Class 12 Physics – Daily Revision MCQ (English Medium)
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Two tuning forks of frequencies 256 Hz and 260 Hz are sounded together. How many beats are heard per second?
Chapter 6: Superposition of Waves
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Answer: C. 4
Beat frequency = difference of the two frequencies = 260 − 256 = 4 beats per second.Which harmonics are present in the vibrations of an air column in a pipe closed at one end?
Chapter 6: Superposition of Waves
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Answer: A. Only odd harmonics
A closed end is always a node and the open end an antinode, so only odd multiples of the fundamental frequency occur.Kirchhoff's first law (the current law at a junction) is consistent with the conservation of:
Chapter 9: Current Electricity
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Answer: D. electric charge
Charge cannot pile up at a junction, so the current entering it equals the current leaving it.Two long straight parallel wires carry currents in the same direction. The force between the wires is:
Chapter 10: Magnetic Fields due to Electric Current
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Answer: B. attractive
Parallel currents attract and antiparallel currents repel.A particle of charge q moves in a circle of radius R in a plane perpendicular to a uniform magnetic field B. Its linear momentum is:
Chapter 10: Magnetic Fields due to Electric Current
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Answer: B. qBR
Magnetic force gives the centripetal force: qvB = mv²/R, so p = mv = qBR (the cyclotron formula).According to Curie's law, the magnetic susceptibility of a paramagnetic material is:
Chapter 11: Magnetic Materials
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Answer: C. inversely proportional to its absolute temperature
Curie law: magnetisation M ∝ B/T, so susceptibility χ = C/T, i.e. it falls as temperature rises.Lenz's law, which gives the direction of an induced current, is a consequence of the law of conservation of:
Chapter 12: Electromagnetic Induction
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Answer: B. energy
The induced current opposes the change causing it, so work must be done to produce it; otherwise energy would be created from nothing.A transformer, used to change the voltage of alternating current, works on the principle of:
Chapter 12: Electromagnetic Induction
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Answer: C. mutual induction
A changing current in the primary coil changes the flux linked with the secondary coil and induces an emf in it — mutual induction.In a purely inductive AC circuit, the alternating current:
Chapter 13: AC Circuits
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Answer: D. lags behind the emf by π/2
For a pure inductor, i = i₀ sin(ωt − π/2): the current lags the emf by a phase angle of π/2 (90°).A series LCR circuit has L = 0.1 H and C = 10 μF. Its resonant frequency is about:
Chapter 13: AC Circuits
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Answer: A. 159 Hz
fr = 1/(2π√LC) = 1/(2π√(0.1 × 10⁻⁵)) = 1/(2π × 10⁻³) ≈ 159 Hz.
Class 12: MCQ in other subjects
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All questions are written by PadhaiNotes in our own words from the chapters of the official Maharashtra State Board Balbharati textbook (ebalbharati.in). Each question shows its chapter.