and Decoder | Difference Between Encoder and Decoder

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1. John Ametefe says: