CBSE 12th Physics Core Concepts Quiz
Test your understanding of key physics concepts from the CBSE 12th board syllabus
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Published February 5, 2026
Test your understanding of key physics concepts from the CBSE 12th board syllabus
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Ultraviolet rays
X-rays
Gamma rays
Infrared rays
Gamma rays
Gamma rays have wavelengths shorter than 0.01 nanometers and are produced by radioactive decay in nuclear reactions
Increases
Decreases
Remains constant
Becomes zero
Decreases
Unlike metals, semiconductors have negative temperature coefficient of resistance because higher temperatures create more free electrons
Diffusion of charge carriers
Applied voltage
Temperature change
Doping concentration
Diffusion of charge carriers
The depletion region forms when free electrons from n-type diffuse into p-type and holes from p-type diffuse into n-type, creating a barrier potential
Coulomb's law
Electromagnetic induction
Photoelectric effect
Ampere's law
Electromagnetic induction
Transformers work on Faraday's law of electromagnetic induction, where changing magnetic flux in one coil induces EMF in another coil
Generate electricity
Control chain reaction
Slow down neutrons
Cool the reactor
Slow down neutrons
Moderators like heavy water slow down fast neutrons to thermal neutrons, making them more likely to cause nuclear fission
Reflection
Rayleigh scattering
Diffraction
Interference
Rayleigh scattering
Rayleigh scattering occurs when sunlight hits air molecules, scattering blue light more than other colors due to its shorter wavelength
Describes atomic structure
Explains wave nature of light
Relates kinetic energy of photoelectrons to frequency
Calculates atomic mass
Relates kinetic energy of photoelectrons to frequency
The equation hf = φ + KEmax demonstrates that photoelectron energy depends on light frequency, not intensity, proving light's quantum nature
Circuit becomes open
Resonance occurs
Current becomes zero
Voltage doubles
Resonance occurs
At resonance (XL = XC), the circuit impedance becomes purely resistive and current reaches its maximum value
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