Solid State MCQs With Answers
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The Solid State Class 12 Important Questions Very Short Answer Type
Question 1.
Which point defect in crystals does not alter the density of the relevant solid?
Answer:
Frenkel defect.
Question 2.
Which point defect in its crystal units alters the density of a solid?
Answer:
Schottky defect.
Question 3.
Which point defect in its crystal units increases the density of a solid?
Answer:
Metal excess defect increases the density of a solid. It is due to presence of extra cations in the interstitial sites.
Question 4.
How do metallic and ionic substances differ in conducting electricity?
Answer:
The electrical conductivity in metallic substances is due to free electrons while in ionic substances the conductivity is due to presence of ions.
Question 5.
Which point defect of its crystals decreases the density of a solid?
Answer:
Schottky defect.
Question 6.
What is the number of atoms in a unit cell of a face-centred cubic crystal?
Answer:
The number of atoms in a unit cell of fcc-crysta! is 4 atoms.
Question 7.
Write a feature which will distinguish a metallic solid from an ionic solid.
Answer:
The electrical conductivity in metallic solid is due to free electrons while in ionic solid the conductivity is due to presence of ions.
Question 8.
Which point defect in crystals of a solid does not change the density of the solid?
Answer:
Frenkel defect.
Question 9.
Which point defect in crystals of a solid decreases the density of the solid?
Answer:
Schottky defect.
Question 10.
What type of interactions hold the molecules together in a polar molecular solid?
Answer:
Dipole-dipole forces of attractions hold the molecules together in a polar molecular solid.