Question 1: Explain in your own words what a pixel is and how images are stored digitally using pixels.

Answer: A pixel is the smallest unit of a digital image, representing a single point of color. Images are stored digitally by assigning a color value to each pixel, which together form the complete image.

Question 2: Describe the difference between black and white images and coloured images in terms of digital data storage.

Answer: Black and white images store only two colour values (black and white) using 1 bit per pixel, while coloured images store multiple colour values (red, green, blue) using more bits per pixel to represent a wider range of colours.

Question 3: What is the purpose of a colour depth in digital images?

Answer: Colour depth determines the number of colours that can be displayed in an image, with higher colour depth allowing for more detailed and realistic colours.

Question 4: A digital image has a resolution of 1920 x 1080 pixels. How many pixels are there in total?

Answer: Total pixels = 1920 multiplied by 1080 = 2,073,600 pixels.

Question 5: Complete the truth table for an AND gate with inputs A and B.

Answer: The output of an AND gate is 1 only when both inputs A and B are 1; otherwise, it is 0.

Question 6: Draw the logic circuit for an OR gate. Label the inputs and output clearly.

Answer: A correct sketch should show a standard OR gate symbol with two input lines entering the gate and one output line leaving, with labels 'A' and 'B' for inputs, and 'Output' for the output line.

Question 7: Sketch a simple digital circuit that uses a NOT gate to invert a signal. Include labels for each part.

Answer: A correct sketch would show a NOT gate symbol with one input line labeled 'Input' and one output line labeled 'Inverted Output'.

Question 8: Explain how binary numbers are used to encode pixel colours in digital images.

Answer: Binary numbers are used to represent different colour values for each pixel. Each colour component (red, green, blue) is assigned a binary value, and combining these values gives the final colour for the pixel.

Question 9: Describe what a bitmap image is and one advantage and one disadvantage of using bitmap images.

Answer: A bitmap image is a digital image composed of pixels arranged in a grid. Advantage: High quality for detailed images. Disadvantage: Large file size for high-resolution images.

Question 10: Sketch a simple representation of a digital image stored as an array of pixel values, indicating how each pixel's colour is stored.

Answer: A sketch should show a grid of pixels, with each pixel labeled with a binary or colour value (e.g., 000000 for black, 111111 for white), illustrating how the image data is stored.