Discussion
Compared to BJT, a JFET has :
Answer: D
Compared to a BJT, a JFET has higher input impedance and low voltage gain.
The JFET's gate-source junction is reverse biased, so almost no gate current flows and the input impedance is very high, typically many megohms, against the kilohms of a BJT's forward-biased base-emitter junction.
Its transconductance is much lower than a BJT's at the same current, so a JFET amplifier usually gives lower voltage gain. That rules out 'lower input impedance', 'higher voltage gain' and the option pairing high input impedance with high gain.
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