Solid State Test

Result

Solid State Test - 3

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Weekly Quiz Competition

Question 1
4 / -1

Paramagnetic substances are magnetised in a magnetic field in the same direction. Paramagnetism is due to the presence of:

A
One or more unpaired electrons

B
All paired electrons

C
Permanent spin and orbital motion

D
Permanent and anti-parallel spins in equal number

Solution

Paramagnetic materials have a small, positive susceptibility to magnetic fields. These materials are slightly attracted by a magnetic field and the material does not retain the magnetic properties when the external field is removed. Paramagnetic properties are due to the presence of some unpaired electrons, and from the realignment of the electron paths caused by the external magnetic field.
Question 2
4 / -1

Fe₃O₄ is ferrimagnetic at room temperature but at 850 K, it becomes:

A
Dimagnetic

B
Ferrimagnetic

C
Paramagnetic

D
Anti-ferromagnetic

Solution

At 850K, Fe₃O₄ becomes paramagnetic
Question 3
4 / -1

Which of the following metal oxides is antiferromagnetic in nature?

A
MnO₂

B
TiO₂

C
NO₂

D
CrO₂

Solution

MnO₂ is antiferromagnetic in nature.
Question 4
4 / -1

Ferrimagnetic is observed when the magnetic moments of the domains in the substance are?

A
Oppositely oriented and cancel each other's magnetic moment

B
Aligned in parallel and anti-parallel directions in unequal numbers

C
Randomly oriented and their magnetic moments get cancelled

D
In same direction and get aligned in magnetic field

Solution

A ferrimagnetic material is defined as one in which the magnetic dipole of the atoms on different sublattices are opposed as in antiferromagnetism but in ferrimagnetic materials, opposing moments are unequal and a spontaneous net magnetization remains.
Question 5
4 / -1

Match the column I with column II and mark the appropriate choice.

A
(A)→(iii), (B)→(i), (C)→(ii), (D)→(iv), (E)→(v)

B
(A)→(i), (B)→(ii), (C)→(iii), (D)→(iv), (E)→(v)

C
(A)→(iv), (B)→(i), (C)→(iii), (D)→(ii), (E)→(v)

D
(A)→(v), (B)→(iv), (C)→(iii), (D)→(ii), (E)→(i)

Solution

In ferromagnetic materials, When a magnetizing force is applied, the domains become aligned to produce a strong magnetic field within the part. So, its correct match is (iii).
A ferrimagnetic material is defined as one in which the magnetic dipole of the atoms on different sublattices are opposed as in antiferromagnetism but in ferrimagnetic materials, opposing moments are unequal and a spontaneous net magnetization remains. So, its correct match is (i)
These are materials in which electron spins associated with magnetic atoms at particular crystallographic sites are ordered yet oriented with respect to each other in such a manner that their net magnetization is equal to zero. So, its correct match is (ii).
Diamagnetic materials are those in which the electron motions are such that they produce net zero magnetic moment in the absence of any magnetic field. Typically these are atoms with closed or filled outer electron shells. So, its correct match is (iv).
Paramagnetic materials possess a permanent magnetic dipole moment due to incomplete cancellation of electron spin and orbital magnetic moment. So, its correct match is (v).