FINAL QUIZ. Marlene Galea

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1 FINAL QUIZ Marlene Galea

2 Give 2 possible disadvantages of computerising a system

3 Give 2 possible disadvantages of computerising a system - Dependency : users may grow increasingly dependent on the computerised system such that work suffers a lot of the system is temporarily unavailable - Data security against hacking and data theft leads can be expensive, and there is still always the risk of security breaches.

4 Why is a compiler better suited than an interpreter for program distribution?

5 Why is a compiler better suited than an interpreter for program distribution? A compiler produces object code. Object code can be saved and directly executed later on. So object code can be distributed to run without further translation. So the actual code will not be seen by the user if a compiler is used which is desirable when distributing a program.however no object code is created with an interpreter. Also, if using a compiler, when a loop is run the translation is only done once, with an interpreter the loop is translated every time the program loops. Therefore an interpreted program will run slower when executing a loop.

6 What is the address space of a CPU with a 32 bit address bus? How does the address bus effect computer performance?

7 What is the address space of a CPU with a 32 bit address bus? How does the address bus effect computer performance? 2 32 Address space determines the number of memory locations that can be directly accessed by the CPU, so the greater the address space the more RAM the CPU can use. Having more RAM ensures more applications can run simultaneously and smoothly.

8 Give 2 advantages of computerising a system

9 Give 2 advantages of computerising a system Computers are more reliable and consistent than humans: so they may help avoid errors an accidents. When dealing with large volumes of data it is faster and more efficient to search for data on a computerised system than have humans do so.

10 What is the Internet? How is it different from the WWW?

11 What is the Internet? How is it different from the WWW? The internet is a global network of computers connected together in such a way as to be able to exchange data. The www is only part of the internet it is a system of interlinked hypertext documents contained on the internet.

12 Give 2 uses of the Internet in: Education Commerce

13 Give 2 uses of the Internet in: Education Online testing: online tests are efficient because they can be corrected by the system and hence give a student immediate results Video conferencing: this can be used to expose students to realities outside their school without the expense and time wastage of travelling: e.g. to discuss issues with experts or other students in other countries Commerce E-commerce: the selling of items on the internet using auction sites etc Advertising: online advertising is a very good way of reaching potential client.

14 What is Assistive Technology (AT)? Name an output and an input device used in AT

15 What is Assistive Technology (AT)? Name an output and an input device used in AT Assistive Technology (AT) refers to technology that allows greater independence for people with disabilities by enabling them to perform tasks that they were unable to accomplish before, or had great difficulty accomplishing, by providing new methods of using technology Input device: Output device: braille keyboard braille printer

16 What is the role of the ALU in a computer?

17 What is the role of the ALU in a computer? The ALU (Arithmetic Logic Unit) carries out the computer s mathematical functions and comparison operations

18 What is the role of the Control Unit in a computer?

19 What is the role of the Control Unit in a computer? The Control Unit is responsible for: locating, decoding and executing each instruction in a program data transfer between memory and peripheral devices

20 What are mnemonics and symbolic addressing?

21 What are mnemonics and symbolic addressing? Mnemonics are short, abbreviated words used in Assembly Language instead of binary patterns (e.g. LDA) Symbolic addressing is the use of variable names to refer to memory addresses. (e.g. num1)

22 Distinguish between the following three types of addressing Direct Addressing Immediate Addressing Symbolic Addressing

23 Distinguish between the following three types of addressing Immediate Addressing the instruction itself contains the value to be used. Eg. MOV A, #20h the value to be used is 20h Direct Addressing the instruction tells where the value can be found, but the value itself is out in memory. Eg. MOV A, 30h the values is found in memory location 30h Symbolic Addressing symbolic addressing the address of a store location is specified by means of an identifier, rather than the numeric value of the memory address. Eg. MOV A, num1 the value is stored in the variable num1

24 Distinguish between opcode and operand

25 Distinguish between opcode and operand Opcode is the code specifying the action to be carried out (eg. Add) Operand is the value on which the action is to be carried out or the address in memory where this value is stored (eg. 5)

26 Give 2 advantages and 2 disadvantages of using a LLL rather than a HLL

27 Give 2 advantages and 2 disadvantages of using a LLL rather than a HLL Advantages LLL run faster because they are closer to machine code Programs in LLL need less system resources to run Disadvantages Difficult to program in because they require a good knowledge of machine architecture Programs in LLL are not portable

28 Give 1 advantage and 1 disadvantage of a bus network

29 Give 1 advantage and 1 disadvantage of a bus network Advantage Less expensive to set up Disadvantages Performance degenerates as more computers are added

30 What personnel is/are responsible for the following Creating Test Data for a system Writing program code Creation and Update of websites Data entry

31 What personnel is/are responsible for the following Creating Test Data for a system Writing program code Creation and Update of websites Systems Analyst Programmer Web Master Data entry Data Entry Clerk

32 What is a CPU register? Mention 2 CPU registers and briefly describe their function

33 What is a CPU register? Mention 2 CPU registers and briefly describe their function A CPU register is a small amount of memory on the CPU where data can be temporarily stored Examples Program Counter holds the address of the next instruction Instruction register holds the address currently being executed

34 What is a database? Give 1 advantage of computerising a database

35 What is a database? Give 1 advantage of computerising a database A database is an organised collection of data and links between them such that information can easily be obtained from it. Advantages It is faster to obtain information and query the system

36 Use only AND, OR and NOT gates to produce a logic circuit which gives 1 only when one OR the other of two inputs is one but not both.

37 Use only AND, OR and NOT gates to produce a logic circuit which gives 1 only when one OR the other of two inputs is one but not both. This is asking for the XOR gate in terms of the OR, AND and NOT gate.

38 Give the truth table for the above

39 Give the truth table for the above A B A B A B AB A XOR B

40 Suggest 2 possible disadvantages of e- mail

41 Suggest 2 possible disadvantages of e- mail Spam may be sent and unnecessarily fill inbox One may receive a virus and other malware via

42 Compare the 3 types of looping constructs

43 Compare the 3 types of looping constructs Conditional Loops Undetermined Loops Do while loop Repeats one or more times Condition at end of loop While loop Repeats 0 or more times Condition at start of loop For loop Unconditional Loop Predetermined Loop

44 Why are tables in a database linked through relationships?

45 Why are tables in a database linked through relationships? So as to have no redundant data So database occupies less storage space and is faster to process Database is easier to update Saves time and money - data input costs time and money.

46 Complete the diagram explaining the creation of file generations?

47 Complete the diagram explaining the creation of file generations? Transaction File Sorting process Sorted Transaction File Master File Update Process New Master File Error Report

48 Distinguish between serial and direct access

49 Distinguish between serial and direct access Serial access means going through everything one by one, starting at the beginning, until you reach the item you want. If you wanted to print all the names in a database, using serial access would be fine because you are starting at the first and going right through to the end. Direct access means going straight to the item you want without having to go through other ones.

50 Mention 3 things that determine CPU performance.

51 Mention 3 things that determine CPU performance. Wordlength: the number of bits the CPU can handle at a go Cache memory: fast, volatile memory that holds a copy of recently accessed data in anticipation of its being used again in the near future Clock speed: the number of times the CPU clock changes state per second

52 Give 3 uses of the Internet

53 Give 3 uses of the Internet Research through vast amounts of sources: Looking up information for school projects, business interests etc E-commerce Social Networking

54 Which are the 3 programming constructs?

55 Which are the 3 programming constructs? Loop (repetition) Decision sequence

56 Is the check digit 6 for the number correct? (Using modulus 11 method)

57 Is the check digit 6 for the number correct? (Using modulus 11 method) /11 3 r 3 Therefore check digit is incorrect because there is a remainder

58 Briefly describe these forms of documentation Inline documentation User manual Installation manual

59 Briefly describe these forms of documentation Inline documentation these are comments in the program code that explain how the code works User manual instructions to the user that show how to operate the program. This manual should avoid too technical terms. Installation manual Instructions how to install the program including what hardware and software resources it requires

60 Give 1 application for Dot matrix printer MICR Laser Printer Barcode Reader

61 Give 1 application for Dot matrix printer Production of bills MICR Processing bank cheques Laser Printer On an office network Barcode Reader Bill production at a POS

62 Give 1 use for LOGO FORTRAN COBOL PROLOG

63 Give 1 use for LOGO to teach programming to young children FORTRAN to create programs to be used in scientific and mathematical applications COBOL- to create business applications PROLOG to create programs used in AI

64 Put the steps of the system life cycle in order 1. Maintenance of the new system 2. Project approval 3. Implementation 4. Designing and testing 5. Training staff 6. Documentation, both technical & user manuals 7. Feasibility study 8. Problem identification

65 Put the steps of the system life cycle in order 1. Maintenance of the new system 2. Project approval 3. Implementation 4. Designing and testing 5. Training staff 6. Documentation, both technical & user manuals 7. Feasibility study 8. Problem identification 8, 7, 2, 4, 6, 5, 3, 1

66 Outline the main steps in the fetch/execute cycle

67 Outline the main steps in the fetch/execute cycle CU fetches instruction from memory location pointed by PC Copy of the instruction is placed in the IR CU fetches required data/address of data PC is incremented to the next instruction CU activates necessary circuits to execute the instruction Back to 1 st step

68 Distinguish between general purpose and special purpose computers

69 Distinguish between general purpose and special purpose computers Special purpose computers: are designed to do one particular function General purpose computer can carry out a number of applications depending on the program being run

70 Distinguish between FAT and NTFS

71 Distinguish between FAT and NTFS NTFS allows the use of larger storage devices than FAT NTFS is a more recent filing system that is ideal for multi user systems allowing: User quotas on disks etc Improved file security

72 Draw the logic circuit and give the truth table for X = (A.B) + (C+B )

73 Draw the logic circuit and give the truth table for X = (A.B) + (C+B ) A B C

74 Draw the logic circuit and give the truth table for X = (A.B) + (C+B ) A B C A A.B B C+ B X

75 Subtract, using 8 bit two s complement, 13 from 54

76 Subtract, using 8 bit two s complement, 13 from = = Two s complement of (-13)

77 Distinguish between data validation and data verification

78 Distinguish between data validation and data verification Validation ensures that data entered is reasonable and complete while Verification ensures that the data is transferred correctly

79 Suggest 1 use for Batch Processing Operating System Hard disk Real time Operating System Logic Gates Light Pen Mainframes Palmtop

80 Suggest 1 use for Batch Processing Operating System Hard disk Real time Operating System Logic Gates Light Pen Mainframes Palmtop Payroll system Frequently used applications Military aircraft targeting system addition inside the CPU Booking systems Bank system Order taking at a remote POS

81 What is process control?

82 What is process control? The automatic monitoring and control of a system that responds to feedback input from sensors

83 Convert Binary Decimal Hexadecimal F

84 Convert Binary Decimal Hexadecimal F

85 Compare tailor made and off the shelf software

86 Compare tailor made and off the shelf software Tailor Made Software More expensive Not readily available Not possible to get user reviews Off the Shelf Mass produced, therefore cheaper Readily available One may get user opinions before buying

87 Suggest 3 ways how wordprocessing has facilitated office work

88 Suggest 3 ways how wordprocessing has facilitated office work Mail Merge: Automised production of personalised documents Language tools: spellchecker and thesaurus help user improve content quality Presentation tools: ability to modify and edit, fonts, paragraphs and page design allows one to produce more attractive documents.

89 Give 2 functions of an operating system

90 Give 2 functions of an operating system CPU Management: allocates CPU time to running processes Memory Management: allocates memory space to programs

91 Mention 1 portable magnetic storage device 1 read only electronic storage device 1 serial access device 1 optical storage device 1 volatile storage device

92 Mention 1 portable magnetic storage device: floppy disk 1 read only electronic storage device: ROM 1 serial access device: magnetic tape 1 optical storage device: CD 1 volatile storage device: RAM

93 Distinguish between global and local variables

94 Distinguish between global and local variables Local Variable: is declared at method or program section level and so has a scope limited to that method or program section within which it is declared. Global variable: is declared at class level and can be accessed from anywhere within the class.

95 Suggest 2 means of safeguarding data security

96 Suggest 2 means of safeguarding data security Using a firewall Using encryption

97 What is a sector?

98 What is a sector? The smallest addressable section of a disk.

99 What is a virus? Mention 1 other type of malicious code besides viruses

100 What is a virus? Mention 1 other type of malicious code besides viruses Malicious code written to automatically copy itself between and within computers and hence render them unreliable Other malicious code: trojan

101 Suggest 3 ways in which a spreadsheet can improve a family s budgeting efforts

102 Suggest 3 ways in which a spreadsheet can improve a family s budgeting efforts Efficient calculation of data Can easily represent data in graphical form, making it easier to analyse Can easily obtain answers to what if questions

103 What is software piracy? Suggest 2 ways a company may protect its software from piracy

104 What is software piracy? Suggest 2 ways a company may protect its software from piracy Software piracy is the unauthorised copying and distribution of software. Companies can try to protect themselves against piracy using: Key disk Software registration

105 Distinguish between flowchart and pseudocode

106 Distinguish between flowchart and pseudocode Both are ways of describing an algorithm however a flowchart is diagrammatic whilst pseudocode is purely textual.

107 Write a program that produces the following output: (where X is input by the user) 1 x X = answer 2 x X = answer. 12 x X = answer

108 Write a program that produces the following output: (where X is input by the user) An integer variable called sum A constant called vat with a value of 18% A constant called name with a value of Mario An array of names that can hold 10 names A two dimensional array that can hold 10 names and surnames

FORM 5 COMPUTING TIME: 1h 45min

FORM 5 COMPUTING TIME: 1h 45min DIRECTORATE FOR QUALITY AND STANDARDS IN EDUCATION Curriculum Management and elearning Department Educational Assessment Unit Annual Examinations for Secondary Schools 2014 Track 3 FORM 5 COMPUTING TIME: