n. 口试, 口头测验

[ noun ]
an examination conducted by spoken communication
<noun.communication>

Viva \Vi"va\, interj. [It.]
Lit., (long) live; -- an exclamation expressing good will,
well wishing, etc. -- n. The word viva, or a shout or sound
made in uttering it.
[Webster 1913 Suppl.]

A wilder burst of ``vivas''. --R. H. Davis.
[Webster 1913 Suppl.]