Is it necessary to do ghusl after having an ultrasound tube inserted into the vagina?

He did ghusl just to be clean, and he did not realize that he was junub. Should he repeat his ghusl?

He suffers from too many wet dreams; he wakes up and finds wetness but he does not remember having a dream

If he touches his private part during ghusl, does he have to repeat wudu?

If a man wakes up and finds some wetness but does not know what it is

If a person becomes junub and does ghusl, then some maniy comes out after doing ghusl

He delayed the prayer until the time for it was over with no excuse; does he have to do ghusl?

He became junub in his friend’s house and he is afraid that he may be accused of impropriety

He did ghusl then he realized that the water had not reached his foot