166 questions from this paper (of the 196 we have; questions we could not answer reliably are left out) in the paper's order. Answers come from our checked MCQ bank or, where the paper had no answer key, from an AI check: confirm with the commission's official key.
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First questions
Consider the following statements regarding Miller indices and symmetry: 1. Miller indices (hkl) represent a plane that is parallel to the c-axis if l = 0. 2. The law of rational indices states that the intercepts of crystal faces are always small integers. 3. A form is a set of symmetry-equivalent faces identified by braces {hkl}. Which of the statements given above are correct?
Consider the following statements regarding Pauling’s Rules: 1. The Coordination Principle states that the cation-anion distance is the sum of their radii. 2. The Electrostatic Valency Principle suggests that an ionic structure is stable when the sum of bond strengths equals the anion charge. 3. The Principle of Parsimony implies that the number of different types of constituents in a crystal tends to be large. Which of the statements given above is/are correct?
Which of the following optical properties characterize(s) a 'uniaxial negative' mineral? 1. The refractive index of the ordinary ray (ω) is greater than the extraordinary ray (∈). 2. The mineral shows a length-fast (negative) sign of elongation. 3. The interference figure shows isogyres that move apart as the stage is rotated. Select the correct answer using the code given below:
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