271. The interplanar distance in a cubic crystal is equal to the length of the cube. Miller indices of the related plane will be:

1. 1. (100)

   
   
   

   2. (110)

   
   
   

   3. 
      (10 1)

   
   
   

   4. (200)

   
   
   

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   NA

   Correct Option: A

   NA

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272. The [110] direction in a cubic unit cell is parallel to:

1. 1. face diagonal of unit cell

   
   
   

   2. edge of the cube

   
   
   

   3. body diagonal of the cube

   
   
   

   4. none of the above

   
   
   

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   NA

   Correct Option: B

   NA

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273. A crystalline solid has all similar atoms relative to neighbouring atoms in:

1. 1. periodical positions

   
   
   

   2. reversed positions

   
   
   

   3. random fluctuating position

   
   
   

   4. similar positions

   
   
   

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   A crystalline solid has all similar atoms relative to neighbouring atoms in similar positions.

   Correct Option: D

   A crystalline solid has all similar atoms relative to neighbouring atoms in similar positions.

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274. The Miller indices of a plane are proportional to:

1. 1. the reciprocal of numerical parameters of the intercepts

   
   
   

   2. the square of unit cell dimensions

   
   
   

   3. the intercepts of the planes on the coordinate axes

   
   
   

   4. interplanar spacing

   
   
   

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   The Miller indices of a plane are proportional to the reciprocal of numerical parameters of the intercepts.

   Correct Option: A

   The Miller indices of a plane are proportional to the reciprocal of numerical parameters of the intercepts.

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275. A primitive cell is:

1. 1. the cell containing smallest group of atoms randomly

   
   
   

   2. an unit cell in which lattice points are located only at its corners

   
   
   

   3. a basic building block of a crystal

   
   
   

   4. an unit cell of end centred monoclinic crystal

   
   
   

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   Primitive cell is an unit cell in which lattice points are located only at its corners.

   Correct Option: B

   Primitive cell is an unit cell in which lattice points are located only at its corners.

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