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ISC Class 12 Wave Optics — practice questions — page 2

Explore 50 free Wave Optics questions in ISC Class 12 Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Wave Optics questions and exercises with answers

Showing questions 31–50 of 50.

At the resonant frequency of a series RLC circuit, the current amplitude is:Read the answer and worked solution →A current that flows while no power is dissipated is sometimes called a:Read the answer and worked solution →Why is ac voltage preferred over dc voltage for power distribution?Read the answer and worked solution →The household line voltage of 220 V is quoted as which kind of value?Read the answer and worked solution →A well designed transformer may reach an efficiency of more than:Read the answer and worked solution →Which transformer loss arises from currents induced in the iron core itself?Read the answer and worked solution →Which transformer loss arises from repeatedly reversing the magnetisation of the core?Read the answer and worked solution →Inductor against capacitorRead the answer and worked solution →Sort by phase behaviourRead the answer and worked solution →Light passes from air to glass ($n = 1.5$). Brewster's angle is:Read the answer and worked solution →HUYGENS' PRINCIPLE states that every point on a wavefront acts as a:Read the answer and worked solution →NEET · Physics · Interference or DiffractionRead the answer and worked solution →BREWSTER'S LAW for the polarising angle θ_B relates to the refractive index n as:Read the answer and worked solution →In single-slit diffraction, the central maximum is:Read the answer and worked solution →In Young's experiment, a BRIGHT fringe (constructive interference) requires path difference = ?Read the answer and worked solution →In Young's double-slit experiment, the fringe width β is given by:Read the answer and worked solution →The resolving power (RP) of a diffraction grating with N slits in the m-th order is:Read the answer and worked solution →The motional EMF induced in a conductor of length $\ell$ moving with velocity $v$ perpendicular to a uniform magnetic field $B$ is:Read the answer and worked solution →Polarisation of light is direct experimental evidence that light is a:Read the answer and worked solution →Match each idea to its scientistRead the answer and worked solution →

Worked practice questions

At the resonant frequency of a series RLC circuit, the current amplitude is:

  1. Minimum
  2. Mistaken
  3. Misplaced
  4. Maximum
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Correct answer: D. Maximum

1. At resonance the two reactances cancel each other exactly. 2. Only the resistance is left to limit the current. 3. At resonant frequency the current amplitude is maximum. 4. It equals the voltage amplitude divided by the resistance. _Source: syllabus Physics Part I, Ch 7 'Alternating Current'_

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A current that flows while no power is dissipated is sometimes called a:

  1. Wattless current
  2. Wattage current
  3. Wasteful current
  4. Watchful current
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Correct answer: A. Wattless current

1. In a purely reactive circuit the power factor is zero. 2. Current still flows, but no energy is consumed. 3. This current is sometimes referred to as wattless current. 4. So the answer is wattless current. _Source: syllabus Physics Part I, Ch 7 'Alternating Current'_

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Why is ac voltage preferred over dc voltage for power distribution?

  1. It carries more charge per hour
  2. It converts easily by transformer
  3. It travels faster along the wire
  4. It costs less to generate first
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Correct answer: B. It converts easily by transformer

1. The advantage lies in changing the voltage rather than in the current itself. 2. High voltage cuts transmission losses and low voltage is safe at home. 3. The main reason is that ac voltages can be easily and efficiently converted by transformers. 4. So the answer is easy conversion by transformer. _Source: syllabus Physics Part I, Ch 7 'Alternating Current'_

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More Physics topics

Moving Charges and MagnetismCurrent ElectricityElectromagnetic Induction & Alternating CurrentSemiconductor ElectronicsRay Optics and Optical InstrumentsElectromagnetic WavesAtoms and NucleiDual Nature of Radiation and Matter