1. According to the property of minterm, how many combination will have value equal to 1 for K input variables?
a. 1
b. 2
c. 3
d. 4
Correct Answer: a
2. According to boolean law: A + 1 = ?
a. 1
b. A
c. 0
d. A’
Correct Answer: a
3. How many AND gates are required to realize Y = CD + EF + G?
a. 5
b. 2
c. 3
d. 4
Correct Answer: b
4. Total number of inputs in a half adder is
a. 3
b. 4
c. 1
d. 2
Correct Answer: d
5. How many types of sequential circuits are?
a. 5
b. 2
c. 3
d. 4
Correct Answer: b
6. How many select lines would be required for an 8-line-to-1-line multiplexer?
a. 8
b. 3
c. 2
d. 4
Correct Answer: b
7. The truth table for an S-R flip-flop has how many VALID entries?
a. 4
b. 2
c. 1
d. 3
Correct Answer: d
8. The NAND gate output will be low if the two inputs are
a. 10
b. o0
c. 11
d. o1
Correct Answer: c
9. There are ______ cells in a 4-variable K-map.
a. 16
b. 12
c. 18
d. 8
Correct Answer: a
10. How many truth table entries are necessary for a four-input circuit?
a. 12
b. 16
c. 4
d. 8
Correct Answer: b
11. Convert the hexadecimal number (1E2)16 to decimal:
a. 482
b. 484
c. 480
d. 483
Correct Answer: a
12. 1’s complement of 1011101 is
a. 100010
b. o101110
c. 1001101
d. 1100101
Correct Answer: a
13. Perform binary addition: 101101 + 011011 = ?
a. 1010100
b. 11010
c. 1001000
d. 101110
Correct Answer: c
14. The decimal equivalent of the octal number (645)8 is
a. 0
b. (501)10
c. 0
d. (450)10
Correct Answer: c
15. Exclusive-OR (XOR) logic gates can be constructed from what other logic gates?
a. 0
b. AND gates, OR gates, and NOT gates
c. 0
d. AND gates and NOT gates
Correct Answer: b
16. Don’t care conditions can be used for simplifying Boolean expressions in
a. 0
b. Registers
c. 0
d. Terms
Correct Answer: a
17. A variable on its own or in its complemented form is known as a
a. 0
b. Sum Term
c. 0
d. Word
Correct Answer: a
18. DeMorgan’s theorem states that
a. 0
b. (A + B)’ = A’ * B
c. 0
d. (AB)’ = A’ + B
Correct Answer: a
19. The largest two digit hexadecimal number is
a. 0
b. (FE)16
c. 0
d. (EF)16
Correct Answer: c
20. In binary number system digits range from?
a. 0
b. 0-1
c. 0
d. 0-8
Correct Answer: b
21. A flip flop stores
a. 0
b. 10 bit of information
c. 0
d. 3 bit of information
Correct Answer: a
22. How many AND, OR and EXOR gates are required for the configuration of full adder?
a. 0
b. 2, 1, 2
c. 0
d. 3,1,2
Correct Answer: b
23. The quantity of double word is
a. 0
b. 4 bits
c. 0
d. 32 bits
Correct Answer: d
24. If A and B are the inputs of a half adder, the sum is given by
a. 0
b. A XOR B
c. 0
d. A OR B
Correct Answer: b
25. In which operation carry is obtained?
a. 0
b. Addition
c. 0
d. Multipication
Correct Answer: b
26. Which input values will cause an AND logic gate to produce a HIGH output?
a. 0
b. At least one input is LOW
c. 0
d. All inputs are HIGH
Correct Answer: d
27. In boolean algebra, the OR operation is performed by which properties?
a. 0
b. All of the Mentioned
c. 0
d. Commutative properties
Correct Answer: b
28. Entries known as _______________ mapping.
a. 0
b. Straigth
c. 0
d. Boolean
Correct Answer: a
29. These logic gates are widely used in _______________ design and therefore are available in IC form.
a. 0
b. Sampling
c. 0
d. Digital
Correct Answer: d
30. The AND function can be used to ___________ and the OR function can be used to
a. 0
b. Detect, invert
c. 0
d. Disable,enable
Correct Answer: c
31. Each group of adjacent Minterms (group size in powers of twos) corresponds to a possible product term of the given
a. 0
b. Value
c. 0
d. Word
Correct Answer: a
32. The basic logic gate whose output is the complement of the input is the _
a. 0
b. XOR gate
c. 0
d. OR gates and NOT gates
Correct Answer: c
33. The sequential circuit is also called
a. 0
b. Adder
c. 0
d. Latch
Correct Answer: d
34. If we use an AND gate to inhibit a signal from passing one of the inputs must be
a. 0
b. LOW
c. 0
d. Inverted
Correct Answer: b
35. If the number of n selected input lines is equal to 2^m then it requires _____ select lines.
a. 0
b. m
c. 2
d. n
Correct Answer: b
36. The instruction used in a program for executing them is stored in the
a. 0
b. Microprocessor
c. 0
d. CPU
Correct Answer: c
37. It should be kept in mind that don’t care terms should be used along with the terms that are present in
a. 0
b. K-Map
c. 0
d. Expressions
Correct Answer: c
38. Any signed negative binary number is recognised by its
a. 0
b. LSB
c. 0
d. Nibble
Correct Answer: a
39. If the decimal number is a fraction then its binary equivalent is obtained by ________ the number continuously by 2.
a. 0
b. Multiplying
c. 0
d. Subtracting
Correct Answer: b
40. Using the transformation method you can realize any POS realization of OR-AND with only.
a. 0
b. NAND
c. 0
d. NOR
Correct Answer: d
41. A single transistor can be used to build which of the following digital logic gates?
a. 0
b. AND gate
c. 0
d. NAND gate
Correct Answer: a
42. The NOR gate output will be high if the two inputs are
a. 0
b. 10
c. 11
d. o0
Correct Answer: d
43. Perform binary subtraction: 101111 – 010101 = ?
a. 0
b. o11001
c. 0
d. 100100
Correct Answer: c
44. 2’s complement of 11001011 is
a. 0
b. o10101111
c. 1001101
d. 1100101
Correct Answer: a
45. The expression Y=(A+B)(B+C)(C+A) shows the _________ operation.
a. 0
b. NAND
c. 0
d. SOP
Correct Answer: c
46. A ROM is defined as
a. 0
b. Read One Memory
c. 0
d. Read Out Memory
Correct Answer: a
47. In a multiplexer, the selection of a particular input line is controlled by _
a. 0
b. Selected lines
c. 0
d. Logic gates
Correct Answer: b
48. The logical sum of two or more logical product terms is called
a. 0
b. NAND Operation
c. 0
d. POS
Correct Answer: c
49. The expression Y=AB+BC+AC shows the _________ operation.
a. 0
b. NOR
c. 0
d. POS
Correct Answer: c
50. The parameter through which 16 distinct values can be represented is known as
a. 0
b. Byte
c. 0
d. Word
Correct Answer: d