Test: Representing data - Year 9 MCQ

The sequence of digits 31122012 represents a date in the format DDMMYYYY, where 31 is the day, 12 is the month (December), and 2012 is the year.
Therefore, the correct answer is A "This is a date."

Data enters a computer during the input stage, which is the first step in the data processing cycle (input, processing, output). During the input stage, devices like keyboards, mice, or scanners are used to enter data into the system.
Option A is incorrect because "entry stage" is not a standard term, and data entry occurs during the input stage.
Options B and D are incorrect as they do not accurately describe the stage when data is entered.

Data validation involves checking entered data to ensure it is sensible, correct, and free of errors. This includes verifying that data is reasonable (e.g., an age field containing a number between 0 and 120), accurate for the context (correct), and without errors (e.g., no invalid characters). Therefore, option C is the most comprehensive answer, as validation encompasses all these aspects.

In most computers, a byte consists of 8 bits. This is the standard definition in modern computing systems, where a bit is a single binary digit (0 or 1), and a byte is used to represent a single character or a small integer. While some historical or specialized systems may use different byte sizes, 8 bits is the standard for most computers today.

The term "Kilabyte" is not a standard measure of storage size due to its incorrect spelling. The correct term is "kilobyte," which represents 1,000 (or 1,024 in binary) bytes. Options A (Megabyte), B (Gigabyte), and C (Terabyte) are all valid units of storage size, representing increasingly larger amounts of data.

A monitor is not a means of entering data into a computer, as it is an output device used to display information. Options A (barcode reader), B (keyboard), and D (scanner) are all input devices that allow data to be entered into a computer system.

Binary code, which represents data and instructions in a computer, can be stored in various locations, including built-in memory (e.g., RAM), hard disk drives, and external devices like memory sticks (flash drives). Therefore, option D ("All of the above") is correct.

Data consists of raw, unprocessed facts, such as letters, numbers, or characters, that have no inherent meaning until they are analyzed or processed. When data is processed or given context, it becomes information.
Option B is incorrect because data with meaning is information, not raw data.
Option A is incorrect, as data is not software.
Option D is too narrow, as data can include more than just numbers.

A barcode reader is an automatic input device that scans barcodes and inputs data directly into a computer system without manual intervention. Options A (keyboard), B (mouse), and C (touch screen) require user interaction to input data, making them less automatic compared to a barcode reader.

Data in computers is represented using binary code, which consists of combinations of ones (1s) and zeros (0s). These binary digits (bits) are used to encode all types of data, including numbers, letters, and instructions.
Options A and B are incorrect, as binary code requires both 1s and 0s.
Option D is incorrect, as letters and numbers are higher-level representations, not the binary format used by computers.