Is a B.S. in physics with concentrations in mechanical engineering be good to become an engineer?

Take the degree for the job you want to have. It's easier than mixing and matching and there is a better guarantee of you being accepted for that job.

Check with the State that you live in to find out if they will allow you to take the Engineer-in training and the Professional Engineers exams without having an Engineering Degree. If so, have at it. Otherwise you will always be at a distinct disadvantage in any of the engineering fields.

It`s a start.

The problem with getting a physics degree is that even though the scope is similar but more broad than engineering is twofold: 1) When you apply for and interview for jobs, you have to convince them that you're an engineer. People with engineering degrees don't have to do that, so that puts you at a disadvantage. 2) When a physicist is hired as an engineer, he/she has to be trained as an engineer. Usually engineering students get experience with common industry tools and can jump right into the work without having to learn new software, whereas physics majors usually don't get training in those tools and have to learn everything from scratch. These two factors combined usually put the physicist first at a disadvantage for hiring, and in the case that he/she is hired the starting salary is usually about $10,000/yr lower than the starting salary of the engineer, although it doesn't take long before that gap disappears. The undergraduate physics degree won't matter if you do a masters in engineering. You will probably have to take 2 or 3 engineering undergraduate courses as prerequisite for the graduate engineering courses, but it won't be much. You're wrong about the physics degree being better for medical school. All in all, every degree has a fair game and the same chances for medical school except for biology which is at an advantage in having a broader view but at a disadvantage because almost everybody else applying for medical school is a biology major. All you need to apply for medical school are prerequisite courses (anatomy, physiology, organic chemistry, etc.) and a good MCAT score.