inches
Litres.
None. Feet are an outdated unit of measurement and so could never be the most appropriate.
The general answer is "linear measurement". Specific possibilities would be feet, yards, and meters.
A caliper, specifically a digital or vernier caliper, would be the most appropriate instrument to measure the diameter of a marble. It allows for precise measurement of small dimensions and can easily accommodate the curved surface of the marble. Alternatively, a micrometer could also be used for even more precise measurements, although it is less commonly employed for round objects like marbles.
The word "measure" means to determine the dimensions of an area or object. An example of this word in a sentence would be, "The builder had to measure each of the walls in the living room to determine how much hardwood he would need to finish the job."
Depending on your countries standard unit of measurement but either feet or meters would be the answer.
meters
liters
The length of a pencil. your waist/chest measurement the dimensions of a table
No, measuring a sofa in grams is not appropriate as grams are used to measure weight, not dimensions. It would be more appropriate to measure a sofa in inches or centimeters to determine its size.
kilograms
Its radius in Kilometres would be appropriate.
Litre.
Litres.
Centimetres, millimetres or inches would be most appropriate for measuring the length of a ruler.
The 'foot' or the 'meter' would both do nicely.
Feet and inches would be the most appropriate measurement used to measure a classroom.