GATE MT Electronic, magnetic and optical properties of materials. PYQs & Answers

Questions 1–10 of 11. Imported answers require independent review unless marked reviewed.

Diamond has low

Your answerChoose one option.

electrical conductivity

modulus of elasticity

hardness

thermal conductivity

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Match Column I with Column II.

Column I (P) Gallium arsenide (Q) Barium titanate (R) Iron - 4 wt.% silicon (S) Yttrium-barium-copper oxide

Column II (1) Superconductor (2) Soft magnetic material (3) Semiconductor (4) Piezoelectric material

Your answerChoose one option.

P – 3, Q – 4, R – 2, S – 1

P – 2, Q – 4, R – 3, S – 1

P – 3, Q – 2, R – 1, S – 4

P – 4, Q – 2, R – 1, S – 3

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Figures P, Q, R and S schematically show the atomic dipole moments in the absence of external magnetic field. Which one of the following is the correct mapping of nature of magnetism to atomic dipole moments?

Diagram for Metallurgical Engineering question 39

Your answerChoose one option.

P – Diamagnetism, Q – Antiferromagnetism, R – Paramagnetism, S – Ferromagnetism

P – Ferromagnetism, Q – Antiferromagnetism, R – Diamagnetism, S – Paramagnetism

P – Paramagnetism, Q – Ferromagnetism, R – Diamagnetism, S – Antiferromagnetism

P – Ferromagnetism, Q – Diamagnetism, R – Antiferromagnetism, S – Paramagnetism

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If saturation magnetization of iron at room temperature is 1700 kA m

, the magnetic moment (in A m

) per iron atom in the crystal is: ______ × 10

(round off to 1 decimal place).

(Given: Lattice parameter of iron at room temperature = 0.287 nm)

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A dielectric material is:

Your answerChoose one option.

Electrical conductor

Metallic magnet

Two coupled electrical conductors

Electrical insulator

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Match the elements in Column I with their electronic behavior given in Column II.

Column I: (P) Copper (Q) Iron (R) Mercury (S) Silicon

Column II:

Ferromagnetic

Superconducting

Semiconducting

Diamagnetic

Your answerChoose one option.

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

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

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

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

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Zone refining of Si results in residual P content of 0.1 parts per billion by weight. The electrical conductivity of this zone refined Si is ______ Ω

·m

(round off to two decimal places).

Given:

Avogadro number is

Density of Si is 2.33 g·cm

Atomic weight of P is 30.97.

Charge of electron is

A·s.

Mobility of electron is 0.2 m

·V

·s

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For intrinsic Si at room temperature, the electron concentration = the hole concentration =

, and the electron and hole mobilities are 0.1 and 0.2 m

·V

·s

respectively. What is the room temperature electrical conductivity?

The charge of an electron is

Your answerChoose one option.

0 (Ω·m)

1.6 × 10

(Ω·m)

3.2 × 10

(Ω·m)

4.8 × 10

(Ω·m)

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If the net magnetic moment of an Fe atom in BCC structure is 2

, then the saturation magnetization of Fe is ______ (kA m

to one decimal place) Given:

; Lattice parameter of BCC iron is 0.287 nm Note: kA is kiloAmperes

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Arrange the magnetic moment of neighboring atoms in a one-dimensional lattice in Group-I to the corresponding magnetic material in Group-II

Group-I [P] Random [Q] Parallel [R] Antiparallel [S] Antiparallel and unequal

Diagram for Metallurgical Engineering question 46

Group-II [1] Antiferromagnetic [2] Ferrimagnetic [3] Paramagnetic [4] Ferromagnetic

Your answerChoose one option.

P-4; Q-1; R-3; S-2

P-3; Q-4; R-1; S-2

P-2; Q-4; R-1; S-3

P-1; Q-2; R-3; S-4

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GATE MT Electronic, magnetic and optical properties of materials. PYQs

How to practice Electronic, magnetic and optical properties of materials.

Question 19

Question 43

Question 39

Question 20

Question 4

Question 39

Question 50

Question 13

Question 47

Question 46