There are a number of different depths for a number of different bits. The depth needed depends on the project.
A bit depth is a number of bits used to represent the colour of a single pixel.
Actually, Bit depth will affect file size. For example: 1-bit=2kb 4-bit=21kb 24-bit=24kb
32
The main difference between WAV files with a bit depth of 32 and 16 is the amount of detail in the audio they can capture. A 32-bit depth allows for more dynamic range and precision in recording audio compared to a 16-bit depth, resulting in higher quality sound with more subtle nuances and clarity.
32
Standard VGA is 16bit.
Most of the image editors (including MSPaint, GIMP, Photoshop) are allowing you to set the bit depth when saving to a file.
Yes, the higher the better. Trust me, it is glaringly obvious.
The main difference between 8-bit, 10-bit, and 12-bit color depths in digital imaging is the number of colors they can represent. 8-bit color depth can display 256 different colors. 10-bit color depth can display 1,024 different colors. 12-bit color depth can display 4,096 different colors. In general, higher bit depths allow for more accurate and detailed color representation, resulting in better image quality and smoother gradients.
That will depend on the settings such as bit depth and file format.
The maximum color depth supported by GIMP in 32-bit mode is 32 bits per channel, allowing for a total of 96 bits per pixel.
Please see attached links.