COMPUTER STUDIES QUESTIONS WITH ANSWERS
Distinguish between Real, Integer and Character data types as used in programming ( 3mks)
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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 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To enable remove upcoming viruses/new viruses For maintenance purposes (patches) To upgrade/replace outdated antiviruses.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 segmentState two health issues that may result from prolonged use of computers
Arrange the following data units in ascending order of size (2mks)BYTE, FILE, BIT, NIBBLE
BIT, NIBBLE, BYTE, FILE (a) explain Binary Coded Decimal code of data representation (1mk)
(b) Write the number 45110 in BCD notation (1mk)
Outline two ways in which computer can be used in hotels (2mks)
Name two types of relationships that can be applied in database design (2mks)
Define the term artificial intelligence (2 mks)
Artificial intelligence can be defined as the field of study concerned with using computer hardware and software to simulate human thought processes such as imagination and intuition. Consider the linear arrays:
(a) Name the control structure depicted by the flowchart below
(b) Explain the following terms as used in program implementation (2mks)
(a) A serial file comprises of records placed in positions 1 to 10. State the position of the end of file marker (1 mk)
(b) State the purpose of each of the following (2mks)(i) File server software
(a) State the purpose of registers in a computer system (1mk)To hold data and instructions temporarily as they are being processed in the CPU ( 2mks) (b) Name two multi-programming operating systems (2mks)Windows 9X, Linux, Windows 2000, and Windows NT
The cells K3 to K10 of a worksheet contain remarks on student’s performance such as very good, good, fair and fail depending on the average mark. Write a formula that can be used to count all students who have the remark “very good” (3mks)
(a) What is a disk formatting? (1mk)
To prepare storage medium by defining tracks and sectors where data will be placed in compliance with specific operating system requirements.
(b) Indicate whether the following devices are used for input or output (2mks)
Arrange the following job titles in the order of their seniority;Database administrator, ICT manager, systems analyst
Either
Give three ways in which horticultural farmers can benefit from the use of information and communication Technology (ICT)
ICT serves as a:
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