XIX. EXAMINATION FOR THE DEGREE OF L.C.E. EXAMINERS. ... ... } In Physics. .. The Rev. F. X. HAAN, S.J. In Mining and Geology. } In Engineering and Architectur; In Metallurgy. In Forestry. : In Mechanical Engineering. SATURDAY, 23RD NOVEMBER, PHYSICS SECTION 1. 1. Distinguish between intensity of illumination and illuminating power. 10 Show that when a Bunsen photometer is properly adjusted, the illuminating powers of the two lights are directly as the squares of their distances from the photometer screen. 2. Describe a method of measuring small rotational movements by 10 means of a mirror. If the incident ray is fixed in direction, what is the relation between the angular motion of the reflected ray and that of the mirror ? Prove the correctness of your statement. 3. Describe the reflection of a plane wave front, perpendicular to the 10 axis of a concave parabolic mirror. Find the position, and the magnification, of the image of a scale placed 6 cm. from a concave mirror, the radius of curvature of which is 20 cm. Draw diagrams. 4. How can the refractive index of a convex lens be determined ? Prove 10 the formula made use of. SECTION II. 5. Explain the molecular theory of magnetism, Ampere's theory of mole- 12 cular currents and the two-fluid-theory of magnetism, and show that they lead to the same results in the external field about a magnet. 6. Define the C. G. S. electrostatic unit of quantity. A sphere the 12 radius of which is 10 cm. is charged with 100 units of electricity. Find the potential, the electric density, the intensity of the electrostatic field on the surface, the stored energy in ergs. 7. Describe Volta's battery. What is the source of the electric energy 12 produced in it? Why is the E. M. F. of this battery very variable? 8. Describe the magnetic field of force about a straight wire conveying a 12 current, and show how it will deflect a magnet needle suspended in the earth's magnetic field. 9. Show how high voltage discharges, in one direction, can be obtained by 12 means of an induction coil and a low voltage battery. TUESDAY, 19TH NOVEMBER. [10 A.M. TO 1 P.M.] GEOLOGY. SECTION I. 1. Identify the five rock specimens placed before you. 2. How are all rocks classified? What is meant by metamorphic rocks? 12 How are these classified and subdivided ? Tabulate under each subdivision the following: : Quartzite, slate, marble, serpentine, gneiss, mica-schist. 3. Write short notes on the nature, properties and utility of the 8 following rocks : Granite, gneiss, trap, laterite, limestone, sandstone and marble. 4. Distinguish between lamination, cleavage and foliation, and draw 10 a sketch of the last structure. What two distinct hypotheses suggest themselves as ragards the mode of origin of foliation ? SECTION II. 5. Draw a sketch map 'of India, and mark in the areas occupied by granite, trap, and recent deposits. Also locate the principal coal fields. 20 6. What is the origin of the Deccan trap? Mention some of its most remarkable characteristics. What is its geological age? Show how it is 7 10 subdivided. Basalt, gneiss, miliolite, diorite, dolerite, flint, gypsum, felspar, kankar, iron pyrites, cales par, dolomite. 7. What are the characters and essential constituents of the following 10 rocks and minerals ?: 8. Give a short account of the geological effects and the causes of 9 earthquakes. 9. Define a fossil, and state the four methods of its occurrence. Name the formations to which the following characteristic fossils belong: Paradoxides, graptolites, clymenia, archæopteryx, calamite, dromatherium, ananchytes, physa, unio, glossopteris, næggerathiopsis, cerithium. TUESDAY, 19TH NOVEMBER. [2 P.M. TO 5 P.M.] SURVEYING. 1. Name the three permanent adjustments of the five-inch transit 12 theodolite, in their order; and state how you would make the first of these three adjustments. Show the advantages of the theodolite over the prismatic compass for surveying purposes. 2. Describe the method of plotting a survey with the circular card 10 protractor; and show the advantage of this method over the method sometimes employed in plotting a compass survey. On what does the accuracy of plotting with a circular card protractor much depend? 3. Define and illustrate Gale's Traverse system; and state for what modes of surveys it is applicable. 4. When a traverse makes a complete circuit, name the three conditions which it ought to fulfil. What is the amount of error allowed on the Revenue Survey in latitudes and departures ? 5. Name the points to be considered in selecting the site for a base line for a Trigonometrical survey of a few square miles with a five-inch theodolite. 14 8. Mention the names of four methods by which railway circular curves may be set out. 12 What should be the length of such a base line? 10 6. Describe in detail the method adopted in measuring the base line on the ground and showing it on plan. 6 7. State how the "station Dot," or point vertically under the signal, 7 for a trigonometrical station is found. What is a Satellite station? 8 What do you understand by the term “2° curve"? B 1964-32 ex 9. Show by a diagram and describe the method of marking out a curve 12 with one theodolite, by angles at the circumference. 10. The summits of two hills, which are to be connected by a third class 15 hill road 20' wide, are 5,000 feet above mean sea-level. The ravine between these hills, which is to be crossed on a level by the road, is fordable at only one point, which is 1,200 feet above mean sea-level; the hills have gentle slopes ; the nature of ground is muram generally and rock in places. Write out instructions for surveying and tracing out this road with the theodolite, noticing particularly the following points : (a) The point from which the survey should be commenced. (6) What special provision in tracing and levelling the line on the ground should be made for crossing small streams, (1) on a level with dips, (2) with road dams, (3) with small masonry drains? (c) What should be the ruling gradient and how should the theodolite be inclined for the gradient ? (d) What steps should be taken in ranging to avoid rocks? (e) At what points should the line be ranged on a level ? (f) State roughly the shortest length of such a line, if there are no streams, &c., to cross, and the ravine is crossed on a level by a road dam. WEDNESDAY, 20TH NOVEMBER. BRIDGES. 1. Describe and illustrate the working of a flying bridge. What precautions should be taken if a long service cable is used? 3. Given 2. Name the points to be considered in selecting the site for a masonry 10 road bridge over a small river. (a) Hydraulic mean depth = 8 feet. (6) Slope of river bed one mile up and one mile down near the pro- (a) Area of natural water way at site 5,000 square feet. Calculate from the above data == (4) Mean velocity of natural water way. (B) Extent of artificial water way. (C) Number of openings, span, and height of piers. (D) State safe velocity for artificial water way, the bed of the river |