31. The overall electrical neutrality is maintained in:

1. 1. Frenkel’s defect

   
   
   

   2. screw dislocation

   
   
   

   3. low angle boundary defect

   
   
   

   4. none of the above

   
   
   

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   NA

   Correct Option: A

   NA

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32. Volume imperfections can be of the type of:

1. 1. Schottky’s defect

   
   
   

   2. twin

   
   
   

   3. stacking fault

   
   
   

   4. noncrystalline regions

   
   
   

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   Volume imperfections can be of the type of noncrystalline regions

   Correct Option: D

   Volume imperfections can be of the type of noncrystalline regions

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33. The imperfections may be minimized by:

1. 1. thermal energy

   
   
   

   2. making metal in fibre form

   
   
   

   3. surface treatment

   
   
   

   4. All of these

   
   
   

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   The imperfections can be minimized by thermal energy.

   Correct Option: A

   The imperfections can be minimized by thermal energy.

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34. Influence of dislocations on mechanical strength of a crystal is to:

1. 1. increase it

   
   
   

   2. keep it uniform

   
   
   

   3. decrease it

   
   
   

   4. None of these

   
   
   

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   NA

   Correct Option: C

   NA

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35. In ‘plasma’ state a gas:

1. 1. loses electrical conductivity

   
   
   

   2. attracts moisture

   
   
   

   3. becomes perfect dielectric medium

   
   
   

   4. conducts electricity

   
   
   

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   In ‘plasma’ state a gas conducts electricity.

   Correct Option: D

   In ‘plasma’ state a gas conducts electricity.

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