CBSE Class 12 Alternating Current — practice questions
24 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 12 Alternating Current in the app →The peak voltage of Indian household AC at rms $230$ V is approximately:An inductor of $0.1$ H is connected to a $50$ Hz AC source. Its inductive reactance is:In a series LCR circuit, resonance occurs at angular frequency:An ideal transformer with primary $1000$ turns and secondary $50$ turns is fed $230$ V AC. Secondary voltage iThe effective value of an alternating current is called its:The household line voltage of 220 V is which kind of value?An inductor in an ac circuit offers:A capacitor in an ac circuit offers:The SI unit of reactance is the:The total opposition of an ac circuit is called its:Alternating voltages are stepped up or down by means of:The rms current equals the dc current that would produce the same:At resonance in a series LCR circuit, the impedance is:At resonance the current amplitude in the circuit is:Besides an inductor, resonance needs the circuit to contain a:The quantity cos of the phase angle is called the:A current that dissipates no power is referred to as:Maximum power is dissipated in a series LCR circuit at:Inductive reactance is directly proportional to the:At the resonant frequency, the two reactances are:A radio is tuned to a station by matching the resonant frequency of:Resonance is described as a phenomenon that is:The impedance of a series LCR circuit at resonance equals:A lagging wattless current is neutralised by adding an equal: