Question 51. One of the legacies of the Roman legions was discipline. In the legions, military law prevailed
and discipline was brutal. Discipline on the battlefield kept units obedient, intact and fighting,
even when the odds and conditions were against them. Which one of the following statements best sums up the meaning of the above passage?

Question 52. and B are friends. They decide to meet between 1 PM and 2 PM on a given day. There is a
condition that whoever arrives first will not wait for the other for more than 15 minutes. The
probability that they will meet on that day is

Question 53. If d is the inter-planar spacing of the planes {h k l}, the inter-planar spacing of the planes
{nh nk nl}, n being an integer, is

Question 54. The property of a material that CANNOT be significantly changed by heat treatment is

Question 55. As temperature increases, the electrical resistivities of pure metals (ρm) and intrinsic
semiconductors (ρs) vary as follows

Question 56. At equilibrium spacing in a crystalline solid, which of the following is true for net inter-atomic
force (F) and potential energy (U)

Question 57. A polymer matrix composite is reinforced with long continuous ceramic fibres aligned in one
direction. The Young's moduli of the matrix and fibres are Em and Ef respectively, and the volume
fraction of the fibres is f. Assuming iso-stress condition, Young's modulus of the composite EC in a
direction perpendicular to the length of fibres, is given by the expression

Question 58. The riser is designed such that the melt in the riser solidifies

Question 59. Which of the following is NOT a fusion welding process?

Question 60. Radiography technique of detecting defects is based on the principle of