Do these scholarships or countries provide working hours or work visas for students in USA?

No, scholarships do not provide work hours or work visas.

In the USA, as an international student on an F-1 visa, you can work on-campus up to 20 hours per week during semesters and full-time during official school breaks. For off-campus work related to your studies, you need special authorization such as CPT (Curricular Practical Training) or OPT (Optional Practical Training), which serve as work permits.

Your work eligibility depends on the student visa rules of the country, not on the scholarship itself.