It has been 1 week since I joined the work. But still no tasks are assigned. Should I inform to manager?
If you have nothing to do:
- Inform your superior
- Acquaint yourself with the tools you will be using, be it CAD, IDE:s etc.
- Explore the "black hole", every company (I haven't been employed by a single one yet where this is not the case) has a file system that is difficult to navigate and where information is stored haphazardly. The problem is often trying to find the information you need rather than actually doing a certain task.
- Read up on company policies,
- Get to know your colleagues
- Be proactive
As it has been pointed out in the comments below, it is presumptious to assume that someone is working in a code environment. Given the nature of many questions it is an easy mistake to make, the answer has been corrected to be more general.