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Flashcards

Comp sci All topics part 1

daniel upton English 195 cards

Comp sci All topics part 1

Cards in this deck (195)

  1. 1What does a not gate look like and what are it's outputsWhat does a not gate look like and what are it's outputs
  2. 2What does an And gate look like and what are it's outputsWhat does an And gate look like and what are it's outputs
  3. 3What does an Or gate look like and what are it's outputs?What does an Or gate look like and what are it's outputs?
  4. 4What does an Xor gate look like and what are it's outputs?What does an Xor gate look like and what are it's outputs?
  5. 5What does a Nand gate look like and what are it's outputsWhat does a Nand gate look like and what are it's outputs
  6. 6What does a Nor gate look like like and what are it's outputs?What does a Nor gate look like like and what are it's outputs?
  7. 7Why is Nand the universal gate?As it combines two gates in a single gate, different combinations can be used to recreate other gates
  8. 8Define HardwareHardware is the mechanical and electrical components of a computer
  9. 9Define SoftwareSoftware are the programs on the computer
  10. 10Define system softwareA program that manages the operation of the computer
  11. 11What is the role of an operating system?To manage the hardware resources in order to provide for an orderly and controlled allocation of the programs, memories and I/O devices among the various programs competing for them and manage the storage of data. It also hides the complexities of the hardware
  12. 12Define utility softwareUtility software is programs that assist with the running of a computer
  13. 13Define a LibraryA library is a collection of pre-compiled routines that can be used by other programs
  14. 14What is representational abstraction?representation arrived at by removing unnecessary details
  15. 15What is Abstraction by generalisation/categorisation?grouping by common characteristics to arrive at a hierarchical relationship of the 'is a kind of' type.
  16. 16What is procedural abstraction?The result of abstracting away the actual values used in a procedure
  17. 17What is functional abstraction?abstracting the values and the computational method.
  18. 18What is procedural decomposition?Dividing a problem into individual sub problems
  19. 19What is composition abstraction?combining procedures to form compound procedures
  20. 20What is data abstraction?combining data objects to from compound data
  21. 21Define application softwarecomputer software designed to perform a group of coordinated functions, tasks or activities for the benefit of the user
  22. 22What is a program counter?A program Counter is a register in a processor that contains the address of the instruction being executed at that time
  23. 23What is a memory buffer register?A register that stores the data being transferred ti and from the immediate access store
  24. 24What is the fetch execute cycle?1. Address of next instruction transferred from PC to MAR
    2. PC incremented by 1
    3.Instruction stored in location addressed by MAR is transferred to MBR
    4.Instruction transferred from MBR to CIR
    5.Instruction in CIR is decoded
    6.Additional data if required by the instruction is fetched from memory and passed to the registers
    7.Instruction is executed by the ALU
    8.Registers are used to store intermediate data or results
    9.The result is stored in the accumulator or general purpose register or memory
  25. 25Define opcodeThe basic machine operation and the addressing code
  26. 26Define operandThe data or the address of the data depending on addressing mode
  27. 27What is the difference between immediate and direct addressing?Immediate is where the operand is the bit of data whilst in direct the operand is the location of the data.
  28. 28Define Baud rateBaud rate is how many times a signal can change a second
  29. 29Define bit rateHow many bits can be sent per unit time
  30. 30Define data typeThe specific category of data for a piece of data
  31. 31Define the following data types an integer, a real/float, Boolean, character, string, date/time, records and arraysInteger is a whole number.
    real/float is a decimal number
    Boolean is two states true or false
    character is a letter or symbol
    string is multiple characters
    date/time is date/time
    records is a piece of data in a table
    array is a store of pieces of data
  32. 32What is a variable?A value that is changed by the code when ran
  33. 33What is a constant?A value that isn't changed by the code when ran
  34. 34What is assignment?Setting one thing equal another
  35. 35What is iteration?Repeating through something for a certain amount of times or until a criteria is met
  36. 36What is selection?running something if a criteria is met
  37. 37What is a function and a procedure?A function is a group of code that returns a value a procedure doesn't have to
  38. 38How do you generate a random number in python?random.randint(x,y)
  39. 39What are local variables And what are the properties of them?Local variables are variables created within function. They exist only while the subroutine is executing and is only accessible only within the subroutine
  40. 40How do you read/write from/to a text file?open(r"File_Name","Access_Mode")
  41. 41Define an algorithmA sequence of steps that can be followed to complete a task and that always terminates
  42. 42Define natural numbersPositive integers including 0
  43. 43Define an integerA whole number
  44. 44Define Rational numbersAny number that can be represented by a fraction of two integers
  45. 45What is an irrational number?A number that can't be written as a fraction
  46. 46What is a Real number?Any number
  47. 47What are ordinal numbers?A number that describes a position
  48. 48What is base 10?A number system that each slot uses a range of 10 different values. E.g. decimal
  49. 49What is base 2?A number system that each slot uses a range of 2 different values. E.g. Binary
  50. 50What is base 16?A number system that each slot uses a range of 16 different values. E.g. Hexadecimal
  51. 51Convert 10110010 into decimal and hexadecimaldecimal = 128 + 32 + 16 + 2 = 178
    Hex = First part = 8 + 2 + 1 = B
    Second part = 2 = 2
    = B2
  52. 52Convert 124 into binary and Hexadecimal124 - 64 = 60 60 - 32 = 28 28 - 16 = 12 12-8 =4 4-4 =0
    01111100
    124 / 16 = 7 remainder 12 12 = C
    = 7C
  53. 53Convert A4 into binary and decimalA = 10 10 - 8 = 2 2 - 2 = 0
    4 - 4 = 0
    A4 = 10100100
    A = 10 10*16 = 160
    4*1 = 4
    160 + 4 = 164
  54. 54What is a byte?8 bits
  55. 55How many bytes are in KiB, KB, MiB, MB, GiB, GB, TiB, TB?KiB = 1024
    KB = 1000
    MiB = 1024 * 1024
    MB = 1000 * 1000
    GiB 1024 * 1024 * 1024
    GB 1000 * 1000 * 1000
    TiB 1024 * 1024 * 1024* 1024
    TB 1000 * 1000 * 1000 * 1000
  56. 56What's the difference between signed and unsigned binarySigned uses a bit at the beginning to decide whether the number is positive or negative
  57. 57What are the minimum and maximum values for unsigned binary given n bits?0 and 2^(n) -1
  58. 58Add the two unsigned binary integers 01101011 and 0111010101101011
    + 01110101
    = 11100000
  59. 59Multiply the two unsigned binary numbers 10110 and 11010110
    110
    10 * 10110 = 101100
    100 * 10110 = 1011000
    10000100
  60. 60Convert the two's compliment binary number 10110101 into decimal-128 + 32 + 16 + 4 + 1 = -75
  61. 61subtract 24 from 63 using two's compliment binary63 -24 = 63 +(-24) = 39
    63 = 0111111
    -24 = 1101000
    (1)0100111
    Remove carry bit as it is overflow
    0100111 =
    32 + 4 + 2 + 1 = 39
  62. 62convert 14.675 to 8 bit fixed point binary1110.1010
  63. 63What does ASCII stand for?American Standard Code for Information Interchange
  64. 64What is ASCII?ASCII is a binary representation of characters
  65. 65What is the difference between ASCII and unicode?Unicode uses 16 bits whilst ASCII uses 8
  66. 66What are the advantages of unicode over ASCII?Since unicode has more bits more characters can be represented. This has lead to characters from others languages to be represented in unicode
  67. 67Name four different types of error checking and correctionParity bits
    majority voting
    check digits
    checksums
  68. 68What are the two types of protocol used in parity bit checking?Odd parity and even parity
  69. 69How does parity bit error checking work?One bit in the byte of data sent is the parity bit. this dictates the total number of 1's and 0's in the byte. If even parity is used then the parity bit will be used to make sure there is an even number of 1's and 0's.
    If odd parity is used then the parity bit will be used to make sure there is an odd number of 1's and 0's
  70. 70How does majority voting work?The byte is sent 3 times then each bit is checked against the other two and the most common occurrence for each bit is selected
  71. 71Define a subroutineA named 'out of line' block of code that may be executed by simply writing it's name in a program
  72. 72What are the advantages of subroutines?Reduces duplication of code
    Code can be reused in multiple programs
    improves readability of code
    Improves trace ability and shortens time to bug fix
  73. 73Describe the use of parameters to pass data within the programParameters are values that are inserted into a subroutine which the subroutine can then act upon
  74. 74How do you return a value in a subroutineRETURN variablename
  75. 75Explain how a stack frame is used with subroutine calls to store return addresses, parameters and local variablesEach is inserted into the stack while the subroutine is running. When the subroutine is done the local variable values can be retrieved from the call stack if the subroutine is returned to. Parameters are held on the call stack to allow subroutines that require them to work properly once returned to. The return address is the location where the program will return to after the subroutine has finished. This is stored on the call stack so when the subroutine is done it returns to the correct place in the code
  76. 76Define recursionRecursion is where a subroutine calls itself within the subroutine
  77. 77What is a class?A class defines methods and attribute fields that capture the common behaviours and characteristics of objects
  78. 78What is an object?An instance of a class
  79. 79What is instantiation?Instantiation is the creation of an instance of a class
  80. 80Define encapsulationEncapsulation is attributes and methods being in a single entity
  81. 81what is inheritance?Gaining attributes and methods from a superclass to be used in a subclass
  82. 82Define aggregation associationEntity b exists without entity a
  83. 83Define composition aggregationentity b has no meaning to the system without entity a
  84. 84What is the symbol for composition?A filled diamond with a solid line
  85. 85What is the symbol for aggregation?An unfilled diamond with a solid line
  86. 86Define PolymorphismPolymorphism is when a method in a class hierarchy behave differently in each class
  87. 87What is overriding?Overriding is when a sub class creates it's own version of a method from a superclass
  88. 88Why is composition favoured over inheritanceIn java you can't do multiple inheritance. Inheritance breaks encapsulation
  89. 89How do you read from a 2-D array?vertically then horizontally
  90. 90Name all the ADT'sQueue
    stack
    graph
    tree
    hash table
    dictionary
    vector
  91. 91What is the difference between a static and a dynamic data structureA static data structure has a fixed sized whilst a dynamic data structure has a varying size
  92. 92What are the advantages and disadvantages of static and dynamic data structuresNo oversight is needed for static as the memory size is fixed so there will be no overflow or underflow issues
    Static is easier to program
    Dynamic is more memory efficient as it takes up only the required amount of data needed, this also means the programmer can control the amount of memory used
  93. 93In a queue how do you add an item, remove an item, test for an empty queue and a full queueenqueue() inserts an element to the end of a queue
    dequeue() removes and returns the first element of the queue
    isEmpty() return true if the queue is empty
    isFull() return true if the queue is full
  94. 94In a stack how do you do the following operations do? Push, pop, peek or top, test for empty stack and a full stackPop() Removes and returns the top element of the stack
    Push() Inserts an element at one the top of the stack
    peek() returns the element at the top of the stack without removing it
    isEmpty() return true if the stack is empty
    isFull() return true if the stack is full
  95. 95What are the uses of graphs and give 3 examplesTo show the flow of computation
    Google maps uses weighted graphs to work out shortest paths where intersections are vertices and edges are roads
    Facebook users are considered vertices and if two users are friends then there is an edge between them. This is used in the suggest a friend algorithm
    In the operating system there is the resource allocation graph where the
    resources and process are vertices and the edges are from resources to allocated processes
  96. 96Define a graphA graph is a non-linear data structure, which consists of vertices connected by edges where edges may be directed or un-directed
  97. 97Define a weighted graphA weighted graph is a graph where the edges have values
  98. 98Define a vertexIs a node within the graph
  99. 99Define an edgeAn edge connects vertices in a graph
  100. 100What is an un-directed graph?A graph where the edges have no direction and therefore the graph can be traversed in any direction.
  101. 101What is a directed graph?A directed graph is where the edges have a specific direction and can only be traversed in a specific direction
  102. 102What is an adjacency matrix?An adjacency matrix is a representation of which vertices are connected by edges. if the graph is weighted then the weight of each path is also shown
  103. 103What is an adjacency list?An adjacency list is a list for each vertex that display each connected vertex and the values of the edge if the graph is weighted
  104. 104Define a treeA tree is a connected undirected graph with no cycles
  105. 105What is a rooted tree?A tree with a vertex designated as the root. All other vertices have a parent-child relationships between nodes. The root is the only vertex with no parent and all other nodes are descendants of the root.
  106. 106What is a binary tree?A tree where each vertex has a maximum two children
  107. 107What are typical uses for a rooted tree?A binary tree can be used as a binary search tree
    Family tree
    organisation hierarchy tree
  108. 108Define a hash tableA hash table is a data structure that creates a mapping between keys and values
  109. 109What are the uses of a hashing table?As a database
    As caches to speed up the access to data
  110. 110Using mod 6 store the following values into the hash table: 24, 37, 41, 8, 15, 640 : 24
    1 : 37
    2 : 8
    3 : 15
    4 : 64
    5 : 41
  111. 111In a hash table when does a collision occur?A collision occurs when two key values compute to the same hash
  112. 112What is a dictionary?A collection of key-value pairs in which the value is accessed via the associated key
  113. 113What is the use of a dictionary?information retrieval
  114. 114In terms of vectors what does R^4 mean?4-vector over R meaning a vector with 4 different components
  115. 115In vectors what does f : S → R mean?The function f maps S to R
  116. 116Represent the following as a dictionary and a list • 0 ↦ 2.0 • 1 ↦ 3.14159 • 2 ↦ -1.0 • 3 ↦ 2.718281828Dictionary: {0:2.0, 1:3.14159, 2:-1.0, 3:2.718281828}
    List [2.0, 3.14159, -1.0, 2.718281828]
  117. 117Represent the following as a 1-D array [6, -2, 4]X Y Z
    6 -2 4
  118. 118Calculate the following [2.3, 8.6] + [5.9, 3.4] [2.1, 3.4] * 2[8.2, 12]
    [4.2, 6.8]
  119. 119what is the equations for convex combination of two vectors and what does each letter mean?αu + βv
    Where :
    u and v are two vectors
    α and β >= 1
    α + β = 1
  120. 120Do the dot or scalar product of the following vectors: [6, 2] [3, 4]6*3 =18
    2*4 = 8
    18+8 = 26
  121. 121Name an application of dot productFinding the angle between two vectors
  122. 122Give an application of depth and breadth first traversalBreadth first: the shortest path for an unweighted graph
    Depth first: Navigating a maze
  123. 123Traverse the following tree using depth first and breadth first traversal. tree ---- j <-- root / \ f k / \ \ a h z \ dbreadth first = [j, f, k, a, h, z, d]
    depth first = [j, f, a, f, h, k, z]
  124. 124Traverse the following tree using pre-order in order and post order tree ---- j <-- root / \ f k / \ \ a h z \ dpre-order :[j, f, a, d, h, k, z]
    in order: [a, d, f, h, j, k, z]
    post- order : [d, a, h, f, z, k, j]
  125. 125What are the uses of pre, in and post order traversals?pre order is used to for copying a tree
    in order is used in a binary search tree to output the contents in ascending order
    post order is used for infix to reverse polish notation conversions, producing a postfix expression from an expression tree, emptying a tree
  126. 126Convert (2+4) * 6 + 8 into reverse polish notation24+6*8+
  127. 127Convert 728+*64/- into infix notation7*(2+8)-6/4
  128. 128Why is reverse polish used?It eliminates need for brackets in sub-expressions. Expressions in a form suitable for evaluation using a stack
  129. 129Where is reverse polish notation used?Giving two examples.Its used in interpreters based on a stack for example postscript and bytecode
  130. 130What is the time complexity of a linear search?O(n)
  131. 131How does a linear search algorithm work?Going through every item to find the correct one
  132. 132What is the time complexity of the binary search algorithm?O(log n)
  133. 133How does a binary search algorithm work?First the data has to be ordered. It checks the middle piece of data to see if the target data is greater than or less than this piece of data. It then changes it's parameters to be searching within the area that the target data is in. This process is repeated until the target piece of data is found
  134. 134How does a binary tree algorithm work?It looks at the root of the tree to see if the target piece is greater than or less than the root. It then moves to the side where the target piece of data is in and repeats the process until the target piece of data is found.
  135. 135What is the time complexity of the bubble sort algorithm?n^2
  136. 136How does a bubble sort algorithm work?It compares two adjacent items of data if one is greater than the other they are swapped this then continues until it reaches the end of the array. When the end on the array is reached this means the right most piece of data is sorted. this continues until all the data pieces are sorted
  137. 137How does a merge sort algorithm work?splitting up the data into pairs then sorting the pairs on which is greater. Then the pairs are merged with another pair and is sorted on which one is the greatest. Then these are merged together and sorted until the entire data collection is back together.
  138. 138How does Dijkstra's shortest path algorithm work?Going from a start node to a goal node each node with the shortest distance is visited. Each node apart from the initial starts with a values of infinity and is replaced with a different value if a path is found that has a lower combined value. When a node is visited it is added tho the visited list. The initial node starts with a value of 0. this continues until the goal node is reached and the lowest value to that path is set as its value.
  139. 139What is information hiding?Hiding all the details of an object that do not contribute to it's essential characteristics
  140. 140What is problem abstraction/reduction?Removing details until the problem is represented in a way that is possible to solve, because the problem reduces to one that has already been solved
  141. 141What is automation?Putting models into action to solve problems
  142. 142How is automation achieved?Creating algorithms
    implementing the algorithms in program code
    implementing the models in data structures
    executing the code
  143. 143What is the difference between an FSM and a Mealy machine.Mealy machine has outputs
  144. 144Define a setA set is an unordered collection of values in which each value occurs at most once
  145. 145What symbols denote a set?{}
  146. 146What does | mean in set notationsuch that
  147. 147Write the following numbers in a set using notation and set comprehension. 4, 1, 5, 2, 3A = {4, 1, 5, 2, 3}
    A = {a | a ∈ N ^ a >= 1 ^ a <= 5}
  148. 148What does ^ mean in set notation?and
  149. 149What does ∈ mean?is a member of
  150. 150What sets are denoted by the following letters : ℕ, Z, Q and RN = natural numbers e.g. positive integers
    Z = Integers
    Q = Rational e.g. any number that can be defined by a fraction of two integers
    R = Any number
  151. 151What are the symbols for an empty set?{} or Ø
  152. 152Write out the first three binary results of these compact string representations. {0(power)n 1(power)n| n>=1} {(01)(power)n| n>=1 ^ n≠3 } {01(power)n | n>=2}{01, 0011, 000111}
    {01 , 0101, 01010101}
    {011, 0111, 01111}
  153. 153What is a finite set?A set where the elements can be counted using natural numbers and has an end e.g. 1st element 2nd element ..... 20th( and final element
  154. 154What is a infinite set?A set that goes on infinitely e.g. The set of natural numbers, ℕ and the set of real
    numbers, ℝ
  155. 155What is a countably infinite set?An infinite set that can be counted by natural numbers
  156. 156What is the cardinality of a finite set?The number of elements in a finite set
  157. 157What is the cartesian product of sets?The set of all ordered pairs e.g. (a,b) where a is a member of set A and b is a member of set B
  158. 158What does subset mean?A subset is where all the elements in set A are in set B
  159. 159What does proper subset mean?A subset where all the elements in set A are in set B but there is at least one element is set B that isn't in set A
  160. 160What is a countable set mean?A set with the same carnality as some subset of natural numbers
  161. 161What are the symbols for subset and proper subset?subset = ⊆
    Proper subset = ⊂
  162. 162What do the following terms mean in terms of set intersection : A ∈ B , A ∪ B, A ∩ B and A\BA ∈ B = A is in set B
    A ∪ B = All the elements unique in set A and set B
    A ∩ B = All the elements that in both set A and B
    A\B = All the elements that are in set A but not set B
  163. 163What do the following metacharacters mean in terms of Regular expression? *, +, ? and |* = 0 or more
    + = 1 or more
    ? = 0 or 1
    | = or
  164. 164Describe the following Regular expression a(a|b)*1 a followed by any amount of a's and b's
  165. 165Define a regular languageAny language that can be represented by regular expression or an FSM
  166. 166Which of the following are accepted by the BNF of | 1. A2B 2. ABB 3. 2a2 4. 224 5. q661.yes
    2.no
    3. no
    4. no
    5. yes
  167. 167Explain why BNF can represent some languages that can't be represented using regular expressionsBNF can represent a wider range of languages because it is much easier to define languages and takes less time. As well regular languages can't describe nested brackets
  168. 168How can two algorithms be compared?Expressing their complexity as a function relative to the size of the problem
  169. 169What are the two factors that effect the efficiency of an algorithmTime and space
  170. 170Define a functionA function is a mapping from one set of values, the domain, to another set of values, the co-domain.
  171. 171Give an example of a linear, polynomial, exponential and logarithmic function.K is just a constant
    linear y = Kx
    polynomial y = kx^k
    exponential y = k^x
    logarithmic y = log x
  172. 172Give the time complexity in Big O notation of the following algorithms 1. n^2 + 4n 2. 8^n 3. n 4. 3 5. log n1. O(n^2)
    2.O(8^n)
    3.O(n)
    4.O(3)
    5.O(log n)
  173. 173Sort the following in order of time complexity from worst to best. Constant Exponential linear logarithmic polynomial1. Exponential
    2. polynomial
    3. Linear
    4. Logarithmic
    5. Constant
  174. 174Define tractable and intractable problemstractable are problems that has a polynomial or less time solution
    intractable are problems that don't have a polynomial or less time solution
  175. 175Describe the Halting problemThe halting problem is determining whether a program will stop if given an input
  176. 176What is the structure of a Turing machine?A tape divided into cells, one next to the other. Each cell contains a symbol from some finite alphabet. A head that can read and write symbols on the tape and move the tape left and right one (and only one) cell at a time. A state register that stores the state of the Turing machine. A finite table of instructions
  177. 177What is the importance of a Turing machine?Turing machine provide a general model of computation and provide a definition of what is computable
  178. 178Why are fixed point and floating point binary sometimes inaccurate?They can only go to a certain degree of accuracy as they can only represent some numbers
  179. 179How do you calculate the absolute and relative error between a number and it's fixed/ floating binary equivalent?Absolute :
    fixed/floating number - actual number
    Relative :
    Absolute error/actual number
  180. 180What are the advantages of and disadvantages of fixed point binary compared to floating point binary?fixed has a lower range and is generally less precise however it is quicker to calculate
  181. 181Normalise the following binary number with a 5 bit mantissa and a 3 bit exponent 11011001001 = 1
    move floating point one to the right so that number start with 10
    since we moved the point one to the right we minus 1 off the exponent
    1-1 = 0
    new exponent = 0 = 000
    mantissa = 10110
    new binary number = 10110000
  182. 182Explain underflow and overflow errors and explain when they occurAn underflow error is when a number is represented in binary it's lower than the actual value. An overflow error is when a number is represented in binary it's value is lower than the actual value. These occur when the number is a value that can't be represented in binary using either floating or fixed point so the number closest is used instead
  183. 183Explain how a check digit is used for verification on a barcodeAdd all the numbers up on the barcode except for the check digit(the far most right digit)
    Add up all the numbers in the odd positions, then double it and add it to the the previous calculation
    Subtract the last digit from the calculation from 10. the difference should be the check digit
  184. 184How do checksums work?The data value is added up and a divisor is chosen. The data value is divided by the divisor and the remainder is taken and sent with the data. The recipient then does the same calculation do see if they get the same remainder
  185. 185Describe how bit patterns may represent other forms of data.The computer converts the form of media into a binary representation this is called a bit pattern. Different amount of bits are allocated depending on how much variation there is in the data
  186. 186Whats the difference between analogue and digital data?analogue is the data is its natural form while digital is it's encoded form
  187. 187Whats the difference between analogue and digital signals?Analogue signals are the signals in their natural form whilst digital is the signal encoded.
  188. 188Describe how an analogue to digital converter worksAn analogue to digital converter samples the analogue signal on each falling or rising edge of a sample clock. In each cycle, the ADC gets the analogue signal, measures and converts it into a digital value. The ADC converts the output data into a series of digital values
  189. 189Describe how a digital to analogue converter worksThe DAC converts the digital signals into analogue signals and then sends them to an amplifier to play out the signals
  190. 190What are bitmaps?Bitmaps are a regular mesh of cells called pixels. Each pixel contains a colour value.
  191. 191What is the resolution of a bitmap?It's height in pixels x it's width in pixels
  192. 192What is the colour depth of a bitmap?Number of bits stored for each pixel
  193. 193What is the size in pixels of an image?It's width in pixels x it's height in pixels
  194. 194How do you calculate the storage requirements for a bit mapped image?size in pixels x colour depth
  195. 195Give 3 examples of metadatawidth, height, colour depth, author, date created, date modified, file size

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Flashcards on Comp sci All topics part 1, created by daniel upton on 04/03/2019.
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