B.Sc. 1st Year 1st Sem Computer Science MOCK Test

 

B.Sc. 1^st Year 1^st Sem Computer Science and Computer Application Paper No. II

 DIGITAL ELECTRONICS Multiple Choice Questions (MCQ)

DIGITAL ELECTRONICS

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B.Sc. 1^st Year 1^st Sem Computer Science and Computer Application Paper No. II

 DIGITAL ELECTRONICS Multiple Choice Questions (MCQ)

MOCK TEST

DIGITAL ELECTRONICS

B.Sc. 1st Year 1st Sem Computer Science and Computer Application Paper No. II

Quiz

 

1. What does a decimal number represent?
   1.   Quality
   2.   Quantity
   3.   Position
   4.   None of these
2. Why the decimal number system is also called as positional number system
   1.   Since the values of the numbers are decided by multiplying the values
   2.   Since the values of the numbers are decided by the multiplying the values
   3.   Since the values of the numbers are decided by adding the values
   4.   Since the values of the numbers are decided by the position of the values
3. In binary numbers system a digit ranges form
   1.   0 to 9
   2.   0 to 1
   3.   0 to 15
   4.   0 to 7
4. How can you represent a decimal point
   1.   By a series of coefficients
   2.   By weight decided by its position
   3.   By location as well as base
   4.   None of these
5. A dight in base R will have a range from ……..
   1.   1 to R-9
   2.   0 to R- 1
   3.   1 to R+1
   4.   0 to R+1
6. Which method is used to convert a number form an October base to decimal base
   1.   Direct conversion method
   2.   Decimal equivalent method
   3.   Octal equivalent method
   4.   Positional notation method
7. In which conversion the product of number 16 raised by the location and then add all the products to get the final decimal values
   1.   Octal to decimal
   2.   Binary to decimal
   3.   Hexadecimal to decimal
   4.   None of these
8. Binary can be converted into equivalent octal numbers by making groups of three bits……...
   1.   Starting from the MSB
   2.   Starting from the LSB
   3.   Ending at the MSB
   4.   Ending at the LSB
9. The sign information has to be encoded along with the……….. to represent the integers completely
   1.   None of bits
   2.   Position
   3.   Magnitude
   4.   Weight
10. Which one is the possible technique for representing signed integers?
    1.   Signed Magnitude Representation
    2.   Diminished Radix-Compliment Representation
    3.   Radix-Complement Representation
    4.   All of the above
11. What is used to represent the signed magnitude
    1.   MSB
    2.   LSB
    3.   Both
    4.   None of these
12. In ………..to encode negative number, first the representation of its magnitude is taken complement each bit and add 1.
    1.   Signed integer representation
    2.   1’s complement representation
    3.   2’s complement representation
    4.   Radix complement representation
13. Which one of the following is the type of complement for each base R system?
    1.   Diminished radix-complement representation [(R-1)’s complement]
    2.   Radix-complement representation [R’s complement]
    3.   1’s and 2’s complement representation
    4.   Both [ a]and [b]
14. For subtraction of binary number subtract the……
    1.   Minuend form the subtraction digit
    2.   Subtrahend digit form the minuend
    3.   MSB form the LSB
    4.   None of these
15. Which of the following condition is true for determining overflow condition in 2’s complement?
    1.   When adding two positive numbers gives a negative result or when two negatives give a positive result.
    2.   If sign bit (MSB) of result and sign bit of two operands are of different sign.
    3.   The ‘1’ in the MSB position indicates a negative number after adding two positive numbers.
    4.   All of the above
16. Binary coded decimal or BCD is also known as……
    1.   2841
    2.   4821
    3.   4281
    4.   8421
17. What is the decimal representation of decimal number 5?
    1.   0000
    2.   1001
    3.   0011
    4.   0101
18. Which of the following code is also known as reflected code?
    1.   Excess -3 codes
    2.   Gary code
    3.   Straight binary code
    4.   Error code
19. Exor is the….. Of the binary number
    1.   MSB to the next bit
    2.   LSB to the next bit
    3.   MSB of the previous bit
    4.   LSB of the previous bit
20. ASCII code is representing more than …..characters
    1.   16
    2.   8
    3.   64
    4.   32
21. Logic high at the output is treated as gate ……..
    1.   On
    2.   Off
    3.   0
    4.   None of these
22. In digital electrical the on state is often represented by 1
    1.   O
    2.   1
    3.   2
    4.   3
23. The basic logic gates are not and …... …… and ……
    1.   OR
    2.   XOR
    3.   XNOR
    4.   All of these
24. The output of the not gate is always the…..of the input
    1.   Same
    2.   Negation
    3.   Opposite
    4.   Both [B] & [C]s
25. A basic and gate consists of ……. inputs and an output
    1.   One
    2.   Zero
    3.   Two
    4.   Ten
26. In the and gate the output of the
    1.   Fluctuating
    2.   Low
    3.   Medium
    4.   High
27. Symbol: f = A.B ‘.’where’.’implies …………operation.
    1.   OR
    2.   AND
    3.   XOR
    4.   NOR
28. A basic OR gate is two inputs, ………output gate.
    1.   Two
    2.   Infinity
    3.   Single
    4.   Zero
29. A basic OR gate is two inputs, ………output gate.
    1.   Two
    2.   Infinity
    3.   Single
    4.   Zero
30. The OR gate output is 0 only when both the inputs are
    1.   Minus
    2.   2
    3.   1
    4.   0
31. In addition to the NOT and OR and XOR gates ……. more common gates are available
    1.   Four
    2.   One
    3.   Two
    4.   There
32. For multi-input and NAND gates the unused input pin should not be left
    1.   On
    2.   Connected
    3.   Unconnected
    4.   None of these
33. Every valid Boolean expression [equality] remains valid if the operators and identity elements are interchanged
    1.   Distributive law
    2.   Complement
    3.   Duality principle
    4.   None of these
34. A……. is a table which consists of every possible combination of inputs and its corresponding outputs
    1.   Last table
    2.   Truth table
    3.   K- map
    4.   None of these
35. A variable on its own or in its complemented form is known as a-
    1.   Product term
    2.   Literal
    3.   Sum term
    4.   All of these
36. It is a single literal or a logical product [AND] of several liters
    1.   Sop
    2.   Pos
    3.   Literal
    4.   Product term
37. It is a sum term or a logical product [AND] of several sum terms
    1.   Sop
    2.   Pos
    3.   Minterm
    4.   Either [a] or [b]
38. Maxterm is the sum of…… of the corresponding Minterm with its literal complemented
    1.   Terms
    2.   Words
    3.   Numbers
    4.   None of these
39. Canonical form is a unique way of representing ……. Expressions
    1.   SOP
    2.   Minterm
    3.   Boolean
    4.   A page
40. Don’t care conditions can be used for simplifying Boolean expressions in
    1.   Examples
    2.   Terms
    3.   K-maps
    4.   Either [a] or [b]
41. It is a simple combination digital circuit-built form logical gate
    1.   Full adder
    2.   Half adder
    3.   Null adder
    4.   None of these
42. It is used to subtract two inputs having more than one bit
    1.   Full subtractor circuit
    2.   Half adder
    3.   Multiplexer
    4.   Counter
43. It is a circuit which subtract two inputs each one bit
    1.   Full subtractor
    2.   Full adder
    3.   Half subtractor
    4.   All of these
44. A code converter circuit converts the code of one form to another form
    1.   Encoder
    2.   Code converter
    3.   Decoder
    4.   Both [b] and [c]
45. It is a very useful combinational circuit used in communication systems
    1.   Parity bit checker
    2.   Parity bit generator
    3.   Parity bit
    4.   Both [a] and [b]
46. This converter deals with converter binary code to gray code
    1.   Binary to gray code convert
    2.   Gary to converter
    3.   Binary code convert
    4.   Gray convert code
47. It compares two n- bit values to determine whether one of them is grater or if they are equal
    1.   Calculator
    2.   Multiplexer
    3.   Comparator
    4.   None of these
48. It is a circuit which has a number of input lines and selection lines with one output line
    1.   Sequential circuit
    2.   Multiplexer
    3.   Counter
    4.   All of the above
49. It is circuit which can remember values for a long-time ort change values when required
    1.   Ripple
    2.   Counter
    3.   Circuit
    4.   Memory element
50. It is sequential circuit that cycles thorough a sequential of states
    1.   Multiplexer
    2.   Demultiplexer
    3.   Counter
    4.   Ripple
51. It is a country where the flip – flops do not change states at exactly the same time as they do not they have a common clock pulse
    1.   Asynchronous ripple counter
    2.   Counter
    3.   Synchronous ripple counter
    4.   All of these
52. It is a bi- directional counter capable of counting in either of the direction
    1.   Up synchronous counter
    2.   Down synchronous counter
    3.   Synchronous counter
    4.   Bot [a] and [b]
53. In this logic output depends not only on the current inputs but also on the past input values it needs some type of memory to remember the input values
    1.   Logical circuit
    2.   Sequential circuit
    3.   Connected circuit
    4.   Parallel circuit
54. It consists of two -level and -or circuits on a single chip
    1.   PLA
    2.   PAL
    3.   Alp
    4.   None of these
55. A digital communication system is used to transit massages which are in the …… form
    1.   Digital
    2.   Along
    3.   Both [A] & [B]
    4.   None of these
56. It contains an equal resistor or current source segment for each possible value of DAC output
    1.   Hybrid DAC
    2.   Binary weighted DAC
    3.   Segmented DAC
    4.   R-2R Ladder DAC
57. The total current can be converted into the currents voltage by using an
    1.   OP – AMP
    2.   Binary weighted ladder
    3.   Delta sigma DAC
    4.   Hybrid DAC
58. The number of resistors required for an -n bit DAC is 2n in the case of -
    1.   Weighted resistor type DAC
    2.   Segmented DAC
    3.   Binary weighted DAC
    4.   R- 2 R ladder DAC
59. The characteristic of a DAC which are generally specified by the manufactures
    1.   Linearity
    2.   Resolution
    3.   Accuracy
    4.   All of these
60. A counter with 10 sates
    1.   Cascading asynchronous counter
    2.   Decade counter
    3.   Asynchronous ripple counter
    4.   Ripple counter
61. In asynchronous ripple flip – flop …… and clear pin shows negation
    1.   Bubble at the rest
    2.   Active low present
    3.   Clear input
    4.   Active high present
62. It is a single input version of j- k flip – flop ……. Formed by typing both the inputs of
    1.   D flip – flop
    2.   S flip – flop
    3.   T flip – flop
    4.   n flip – flop
63. In flip – flop the ……. Arow shows positive transition on the clock
    1.   Upward
    2.   Downward
    3.   Vertical horizontal
    4.   Horizontal
64. Gated s- r latch is a combination of which latch and gate
    1.   J- K latch and nor gate
    2.   S-R latch and NAND gate
    3.   S- R latch and NOR gate
    4.   J-K latch and NAND gate
65. An n – bit register has a ground of n flip – flops some logic gates
    1.   Logic gates
    2.   Registers
    3.   Room
    4.   None of these
66. It does not have any external gate
    1.   Simple Register
    2.   buffers
    3.   Memory
    4.   Ram
67. A register can also be used to provide data movements
    1.   Parallel register
    2.   Simple register
    3.   Shift Register
    4.   All of the above
68. There are …... basic types of shift register
    1.   Six
    2.   Four
    3.   One
    4.   Many
69. This type of register accepts inputs data serially
    1.   PIPO
    2.   SIPO
    3.   PISO
    4.   SISO
70. This type of register accepts inputs data serially
    1.   PIPO
    2.   SIPO
    3.   PISO
    4.   SISO
71. This type of register accepts inputs data simultaneously and output is also coming out parallel
    1.   PIPO
    2.   SIPO
    3.   PISO
    4.   SISO
72. In this type of register data can be shifted in either right or left direction by using control signal
    1.   PIPO
    2.   SISO
    3.   Bi – directional shift register
    4.   None of these
73. In this type of counter, the complement of the output of the last stage of the shift register is fed back to the D input of the first state
    1.   Ring counter
    2.   Johnson counter
    3.   Straight counter
    4.   None of these
74. In this type of counter, the output of the last stage is connected to the D input of the first stage
    1.   Ring counter
    2.   Johnson counter
    3.   Straight counter
    4.   All of above
75. A device that exhibits two different stable states and function as a memory element in a binary system is known as……
    1.   Register
    2.   Flip- Flop
    3.   VLSI
    4.   Both [b] & [c]
76. The different types of flip – flop are……, …..and ……
    1.   R-S
    2.   D,T
    3.   J-K
    4.   All of these
77. The…. Latch is an asynchronous flip-flop which can be constructed form two MAND gates connected back-to-back
    1.   R-S
    2.   JK
    3.   SR NOR
    4.   None of these
78. Memory is a circuit which is used to store …..information
    1.   Accurate
    2.   Discrete
    3.   Along
    4.   Digital
79. Read only memory [rom] as the name suggests is meant only for …...information form it
    1.   Reading / writing
    2.   Writing
    3.   Reading
    4.   All the above
80. A can be programmed only once after which its contents are permanently fixed as room
    1.   PROM
    2.   Pram
    3.   SROM
    4.   None of these
81. a memory in which the information stored can be erased and new information is stored is called……
    1.   None – erasable memory
    2.   Erasable memory
    3.   Memory
    4.   Both [a] and [b]
82. Memory can be classified on the basic of the…... technology used
    1.   Non- fabrication
    2.   Bipolar
    3.   Fabrication
    4.   None of these
83. A row decoder decodes the ……location
    1.   Row
    2.   Column
    3.   Row/ column
    4.   None of these
84. In a sequential memory the words the words are stored in a sequence
    1.   Write
    2.   Read
    3.   Write /read
    4.   All of these
85. a…….is a semiconductor memory device used to store information which is permanent in nature
    1.   Last table
    2.   RAM
    3.   K- map
    4.   ROM
86. ROMs are well suited for the ……manufacturing processes
    1.   LSI
    2.   BSL
    3.   CLP
    4.   LSP
87. The EPROM eraser will emit…. light
    1.   Fluorescent
    2.   LED
    3.   LASER
    4.   UV
88. …. organization essential an array of selectively open and closed unidirectional contacts
    1.   ROM
    2.   RAM
    3.   COMPUTER
    4.   All of these
89. The EEPROM chip is physically similar to the chip
    1.   EPROPM
    2.   Minterm
    3.   POS
    4.   Either [a]or [b]
90. An n- bit register has a group of……. of flip -flops and some logic gates
    1.   N
    2.   P
    3.   10
    4.   0
91. A Register can also be used to provide …. movements
    1.   Bit
    2.   Data
    3.   Signal
    4.   None of these
92. A memory stores data for processing and the instructions for….
    1.   Results
    2.   Execution
    3.   Progress
    4.   All of these
93. Number of stored bits per unit area which determines overall storage capacity and memory cost per bit
    1.   Area efficiency
    2.   Access time
    3.   Power consumption
    4.   None of these
94. The chip select signal is applied to the…. Terminal
    1.   Chip
    2.   Last
    3.   CS
    4.   Either [a]OR [b]
95. The world to be stored is applied to the data…..terminal
    1.   Input
    2.   Output
    3.   Logic
    4.   None of these
96. The……of the desired memory location is applied to the addras input terminals
    1.   Name
    2.   Addras
    3.   Number
    4.   Level
97. A……command signal is applied to the write- control input terminal
    1.   Write
    2.   Read
    3.   Write/ read
    4.   Both [a] &[b]
98. A prom can be programed only once after which its contents are permanently fixed as….
    1.   Rom
    2.   Ram
    3.   Memory
    4.   Input Data
99. In a sequential memory the words are stored in and read out in as-
    1.   Parallel
    2.   Sequence
    3.   Length
    4.   None of these