When an $N-P-N$ transistor is used as an amplifier,which of the following occurs?

$A$ $CE$ amplifier has a voltage gain of $G$. The transistor used has a transconductance of $0.03 \ mho$ and a current gain of $25$. If this transistor is replaced by another transistor with a transconductance of $0.02 \ mho$ and a current gain of $20$,the new voltage gain will be ........

In common emitter configuration of a transistor amplifier, $r_i$, $R_L$ and $\beta$ represent the input resistance, load resistance, and the a.c. current gain, respectively. The voltage gain $A_V$ and power gain $A_P$ are represented in magnitude by which of the following expressions?

$A$ transistor is used as an amplifier in $CB$ mode with a load resistance of $5 \, k\Omega$. The current gain of the amplifier is $0.98$ and the input resistance is $70 \, \Omega$. The voltage gain and power gain respectively are:

Input signal to a common emitter amplifier having a voltage gain of $1000$ is given by $v_i = (0.004 \, V) \sin(\omega t + \pi/2)$. The corresponding output signal is

In $n-p-n$ transistor, in $CE$ configuration: