Will voltage gain change in non-inverting op amp when load is connected?
Is there any significant change in amplified output voltage when a load is connected to the output compared to a no-load connection in a non-inverting op-amp? 


No, provided the op-amp's maximum current ratings (or minimum load resistance) is not exceeded.


  Why?


Because the negative feedback will cause the op-amp to adjust its output until the correct output voltage is given.