MHT CET 2025 20th April Evening Shift | Alternating Current Question 3 | Physics

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.

MHT CET 2025 20th April Morning Shift

MCQ (Single Correct Answer)

-0

A resistance of $200 \Omega$ and an inductor of $\frac{1}{2 \pi} \mathrm{H}$ are connected in series to a.c. voltage of 40 V and 100 Hz frequency. The phase angle between the voltage and current is

$\tan ^{-1}(1 / 5)$

$\tan ^{-1}(1 / 4)$

$\tan ^{-1}(1 / 3)$

$\tan ^{-1}(0.5)$

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