ENGLAND. PRELIMINARY GENERAL EXAMINATION.—Christmas, 1863. THURSDAY, December 17th.-Morning, 12 to 14. CHEMISTRY. Examiner-W. ODLING, Esq., F.R.S. 1. What is the composition of atmospheric air, and how may it be ascertained ? 2. What is meant by the specific heat of a body? Is there any relation between the specific heats of the different elements ? 3. Describe the processes by which hydrochloric acid gas and ordinary aqueous hydrochloric acid are made. What are the chief properties of the gas and of its solution ? 4. What are the respective formulæ of the following salts: alum, gypsum, green vitriol, nitre, oxalate of ammonia, and bicarbonate of potash ? How is alum made ? 5. What are the chemical tests by which the presence of copper in a solid or a liquid may be determined ? 6 What are the principal processes for obtaining hydrogen gas 1. Distinguish between Statics and Dynamics. Define the terms force, component forces, resultant force. 2. Enunciate and prove the parallelogram of forces. (a) Two forces of 50 lbs. each act at an angle of 120° upon the same point. Find the magnitude and direction of their resultant. (B) The forces 12 lbs. and 15 lbs. act on a point at right angles to one another. Find the magnitude of their resultant to four places of decimale: 3. Two parallel forces, of 20 lbs. and 30 lbs. respectively, act at the extremities of a straight lever of the first kind, the length of which is 7 feet. Find the position of the fulcrum, in order that there may be equilibrium. 4. Define the centre of gravity. Show that the centre of gravity of a triangle coincides with that of three equal particles placed at its vertices. 5. State the laws of friction, and show how to find the coefficient of friction experimentally. 6. A body (W) is kept in equilibrium on a smooth inclined plane by a power (P) acting parallel to the plane. Find the relation between P and W. 7. State the laws of motion. 8. Define uniform acceleration. Prove that a body acted on, from rest, by a uniform acceleration f, will describe the space ft feet in the time t seconds, a foot and a second being taken as the units of space and of time respectively. 9. Find the space through which a body near the earth's surface will fall freely from rest in 6 seconds, being given g = 32 feet. Explain clearly the signification of g. |