ThePrismSolutions

ThePrismSolutions

DAILY PRACTICE PAPER(8Th June 2018)

Q. To get n-type doped semiconductor, the impurity to be added to silicon should have the following number of valence electrons ?

(a) 2      (b) 5

(c) 3      (d) 1

Q. How many unit cells are present in a cube shaped ideal crystal of NaCl of mass 1.0 g ? :

(a)  5.14 X 1021      (b) 1.28 X 1021

(c)  1.71 X 1021      (d) 2.57 X 1021

Q. The crystal system of a compound with unit cell dimensions, a = 0.387, b = 0.387 and c = 0.504 nm and α = β= 90° and γ = 120° is :

(a)  cubic            (b)  hexagonal

(c)  orthorhombic      (d) rhombohedral

Q. If Z is the number of atoms in the unit cell that represents the closest packing sequence ABCABC......., the number of tetrahedral voids in the unit cell is equal to :

(a) Z          (b) 2Z          

(c) Z/2        (d) Z/4

Q. The appearance of colour in solid alkali metal halides is generally due to :

(a) Schottky defect         (b) Frenkel defect    

(c) Interstitial position      (d) F-centres



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