Answer : Diode have two terminals.
Answer : Thyristor have three terminals anode, cathode and Gate.
Description : A MOSFET has how many terminals?
Answer : A MOSFET having three terminals 1st one is Gate (insulated), 2nd one is Source and 3rd one is Drain.
Answer : Yes BJT have internal capacitances.
Answer : Yes BJT have second breakdown problem.