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GATE 2026 MT – Question 42

Materials Science and Non-Metallic Materials · Electronic and magnetic properties · 2 marks · Multiple choice

Match the terms in Column I with the corresponding attributes in Column II.

Column I:

(P) Wiedemann–Franz law

(Q) Néel temperature

(R) Hall voltage

(S) Curie law

Column II:

(1) Charge-carrier concentration

(2) Paramagnetism

(3) Ratio between thermal conductivity and electrical conductivity of metals

(4) Diamagnetism

(5) Antiferromagnetism

  1. P-4, Q-3, R-2, S-1
  2. P-2, Q-5, R-1, S-3
  3. P-3, Q-5, R-1, S-2
  4. P-3, Q-4, R-5, S-2

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Correct answer: (C) P-3, Q-5, R-1, S-2

Explanation

Wiedemann–Franz relates thermal and electrical conductivities of metals (3). Néel temperature is associated with loss of antiferromagnetic order (5). Hall voltage determines charge-carrier concentration in the simple single-carrier model (1). Curie law describes paramagnetic susceptibility (2). Hence **P3,Q5,R1,S2, C**.