### Computer Science - Digital Computer Electronics MCQs Part 4

1. The XOR gates are ideal for testing parity because even-parity words produce a _____ output and odd-parity words produce a _____ output

A.
low, high
B.
high, low
C.
odd, even
D.
even, odd
E.
None of the above

2. Which of the following is not true?

A.
0X0 = 0
B.
0 x 1 = 1
C.
1 x 0 = 0
D.
1 x 1 = 1
E.
None of the above

3. _____ has become the most widely used bipolar family.

A.
DTL
B.
TTL
C.
ECL
D.
MOS
E.
None of the above

4. The functional capacity of SSI devices is

A.
1 to 11 gates
B.
12 to 99 gates
C.
100 to 10,000 gates
D.
more than 10,000 gates
E.
None of the above

5. The master slave JK flip-flop is effectively a combination of

A.
an SR flip-flop and a T flip-flop
B.
an SR flip-flop and a D flip-flop
C.
a T flip-flop and a D flip-flop
D.
two T flip-flops
E.
None of the above

6. Conversion of 10110112 to it's decimal equivalent is

A. 8110
B. 9110
C. 10010
D. 20010
E. None of the above

7. The octal equivalent of decimal 324.987 is

A. 504.771
B. 640.781
C. 815.234
D. 90.987
E. None of the above

8. One way to simplify the sum-of-products equation is to use boolean algebra. Another way is the _____ map.

A. De Morgan
B. Standard
C. Schottky
D. Karnaugh
E. None of the above

9. With a JK master-slave flip-flop the master is cocked when the clock is _____ and the slave is triggered when the clock is _____

A. set, reset
B. race, no change
C. high, low
D. set, race
E. None of the above

10. The 7400 series, also called standard TTL, contains a variety of SSI and _____ chips that allow us to build all kinds of digital circuits and systems.

A. LSI
B. MSI
C. MOS
D. MOSFET
E. None of the above

11. Conversion of decimal number 9910 to hexadecimal number is

A. 6316
B. 816
C. 6116
D. 5016
E. None of the above

12. Conversion of binary number 11011001111110002 to hexadecimal number is

A. D8F816
B. A8B916
C. 78916
D. D9F816
E. None of the above

13. When the LOAD input of a buffer register is active, the input word is stored on the next positive _____ edge.

A. clock
B. pulse
C. register
D. transistor
E. None of the above

14. Addition of 1101011012, 1110111012, 0001111112, 1001011012, 1111101112 is

A. 10110101110102
B. 11110110000102
C. 10001010001012
D. 010010000000102
E. None of the above

15. A demultiplexer is also known as

A. data selector
B. data distributor
C. multiplexer
D. encoder
E. None of the above

16. Conversion of a octal number 638 to its decimal number is

A. 5110
B. 6110
C. 5710
D. 5310
E. None of the above

17. Binary means _____

A. Three
B. Four
C. Ten
D. Two
E. None of the above

18. For an input pulse train of clock period T, the delay produced by an n stage shift register is

A. (n-l)T
B. nT
C. (n+l)T
D. 2nT
E. None of the above

19. _____ is the fastest logic family; it's used in high-speed applications.

A. DTL
B. TTL
C. ECL
D. MOS
E. None of the above

20. Conversion of a hexadecimal number 6316 to binary number is

A. 11001112
B. 11000112
C. 1110112
D. 11001112
E. None of the above

21. Which function positive logic is equivalent to OR function in negative logic?

A. NOT
B. AND
C. OR
D. NOR
E. None of the above

22. Conversion of binary number 1011012 to its decimal number is

A. 4510
B. 4310
C. 4010
D. 4710
E. None of the above

23. FETs are used in linear ICs to:

A. increase input resistance
B. provide large resistances
C. increase device complexity
D. (a) and (b) above
E. None of the above

24. A flip-flop can store

A. one bit of data
B. two bits of data
C. three bits of data
D. any number of bits of data
E. None of the above

25. Which of the following is the first integrated logic family?

A. RTL
B. DTL
C. TTL
D. MOS
E. None of the above

26. A flip-flop is a _____ element that stores a binary digit as a low or high voltage.

A. chip
B. bus
C. I/O
D. memory
E. None of the above

27. Conversion of decimal number 8910 it's binary number equivalent is

A. 10110112
B. 11001112
C. 10110012
D. 100112
E. None of the above

28. An AND gate has 7 inputs. How many input word are in its truth table?

A. 64
B. 32
C. 16
D. 128
E. None of the above

29. When an inverter is placed between both inputs of an SR flip-flop, the resulting flip-flop is

A. JK flip-flop
B. D flip-flop
C. T flip-flop
D. Master slave JK flip-flop
E. None of the above

30. Arithmetic operation are coded in

A. Decision symbols
B. Input/Outpur(I/0)
C. Processing symbols
D. Terminal symbols
E. None of the above

31. Which of the following electronic component is not found in ordinary ICs?

A. diodes
B. resistors
C. transistors
D. inductors
E. None of the above

32. A shift register can be used for

A. parallel to serial conversion
B. serial to parallel conversion
C. digital delay line
D. All of the above
E. None of the above

33. Which of the following logic families use bipolar transistors?

A. TTL
B. GaAS
C. NMOS
D. CMOS
E. None of the above

34. Which of the following Boolean algebra rules is wrong?

A. 0 + A = A
B. 1 + A = 1
C. A + A = A
D. 1 . x = 1
E. None of the above

35. Conversion of an octal number 608 to binary number is

A. 1100002
B. 100112
C. 11001112
D. 11001102
E. None of the above

36. Conversion of binary number 11000112 to hexadecimal is

A. 6316
B. 5716
C. 4616
D. 4016
E. None of the above

37. Conversion of binary number 11000112 to its decimal number is

A. 2910
B. 9710
C. 9910
D. 9310
E. None of the above

38. Conversion of binary number 11000112 to an octal number is

A. 1408
B. 1438
C. 1478
D. 1498
E. None of the above

39. A preliminary guide for comparing the simplicity of logic circuits is to count the number of input _____ leads.

A. wire
B. bus
C. gate
D. All of the above
E. None of the above

40. An AND gate has 7 inputs, what is the only input word that produces a 1 output?

A. 0000000
B. 0001111
C. 1110000
D. 1111111
E. None of the above

41. Convert the 1000 0000 0000 1111 signed binary number to decimal number.

A. +15
B. -15
C. -30
D. +30
E. None of the above

42. The _____ is a sequence of instructions that tells the computer how to process the data.

A. data
B. program
C. controls
D. instruction
E. None of the above

43. The output of the following gate is 1 only if at least one of its inputs is 0.

A. AND gate
B. OR gate
C. NAND gate
D. NOR gate
E. None of the above

44. The highest decimal number that can be represented with 10 binary digits is

A. 1023
B. 1024
C. 512
D. All of the above
E. None of the above

45. The clock signals are used in sequential logic circuits

A. to tell the time of the day
B. to tell how much time has elapsed since the system was turned on
C. to carry serial data signals
D. to synchronize events in various parts of a system
E. None of the above

46. In boolean algebra, the overbar stands for the NOT operation, the plus sign stands for the _____ operation.

A. AND
B. OR
C. NAND
D. NOR
E. None of the above

47. The reduced form of the Boolean expression (A+B)(A+C) is:

A. AB+AC
B. A+B+C
C. AC+B
D. A+BC
E. None of the above

48. A full-adder adds _____ bits, and producing a SUM and a _____

A. 8, SUBTRACTION
B. 3, CARRY
C. 16, DIVIDE
D. All of the above
E. None of the above

49. The radix of the binary number is:

A. 3
B. 1
C. 2
D. 10
E. None of the above

50. An XOR gate recognizes only words with an _____ number of 1's.

A. even
B. odd
C. different
D. All of the above
E. None of the above