Magnetism and Matter is a Class 12 Physics chapter that carries about 1.5% of the Physics questions in NEET. Practise it with 38 questions covering 2 topics, each with an explanation.
Sample questions on Magnetism and Matter with answers
8 questions from the practice bank, spread across the chapter's topics. The full set is in the app.
Question 1: Bar Magnet as a Magnetic Dipole
The tangent law, tanθ = B/H, is used with:
- A a potentiometer
- B a galvanometer's shunt
- C a deflection magnetometer, to compare magnetic fields
- D a voltmeter
Answer: C. a deflection magnetometer, to compare magnetic fields
Why: A magnetic needle in two perpendicular fields settles at an angle θ.
Question 2: Magnetic Properties of Materials (Dia, Para, Ferro)
Ferromagnetic materials lose their magnetism above a certain temperature called the:
- A boiling point
- B Curie temperature
- C melting point
- D triple point
Answer: B. Curie temperature
Why: Above the Curie temperature, thermal agitation disrupts the alignment of magnetic domains, and a ferromagnetic material behaves as merely paramagnetic.
Question 3: Bar Magnet as a Magnetic Dipole
If the magnetic field in which a magnet oscillates is made four times stronger, its time period becomes:
- A four times
- B half
- C double
- D one quarter
Answer: B. half
Why: T = 2π√(I/MB) ∝ 1/√B.
Question 4: Magnetic Properties of Materials (Dia, Para, Ferro)
According to Curie's law, if the absolute temperature of a paramagnetic sample is doubled, its susceptibility becomes:
- A half
- B double
- C unchanged
- D four times
Answer: A. half
Why: χ = C/T.
Question 5: Bar Magnet as a Magnetic Dipole
The SI unit of magnetic dipole moment is:
- A T m
- B N/A
- C A/m
- D A m²
Answer: D. A m²
Why: M = NIA.
Question 6: Magnetic Properties of Materials (Dia, Para, Ferro)
A material suitable for making a permanent magnet should have:
- A high retentivity and high coercivity
- B high retentivity and low coercivity
- C low retentivity and high coercivity
- D low retentivity and low coercivity
Answer: A. high retentivity and high coercivity
Why: The magnet must stay magnetised (high retentivity) and resist being demagnetised (high coercivity), as steel does.
Question 7: Bar Magnet as a Magnetic Dipole
The magnetic dipole moment of a bar magnet is a vector directed from:
- A north pole to south pole
- B south pole to north pole
- C perpendicular to the magnet's axis
- D randomly in any direction
Answer: B. south pole to north pole
Why: The magnetic dipole moment vector of a bar magnet points from the south pole to the north pole, inside the magnet.
Question 8: Magnetic Properties of Materials (Dia, Para, Ferro)
According to Curie's law, the magnetic susceptibility of a paramagnetic substance is:
- A directly proportional to absolute temperature
- B inversely proportional to absolute temperature
- C independent of temperature
- D inversely proportional to the square of temperature
Answer: B. inversely proportional to absolute temperature
Why: Curie's law states χ = C/T, so paramagnetic susceptibility decreases as temperature increases.