Yes it worked i tested now and Heard clicking sound.It may or may not work, depending of the specific model of the relay.
If there is no datasheet for the relay in question that say about minimum required voltage for the relay to close, then you have to test each relay manually.
Yes it worked i tested now and Heard clicking sound.Most 6 V relays will work on 5 V. However you may not get exactly 5 V on a 5 V power supply, so it may be a matter of testing it.
All the relays that I have seen need a lot more voltage to turn on than to keep them on. A 6 V relay might turn on at 4.5 V but then the voltage would have to be reduced to maybe 1 - 1.5 V before it turns off.
I would expect that to be more of a problem at high temperature, when the relay coil resistance rises.It may pull-in okay at normal room temperature, but could fail to at low temperatures, if that's of concern.