1) common signs to detect a virus attack. (more than 1 answer can be right ) a) the computer runs very slow  b) computer restarts on its own c) computer shuts down on its own d) computer often stops responding 2) we should use descriptive names for files and folders so that they are easier to locate . a)  true b) false 3) the storage capacity of Recycle bin is generally _______ % of the drive space. a) 20% b) 10% c) 5% d) 15% 4) DOS stands for a) desktop operating system  b) driver operating system c) driver oppressing system d) disk operating system 5) how many main types of OS are there a) 7 b) 5 c) 8 d) 6 6) what is present on the right corner of the taskbar a) date and time b) start button c) notification area d) active application 7) a file name should contain the name of the file and extension of the file separated with a a) (\) Backslash b) (.) Period c) (?) Question mark d) (,) comma 8) Microsoft OS uses NTFS ( New Technology File System ) which is supported by a) windows b) Unix c) Linux d) ubuntu 9) what are cookies? a) small files stored on the user's computer when you visit a website  b) they are designed to hold data specific to a particular client and website  c) both a & b d) none of the following 10) which of the following is the correct maintenance activity a) block the vents b) take regular backup of the data c) running antivirus periodically is unessential d) always overcharge the battery

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