Download the chapter on Magnetism And Matter from the CBSE Class 12 Physics Assertion Reason Questions. Class 12 Physics Assertion Reason Questions with Answers were created using the most recent exam format. To gauge their degree of preparedness, students can complete the NCERT Class 12 Physics Chapter 5 Magnetism And Matter.
Magnetism And Matter Class 12 Assertion Reason Questions
The following questions consist of two statements – Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false and R is also false.
Assertion (A): Ferromagnetic substances can be permanently magnetized.
Reason (R): Ferromagnetic materials have strong atomic magnetic dipoles that align in the presence of an external magnetic field, leading to permanent magnetization.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The magnetic susceptibility of diamagnetic materials is negative.
Reason (R): Diamagnetic materials have weak atomic magnetic dipoles that align opposite to the applied magnetic field, resulting in a negative magnetic susceptibility.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Paramagnetic materials have a positive magnetic susceptibility.
Reason (R): Paramagnetic materials have weak atomic magnetic dipoles that align with the applied magnetic field, leading to a positive magnetic susceptibility.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): Magnetic field lines inside a bar magnet travel from the north pole to the south pole.
Reason (R): Magnetic field lines always form closed loops and have a direction from the south pole to the north pole outside the magnet.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The magnetic field lines inside a magnetically neutral region are straight and parallel.
Reason (R): In a magnetically neutral region, the magnetic field is zero, and magnetic field lines are straight and parallel.
Answer: (c) A is true but R is false.
Assertion (A): The magnetic moment of an atom arises due to the orbital motion of its electrons.
Reason (R): The magnetic moment of an atom is a result of the combined effects of the orbital motion and the intrinsic spin of its electrons.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The Curie temperature is the temperature above which a ferromagnetic material loses its magnetic properties.
Reason (R): At the Curie temperature, the thermal agitation disrupts the alignment of atomic magnetic dipoles in ferromagnetic materials, causing them to become paramagnetic.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The magnetic field lines inside a solenoid are similar to the magnetic field lines inside a bar magnet.
Reason (R): A solenoid behaves like a bar magnet with a north pole at one end and a south pole at the other, creating magnetic field lines similar to that of a bar magnet.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): The magnetization curve of a ferromagnetic material exhibits hysteresis.
Reason (R): Hysteresis is the property of ferromagnetic materials where the magnetic induction lags behind the magnetizing force, resulting in a loop-like magnetization curve.
Answer: (a) Both A and R are true and R is the correct explanation of A.
Assertion (A): A paramagnetic material becomes diamagnetic at very low temperatures.
Reason (R): At very low temperatures, thermal energy decreases, leading to increased alignment of atomic magnetic dipoles, making the paramagnetic material behave like a diamagnetic material.
Answer: (b) Both A and R are true but R is not the correct explanation of A.
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