This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Computer Science > Class 12 Computer Science Chapter 6 Boolean Algebra And Logic Gates – Quiz 5 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Computer Science Chapter 6 Boolean Algebra And Logic Gates Quiz 5 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. 6) Which among the below stated boolean expressions do not obey De-Morgan's theorem? A) X+Y = X . Y. B) X.Y = X + Y. C) X.Y = X.Y. D) None of the above. Show Answer Correct Answer: C) X.Y = X.Y. 2. According to the associative law: A) (A+B)+C=A+(B+C). B) A+B=B+A. C) A=A+A. D) A+0=A. Show Answer Correct Answer: A) (A+B)+C=A+(B+C). 3. De Morgan's Theorem:(AB)' =? A) A'B'. B) A' + B'. C) A + B. D) A' + B'. Show Answer Correct Answer: B) A' + B'. 4. The associative law of multiplication for three variables is written as A (BC) = ..... A) (AB) + C. B) A + (BC). C) (AB) C. D) (A + B) + C. Show Answer Correct Answer: B) A + (BC). 5. The expression (AB)'+(BC)' can also be written as A) A+B+C. B) (A'BC)'. C) (ABC)'. D) None. Show Answer Correct Answer: C) (ABC)'. 6. What is the output of an XOR gate when both inputs are the same? A) Undefined. B) 0. C) It depends on the number of inputs. D) 1. Show Answer Correct Answer: B) 0. 7. Why is abstraction important in computer engineering? A) It simplifies the design process. B) It reduces the cost of components. C) It increases the speed of development. D) All of the above. Show Answer Correct Answer: A) It simplifies the design process. 8. Select the correct meaning of the symbol in Boolean algebra. A) OR operation. B) AND operation. C) NOT operation. D) XOR operation. Show Answer Correct Answer: B) AND operation. 9. How many input and output required for multiplexer? A) Many input and one output. B) One input and many output. C) One input and one output. D) None of the above. Show Answer Correct Answer: A) Many input and one output. 10. What would the following condition return?5 > 2 A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 11. Identify the logic gate that produces the complement of its input. A) OR. B) NOR. C) NOT. D) NAND. Show Answer Correct Answer: C) NOT. 12. NOR function is dual of A) AND function. B) OR function. C) XOR function. D) NAND function. Show Answer Correct Answer: D) NAND function. 13. When ordering binary numbers for a Karnaugh Map, which of the following is the correct sequence? A) 00, 01, 10, 11. B) 11, 10, 01, 00. C) 00, 11, 10, 01. D) 00, 01, 11, 10. Show Answer Correct Answer: D) 00, 01, 11, 10. 14. ..... input values will cause an AND logic gate to produce a HIGH output. A) At least one input is HIGH. B) At least one input is LOW. C) All inputs are HIGH. D) All inputs are LOW. Show Answer Correct Answer: C) All inputs are HIGH. 15. What is the output of NOT 1? A) 0. B) 1. C) All the above. D) None of the above. Show Answer Correct Answer: A) 0. 16. 2) A ..... gate gives the output as 1 only if all the inputs signals are 1. A) AND. B) OR. C) EXOR. D) NOR. Show Answer Correct Answer: A) AND. 17. AND gate output is HIGH when A) Any input is HIGH. B) All inputs are HIGH. C) All inputs LOW. D) Any input LOW. Show Answer Correct Answer: B) All inputs are HIGH. 18. True or False:Logic gates allow programmers to create more abstract and complex computer functions. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 19. What does a half adder circuit do? A) Adds two binary digits and produces a sum and a carry output. B) Subtracts two binary numbers. C) Adds multiple binary numbers at once. D) Performs logical AND and OR operations. Show Answer Correct Answer: A) Adds two binary digits and produces a sum and a carry output. 20. K-map for 3 variables has A) 16 cells. B) 12 cells. C) 8 cells. D) 6 cells. Show Answer Correct Answer: C) 8 cells. 21. In a logic circuit, what does the AND gate represent? A) A parallel circuit. B) A series circuit. C) A short circuit. D) An open circuit. Show Answer Correct Answer: B) A series circuit. 22. Convert this base 2 number to base 10:10011 A) 18. B) 19. C) 22. D) 20. Show Answer Correct Answer: B) 19. 23. What is the system of notation that represents information using 2 states? A) Hexadecimal. B) Binary. C) Decimal. D) ASCII. Show Answer Correct Answer: B) Binary. 24. Explain the concept of Boolean algebra in digital electronics. A) Boolean algebra is not applicable to digital circuits. B) Boolean algebra in digital electronics involves the manipulation of binary variables using logical operations like AND, OR, and NOT to simplify complex logic circuits and expressions. C) Boolean algebra is used for arithmetic calculations in digital electronics. D) Boolean algebra only involves addition and subtraction operations. Show Answer Correct Answer: B) Boolean algebra in digital electronics involves the manipulation of binary variables using logical operations like AND, OR, and NOT to simplify complex logic circuits and expressions. 25. Evaluate:name = "Andrew"name == "andrew" A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 26. $\overline{A}$ $\overline{B}$ A) B . A. B) $\overline{A.B}$. C) $\overline{A+B}$. D) A . B. Show Answer Correct Answer: C) $\overline{A+B}$. 27. Which of the following is a type of flip-flop? A) SR flip-flop. B) AND flip-flop. C) XOR flip-flop. D) NOR flip-flop. Show Answer Correct Answer: A) SR flip-flop. 28. Define the Boolean expression for a NOR gate. A) A' B'. B) (A + B)'. C) (A B)'. D) A' + B'. Show Answer Correct Answer: B) (A + B)'. 29. How many different combinations of 1 and 0 are possible with 1 bit? A) 3. B) 1. C) 2. D) 4. Show Answer Correct Answer: C) 2. 30. What is the result of the Boolean expression A + A'? A) 1. B) 0. C) A'. D) A. Show Answer Correct Answer: A) 1. 31. What is the output of a NAND gate when both inputs are 1? A) 0. B) 1. C) Undefined. D) None of the above. Show Answer Correct Answer: A) 0. 32. What does Boolean logic primarily use? A) True and False values. B) Decimal numbers. C) ASCII characters. D) Hexadecimal digits. Show Answer Correct Answer: A) True and False values. 33. For the AND Boolean operation, if one of the inputs is false, the output is ..... A) Undetermined. B) False. C) Negated. D) True. Show Answer Correct Answer: B) False. 34. The dual of the expression A + 0 = A is: A) A 0 = 0. B) A + 1 = A. C) A' + 0 = A'. D) A 1 = A. Show Answer Correct Answer: D) A 1 = A. 35. (NOT False) And (True) A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 36. According to Distributive law, A(B+C)= A) AB+AC. B) ABC. C) A+B+C. D) A+BC. Show Answer Correct Answer: A) AB+AC. 37. James is deciding whether to go outside. If it is not raining, he will go. In Boolean terms, what does the NOT operation do in this scenario? A) Represents a true statement. B) Negates a value. C) Checks equality. D) Combines two values. Show Answer Correct Answer: B) Negates a value. 38. DEMORGAN'S THEOREM STATES THAT ..... A) (A + B)' = A' * B. B) (AB)' = A' + B. C) A' + B' = A'B'. D) (AB)' = A' + B'. Show Answer Correct Answer: D) (AB)' = A' + B'. 39. Evaluate this Boolean expression:I am in Year 8 AND I am in Year 7 A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 40. He BCD code for the decimal number 9 is: A) 1000. B) 1001. C) 1010. D) 1111. Show Answer Correct Answer: B) 1001. 41. A unit which addes two inputs and a carry bit together A) Half Adder. B) Full Adder. C) All the above. D) None of the above. Show Answer Correct Answer: B) Full Adder. 42. True or False:AND gates output a 1 if both inputs are 0 A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 43. Current flows through a transistor, between electrodes, when electricity is applied to the ..... A) Output pin. B) Control wire. C) Logic table. D) Reciever gate. Show Answer Correct Answer: B) Control wire. 44. (Not True) OR ( (5 < 4) || (Not True) ) A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 45. Simplify the Boolean function x + (x'y) to a minimum number of literals. A) X+y. B) X'y'. C) Xy. D) 0. Show Answer Correct Answer: A) X+y. 46. The output of two input AND gate is high when A) Both inputs are low. B) Both inputs are high. C) Any one input is high. D) Only one input is high. Show Answer Correct Answer: B) Both inputs are high. 47. In boolean algebra A+1 = ..... A) 0. B) A. C) 1. D) A'. Show Answer Correct Answer: C) 1. 48. A 3-variable K-map consists of: A) 16. B) 4. C) 8. D) 5. Show Answer Correct Answer: C) 8. 49. What is the role of Karnaugh maps in simplifying Boolean expressions? A) Karnaugh maps are used to complicate Boolean expressions further. B) Karnaugh maps are only used for visual representation and not simplification of Boolean expressions. C) Karnaugh maps have no impact on simplifying Boolean expressions. D) Karnaugh maps help in identifying and eliminating redundant terms in Boolean expressions, leading to a more simplified form. Show Answer Correct Answer: D) Karnaugh maps help in identifying and eliminating redundant terms in Boolean expressions, leading to a more simplified form. 50. Another way to represent OFF or FALSE. (1 mark) A) 0. B) 1. C) All the above. D) None of the above. Show Answer Correct Answer: A) 0. 51. Which is the 1's complement of (01011001) ..... 2? A) 11111111. B) 10100111. C) 10100110. D) 01011000. Show Answer Correct Answer: C) 10100110. 52. What is the symbol for logical addition in Boolean Algebra? A) /. B) *. C) -. D) +. Show Answer Correct Answer: D) +. 53. Lily installs a security system in her house. The system uses a NOT gate to control the alarm. If the sensor input is true (meaning a door is open), what will be the output of the NOT gate to the alarm? A) True. B) False. C) Undefined. D) Both true and false. Show Answer Correct Answer: B) False. 54. Arjun is learning about how computers make decisions using Boolean Algebra. His teacher asks him:Which of the following is NOT a fundamental operation in Boolean Algebra? A) AND. B) OR. C) NOT. D) ADD. Show Answer Correct Answer: D) ADD. 55. In an XOR Gate if the input A is true and the input B is false the output will be ..... A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 56. The Boolean expression (X + Y).(X + Y') simplifies to A) Y. B) X'Y'. C) X. D) XY. Show Answer Correct Answer: C) X. 57. In a positive logic circuit A) Logic 0 and 1 represented by 0v (ground) and positive voltage (+VCC respectively ). B) Logic 0 and 1 represented by negative and positive voltages respectively. C) Logic 0 voltage level is higher than logic 1 voltage level. D) Logic 0 voltage level is lower than logic 1 voltage level. Show Answer Correct Answer: A) Logic 0 and 1 represented by 0v (ground) and positive voltage (+VCC respectively ). 58. Define the output of a NOT gate when input is 0. A) 0. B) 2. C) 1. D) Undefined. Show Answer Correct Answer: C) 1. 59. State the Boolean law that says A + 0 = A. A) Domination Law. B) Idempotent Law. C) Null Law. D) Identity Law. Show Answer Correct Answer: D) Identity Law. 60. What is a Boolean Operator? A) A value that contains a number. B) A value that contains a condition. C) A value that contains a boolean. D) A value that contains a string. Show Answer Correct Answer: B) A value that contains a condition. ← PreviousNext →Related QuizzesScience QuizzesClass 12 QuizzesClass 12 Computer Science Chapter 6 Boolean Algebra And Logic Gates Quiz 1Class 12 Computer Science Chapter 6 Boolean Algebra And Logic Gates Quiz 2Class 12 Computer Science Chapter 6 Boolean Algebra And Logic Gates Quiz 3Class 12 Computer Science Chapter 6 Boolean Algebra And Logic Gates Quiz 4Class 12 Computer Science Chapter 6 Boolean Algebra And Logic Gates Quiz 6Class 12 Computer Science Chapter 6 Boolean Algebra And Logic Gates Quiz 7Class 12 Computer Science Chapter 6 Boolean Algebra And Logic Gates Quiz 8Class 12 Computer Science Chapter 6 Boolean Algebra And Logic Gates Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books