Question

A screw, dislocation        

1.   lies parallel to its Burger’s vector

2.   lies perpendicular to its Burger’s vector

3.   Moves in a perpendicular direction to the Burger’s vector

4. Moves in an inclined direction to the Burger’s vector

Select the correct answer using the codes given below :

(a) 1 and 4                      (b) 1 and 3

(c) 2 and 3                      (d) 2 and 4