There are several jobs that require quick wit and a mechanical aptitude test. The most common jobs involving mechanics are jobs in the engineering field and in mechanical servicing. These include mechanical engineers, electronic engineers and plumbing technicians; basically anything involving design, maintenance and troubleshooting of mechanical devices. Electricians may also need to take tests involving mechanical aptitude. Even people such as firemen and police officers need to have some level of mechanical knowledge in order to deal with mechanical situations when they come on to the scene to check it out.
Depending on how high the position is within the organization or how much skill is required, the mechanical reasoning test may differ in length and difficulty.