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Computer-Obj
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*WAEC COMPUTER STUDIES*
*NUMBER ONE*
(1a)
(i) Sign in: Sign in is the process of logging into a system or service using a username and password or other credentials to access personalized content or features. By signing in, users can access their accounts, settings, preferences, and other information that is specific to them.
(ii) Search engine: A search engine is a web-based tool or software program that allows users to search for information on the internet. Users can enter keywords or queries into the search engine, which then retrieves relevant results from its index of websites and web pages.
(1bi)
(i) Figure 1: Random File Access Method
(ii) Figure 2: Sequential File Access Method
(1bii)
(i) FIGURE 1:
ADVANTAGES:
(PICK ONE ONLY)
(i) Fast access to any record
(ii) Direct access to data
(iii) Efficient for reading and writing large amounts of data
(iv) Suitable for large databases
(v) Support for random access and sequential access operations
DISADVANTAGES:
(PICK ONE ONLY)
(i) Inefficient for large data sets
(ii) Prone to data corruption
(iii) Limited portability between systems
(iv) Difficulty in managing complex data structures
(v) Limited built-in search capabilities
(ii) FIGURE 2
ADVANTAGES:
(PICK ONE ONLY)
(i) Simple to implement
(ii) Cost-effective
(iii) Suitable for large amounts of data
(iv) Easy to maintain
(v) Can be read sequentially
DISADVANTAGES:
(PICK ONE ONLY)
(i) Slow access speed
(ii) Inefficient for frequent random access
(iii) Limited concurrent access
(iv) Difficulty in updating and inserting data
(v) Susceptible to data corruption
==================================
(3ai)
A file in computer terms refers to a collection of data or information that is stored under a specific name on a storage device.
(3aii)
A record is a collection of related fields that are usually treated as a single unit of information. In the context of databases, a record represents a single entry that contains multiple pieces of information about one entity.
(3aiii)
A field is a single piece of information; it is a basic element of data storage that has a specific meaning and context. Fields are used to construct records, where each field in a record typically holds one piece of information relevant to the record.
(3bi)
(i)The student’s ID number
(ii)Date of birth
(iii)Emergency contact information.
(3bii)
To edit a field in a student’s record, one would generally need to open the database application and navigate to the record in question. Next, they would locate the specific field that requires editing and enter the new information. After making the necessary changes, they would save the updated record to ensure that the edits are retained.
(3biii)
(i)Microsoft Access
(ii)MySQL.
===================================
(4ai)
A logic truth table shows all possible combinations of inputs and their corresponding outputs, illustrating the logical relationships between them.
(4aii)
(i) AND gate
(ii) OR gate
(4aiii)
| X | Y | Z = X AND Y | Z = X OR Y|
|—–|—–|————-|———–|
| 0 | 0 | 0 | 0 |
| 0 | 1 | 0 | 1 |
| 1 | 0 | 0 | 1 |
| 1 | 1 | 1 | 1 |
(4b)
A comparator is a logic device used to compare two binary numbers or signals. It typically has two input terminals for the numbers to be compared and outputs a logical indication of their relationship, such as equality, greater than, or less than. The output is determined based on the comparison of corresponding bits of the input numbers. In essence, it examines whether one input is greater than, less than, or equal to the other. Comparators are widely used in digital circuits, such as in arithmetic and logic units (ALUs), in microprocessors, and in data processing applications. They play a crucial role in tasks such as sorting, decision-making, and controlling the flow of data in electronic systems.
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