# Third Chapter: Comprehension Based Questions & Answers.

1. What is meant by the base of the number system? Explain it.
2. Why the base of hexadecimal number system is 16? Explain.
3. The next number of 1 is 10. Explain.
4. Why the number (11)10 is called positional number?
5. Which type of number is 3D? Explain.
6. Which type of number is 10101 in number system? Explain.
7. Which type of number is 988? Explain.
8. Is (298)8 valid? –Explain.
9. Explain the positional value of decimal number system.
10. Computer cannot understand (169)10 Explain it.
11. Binary number system is similar to the functions of internal parts of the computer. Explain.
12. Why digital signal is significant in computer system? Explain.
13. Write down the reasons for using binary number system in computer design.
14. How will you differentiate decimal and hexadecimal number system?
15. “Octal number system is called 3-bit number system” -Explain.
16. “Hexadecimal number system is called 4-bit number system” -Explain.
17. How 3+5=10? Explain
18. How 9+7=20/8+8=10/A+7=11? Explain.
19. What do you understand by signed number? Explain.
20. Why 2’s complement is important? -Explain.
21. Subtraction can be performed using addition. –Explain.
22. Which one of the equivalent BCD code and binary numbers of (15)10 takes bit more? Explain.
23. “BCD code is not a number system” -Explain.
24. Explain the mostly used alphanumeric code before discovering Unicode.
25. Unicode is a blessing for all the people speaking in different languages in computer system.- Explain.
26. Explain the code which makes the computer understand all the languages.
27. Unicode is suitable for all languages in computer system.-Explain
28. “1+1+1=1” –Explain.
29. “T+T=T” – Explain.
30. “A+1=1”- Explain.
31. In which argument 1+1=1 and 1+1=10 can be written? –Explain.
32. Binary 1+1 and Boolean 1+1 are not same. –Explain.
34. Why truth table is used?
35. Describe De-Morgan’s theorem for n number of variables.
36. “If any one of the inputs is false in AND gate, Output becomes false”- Explain.
37. AND gate indicates logical multiplication. Explain.
38. OR gate indicates logical addition. Explain.
39. Output of a logic gate is inverse to the given input. Explain.
40. “X-OR gate is a combinational logic gate of all basic gates”-Explain.
41. Which basic gates are used in implementing X-OR gate? Explain.
42. Explain the advantages of XOR over OR gate.
43. What will be the output of XOR gate if an input is 1 and another is A?
44. Implement X-OR gate using only NAND gates.
45. Which gates are called universal gate?
46. “NAND gate is called universal gate”-Explain.
47. “NOR gate is called universal gate”-Explain.
48. Bulb is not lightened if two switches are ON- Explain in case of logic gate.
49. What do you understand by combinational circuit?
50. Computer performs all the calculations using only one method. Explain.
51. Explain the circuit that converts human comprehensible language into machine comprehensible language.
52. Explain the circuit that converts machine comprehensible language into human comprehensible language.
53. Encoder is the inverse of the decoder. Explain.
54. “There are four flip-flops in a 4-bit register”-Explain.