MHT CET 2025 20th April Evening Shift | Alternating Current Question 2 | Physics

An e.m.f. $e=E_0 \cos \omega t$ is applied to a circuit containing $L, C$ and $R$ in series where $X_L=3 R$ and $\mathrm{X}_{\mathrm{C}}=\mathrm{R}$. The average power dissipated in the circuit is

$\frac{E_0^2}{5 R}$

$\frac{E_0^2}{10 R}$

$\frac{\mathrm{E}_0^2}{15 \mathrm{R}}$

$\frac{E_0^2}{20 R}$

MHT CET 2025 20th April Evening Shift

MCQ (Single Correct Answer)

-0

An ideal transformer converts 220 a.c. to 3.3 kV a.c. to transmit a power of 4.4 kW . If primary coil has 600 turns then alternating current in secondary coil is

$\frac{5}{3} \mathrm{~A}$

$\frac{1}{4} \mathrm{~A}$

$\frac{4}{3} \mathrm{~A}$

$\frac{2}{3} \mathrm{~A}$

MHT CET 2025 20th April Morning Shift

MCQ (Single Correct Answer)

-0

A coil of self-inductance $L$ is connected in series with a bulb and an a. c. source. Brightness of the bulb decreases when

an iron rod is inserted in the coil.

frequency of a.c. source is decreased.

number of turns in the coil is reduced.

a capacitance of reactance $\left(\mathrm{X}_{\mathrm{C}}-\mathrm{X}_{\mathrm{L}}\right)$ is included in the same circuit.

MHT CET 2025 20th April Morning Shift

MCQ (Single Correct Answer)

-0

A $20 \Omega$ resistance, 10 mH inductance coil and $15 \mu \mathrm{~F}$ capacitor are joined in series. When a suitable frequency alternating current source is joined to this combination, the circuit resonates. If the resistance is made $\frac{1}{3} \mathrm{rd}$, the resonant frequency

remains unchanged.

is doubled.

is quadrupled.

is halved.

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