ASSERTION REASON QUESTIONS

Class 11 Physics – 10 Assertion-Reason Questions
(CBSE Board Exam 2025-26 Pattern)

1. Assertion (A): Electric field inside a conductor is zero in electrostatics.
   Reason (R): Excess charge resides only on the surface of the conductor.


2. Assertion (A): Gauss’s law is useful only when charge distribution has symmetry.
   Reason (R): Only then electric field is constant in magnitude and direction on Gaussian surface.


3. Assertion (A): Torque on a dipole is zero when it is aligned parallel or antiparallel to uniform electric field.
   Reason (R): τ = pE sinθ and sin0° = sin180° = 0.


4. Assertion (A): In series CR circuit, current leads the voltage by 90°.
   Reason (R): In a pure capacitor, voltage lags behind the current by 90°.


5. Assertion (A): Wheatstone bridge is most sensitive when all four resistances are nearly equal.
   Reason (R): At balanced condition, galvanometer shows zero deflection.


6. Assertion (A): Cyclotron cannot accelerate electrons.
   Reason (R): Electrons gain relativistic speeds very quickly due to their small mass.


7. Assertion (A): Moment of inertia of a hollow cylinder about its axis is greater than that of a solid cylinder of same mass and radius.
   Reason (R): Mass is distributed farther from the axis in hollow cylinder.


8. Assertion (A): Angular momentum of a planet revolving around the sun is conserved.
   Reason (R): Gravitational force is a central force, hence torque is zero.


9. Assertion (A): Specific heat of water is very high.
   Reason (R): A large amount of heat is required to break hydrogen bonds.


10. Assertion (A): Fringe width in Young’s double-slit experiment is directly proportional to distance of screen from slits.
    Reason (R): β = λD/d.

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Class 11 & 12 Chapter-wise Assertion-Reason Questions यहाँ से लें

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Class 12 – Assertion Reason Questions (HTML)

Class 12 Physics – 10 Assertion-Reason Questions
(CBSE Board Exam 2025-26 Pattern)

1. Assertion (A): Stopping potential in photoelectric effect is independent of intensity of incident light.
   Reason (R): Maximum kinetic energy of photoelectrons depends only on frequency of light.


2. Assertion (A): de-Broglie wavelength of electron decreases if accelerating potential is increased.
   Reason (R): λ = h / √(2meV).


3. Assertion (A): Width of depletion region decreases when p-n junction is forward biased.
   Reason (R): Forward bias reduces the diffusion barrier potential.


4. Assertion (A): Binding energy per nucleon is maximum for ⁵⁶Fe.
   Reason (R): Iron-56 is the most stable nucleus.


5. Assertion (A): Sky appears blue during the day and reddish at sunset.
   Reason (R): Intensity of scattered light ∝ 1/λ⁴.


6. Assertion (A): Optical fibres work on the principle of total internal reflection.
   Reason (R): Refractive index of core is greater than that of cladding.


7. Assertion (A): Average power consumed in a purely inductive or purely capacitive AC circuit is zero.
   Reason (R): Phase difference between voltage and current is 90°.


8. Assertion (A): Nuclear force is charge independent.
   Reason (R): Strong nuclear force between n-n, p-p and n-p is almost equal.


9. Assertion (A): When one slit is closed in Young’s double-slit experiment, interference fringes disappear.
   Reason (R): Interference requires two coherent sources.


10. Assertion (A): Mass of a radioactive nucleus slightly decreases after emission of α or β particle.
    Reason (R): Part of mass is converted into energy according to E = mc².

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Class 11 & 12 Chapter-wise Assertion-Reason Questions यहाँ से डाउनलोड करें

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