Computer Science > EXAM > COMPUTER STUDIES AND AZ 104 TOPICAL QUESTIONS AND ANSWERS PLUS PAST PAPERS 2023 WITH TEST EXAMS (All)

COMPUTER STUDIES AND AZ 104 TOPICAL QUESTIONS AND ANSWERS PLUS PAST PAPERS 2023 WITH TEST EXAMS

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Answer all questions in this section 1. Using a program flowchart explain the “WHILE…DO” interaction construction. ( 3marks) • It is a repetitive control structure that is used to carry ou... t conditional looping, i.e. when the number of repetitions are not known in advance. • It is possible for the loop to be executed zero times. The general formula of the While…Do structure is: WHILE...Boolean expression...Do program statement 2. Explain two uses of an uninterruptible power supply. (2 marks) • Eliminate power quality defects e.g. amplitude fluctuations, spikes e.t.c • To reduce power line noise through line conditioners • To provide power to the computer for a while when power goes off. 3. Explain the meaning of backup. (2 marks) It means making of copies of data or programs incase the originals are corrupted or lost. If the system fails it can be rebuilt with accurate data. It is used to protect data from accidental erasure or hardware problems. 4. Define an operating system. (2 marks) It is a program or suite of programs that controls use of hardware and entire operation of the system. 5. State two advantages of electronic spreadsheets over manual worksheets. (2 marks) • You can insert functions, formulas, macros and you can work with a huge amount of data while manual worksheets are limited. • The automatic recalculation facility • It utilizes powerful computer aspects such as speed, accuracy, and efficiency that enable the user to accomplish tasks quickly • It offers a large virtual sheet for data entry [Show More]

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