Job on visit visa

Yes Madiha, even if you have an iqama, as per Labour Law, you are not allowed to work, however, its best that you find a job in some international school, they will hire you without your iqama!

NO

You can do it if you want, but it is illegal, and if found, you will be deported and probably banned from the country for some years.  This is also true if you work when under your husband's sponsorship.  Once you come on a residence visa and have an iqama, you will have to transfer your iqama to the employer if you want to work.  Or, find a job while on visit, and see if they are willing to bring you on a work visa from your home country.  Not likely, but possible, especially if you are highly educated and/or have special skills.