MHT CET 2025 20th April Evening Shift | Alternating Current Question 1 | Physics

An a.c. e.m.f. of peak value $=230 \mathrm{~V}$ and frequency 50 Hz is connected to a circuit with $\mathrm{R}=11.5 \Omega, \mathrm{~L}=2.5 \mathrm{H}$ and a capacitor all in series. The value of capacitance is ' C ' for the current in the circuit to be maximum. The value of C and maximum current are respectively $\left(\pi^2=10\right)$.

$2 \mu \mathrm{~F}, 10 \mathrm{~A}$

$4 \mu \mathrm{~F}, 20 \mathrm{~A}$

$6 \mu \mathrm{~F}, 10 \mathrm{~A}$

$8 \mu \mathrm{~F}, 20 \mathrm{~A}$

MHT CET 2025 20th April Evening Shift

MCQ (Single Correct Answer)

-0

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.

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