Magnetic Properties - Properties and Applications of Materials - Engineering Sciences Previous Year Questions

1

2008 · Engineering Sciences · Properties and Applications of Materials · Magnetic Properties

Engineering Sciences (XE) 2008

For a hard magnet, the remnant induction (B_r) is 0.5 Tesla and the coercive field (H_c) is 4×10⁵ A.m^-1. The energy loss of the magnet per cycle is

A

2 kJ.m^-3

B

20 kJ.m^-3

C

40 kJ.m^-3

D

80 kJ.m^-3

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2

2009 · Engineering Sciences · Properties and Applications of Materials · Magnetic Properties

Engineering Sciences (XE) 2009

Match the following classes of materials given in Column I with the electron spin alignments in atoms shown in Column II.

A

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3

2010 · Engineering Sciences · Properties and Applications of Materials · Magnetic Properties

Engineering Sciences (XE) 2010

If the effective magnetic moment of Fe³⁺ is equal to 5 μ_B, the magnetic moment in μ_B per formula of γ-Fe₂O₃ (which is inverse spinel with cation defects on the octahedral site) is

A

zero

B

2.5

C

5

D

10

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4

2012 · Engineering Sciences · Properties and Applications of Materials · Magnetic Properties

Engineering Sciences (XE) 2012

The best magnetostrictive material is

A

Nd₂Fe₁₄B

B

Fe₃O₄

C

Cu₂MnAl

D

ZnFe₂O₄

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5

2012 · Engineering Sciences · Properties and Applications of Materials · Magnetic Properties

Engineering Sciences (XE) 2012

Calculate the saturation magnetization (M_sat) for bcc iron of lattice parameter 2.866 Å.

A

0.79 × 10⁶ A/m

B

1.5 × 10⁶ A/m

C

3.15 × 10⁶ A/m

D

4.73 × 10⁶ A/m

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6

2014 · Engineering Sciences · Properties and Applications of Materials · Magnetic Properties

Engineering Sciences (XE) 2014

The temperature of the antiferromagnetic-to-paramagnetic transition is called

A

Curie temperature

B

Curie-Weiss temperature

C

Neel temperature

D

Debye temperature

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7

2015 · Engineering Sciences · Properties and Applications of Materials · Magnetic Properties

Engineering Sciences (XE) 2015

Which of the following is NOT a soft magnetic material?

A

Iron-silicon steel

B

Nickel zinc ferrite

C

Nickel iron alloy

D

Alnico

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8

2016 · Engineering Sciences · Properties and Applications of Materials · Magnetic Properties

Engineering Sciences (XE) 2016

Match the type of magnetism given in Group 1 with the material given in Group 2:

Group 1	Group 2
P: Ferromagnetic	1: Nickel oxide
Q: Ferrimagnetic	2: Sodium
R: Antiferromagnetic	3: Magnetite
S: Paramagnetic	4: Cobalt

A

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

B

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

C

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

D

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

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9

2017 · Engineering Sciences · Properties and Applications of Materials · Magnetic Properties

Engineering Sciences (XE) 2017

Which of the following statement(s) is / are true regarding susceptibility of a material (i) Magnetic susceptibility is positive for a diamagnetic material (ii) Magnetic susceptibility is negative for a diamagnetic material (iii) Magnetic susceptibility is negative for an antiferromagnetic material (iv) Magnetic susceptibility is positive for a paramagnetic material

A

(ii) and (iv)

B

(i) and (iii)

C

(ii) and (iii)

D

(i) and (iv)

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10

2018 · Engineering Sciences · Properties and Applications of Materials · Magnetic Properties

Engineering Sciences (XE) 2018

If a material is repelled in an external magnetic field then it is

A

Ferromagnetic

B

Diamagnetic

C

Paramagnetic

D

Antiferromagnetic

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11

2019 · Engineering Sciences · Properties and Applications of Materials · Magnetic Properties

Engineering Sciences (XE) 2019

An iron bar magnet having coercivity of 7000 A m^-1 is to be demagnetized. The bar is introduced fully inside a 0.25 m long solenoid having 150 turns of wire. The electric current required to generate the necessary magnetic field is ______ A. (round off to 1 decimal place)

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12

2020 · Engineering Sciences · Properties and Applications of Materials · Magnetic Properties

Engineering Sciences (XE) 2020

Fe₃O₄ (also represented as FeO.Fe₂O₃) is a FCC structured inverse spinel (AB₂O₄) material where 1/8 of tetrahedral sites are occupied by half of B cations and 1/2 of the octahedral sites are occupied by remaining B and A cations. The magnetic moments of cations on octahedral sites are antiparallel with respect to those on tetrahedral sites. Atomic number of Fe is 26 and that of O is 8. The saturation magnetic moment of Fe₃O₄ per formula unit in terms of Bohr magnetons (μ_B) will be ______ μ_B. Ignore contribution from orbital magnetic moments.

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13

2021 · Engineering Sciences · Properties and Applications of Materials · Magnetic Properties

Engineering Sciences (XE) 2021

A magnet of mass 50 g has a magnetic moment of 4.2 × 10⁻⁷ A m². The density of the magnet is 7.2 g cm⁻³. The intensity of magnetization in A m⁻¹ is ______ (round off to 3 decimal places)

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14

2023 · Engineering Sciences · Properties and Applications of Materials · Magnetic Properties

Engineering Sciences (XE) 2023

The magnetization (M) – magnetic field (H) curves for four different materials are given below. Which one of these materials is most suitable for use as a permanent magnet?

A

B

C

D

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15

2024 · Engineering Sciences · Properties and Applications of Materials · Magnetic Properties

Engineering Sciences (XE) 2024

Which of the following types of materials exhibit(s) positive magnetic susceptibility?

A

Paramagnetic

B

Diamagnetic

C

Ferrimagnetic

D

Ferromagnetic

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16

2025 · Engineering Sciences · Properties and Applications of Materials · Magnetic Properties

Engineering Sciences (XE) 2025

The unit of measurement for magnetic dipole moment of a body is

A

A m²

B

A m⁻¹

C

Wb m⁻²

D

Wb m⁻¹

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17

2025 · Engineering Sciences · Properties and Applications of Materials · Magnetic Properties

Engineering Sciences (XE) 2025

B is the magnetic flux density and T_c is the critical temperature. The Meissner effect is represented by

A

B = 0 at T ≤ T_c

B

B = 0 at T > T_c

C

B ≠ 0 at T ≤ T_c

D

∇⋅B = 0 at T = Tc

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18

2026 · Engineering Sciences · Properties and Applications of Materials · Magnetic Properties

Engineering Sciences (XE) 2026

Fe has a density of 7.87 g cm⁻³, atomic mass of 55.84 g mol⁻¹ and net magnetic moment per atom of 2.22 Bohr magnetons (μB). The saturation magnetization of Fe, in A m⁻¹, is ______×10⁵ (rounded off to one decimal place).
Given: μB = 9.27×10⁻²⁴ A m², Avogadro number = 6.023×10²³ mol⁻¹

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