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The bus is longer than the car
The length of a standard pencil is typically around 7.5 inches in the imperial measurement system. However, pencil lengths can vary slightly depending on the manufacturer and design, with some being shorter or longer. Generally, this size is considered standard for most writing and drawing pencils.
The longer side is usually called "length".
Basically your uncertainty is the innaccuracy or your measurement. For instance if you had a yard ruler that was marked only in inches and the length of the object you were measuring lied somewhere between 12 and 13 inches; you could state that the objects length is 12 1/2 inches ± 1/2 inch. The ± 1/2 part is your uncertainty, it means the measurement could be either 1/2 inch longer or shorter than your stated measurement.
Yes, the length of a pendulum affects its swing. The oscillation will be longer with a longer length and shorter with a shorter length.