TS EAPCET (Engineering) Solid State — practice questions
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Practice TS EAPCET (Engineering) Solid State in the app →Crystalline solids are characterised by:Which of the following arrangements is in correct order of increasing electronegativity (Pauling scale)?**Crystalline solids** typically have:There are **fourteen** distinct types of three-dimensional space lattices, called:The number of crystal systems is:Cubic system has how many distinct Bravais lattices?The density of a cubic crystal is given by:A **simple cubic** unit cell has effective number of particles:A **body-centred cubic (bcc)** unit cell has effective number of particles:A **face-centred cubic (fcc)** unit cell has effective number of particles:Each **corner** particle of a cubic unit cell is shared by how many neighbouring cubes?Each **face-centre** particle of a cubic unit cell is shared by how many cubes?Each **edge-centre** particle of a cubic unit cell is shared by how many cubes?**Coordination number** of a particle in a simple cubic (sc) lattice is:**Coordination number** of a particle in a body-centred cubic (bcc) lattice is:**Coordination number** of a particle in a face-centred cubic (fcc) lattice is:**Hexagonal close-packed (hcp)** structure has coordination number:Gold crystallises in the fcc structure with edge length 408 pm. Its density is (M = 197 g/mol, $N_A = 6.022 \tThe relationship between **edge length $a$** and **atomic radius $r$** in a **face-centred cubic (fcc)** unit The relationship between **edge length $a$** and **atomic radius $r$** in a **body-centred cubic (bcc)** unit **Packing efficiency** of fcc (and hcp) close-packed structures is:Packing efficiency of a simple cubic (sc) structure is:The ratio of **tetrahedral voids** to **atoms** in a close-packed structure (fcc or hcp) is:The ratio of **octahedral voids** to **atoms** in a close-packed structure is:Which property marks crystalline solids but not amorphous ones?A solid has the same refractive index in all directions. Which one is it?Amorphous solids are often described as which of the following?The substances NaF and MgO show the same crystal structure and the same atomic ratio. They are called what?Calcite and aragonite are two crystalline forms of calcium carbonate. This phenomenon is called what?Polymorphism shown by an element, as in diamond, graphite and fullerene, is known by which name?Why are covalent network solids poor conductors of electricity?Which statement about ionic crystals is correct?When is an ionic solid such as NaCl a good conductor of electricity?What type of force holds the particles of an ionic crystal together?Which of the following forms a molecular crystal on solidification?Why are molecular solids usually soft with low melting points?Solid CH4 and solid H2 are held together by which forces?Metallic crystals are often described as an array of positive ions in what?A metal can be drawn into wires. This property is called what?The constituent particles attached to each lattice point of a crystal are collectively called what?In a primitive unit cell, where are the constituent particles located?A unit cell that has particles at the corners and one at the centre of the body is called what?A base-centred unit cell has particles at the corners and where else?How many distinct space lattices (Bravais lattices) are possible in three dimensions?The fourteen Bravais lattices are grouped into how many crystal systems?How many Bravais lattices belong to the cubic crystal system?In a cubic lattice, each corner particle is shared among how many unit cells?In a cubic unit cell, a particle at the centre of a face is shared by how many cells?How many particles belong to one simple cubic unit cell?An fcc unit cell has eight corner particles and six face-centre particles. How many particles belong to it?Gold crystallises in an fcc cell with edge 408 pm and molar mass 197 g/mol. Its density is closest to what?Which expression gives the density of a cubic crystal with n particles per cell, molar mass M and edge a?In square close packing in two dimensions, each sphere touches how many neighbours?Which metal crystallises in the simple cubic structure?The coordination number of each sphere in hcp and ccp structures is what?How many tetrahedral voids are associated with each atom in an hcp or ccp structure?In an hcp or ccp structure of N atoms, how many octahedral voids are present?What percentage of the volume of a bcc lattice is empty space?The packing efficiency of fcc, ccp and hcp lattices is about what?What does the coordination number of an atom in a bcc lattice equal?In a Schottky defect, what is missing from the lattice?How does a Schottky defect affect the density of an ionic solid?A Frenkel defect arises when an ion does what?Which ionic compound is known for showing Frenkel defect?What happens to the density of a crystal with Frenkel defects?A vacancy defect in a crystal lowers its density because what happens?Crystallisation at a slower rate has what effect on crystal defects?Heating NaCl in sodium vapour gives it a colour because of which defect?A solid with conductivity of 10^5 ohm^-1 m^-1 is classified as which type?Silicon and germanium are examples of which class of solids by conductivity?Doping silicon with phosphorus gives which type of semiconductor?Which dopant makes germanium a p-type semiconductor?Solids with unpaired electrons that are weakly attracted by a magnetic field are called what?How many lattice points does one body-centred cubic unit cell contain in total?A face-centred cubic unit cell has how many lattice points in total?Which cubic lattice has an atomic packing factor of about 0.740?Each sphere in a simple cubic lattice has a coordination number of what value?Which element is cited as a rare example of the primitive cubic structure?What is the packing efficiency of a body-centred cubic lattice, roughly?Which elements can adopt the diamond cubic structure along with carbon?In the caesium chloride structure, what is the coordination number of each ion?The rock-salt structure shows what coordination around each ion?A cation to anion radius ratio of 0.414 to 0.732 favours which structure?What is the cation to anion ratio in the fluorite structure?Removing the chloride ions from NaCl leaves sodium ions in which arrangement?Which compound is an example of the caesium chloride type structure?Which kind of defect is a Frenkel pair?A lattice site that should hold an atom in a perfect crystal but is empty is called what?An atom sitting where no atom normally belongs in the lattice is which defect?An impurity atom incorporated at a regular atomic site is called what kind of defect?Which small impurity atom can sit in the gaps of palladium without high energy?Atoms of different types exchanging positions in an ordered alloy produce which defect?Into which four broad classes are crystal defects commonly grouped?A dangling bond in amorphous silica is an example of what?