JEE Main - Basic logic gates and simple electronic circuits One Line Questions & Answers

1. A NOT gate has an input of 0. What is its output? — 1

2. An XOR gate with inputs 1 and 0 will produce an output of: — 1

3. An XNOR gate with inputs 1 and 1 will produce an output of: — 1

4. The output of a NAND gate with inputs 1 and 0 is: — 1

5. The output of a NOR gate with inputs 0 and 0 is: — 1

6. How many select lines are needed for a 4-to-1 multiplexer? — 2

7. A 1-to-8 demultiplexer requires how many select lines? — 3

8. A 3-to-8 decoder has: — 3 input lines and 8 output lines

9. A decade counter counts from 0 to: — 9

10. The Boolean expression for an OR gate with inputs A and B is: — A + B

11. The Boolean expression for an AND gate with inputs A and B is: — A . B

12. What is a counter in digital electronics? — A circuit that generates a sequence of binary numbers

13. What is a flip-flop? — A sequential logic circuit used for memory storage

14. A NOR gate has an output of 1. What must be true about its inputs? — All inputs are 0

15. Which of the following is NOT a fundamental logic gate? — NAND

16. A half-adder circuit typically uses which logic gates? — XOR and AND gates

17. Which logic gate produces an output of 0 if any of its inputs is 1? — NAND gate

18. Which logic gate has an output that is the inverse of its input? — NOT gate

19. Which logic gate produces an output of 1 if the inputs are different? — XOR gate

20. Which logic gate is represented by the symbol '+' in Boolean algebra? — OR gate

21. If a digital circuit's output is 1 only when an odd number of inputs are 1, what type of gate is it? — XOR gate

22. Which logic gate's truth table has output 1 for all input combinations except when all inputs are 1? — NAND gate

23. The output of an OR gate is 0. What can be said about its inputs? — All inputs are 0

24. How can a NOT gate be constructed using only NAND gates? — Connect both inputs of a NAND gate together

25. In a synchronous counter, all flip-flops change state: — Simultaneously, triggered by a common clock pulse

26. What is the characteristic property of a semiconductor diode used in simple electronic circuits? — It allows current to flow only in one direction

27. A NOR gate is considered a universal gate because: — It can be used to implement AND, OR, and NOT gates

28. Which logic gate produces an output of 1 only if all its inputs are 1? — AND gate

29. Which logic gate is equivalent to a series of AND gate followed by a NOT gate? — NAND gate

30. Which of the following is a universal gate, meaning any other logic gate can be constructed using only this type of gate? — NAND gate

31. Which logic gate is represented by the symbol '•' in Boolean algebra? — AND gate

32. A D flip-flop is also known as a: — Delay flip-flop

33. What is the primary application of basic logic gates? — Implementing digital logic functions

34. Which type of flip-flop is sensitive to the clock edge and has no race-around condition? — Master-Slave JK flip-flop

35. A shift register can: — All of the above

36. What is the output of a half-adder when the inputs are A=1 and B=0? — Sum=1, Carry=0

37. What is the output of a half-adder when the inputs are A=1 and B=1? — Sum=0, Carry=1

38. A ripple counter is also known as a: — Asynchronous counter

39. What is the function of a full-adder circuit? — To add three 1-bit binary numbers (including a carry-in) and produce a sum and a carry-out

40. What is the function of a half-adder circuit? — To add two 1-bit binary numbers and produce a sum and a carry

41. What is the function of an encoder? — To convert multiple inputs into a binary code

42. What is the function of a decoder? — To convert binary code into a specific output line

43. What is the primary function of a register? — To store a group of bits

44. What is the function of a multiplexer (MUX)? — To select one of several input lines and route it to a single output line

45. What is the function of a demultiplexer (DEMUX)? — To route a single input line to one of several output lines, based on select inputs

46. A simple electronic circuit that performs a specific logical operation is called a: — Logic gate

47. A priority encoder generates an output corresponding to the highest priority input that is active. — True, it prioritizes inputs automatically

48. A full-adder can be constructed using: — Two half-adders and an OR gate

49. How can an AND gate be constructed using only NOR gates? — A NOR gate followed by a NOT gate (constructed from NOR gates)

50. Which logic gate produces an output of 0 if the inputs are the same? — XNOR gate

Basic logic gates and simple electronic circuits - One Line Questions