SECOND YEAR EXAMINATION. PHYSICS I. 1. How would you determine experimentally the Moment of Inertia of a body of irregular form round a given axis? State the necessary formulae and deduce the final equation giving the value of the required Moment of Inertia. 2. By what methods may the value of "g" at a given place be determined? Shew theoretically how an absolute value of "g " at a given place may be determined by observations with a compound pendulum. 3. Describe briefly, with historical references, but without formulae, and criticise the different methods by which the mass of the earth may be found. State and explain the formulae necessary in deducing the value of the earth's mass from the Cavendish experiment. 4. Describe, and fully explain an experiment for determining the rigidity of the material of a cylindrical wire. What fallacious extension of Coulomb's torsion formula has been made? 5. Describe the different forms of thermometers used in practice and discuss their relative merits. What scale of temperatures is adopted at the present time as the standard for accurate practical work? 6. Describe fully Rowland's experiments on the mechanical equivalent of heat. Compare the results as originally given with those obtained by Griffiths. How has later work modified the results of the work of each experimenter? PHYSICS II. 1. Give the argument leading to the conclusion that a scale of temperature may be framed which is independent of the properties of any particular substance. 2. Calculate the thermal effect of the sudden application of a pressure of 150 atmospheres to water at 0°C. Each step of the work must be explained, but the final equation need not be numerically simplified. The following may be assumed dt P 'do = t One atmosphere pressure equals 2117 pounds weight per square foot. One cubic foot of water weighs 62.5 pounds; Joule's equiva- For temperatures near the maximum density point the of maximum density, and the compressibility may be 3. Find the capacity per unit area of two infinite conducting planes when a slab of dielectric is placed between the planes, the faces of the slab being parallel to the planes. Find the force per unit area between the planes under the same circumstances. 4. Find the magnetic force at a point on the axis of a circular coil carrying a current. 5. In connection with the magnetisation of iron, explain fully the meaning of the terms "magnetic force," "intensity of magnetisation," and "magnetic induction." State the relation between the quantities, and shew how it may be obtained. 6. Describe, with full detail, any electrical experiment which you have carried out. GEOLOGY. PASS AND HONOURS. 1. What are the following, and what are their modes of origin and occurrence:-fulgurites, felspathoid rocks, bauxite, tasmanite, Lydian stone (basanite)? 2. Describe the chief varieties of (a) the Monoclinic Pyroxenes and (b) the Rhombic Pyroxenes; mention their chief optical and physical properties, and state the chief types of rock which they contribute to form. 3. Explain and illustrate with sketches the formation of an overthrust inlier ("Uberschiebung's-Klippen"). What various views have been advanced to explain overthrust faults? 4. What is the meaning of "persistent geological horizons," and of what use are they in field mapping? Quote some Australian examples. 5. What evidence is supplied by the bores near Adelaide as to the relation to one another in that neighbourhood of the Tertiary rocks? Mention a few of the most characteristic fossils in these rocks, and illustrate your answer with a section. 6. What is meant by "Order of Colour" of a mineral section under the microscope? 7. What is the nature and geological horizon of (a) the Burdekin Beds of Queensland, (b) the Collie's Creek Coalfield of West Australia, (c) the Lower Marine Beds of the Maitland District, N.S. Wales? Mention any fossils characteristic respectively of the above three horizons. 8. In the case of the granites of New England, N.S. Wales, many of the bosses have a superficial area of over a hundred square miles, and yet they have not forced up to the surface, so far as is known, any rocks older than Devonian. Explain and illustrate with sketches this phenomenon, quoting arguments for and against the views-(a) that the Pre-Devonian rocks in that neighbourhood have been dissolved and incorporated in the intrusive granite; (b) that they have been thrust aside or thrust downwards, and so have not been exposed to denudation. What evidence is there as to the approximate date of the intrusion of the bulk of the granites of New South Wales? MATHEMATICS. STATICS, as in the Second Year of Arts. DYNAMICS, DIFFERENTIAL AND INTEGRAL CALCULUS, as in the Third Year of Arts. CHEMISTRY (CARBON COMPOUNDS), as in the Second Year of Medicine, with a practical Examination of six hours. THIRD YEAR EXAMINATION. PALEONTOLOGY. PASS AND HONOURS. 1. Describe briefly the hard and soft parts of (a) the Ostracoda and (b) the Phyllopoda. Enumerate some important genera of each giving their geological range, and mention any localities in Australia where they occur. 2. What are the following and what are their geological rangesTurrilepas, Cornulites, Calymene, Streptelasma, Encrinus, Palæaster, Nodosaria, Astylospongia, Belemnites, Lunulites? 3. Describe in detail the shell of Trigonia, and state what are the chief distinguishing characteristics between a lamellibranch shell and that of a brachiopod. 4. Of what significance and classificatory value are the following-byssal notch, indented pallial line, retro-siphonate structure, pedal scar, hinge area, discontinuous suture? 5. Explain how certain of the brachiopods and lamellibranchs attach themselves permanently to foreign objects. Give examples. 6. On what geological horizons in Australia have remains of (a) fossil insects, and (b) Errant annelids been found? Mention the genera and species. 7. Describe briefly the most important organic rocks in Australia formed of remains of invertebrate animals. Give the localities and geological horizons of such rocks and state what animals have contributed to form them. |