Chapter 1: Solid State

Q48Written answer

Which of the following statements is correct?

(i) Ferrimagnetic substances lose ferrimagnetism on heating and become

paramagnetic.

(ii) Ferrimagnetic substances do not lose ferrimagnetism on heating and

remain ferrimagnetic.

(iii) Antiferromagnetic substances have domain structures similar to

ferromagnetic substances and their magnetic moments are not cancelled

by each other.

(iv) In ferromagnetic substances, all the domains get oriented in the direction

of the magnetic field and remain as such even after removing the magnetic field.

Show solutionHide solution

Worked solution

Option (i) and (iv) are the answers.

Q49Written answer

Which of the following features are not shown by quartz glass?

(i) This is a crystalline solid.

(ii) Refractive index is the same in all directions.

(iii) This has a definite heat of fusion.

(iv) This is also called supercooled liquid.

Show solutionHide solution

Worked solution

Option (i) and (iii) are the answers.

Q50Written answer

Which of the following cannot be regarded as a molecular solid?

(i) SiC (Silicon carbide)

(ii) AlN

(iii) Diamond

(iv) I₂

Show solutionHide solution

Worked solution

Option (i), (ii) and (iii) are the answers.

Q51Written answer

In which of the following arrangements are octahedral voids formed?

(i) hcp

(ii) bcc

(iii) simple cubic

(iv) fcc

Show solutionHide solution

Worked solution

Option (i) and (iv) are the answers.

Q52Written answer

Frenkel defect is also known as ________.

(i) stoichiometric defect

(ii) dislocation defect

(iii) impurity defect

(iv) non-stoichiometric defect

Show solutionHide solution

Worked solution

Option (i) and (ii) are the answers.

Q53Written answer

Which of the following defects decreases the density?

(i) Interstitial defect

(ii) Vacancy defect

(iii) Frankel defect

(iv) Schottky defect

Show solutionHide solution

Worked solution

Option (ii) and (iv) are the answers.

III. Short Answer Type

Q54Written answer

Why are liquids and gases categorised as fluids?

Show solutionHide solution

Worked solution

They both have the property to flow. The molecules of liquid and gas can move fast from one to another. That is why they are categorized as fluids.

Q55Written answer

Why are solids incompressible?

Show solutionHide solution

Worked solution

Solids are incompressible because their intermolecular distance between the molecules is very less. There will be a large repulsive force between the electron clouds.

Q56Written answer

Despite long-range order in the arrangement of particles, why are the crystals usually not perfect?

Show solutionHide solution

Worked solution

The crystallization process will be faster, so the particle may not get enough time to arrange in perfect order. That is why crystals have a long-range arrangement of particles but are not perfect.

Q57Written answer

Why does table salt, NaCl, sometimes appear yellow?

Show solutionHide solution

Worked solution

This is due to the metal excess defect. The unpaired electrons get trapped in anion vacancies. When the electrons absorb energy, it gets excited and falls on the crystals. Thus the colour becomes yellow.

My Cart

Your Cart 0

II. Multiple Choice Questions (Type-II)