Is hyperactivity found in all people with adhd?

Nope . Add is a neurobiologic condition that impacts executive control. Management of brain activities is under executive control. So hyperactivity is physical movement that isn't properly controlled. Underactivity is the same as over activity from neurologic perspective. Some add people are overactive, some are underactjve. Hyperactivity is not necessary for an add diagnosis.
Types of adhd. No. A person can have adhd withou hyperactivity. There are a number of different types of adhd. These are: predominantly inattentive type, pred hyperactive/impulsive type and combined type. The disorder got relabeled a number of years back. Used to be called add and adhd; whereby, the latter consisted of hyperactivity while the former did not.
No. The majority of the time there is some component of hyperactivity, but it is possible to have adhd, inattentive sub-type, without any hyperactivity. This variant is relatively more common in girls. Also, the hyperactivity component of adhd more often decreases with age than the inattentive problems, so an adult is also relatively more likely to have this variant.

Related Questions

Can you tell me how can amphetamine reduce hyperactivity in people with adhd?

These meds have. A paradoxically calming effect on those suffering from adhd. See http://www.Drugabuse.Gov/publications/drugfacts/stimulant-adhd-medications-methylphenidate-amphetamines for a complete explanation of why these stimulants work the opposite way with those who suffer from adhd. Read more...
In short. in short, think of the stimulant medications as "stimulating" the brakes of the brain (inhibitory controls of the prefrontal cortex). Read more...
Brains underaroused. Brains of children with ADHD ae underaroused or less active than normal. Amphetamines increase the brain level of nor epinephrin, making it more alert and the children less like overtired 2 year olds. Read more...