List of top Physics Questions on Alternating current asked in Haryana PMT

Alternating current cannot be measured by $D.C.$ ammeter because

A transistor-oscillator using a resonant circuit with an inductor $L$ (of negligible resistance) and a capacitor $C$ in series produce oscillations of frequency $f$ . If $L$ is doubled and $C$ is changed to $4C$, the frequency will be