Which of the following combinations should be selected for better tuning of an $L-C-R$ circuit used for communication?

An inductor of reactance $1 \Omega$ and a resistor of $2 \Omega$ are connected in series to the terminals of a 6 V (rms) AC source. The power dissipated in the circuit is

The output of a step-down transformer is measured to be 24 V when connected to a 12 W light bulb. The value of the peak current is

As the frequency of an AC circuit increases, the current first increases and then decreases. What combination of circuit elements is most likely to comprise the circuit?

In an alternating current circuit consisting of elements in series, the current increases on increasing the frequency of supply. Which of the following elements are likely to constitute the circuit?