NCERT Solutions for Chapter: Alternating Current, Exercise 1: MCQ

If the rms current in a $50 \mathrm{Hz}$ AC circuit is $5 \mathrm{A}$, the value of the current $1/300$ seconds after its value becomes zero is

An alternating current generator has an internal resistance $Rg$ and an internal reactance $Xg$. It is used to supply power to a passive load consisting of a resistance $Rg$ and a reactance $X_L$. For maximum power to be delivered from the generator to the load, the value of $X_L$ is equal to 

When a voltage measuring device is connected to $\mathrm{AC}$ mains, the meter shows the steady input voltage of $220\mathrm{V}$. This means
 

To reduce the resonant frequency in an $RLC$ series circuit of a generator,

 Which of the following combinations should be selected for better tuning of an $LCR$ 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 $6 \mathrm{V} \left(\mathrm{rms}\right)$ a.c. source. The power dissipated in the circuit is

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