System Analysis and Design
Which of the following statements is not true

pointers are useful in traversing a linked list
a checksum digit is used for detecting Errors in data transmission
All of these
None of these
at example of a hierarchical data structure is tree

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System Analysis and Design
Direct-access organization

means storing records in contiguous blocks according to a key.
Stores records sequentially but uses an index to locate records
has records placed randomly throughout the file
uses an index for each key type

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System Analysis and Design
A system analyst designs a new system by

adopting a developed system to the present environment
identifying sub systems and the interfaces between sub systems
None of these
propose alternatives to the current system
developing the system as a large, single unit

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