(Incorporated by Royal Charter.)

PROFESSIONAL PRELIMINARY EXAMINATION.--MARCH, 1886.

THURSDAY, March 11th-Morning, 9.30 to 11.

CHEMISTRY.

Examiner W. B. KEMSHEAD, Ph.D.

[N.B.-Only eight questions to be attempted.]

1. Describe the preparation and properties of Iodine. What are its principal uses?

2. Give the percentage composition of a Salt having the following formula:-KNO. What is it? (K = 39, N = 14, 0 = 16). 3. Salts are described as Monobasic, Dibasic, and Tribasic. What do you understand by this? Give examples.

4. Explain fully what you understand by Combustion. Illustrate by reference to experiments.

5. What do you understand by Atomic Weights? Cu combines with Cl in the proportion of 31.5 to 35·5, and also in that of 63 to 35 5. Hg combines with Cl in the proportion of 200 to 35.5, and also in that of 200 to 71, and with O in the proportion of 100 to 16 and 200 to 16. What are the true Atomic Weights of Hg, Cl, O, and Cu? Give reasons for your answer. 6. What are the constituents of Atmospheric Air? How would you demonstrate the presence of each ?

7. How would you analyse, quantitatively and qualitatively, a sample of Air ?

8. I have a mixture of Sand, Butter, and Sugar. By what means could I separate them ?

9. A Salt has the following percentage composition. Determine its formula and name:

Carbon, 6-35; Sulphur, 52:38; Potassium, 41.27.

10. Complete and, where necessary, correct the following equations:

(a) 3MnO, Mn,0,+02

=

(b) Zn+H2SO1 = ZnSO1+

(c) MnO,+2Na C1+2H, SO1 =

(2) NHNO = H,O+N,O

The left side is to be considered correct.

place in each case.

Describe what takes

11. Why is Gunpowder usually considered to be a mechanical mixture of Charcoal, Saltpetre, and Sulphur, and not a chemical combination of those substances?

12. A drinking water is suspected to contain an organic impurity. What chemical means would you take to test if it were so; and, if so, how would you roughly determine its amount?

1. Sound travels with different velocities in solids, liquids, and gases. By what experiments or observations can you establish the difference in the velocity (a) between a liquid and a gas; (b) between a liquid and a solid; (c) between a solid and a gas ?

2. What is meant by the statement that the intensity of sound is inversely as the square of the distance from the source.

is this law demonstrated?

How

3. What is a monochord? Show by its means that the pitch of a musical note is affected by the length of the wire, by its diameter, material, and the strain to which it is subjected.

4. How is an echo produced? What are the conditions for the production of a multiple echo?

5. What are nodes and loops? How investigated in an ordinary organ pipe?

may

their presence

be

1. What do you mean by the term refractive index of a liquid ? Describe some one experiment which illustrates the difference between two substances in this respect.

2. What is meant by a real, and what by a virtual, image? Give diagrams showing the formation in each case.

3. Explain the principle of any one method by which the velocity of light may be determined.

4. What are meant by conjugate foci? In what position must a double convex lens be placed between a candle and the screen so that the image and its object shall be of the same size; and how is the distance between the screen and the object related to the focal length of the lens?

5. Describe an experiment illustrating the phenomenon of total reflection, and show what are the conditions under which it

occurs.

1. What is the meaning of the term coefficient of expansion of a liquid? What is the difference between the absolute and real expansion of a liquid, and how may this be demonstrated and measured?

2. What is latent heat? Give its numerical value in the case of water, and show how the result has been arrived at.

3. Explain what is meant by radiation of heat. How can it be experimentally shown that bodies differ in respect of this property? Mention some of the best and some of the worst radia

tors.

4. Define the term "boiling point," and explain how this depends on the atmospheric pressure. Show also that a determination of the boiling point of water leads to a method of measuring heights of places.

5. Explain the way in which the draught of a chimney is produced; and also the manner in which a fire ventilates a room.

COLLEGE OF PRECEPTORS.

(Incorporated by Royal Charter.)

PROFESSIONAL PRELIMINARY EXAMINATION.--MARCH, 1886.

THURSDAY, March 11th-Evening, 5.30 to 7.30.

EXPERIMENTAL

PHYSICS.

Examiner-Prof. E. ATKINSON, Ph.D., F.C.S.

ELECTRICITY AND MAGNETISM.

1. What are the essentials of a lightning conductor? describe some laboratory experiment which illustrates its action.

2. Show how a piece of steel may be magnetised by means of a permanent magnet. How would you determine the strength of a magnetic bar, a magnetic needle, or a horse-shoe magnet?

3. Describe and explain the process of electro-plating.

4. Describe any one form of constant voltaic element, and also some form of instrument by which the current which this element produces may be accurately measured.

5. Round one limb of a horse-shoe magnet a long length of fine insulated wire is coiled, the ends of which are connected with a delicate galvanometer at a distance. What takes place when the keeper is placed across the two ends? and what when it is again removed? State and explain what important application is made of the principles involved in this experiment?