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GATE 2018 : Engineering Sciences [Section C / Materials Science] (with Final Answer Keys)

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GATE 2018 XE (C): Q.1 Materials Science (XE-C) Q. 1 Q. 9 carry one mark each & Q. 10 Q. 22 carry two marks each. The stress ratio for a completely reversed cyclic loading during a fatigue test is (A) 0 Q.2 (B) 1 (C) 1 (D) 1/2 Minimum symmetry that a cubic crystal must possess is (A) four 3-fold rotation axes. (B) three 4-fold rotation axes. (C) three orthogonal mirror planes. (D) centre of symmetry. Q.3 If a material is repelled in an external magnetic field then it is (A) Ferromagnetic (C) Paramagnetic Q.4 (B) Diamagnetic (D) Antiferromagnetic An electron makes a transition from the valence band to the conduction band in an indirect band gap semiconductor. Which one of the following is true? (A) Energy of the electron decreases. (B) A photon is emitted in the process. (C) A phonon is annihilated in the process. (D) A photon is created in the process. Q.5 Which one of the following is the characteristic of a screw dislocation? (A) Dislocation line and Burgers vector are parallel. (B) Direction of motion of dislocation is parallel to the Burgers vector. (C) Atomic displacement due to the movement of the dislocation is in the direction of the motion of the dislocation line. (D) It has a unique slip plane. Q.6 The number of vibrational degrees of freedom for a non-linear triatomic molecule are (A) 9 XE-C (B) 6 (C) 4 (D) 3 1/4

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