Raj is going to school. When he is not in school, you will find him working in his farm. Can you consider him as a worker? Why?

Yes, Raj can be considered as a worker. This is because his work is contributing to the total output of the farm. Further, as implied by the definition of worker, a person who is engaged in an economic activity or is assisting anyone in an economic activity and, thereby, contributing to the GDP of the country is regarded as worker, so, Raj is a worker.