Question

1.
(C)
Vacuum tubes are used, instead of solid
state devices, where :
(D)
(A) Very high power is to be handled
5.
Nu
(B) Very long life time is desirable
is :
(C)
Very low frequency signal is
involved
(A)
(D)
None of the above
(B)​

Answer 1

option c is correct answer is your question

Answer 2

Where is the question there is only options.