COMA XI UNIT 1

Examination Name: COMA XI UNIT 1
Date: April 5, 2026
Time allowed: 90 minutes

1. 
The current number of bits in ASCII code is
2. 
The equivalent binary number of this Grey Code

(11011)2  will beDeselect Answer

3. 
How many gates are required to make a logic circuit for

f = x + ȳ z ?
A. 1
B. 2
C. 3
D. 4Deselect Answer

4. 
The octal form of the number

(101.11)2 will beDeselect Answer

5. 
The 2’s complement of

(1011)2 isDeselect Answer

6. 
Which of following is not an octal number?
7. 
In Boolean, minterms are combined by variables__________
8. 
The positional value of the LSD of the number

(547.26)8 will be

A. 6x82

B. 6x81

C. 6x8-1

D. 6x8-2

Deselect Answer

9. 
Which of the following codes can also be called Self Complementary Method?
10. 
Which is correct in

____
X + Y̅ = ? 
A. x̄.y 
B. x.ȳ 
C. x̄ + ȳ 
D. X̄.ȲDeselect Answer

11. 
What is the octal value of the decimal number
12. 
Simplifying

F = (A, B = Ā B̄ + A B̄) using K – Map gives the value of F
1) F = B̄
2) F = B
3) F = Ā.B̄
4) ABDeselect Answer

13. 
The positional value of 5 in the number

(257) 8 is

Deselect Answer

14. 
The number of rows in the truth table of a Boolean expression with 4 variables is
15. 
Which is correct?

Assertion: The rightmost bit of a binary number is called MSB
Reason: The rightmost digit has the lowest valueDeselect Answer

16. 
The XNOR is composed of the following gates:

i) AND
ii) OR
iii) NOT
Which of the following is correct?Deselect Answer

17. 
Find the correct answer

 The values of 20,80, 160 are

Deselect Answer

18. 
According to the Involution or Double Complement formula in Boolean algebra

1) Ā = Ā
2) Ā = A.A
3) Ā = Ā
4) None of theseDeselect Answer

19. 
The code used to express symbols in all languages worldwide is
20. 
Which gate does the equation A + A'B refer to?
21. 
Which is correct here?

X + X̄Y = 
A. X
B. Y
C. X+Y 
D. X̄+YDeselect Answer

22. 
A code prescribed for displaying the Indian alphabet is
23. 
11001111-what is the hexadecimal value of this number?
24. 
The BCD value of the number

(42)10 will beDeselect Answer

25. 
Which is correct?

f(A, B) = ∏(1, 2)=
A. (Ā + B̄) (A + B)
B. (A + B̄) (Ā + B)
C. (A + B̄) (Ā + B̄)
D. A + B̄ + BDeselect Answer

26. 
(X + Y)(X + Z) =
27. 
The output of AND gate is High (1) when
28. 
In binary,1+1+1=?
29. 
In K-Map,

the value of the 11th cell of a square of four variables is 1111, whose over all value or decimal value is

Deselect Answer

30. 
Using K-Map,

F(A,B,C) =Σ(m0 , m4) = Ā B̄ C̄ + A B̄ C̄ is simplified to give the value of F
1) B̄ C
2) B̄ C̄
3) B C̄
4) BDeselect Answer

31. 
The number

(10110)2 will be 1’s complement
A. 00101
B. 10111
C. 01001
D. 01010Deselect Answer

32. 
Which among these is correct?

 (56)8 = (?)10

Deselect Answer

33. 
Which is correct?

Assertion: 512,64,8,2 This is a positional value in a number system
Reason: Numbers are converted from binary to decimal number system using positional valueDeselect Answer

34. 
Which two of the following are Universal gates?
35. 
The value of D in hexadecimal number system is
36. 
Which is correct?

Assertion: The base of the hexadecimal number system is 16
Reason: The hexadecimal number system has 16 digits from 0 to FDeselect Answer

37. 
The equivalent decimal number of the number

(1011.11)2  will beDeselect Answer

38. 
This will be the Grey Code of the binary number

(11011)2Deselect Answer

39. 
What will be the output of an XNOR gate with two inputs A and B?

1) AB
2) Ā.B̄ + AB
3) AB̄ + ĀB
4) A + BDeselect Answer

40. 
The sum of 4 bits is
41. 
The highest number in the octal system _________ _ is and the lowest number is __________
42. 
The hexadecimal form of the number

(245)10 will beDeselect Answer

43. 
Which of the following is not a basic gate?
44. 
The value of x here

(24)8 + (x)10 = (32)10 will beDeselect Answer

45. 
The MSB and LSB of the number

 (101101010)2 are respectively

Deselect Answer

46. 
The minimum number of variables in this logic expression

F = Σ (0,2,5) isDeselect Answer

47. 
What is the BCD value of the decimal number 473?
48. 
How many NOR gates are needed to make an OR gate from a NOR gate?
49. 
In Boolean x (x+y) =
50. 
The positional value of 5 in the number 537 is
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