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21. The mistakes, committed by interchanging two digits in a numeric field, during data entry, is called
Transposition error
Transcription error
Beta testing error
Alpha testing error
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22. Which of the following is not considered a tool at system design phase ?
Data flow diagram
Decision table
Pie chart
System flow chart
23. The best file organization in which one has to process all data records in a file called
Indexed
Sequential
Direct access
Random access
24. Controls must be established in a system on order to
Prohibit tampering with information by unauthorized person
Verify that all data have been processed
The concurrent operation of an existing system and a new system
All of the above
25. Coding and testing is done in following manner :
Adhoc
Cross sectional
Bottom-up
Top-clown
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