For a nurse. Thats alot! get above 10k riyal mark.
For a couple, yes you can survive here in Qatar with a 10k+ salary if you're given accommodation but if you're stuck with that salary and have two or more kids you might want to reconsider it unless HMC provides you with free education for children.
But since you do not have kids yet, you'll live better than 80% of the people here in Qatar.