CBSE 2025 · Region 2 · Set 1 · Q7 · 1 mark
A transformer is connected to a $\displaystyle 200$ V ac source. The transformer supplies $\displaystyle 3000$ V to a device. If the number of turns in the primary coil is $\displaystyle 450$, then the number of turns in its secondary coil is-
Official answer
From CBSE’s own marking scheme for this paper.
(D)
$\displaystyle 6750$
Alternating CurrentTransformersApplymcqeasy
More from Alternating Current
- An alternating current is given by I=I 0 cos (100 π) t. The least time the current takes to decrease from its…2025 · asked 3×
- A resistor of 30 Ω and a capacitor of 250/(π) μ F are connected in series to a 200 V, 50 Hz ac source.…2023 · asked 3×
- An inductor, a capacitor and a resistor are connected in series across an ac source of voltage. If the…2023 · asked 3×
- Assertion: A series LCR circuit behaves as a pure resistive circuit at resonance. Reason (R): At resonance, X…2025 · asked 3×
- How does the resistance differ from impedance? With the help of a suitable phasor diagram, obtain an…2023 · asked 3×
- Assertion: In an ideal step-down transformer, the electrical energy is not lost. Reason (R): In a step-down…2025 · asked 3×
- An ac voltage is given as v=14 sin (314 t) V. The average and the effective value of the voltage (in V ) over…2026 · asked 3×
- The figure shows the variation of capacitive reactance (X C) of two ideal capacitors of capacitances C 1 \& C…2026 · asked 3×
CBSE Class 12 Physics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.