JEE Main & Advanced Physics Semiconducting Devices Question Bank

done Solids and Crystals Total Questions - 28

• question_answer1)
  The nature of binding for a crystal with alternate and evenly spaced positive and negative ions is [CBSE PMT 2000]
  A)
             Covalent                                 done clear
  B)
             Metallic done clear
  C)
             Dipolar                                     done clear
  D)
             Ionic done clear
  View Solution play_arrow

• question_answer2)
  For a crystal system, a = b = c, a = b = g  ¹ 90o, the system is                                         [BHU 2000]
  A)
             Tetragonal system              done clear
  B)
             Cubic system done clear
  C)
             Orthorhombic system       done clear
  D)
             Rhombohedral system done clear
  View Solution play_arrow

• question_answer3)
  Biaxial crystal among the following is                  [Pb. CET 1998]
  A)
             Calcite                                      done clear
  B)
             Quartz done clear
  C)
             Selenite                                  done clear
  D)
             Tourmaline done clear
  View Solution play_arrow

• question_answer4)
  The temperature coefficient of resistance of a conductor is  [AFMC 1998]
  A)
             Positive always                    done clear
  B)
             Negative always done clear
  C)
             Zero                                          done clear
  D)
             Infinite done clear
  View Solution play_arrow

• question_answer5)
  Potassium has a bcc structure with nearest neighbour distance 4.525 Å. Its molecular weight is 39. Its density in kg/m3 is                                                                                     [DCE 1997]
  A)
             900 done clear
  B)
             494 done clear
  C)
             602 done clear
  D)
             802 done clear
  View Solution play_arrow

• question_answer6)
  The expected energy of the electrons at absolute zero is called                                                 [RPET 1996]
  A)
             Fermi energy                        done clear
  B)
             Emission energy done clear
  C)
             Work function                      done clear
  D)
             Potential energy done clear
  View Solution play_arrow

• question_answer7)
  In a triclinic crystal system                          [EAMCET (Med.) 1995]
  A)
             \[a\ne b\ne c\], \[\alpha \ne \beta \ne \gamma \] done clear
  B)
             \[a=b=c\], \[\alpha \ne \beta \ne \gamma \] done clear
  C)
             \[a\ne b\ne c\], \[\alpha \ne \beta =\gamma \]       done clear
  D)
             \[a=b\ne c\], \[\alpha =\beta =\gamma \] done clear
  View Solution play_arrow

• question_answer8)
  Metallic solids are always opaque because        [AFMC 1994]
  A)
             Solids effect the incident light done clear
  B)
             Incident light is readily absorbed by the free electron in a metal done clear
  C)
             Incident light is scattered by solid molecules done clear
  D)
             Energy band traps the incident light done clear
  View Solution play_arrow

• question_answer9)
  In which of the following ionic bond is present [EAMCET (Med.) 1994]
  A)
             NaCl                                         done clear
  B)
             Ar done clear
  C)
             Si    done clear
  D)
             Ge done clear
  View Solution play_arrow

• question_answer10)
  Which of the following materials is non crystalline [CBSE PMT 1993]
  A)
             Copper                                    done clear
  B)
             Sodium chloride done clear
  C)
             Wood                                       done clear
  D)
             Diamond done clear
  View Solution play_arrow

• question_answer11)
  The coordination number of \[Cu\] is                    [AMU 1992]
  A)
             1     done clear
  B)
             6                                                                                                                  done clear
  C)
             8     done clear
  D)
             12 done clear
  View Solution play_arrow

• question_answer12)
  Which one of the following is the weakest kind of bonding in solids         [CBSE PMT 1992; KCET 1992]
  A)
             Ionic                                         done clear
  B)
             Metallic done clear
  C)
             Vander Waals                       done clear
  D)
             Covalent done clear
  View Solution play_arrow

• question_answer13)
  In a crystal, the atoms are located at the position of [AMU 1985]
  A)
             Maximum potential energy   done clear
  B)
             Minimum potential energy done clear
  C)
             Zero potential energy done clear
  D)
             Infinite potential energy done clear
  View Solution play_arrow

• question_answer14)
  Crystal structure of \[NaCl\] is                                [NCERT 1982]
  A)
             Fcc done clear
  B)
             Bcc done clear
  C)
             Both of the above              done clear
  D)
             None of the above done clear
  View Solution play_arrow

• question_answer15)
  What is the coordination number of sodium ions in the case of sodium chloride structure             [CBSE PMT 1988]
  A)
             6     done clear
  B)
             8 done clear
  C)
             4     done clear
  D)
             12 done clear
  View Solution play_arrow

• question_answer16)
  The distance between the body centred atom and a corner atom in sodium \[(a=4.225{AA})\] is          [CBSE PMT 1995]
  A)
  \[3.66\,{AA}\]                     done clear
  B)
  \[3.17\,{AA}\] done clear
  C)
  \[2.99\,{AA}\]                     done clear
  D)
  \[2.54\,{AA}\] done clear
  View Solution play_arrow

• question_answer17)
  A solid that transmits light in visible region and has a very low melting point possesses                   [J & K CET 2001]
  A)
             Metallic bonding                 done clear
  B)
             Ionic bonding done clear
  C)
             Covalent bonding                    done clear
  D)
             Vander Waal?s bonding done clear
  View Solution play_arrow

• question_answer18)
  Atomic radius of fcc is                                            [J & K CET 2001]
  A)
             \[\frac{a}{2}\]                       done clear
  B)
             \[\frac{a}{2\sqrt{2}}\] done clear
  C)
             \[\frac{\sqrt{3}}{4}a\] done clear
  D)
             \[\frac{\sqrt{3}}{2}a\] done clear
  View Solution play_arrow

• question_answer19)
  A solid reflects incident light and it?s electrical conductivity decreases with temperature. The binding in this solids
  A)
             Ionic                                         done clear
  B)
             Covalent done clear
  C)
             Metallic done clear
  D)
             Molecular done clear
  View Solution play_arrow

• question_answer20)
  The laptop PC?s modern electronic watches and calculators use the following for display
  A)
             Single crystal                         done clear
  B)
             Poly crystal done clear
  C)
             Liquid crystal                         done clear
  D)
             Semiconductors done clear
  View Solution play_arrow

• question_answer21)
  The nearest distance between two atoms in case of a bcc lattice is equal to                                         [J & K CET 2004]
  A)
             \[a\frac{\sqrt{2}}{3}\]       done clear
  B)
             \[a\frac{\sqrt{3}}{2}\] done clear
  C)
             \[q\sqrt{3}\]                         done clear
  D)
             \[\frac{a}{\sqrt{2}}\] done clear
  View Solution play_arrow

• question_answer22)
  What is the net force on a Cl? placed at the centre of the bcc structure of CsCl                    [DCE 2003; AIIMS 2004]
  A)
             Zero                                          done clear
  B)
             \[k{{e}^{2}}/{{a}^{2}}\] done clear
  C)
             \[k{{e}^{2}}{{a}^{2}}\]      done clear
  D)
             Data is incomplete done clear
  View Solution play_arrow

• question_answer23)
  Sodium has body centred packing. If the distance between two nearest atoms is \[3.7{AA}\], then its lattice parameter is  [Pb. PET 2002]
  A)
  \[4.8\,{AA}\]                       done clear
  B)
  \[4.3\,{AA}\] done clear
  C)
  \[3.9\,{AA}\]                       done clear
  D)
  \[23.3\,{AA}\] done clear
  View Solution play_arrow

• question_answer24)
  Which of the following is an amorphous solid   [AIIMS 2005; J & K CET 2004]
  A)
             Glass                                        done clear
  B)
             Diamond done clear
  C)
             Salt                                            done clear
  D)
             Sugar done clear
  View Solution play_arrow

• question_answer25)
  Copper has face centered cubic (fcc) lattice with interatomic spacing equal to \[2.54{AA}\]. The value of the lattice constant for this lattice is     [CBSE PMT 2005]
  A)
  \[1.27\,{AA}\]                                done clear
  B)
  \[5.08\,{AA}\] done clear
  C)
  \[2.54\,{AA}\]                                done clear
  D)
  \[3.59\,{AA}\]                                done clear
  View Solution play_arrow

• question_answer26)
  In good conductors of electricity, the type of bonding that exists is                                                               [CBSE PMT 1995]
  A)
             Ionic                                         done clear
  B)
             Vander Waals done clear
  C)
             Covalent                                 done clear
  D)
             Metallic done clear
  View Solution play_arrow

• question_answer27)
  Bonding in a germanium crystal (semi- conductor) is [CPMT 1986; KCET 1992; EAMCET (Med.) 1995; MP PET/PMT 2004]
  A)
             Metallic                                   done clear
  B)
             Ionic done clear
  C)
             Vander Waal's type            done clear
  D)
             Covalent done clear
  View Solution play_arrow

• question_answer28)
  The ionic bond is absent in                                   [J & K CET 2005]
  A)
             NaCl                                         done clear
  B)
             CsCl done clear
  C)
             LiF done clear
  D)
             \[{{H}_{2}}O\] done clear
  View Solution play_arrow