ESE Geology & Geophysics Questions

Q: In characteristics of cubic crystal, the planes and directions having the same indices are always at the angle of

Q: Consider the following statements regarding Face Centered Cubic Crystal Structure: 1. There are eight corner atoms, six face atoms and no interior atoms, then the number of atoms per unit are 6. 2. Coordination Number is 12. 3. Atomic packing factor is 0·74. 4. Volume of unit cell is V = 16R^3√2, where R is atomic radius. Which of the above statements are correct?

Q: In crystal materials, the equilibrium number of vacancies in crystalline solid increases

Q: In which one of the following dislocations, an extra portion of a plane of atoms or half plane, the edge of which terminates within the crystal?

Q: Consider the following statements regarding metallic bonding: 1. The metallic sharing changes with time and the bonding electrons resonate between different atoms. 2. The metallic state can be visualized as an array of positive ions, with a common pool of electrons to which all the metal atoms have contributed their outer electrons. 3. These electrons have freedom to move anywhere within the crystal and act like an all-pervasive, mobile glue holding the ion cores together. Which of the above statements are correct?

Q: Consider the following statements regarding phase diagram rules for the crystal: 1. According to the Gibbs phase rule, the degree of freedom, (F) = Number of components (C) + Number of Phases (P) + 2. 2. The tie-line rule is applied to determine the compositions of two co-existing phases in a binary phase diagram. 3. In the lever rule, the tie-line at the temperature of interest is treated as a lever arm, with the fulcrum at the overall composition. Which of the above statements are correct?

Q: Match the following lists: List I P. Lamarck Q. Lyell R. Malthus S. Wallace List II 1. Evolutionary theory 2. Gradual geological processes have gradually shaped Earth's surface 3. Human population grow faster than the resources they depend on 4. Inheritance of acquired characteristics Select the correct answer using the code given below: P Q R S

Q: When a pair of one cation and one anion are absent from an ionic crystal, then the defect is called

Q: Consider the following statements regarding Hydrogen Breakthrough Ironmaking Technology: 1. Swedish green steel venture HYBRIT, which had made the 'world's first' customer delivery of steel produced with using coal. 2. The steel was made using Hydrogen Breakthrough Ironmaking Technology, which uses 100% fossil-free hydrogen instead of coal and coke. 3. The venture has started delivering the fossil-free steel to the Volvo Group as part of its trial run. Which of the above statements is/are correct?

Q: If a pair of one cation and one anion is missing in an ionic crystal such that those pairs of ions are equal to maintain electrical neutrality, then that pair of vacant sites is called