201. Line imperfection in a crystal is called:

1. 1. Schottky defect

   
   
   

   2. Frenkel defect

   
   
   

   3. Edge dislocation

   
   
   

   4. Miller defect

   
   
   

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   Line imperfection in a crystal is called edge dislocation.

   Correct Option: C

   Line imperfection in a crystal is called edge dislocation.

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202. Resistivity of electrical conductors is most affected by:

1. 1. temperature

   
   
   

   2. pressure

   
   
   

   3. composition

   
   
   

   4. All of these

   
   
   

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   Resistivity of electrical conductors is most affected by temperature.

   Correct Option: A

   Resistivity of electrical conductors is most affected by temperature.

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203. Dislocations in materials are:

1. 1. point defect

   
   
   

   2. line defect

   
   
   

   3. planer defect

   
   
   

   4. surface defects

   
   
   

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   Dislocations in materials are line defect.

   Correct Option: B

   Dislocations in materials are line defect.

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204. Semiconductors have electrical conductivities of the following order (ohm-cm–1):

1. 1. 10^{- 15}

   
   
   

   2. 10^{- 3}

   
   
   

   3. 10⁴

   
   
   

   4. 10¹⁰

   
   
   

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   NA

   Correct Option: B

   NA

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205. The electronic configuration of an iron atom is:

1. 1. 1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁶, 4s²

   
   
   

   2. 1s², 2s², 2p⁶, 3s², 3p⁶, 3d³, 4s²

   
   
   

   3. 1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁸, 4s²

   
   
   

   4. None of the above

   
   
   

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   NA

   Correct Option: A

   NA

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