The most efficient packing is present in -

1. HCP and BCC

2. HCP and CCP

3. BCC and CCP

4. BCC and Simple cubic cell

The coordination number of a square close-packed structure in two dimensions is -

1. 2

2. 3

3. 4

4. 6

Doping causes-

1. Dislocation defect.

2. Schottky defect.

3. Frenkel defect.

4. Electronic defect.

The incorrect statement among the following is:

A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field because:

The correct order of the packing efficiency in different types of unit cells is-

1.  Fcc < Bcc < Simple cubic

2.  Fcc > Bcc > Simple cubic

3.  Fcc < Bcc > Simple cubic

4.  Bcc < Fcc > Simple cubic

Correct statement among the following regarding conductivity in solids is -

1.   ${\mathrm{\kappa }}_{\mathrm{metals}}<mspace\; width="1em"></mspace>\gg <mspace\; width="1em"></mspace>{\mathrm{\kappa }}_{\mathrm{insulators}}<mspace\; width="1em"></mspace><<mspace\; width="1em"></mspace>{\mathrm{\kappa }}_{\mathrm{semiconductors}}$

2.   ${\mathrm{\kappa }}_{\mathrm{metals}}<mspace\; width="1em"></mspace>\ll <mspace\; width="1em"></mspace>{\mathrm{\kappa }}_{\mathrm{insulators}}<mspace\; width="1em"></mspace><<mspace\; width="1em"></mspace>{\mathrm{\kappa }}_{\mathrm{semiconductors}}$

3.   ${\mathrm{\kappa }}_{\mathrm{metals}}<mspace\; width="1em"></mspace>,<mspace\; width="1em"></mspace>{\mathrm{\kappa }}_{\mathrm{semiconductors}}<mspace\; width="1em"></mspace>><mspace\; width="1em"></mspace>{\mathrm{\kappa }}_{\mathrm{insulators}}<mspace\; width="1em"></mspace>=<mspace\; width="1em"></mspace>\mathrm{zero}$

4.  ${\mathrm{\kappa }}_{\mathrm{metals}}<mspace\; width="1em"></mspace><<mspace\; width="1em"></mspace>{\mathrm{\kappa }}_{\mathrm{semiconductors}}<mspace\; width="1em"></mspace>><mspace\; width="1em"></mspace>{\mathrm{\kappa }}_{\mathrm{insulators}}<mspace\; width="1em"></mspace>\ne <mspace\; width="1em"></mspace>\mathrm{zero}$

Match the defects given in Column I with the statements given in Column II.

Codes

Match the types of defects given in Column I with the statement given in Column II.

Codes

Match the items given in Column I with the items given in Column II.

Codes