Perform the following binary arithmetic and give your answers in decimal notation:
(i)1010.101 + 11.011
(ii)1010.011 – 11.011 (b) Covert the following numbers into their binary equivalents (i)0.562510 (ii)0.312510 (c) Using four – bit twos compliment, perform the following arithmetic 1012- 1112
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Study the following diagram and answer the questions that follow
From the diagram:
(i) Name two devices that are used for long term storage (ii) Name three peripherals shown on the diagram that are used for input (iii) Name two other devices that a computer Aided Design (CAD) user might wish to add to the set- up above (b)A customer wishes to purchase a computer system. The customer can buy a word processor, spreadsheet, database and a drawing package separately or as an integrated package. State three advantages why many computer users prefer integrated packages to separate packages. (c) (i) An anti- virus software installed in a computer is loaded into the main memory each time the computer is switched on Explain three ways in which computer virus are spread from one computer to another (ii) Give two reasons why an anti virus package should be updated regularly
RESPONSES
(a) (i)ROM
Hard disk 2GB HDD (ii)
To enable remove upcoming viruses/new viruses For maintenance purposes (patches) To upgrade/replace outdated antiviruses. The diagram below shows a layout of a computer network used by a law farm. A workstation and a printer are located in every consulting room
(i) Name the network topology depicted in the diagram
(ii) Name the device labeled D (iii) State four functions of the device labeled ‘server’ (iv) Give two advantages and one disadvantage of the above network design (v) If the firm intends to open extra offices in two different towns, name any three hardware devices that would be required (vi) State any two security problems that might arise by linking the offices in different towns (b) What is spyware?
RESPONSES
(a) (i)Star
(ii) Hub or Switch/Router (iii)File sharing
Advantages .
A lecturer keeps the following student details in a database: name, age, course
(a) write an expression you would use to compute the year of birth of a student using this year as the current year
(b) what query expressions would the lecturer use to list the students whose age is above 15 years and below 25 years? (c) Which expression would the lecturer use to generate? (i) The number of students in the database? (ii) The mean age of the students in the database? (d)Name and describe any two types of database models
RESPONSES
Study the flowchart below and answer the questions that follow
(a) What would the flowchart generate as output if the value of N at input was:
(i) 6? (ii)1? (b) Write a pseudocode that does the same thing as the flowchart above (c) Modify the flowchart so as to reject an input below and to avoid the looping when the input is 0
RESPONSES
(a) Subtract 01112 from 10012 (2 mks)00102 (b) Using twoâs compliment, subtract 7 from 4 and give the answer in decimal notation (4mks)7 = 1112 4 = 1002 -4 in twoâs compliment is 100 111 100 + (1)011 The resulting answer is 011 since the overflow is ignored. In decimal notation this is 310 (c) Convert(i) 91B16 to octal(a) Name and explain the function of the keyboard keys represented by the following symbols (2mks)
(b) Simulation is one of the application areas of computers(a) Explain what the following DOS commands will do when executed
(i) A: \copy ** B
(b) (i) With the aid of a diagram, explain hierarchical (tree) network topology
A network topology that, from a purely topologies viewpoint, resembles an interconnection of star networks in that individual peripheral nodes are required to transmit to and receive from one other node only, toward a central node, and are not required to act as repeaters or regenerators.
(a) List three paragraph formatting activities in word processing(3 mks)
(a) State the stage of program development in which:
(i) A flowchart would be drawn
(b) State the output of the following flowchart segment
A school magazine organizes its works in directories. The directory WP contains the files CATS, EXAMS and ASSIGNMENTS. The directory Sp contains the spreadsheet files and the DB directory contains the database files. The directory PROG is contained in the others directory. The directory WP is contained the PERSONAL directory. Given that the directory student contains directories SP, WP, and OTHERS.
(a) Draw the directory tree structure with C as the root
A school has brought a computer system. The hardware items include: 800 MHz processor, 640 MB of RAM, a sound card, speakers, a monitor, a keyboard, a 12 GB hard disk, a floppy disk drive, CDRW drive, a mouse, a modem, an inkjet printer and a joystick. The software supplied includes: an OS, a BASIC interpreter and the following packages: Spreadsheets, graphic, word processor, art database and games.
(a) List three input devices from the given specifications
(a) Explain three ways by which computer users can protect their eyes from harmful emissions from the computer screen
(b) List three factors be considered when deciding on the choice of an electronic data processing method
(a) List three application areas of artificial intelligence
Bidii wholesalers have two categories of customers for order processing. Category ‘A’ obtains 10% discount on all orders upto Kshs 10,000 otherwise the discount is 20% on the entire order. Category ‘B’ obtains 30% discount on all orders if the debt repayments is ‘good’ otherwise the discount is 15%. Draw a flowchart for the order processing.
An operating system organizes files in directories as shown in the chart below.Study it and answer the questions that follow.
(a) (i) What is the name of this file structure?
(ii) One of the files in MISCELLANEOUS has a file name similar to one in CHEMISTRY in Form 1. Describe what happens if all the contents of CHEMISTRY are copied to MISCELLANEOUS. (iii) What will happen if an attempt is made to delete FORM2 while File_10 in MATHEMATICS is open? (iv) State four advantages of this structure. (b) State four properties that an operating system displays about a file. (c)A removable storage media unit connected to a single user microcomputer system is used for permanent storage of programs and data. State six file functions you would expect the operating system of the computer to provide to enable the user to maintain this storage media. (d) State two tasks performed by the operating system in each of the following resources: (i) memory; (ii) input/output devices.
RESPONSES
(a) (i) Hierarchical Structure/Tree structure.
(ii) File 02 and 03 with be replicated in miscellaneous.
(iv)
The information below is maintained by the patron of wildlife club in a school. Study it and answer the questions that follow.
(a) Describe the field values, records and file.
(b) State the most appropriate primary key for the list. (c) State the most appropriate data type for the fields: (i) admission number; (ii) membership number. (d) If a database was to be created for the list; Forms, Tables, Queries and Reports are likely to be used. (i) State the purpose of each of these objects. (ii) Which objects cannot be used to store the data in the list? (e) (i) How many field values are in the list? (ii) How many records are in the list?
EXPECTED RESPONSES
(a)The field values are the values assigned to the attributes, that is, actual names, classes.
(c) (i) Text/Number/character. (ii) Text/Character/String/alphanumeric. (i)
(ii) 11 List three advantages and three disadvantages of wired communication over wireless communication.31/12/2020 List three advantages and three disadvantages of wired communication over wireless communication.
Advantages
Disadvantages (b) Describe the following signals and state where each is applied in network communication: (i) analog; (ii) digital. (c) Name the two types of coaxial cables, (d) (i) Define the term network protocol. (ii) List four internet protocols.
RESPONSES
(a) Advantages
(ii) Digital: Pulses of electricity. (c)
(ii)
Describe two ways ¡n which a computer can represent a positive number and a negative number.31/12/2020 Describe two ways in which a computer can represent a positive number and a negative number.
(b) A particular computer stores numbers in a single 8-bit word. How would it represent 0.312510 ?
(c) What is the decimal equivalent of the number 1.01112? (d) Perform the decimal subtraction 1410- 610 using (i) regular binary; (ii) one’s complement.
Study the flow chart below and answer the questions that follow.
If DATA is the following sorted list of 13 elements, such that N 13:(where N is the number of elements in the list),1 1, 22, 30, 33, 40, 44, 55, 60, 66, 77,
80, 88, 99. (a) Determine the output from the flowchart if ITEM is: (1) 40 (ii) 99 (iii) 120 (iv) 5 (b) Explain the purpose of this flowchart. (c) Write a pseudocode for the above flowchart. Distinguish between the following pairs of terms
(i) Data verification and data validation
Data Validation
(a) A company has decided to computerize their operations. They have decided to purchase packages instead of developing their own programs. Give three advantages and two disadvantages of this approach.
Advantages
(a) Give three examples of network software
A computer specification has the following details:
Study the flowchart below and answer the questions that follow (a) Write a high level language program for the above flowchart (7mks) |
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