If the student has an off campus work permit, he is allowed to do any job up to 20 hours a week during the semester and full time during holidays. It could be hard to get a 20 hours a week job in a factory. In my experience they seem to prefer and mostly have full time staff. In a call centre it might be an option and in a store, stocking shelves or whatever I think it would definitely be an option. It should also be easy to get a part time job in a restaurant.
does factory job's need heavy lifiting around 20 KG'S?

is suitable for college going student??? and can i know what are the hourly wage rates in those factory job's..

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