There are a number of different sounds that a bus can make. These can include the loud roar of the engine, the honking of the horn, or the whoosing of the wheels.
A bus makes a "whoosh" sound.
The U has a short U (uh) sound in bus. The long U (long OO) is heard in boos, booze, and boost.
Beep Beep!
bus
No. The A has a schwa sound, to rhyme with bus and fuss.
A bus door typically makes a "whoosh" sound as it opens and closes. The sound is produced by the hydraulics and air pressure mechanism that operates the door.
vibration
vroom
Strictly speaking, you would ride "in the bus" because to be "on the bus" would mean that you are on the roof. However, people often say that they ride on the bus when they mean that they are sitting or standing inside it.
The sound made by buses is typically referred to as engine noise or bus engine rumble.
That depends how close you measure to the bus. The closer - the louder! The distance is very important if you measure with a sound pressure level meter.
There's the "s" sound like in "bus" and the other is like in "cars".