## 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

- “All digits are numbers but all numbers are not digits”- Explain.
- “Tally is a non-positional number system”- Explain.
- Why is the number (11)₁₀ called a positional number? [Jessore Board-2017]
- What kind of number is 10101 in the number system? Explain
- What type of number is 988 in the number system? Explain.
- What kind of number is 5D? Explain [Cumilla Board-2017]
- Is the number (298)₈ correct?- Explain. [Sylhet Board-2016]
- Explain the base of the number system.
- Explain 3-based number system. [A-Set: Dhaka, Jessore, Sylhet and Dinajpur Board-2018]
- “Binary number system is compatible with the working of internal components of computer”- Explain.
- Explain the number system used in digital devices. [Dinajpur Board-2019]
- Explain the importance of binary number system in digital devices. [Cumilla Board-2016]
- The number (267)₁₀ is not directly accepted by the computer – explain. [Chittagong Board-2016]
- Why are digital signals useful in computers? Explain.
- Write the difference between bit and byte.
- How do you differentiate between hexadecimal and decimal number systems?
- “Octal is 3-bit Code”- Explain. [Dinajpur Board-2016]
- “Hexadecimal is 4-bit code”- Explain.
- “The next number of 1 can be 10” – Explain.
- “The next number of 77 can be 100” – Explain.
- “The next number of FF can be 100” -Explain. [Barisal Board-2019]
- “It can be F+1=10” – Explain.
- Is 9+7=10 possible? Explain. [Comilla Board-2019]
- Why 3+5=10? – Explain. [Chittagong Board-2017]
- “It can be A+7=11 ” – Explain.
- “It can be 6+5+3=1110” – Explain. [Dhaka Board-2019]
- What do you understand by signed number? Explain [Madrasa Board-2016]
- Discuss the importance of 2’s complement form. [B-Set: Rajshahi, Cumilla, Chittagong & Barisal Board-2018, Dinajpur Board-2017]
- “2’s complement simplifies digital circuits” – Explain. [Rajshahi Board-2019]
- “Subtraction is possible by addition.” – Explain. [Rajshahi Board-2016]
- “2’s complement changes only the sign of the number”-Explain. [Sylhet Board-2019]
- Which of the BCD and binary number equivalent to (14)₁₀ requires more bits? Explain. [Barisal Board-2017]
- “BCD is not a number system”- Explain.
- Why is BCD written in 4-bit? Explain
- Explain the most commonly used alphanumeric code before Unicode. [Dhaka Board-2017]
- “Unicode is a blessing for all the speaking people of the world”-Explain. [Chittagong Board-2017]
- “Unicode is Universal Code” – Explain.
- Unicode can understand ‘Bangla’ language – explain. [Dhaka Board-2019]
- Describe the code used to encode all the world’s languages by computer.
- “It has been possible to coded all the languages of the world”- Explain. [Jessore Board-2019]
- “Unicode is compatible with ASCII Code” – Explain.
- Write the difference between BCD and EBCDIC.
- Write the difference between ASCII and Unicode.
- Write reasons for the use of Boolean algebra in digital devices.
- Write the difference between simple algebra and Boolean algebra.
- “1+1+1=1” –Explain. [Chittagong Board-2019]
- “1+1=1” –Explain. [Dhaka Board-2016]
- “T+T=T” – Explain.
- “A+1=1”- Explain.
- “M ( M + N ) = M” – Explain. [Comilla Board-2019]
- In which argument 1+1=1 and 1+1=10 can be written? – Explain. [Rajshahi Board-2017]
- Binary 1+1 and Boolean 1+1 are not same. –Explain. [Sylhet Board-2017]
- “Binary addition and Boolean addition are not same”- Explain.
- Why truth table is used? – Explain.
- Write difference between min-term and max-term.
- Explain the necessity of simplifying Boolean functions.
- Describe De-Morgan’s theorem for n-number of variables.
- Why are Boolean functions simplified? explain.
- “If any one of the inputs is false in AND gate, Output becomes false”- Explain.
- AND gate indicates logical multiplication. Explain.
- “If any one of the inputs is true in OR gate, Output becomes true ”- Explain.
- OR gate indicates logical addition. Explain. [Jessore Board-2016]
- Output of a logic gate is logical inverse to the input. -Explain. [Cumilla Board-2017]
- Output is logical inverse to the input. -Explain.
- “X-OR gate is a combinational logic circuit of all basic gates”-Explain.
- Which basic gate can be used to construct X-OR gate? explain.
- “X-NOR gate is a combinational logic circuit of all basic gates”-Explain. [Barisal Board-2016]
- Which basic gates are used in implementing X-NOR gate? Explain.
- What will be the output of XOR gate if an input is 1 and another is A?
- Explain the advantages of XOR over OR gate.
- Which gates are called universal gate?
- “NAND gate is called universal gate”-Explain.
- “When all the inputs of a NAND gate are same, the gate acts as a basic gate”-Explain.
- Implement OR gate using only NAND gate. [Dinajpur Board-2019]
- Implement AND gate using only NAND gate.
- Implement XOR gate using only NAND gate.
- Implement XNOR gate using only NAND gate.
- How many NAND gates are required to implement a 5-input AND gate? explain. [Sylhet Board-2019]
- How many NAND gates are required to implement a 3-input OR gate? explain.
- “NOR gate is called universal gate”-Explain.
- “A NOR gate acts as a basic gate when all inputs are the same” -Explain. [A-Set: Dhaka, Jessore, Sylhet and Dinajpur Board-2018]
- Implement OR gate using only NOR gate.
- Implement AND gate using only NOR gate.
- Implement XOR gate using only NOR gate.
- Implement XNOR gate using only NOR gate.
- How many NOR gates are required to implement a 5-input OR gate? explain.
- How many NOR gates are required to implement a 3-input AND gate? explain.
- Write the difference between combinational and sequential circuit.
- Explain the circuit that converts machine comprehensible language into human comprehensible language. [Chittagong Board-2019, Dhaka-2017]
- Explain the device for converting coded data to uncoded data. [Jessore Board-2019]
- Why are encoders used with input devices? explain.
- “Encoder plays important roles in digital devices” – Explain. [B-Set: Rajshahi, Cumilla, Chittagong & Barisal Board-2018]
- Explain the circuit that converts human comprehensible language into machine comprehensible language.
- Why is decoder used with output device? explain
- Encoder is the inverse of the decoder. Explain.
- Write the difference between encoder and decoder.
- Computer performs all the calculations using only one method. Explain.
- What is the maximum number a 4-bit binary counter can count?-Explain.
- “There are four flip-flops in a 4-bit register”-Explain. [Sylhet Board-2017]

**Written by,**

- Mizanur Rahman (Mizan)
- Lecturer in ICT, Shaheed Bir Uttam Lt. Anwar Girls’ College , Dhaka Cantonment
- Founder & Author at www.edupointbd.com
- Software Engineer at mands IT
- Former Lecturer in ICT, Cambrian College, Dhaka
- Contact:
**01724351470**

Great work done