Class XII

A group of 14 element is converted into n – type semiconductor by dopping it with
  1. group 16 elements
  2. group 17 elements
  3. group 15 elements
  4. Group 14 elements
Which is true for F – centers?
  1. Decreases density of the substance
  2. Creates vacancy
  3. Imparts colour to the crystal
  4. Density of the substance increases
Semi conductors have conductivity (in ohm− 1m− 1ohm− 1m− 1) in the range of
  1. 10–20to104
  2. 10–20to10–10
  3. 10–6to104
  4. 104to107
Which of the following lattices has the highest packing efficiency?
  1. Body centered cubic
  2. Hexagonal close packed
  3. Simple cubic
  4. Primitive cubic
Which among the following is not an example of amorphous solids?
  1. Quartz
  2. Glass
  3. Plastic
  4. Coke
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