This is a '51 forum and, while Abshieks comment may be correct on a PC, the comments are invalid for embedded.

a low level language is
1. Machine dependant
2. Needs architecture to be well understood,
So does high level.
3. (assembly) Has one to one mapping with the machine code generated
4. hard to write programs in.
not necessarily, some routines are actually easier to write in assembler.
5. generates efficient code in size and speed.
nope, but allow a proficient programmer to generate efficient code in size and speed

1. Eglish formal Language like instructions.
2. Hardware indepandant
nope, try to transfer a C program from a '51 to a PIC
3. architechture independant
whatever that means, but see abhove
4. easy to write programs in the sense that programmer has no need to waste is energy in above three points but just to keep his logig good
nope, see above
5. compiled machine code possibly has the one to many mapping.

Erik