Solid State NIOS Intext Questions With Answer
National Institute of Open Schooling (NIOS)
Sr. Secondary, Module-3
Lession-6: Solid State NIOS Intext Questions With Answer
INTEXT QUESTIONS 6.1
1. Differentiate between solid, liquid and gaseous state.
Answer: Solids have definite volume and definite shape due to their rigid structure.Liquids have define volume but indefinite shape and can take the shape of the container in which it is stored.
Gases have indefinite volume and indefinite shape.
2. How are solids classified on the basis of the intermolecular forces.
Answer: Solids may be classify on the basis of Coulombic forces, dipole-dipole attractions, covalent bonding and metallic bonding3. What is Steno's law of constancy of interfacial angles?
Answer: Crystals consist of more than one face and when these faces form an angle between them, those are said to be interfacial angles. Those interfacial angle between a pair of faces is always the same whether the size and shape changes of the given crystals.The law is also called the law of constancy of interfacial angles, holds for any two crystals, regardless of size, locality of occurrence, or whether they are natural or man-made.
INTEXT QUESTIONS 6.2
1. What is the difference between the square close packed and hexagonal close packed structures?
Answer: Square close packed and hexagonal close packed structures are a type of two dimensional close packing of crystalline solids. The difference between a square close packing and hexagonal close packing is that hexagonal close packing has better packing efficiency i.e. lesser void and the coordination number is six.2. Which of the above two, is more efficient way of packing?
Answer: Hexagonal close packing has better packing efficiency than square close packing because the size of the void is smaller comparatively.3. Clearly differentiate between, trigonal, tetrahedral and octahedral voids.
Answer: Trigonal voids are created in a two dimensional space by three solid spheres which are in the same plane.Tetrahedral voids are created in a three dimensional space where three solid spheres are in the same plane and the other is in top or bottom of the void created by the three solid spheres being in the same plane.
Octahedral voids are also seen in three dimensional space which is formed by six solid spheres where three of the solid spheres are placed above or below the void created by the three solid spheres.
