Question 1: Explain what a pixel is in the context of digital images.

Answer: A pixel is the smallest individual element of a digital image, representing a tiny square of colour or shade. Many pixels together form the complete image.

Question 2: Describe how a black-and-white image is stored using binary data.

Answer: Each pixel in a black-and-white image is represented by a binary value: '0' for black and '1' for white. The image data is a series of these binary values.

Question 3: If a digital image has a resolution of 1920 by 1080 pixels, how many pixels are in the image?

Answer: The total number of pixels is 1920 multiplied by 1080, which equals 2,073,600 pixels.

Question 4: Sketch a simple diagram showing how three basic colours (red, green, blue) combine to create different colours in an image.

Answer: A correct sketch would show three overlapping circles labeled 'Red', 'Green', and 'Blue'. The overlapping areas should indicate how mixing these colours produces other colours (e.g., red + green = yellow).

Question 5: Complete the following truth table for an AND logic gate with two inputs, A and B:

Answer: | A | B | Output | |---|---|--------| | 0 | 0 | 0 | | 0 | 1 | 0 | | 1 | 0 | 0 | | 1 | 1 | 1 |

Question 6: Complete the truth table for an OR logic gate with inputs A and B:

Answer: | A | B | Output | |---|---|--------| | 0 | 0 | 0 | | 0 | 1 | 1 | | 1 | 0 | 1 | | 1 | 1 | 1 |

Question 7: Draw a logic circuit diagram that uses an AND gate and an OR gate to produce a combined output based on two inputs, A and B.

Answer: A correct sketch would show two inputs (A and B). Input A goes into an AND gate, input B goes into an OR gate. The outputs of both gates are then connected to a final output line, illustrating the combination of logic gates.

Question 8: Describe how digital images use binary data to store colour information for each pixel.

Answer: Each pixel's colour is stored as a binary number, with bits representing the levels of red, green, and blue. These binary codes determine the exact colour displayed for each pixel.

Question 9: Sketch a simple diagram showing how changing the binary value of a pixel from 0 to 1 might change its colour in a black-and-white image.

Answer: A correct sketch would depict two identical squares labeled 'Pixel 1'. One is marked with binary '0' (black), and the other with binary '1' (white), showing the change in colour.

Question 10: Explain why increasing the resolution of an image results in a larger file size.

Answer: Higher resolution means more pixels are used to display the image, which increases the amount of binary data needed to store all pixel information, leading to larger file sizes.