PYQSide ExamsMy practice

Solid State · Question 33

AIPMT 2008MCQEasy📈 Topic in 0% papers+4−1
1

With which one of the following elements silicon should be doped so as to give p-type of semiconductor?

  1. Selenium
  2. Boron
  3. Germanium
  4. Arsenic

Answer

(2) Boron

Solution

As per NCERT, when silicon (group 14) is doped with a group 13 element such as B, Al or Ga, which has only three valence electrons, an electron hole is created at the site of the fourth bond.

⇒ Conduction takes place through these holes (positive), giving a p-type semiconductor.

∵ As (group 15) gives n-type, Ge (group 14) gives no extra carriers, and Se (group 16) is not an acceptor,

∴ Boron gives p-type silicon.

Answer: (2)

Out of syllabusAIPMT 2008

Keep practising — Solid State

2

If a stands for the edge length of the cubic systems: simple cubic, body centred cubic and face centred cubic, then the ratio of radii of the spheres in these systems will be respectively

  1. 12a : 32a : 22a
  2. 1a : 3a : 2a
  3. 12a : 34a : 12 2a
  4. 12a : 3a : 1 2a
Out of syllabusAIPMT 2008
3

For a cubic crystal structure which one of the following relations indicating the cell characteristics is correct?

  1. a b c and = = = 90
  2. a = b = c and = 90
  3. a = b = c and = = = 90
  4. a b c and and = 90
AIPMT 2007
4

The fraction of total volume occupied by the atoms present in a simple cubic unit cell is

  1. 3 2
  2. 4 2
  3. 4
  4. 6
Out of syllabusAIPMT 2007
5

If NaCl is doped with 10-4 mol% of SrCl2, the concentration of cation vacancies will be (NA = 6.02 1023 mol-1)

  1. 6.02 1016 mol-1
  2. 6.02 1017 mol-1
  3. 6.02 1014 mol-1
  4. 6.02 1015 mol-1
Out of syllabusAIPMT 2007
6

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

  1. interstitial positions
  2. F-centres
  3. Schottky defect
  4. Frenkel defect
Out of syllabusAIPMT 2006
7

CsBr crystallises in a body centered cubic lattice. The unit cell length is 436.6 pm. Given that the atomic mass of Cs = 133 and that of Br = 80 amu and Avogadro number being 6.02 1023 mol-1, the density of CsBr is

  1. 4.25 g/cm3
  2. 42.5 g/cm3
  3. 0.425 g/cm3
  4. 8.25 g/cm3
Out of syllabusAIPMT 2006
8

Copper has face centered cubic (fcc) lattice with interatomic spacing equal to 2.54 A. The value of lattice constant for this lattice is

  1. 2.54 A
  2. 3.59 A
  3. 1.27 A
  4. 5.08 A
AIPMT 2005
9

In a face-centered cubic lattice, a unit cell is shared equally by how many unit cells?

  1. 2
  2. 4
  3. 6
  4. 8
Out of syllabusAIPMT 2005
10

A compound formed by elements X and Y crystallizes in a cubic structure in which the X atoms are at the corners of a cube and the Y atoms are at the face-centers. The formula of the compound is :-

  1. XY3
  2. X3Y
  3. XY
  4. XY2
Out of syllabusAIPMT 2004
11

The pyknometric density of sodium chloride crystal is 2.165 103 kg m-3 while its X-ray density is 2.178 103 kg m-3. The fraction of unoccupied sites in sodium chloride crystal is

  1. 5.96
  2. 5.96 10-2
  3. 5.96 10-1
  4. 5.96 10-3
Out of syllabusAIPMT 2003

All Solid State PYQs →

PDFDownload Solid State PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All NEET Chemistry chapters
Physical ChemistrySome Basic Concepts of ChemistryStructure of AtomStates of MatterThermodynamicsEquilibriumRedox ReactionsSolid StateSolutionsElectrochemistryChemical KineticsSurface Chemistry
Inorganic ChemistryClassification of Elements and Periodicity in PropertiesChemical Bonding and Molecular StructureHydrogens-Block Elementsp-Block Elements (Group 13 & 14)Environmental ChemistryGeneral Principles of Isolation of Elementsp-Block Elements (Group 15–18)d- and f-Block ElementsCoordination Compounds
Organic ChemistryOrganic Chemistry – Some Basic Principles and TechniquesIsomerismHydrocarbonsHaloalkanes and HaloarenesAlcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAminesBiomoleculesPolymersChemistry in Everyday LifePrinciples Related to Practical Chemistry