THE AUSTRALASIAN JOURNAL OF PHARMACY. 
29 
3. Give the sketch of a simple piece of apparatus to show “ that the volume 
of a gas varies inversely with the pressure.” 
4. Two cardboard tubes, 4 inches in diameter and 4 feet long, are placed 
at an angle of 90 deg. with each other. At the ends nearest each other is 
fixed a tin plate at an angle of 45 deg. At the end of one tube is placed a 
watch, and I apply my ear to the other. The ticking of the watch is dis- 
tinctly heard. Explain this. 
5. I have a tuning fork, which, when sounded, is said to vibrate 250 
times per second. How can I verify this and ascertain the particular musical 
note produced ? 
6. A piece of red cloth is said to be red owing to the absortion of certain 
waves. What waves are absorbed ? Give your reasons for the appearances 
presented by a piece of black velvet and a sheet of white paper. 
7. The window of a small room is closed so that no light is allowed to 
enter except through an aperture one inch in diameter; against this aperture is 
placed first a double convex lens and then a Hint glass prism. Describe what 
will happen in both cases. 
8. Describe the compound microscope. 
9. A flat cake of beeswax about three-quarters of an inch thick is placed on 
a stand six inches high. Upon it are placed four solid metal balls of copper, 
iron, lead, and silver, which had been equally heated together at a temperature 
of 165 deg. C. Describe the order in which these balls penetrate and fall through 
the wax. 
10. What do you understand by the term “boiling point,” and how does 
pressure affect the boiling point of a liquid. 
11. Explain the production of cold by evaporation. 
12. Two copper kettles — one brightly polished, the other covered with soot — 
are both filled with water at 98 deg. C., and allowed to stand for half an hour 
at the ordinary temperature of the air. What happens to each, and why? 
13. Pieces of ice are wrapped (1) in folds of flannel, (2) in calico, (3) in 
a linen cloth. Which material preserves the ice the longest ? 
14. Explain the phenomenon of dew. 
Advanced Physics. 
Instructions. — Put the number of the question before your answer. You 
are only permitted to attempt eight questions. The value is the same for each 
question. 
Three hours are allowed. 
1. A piece of metal weighed in air 7*3919 grammes ; when immersed in water 
it only weighed 7*0089 grammes. What metal do these figures indicate, and what 
is the operation involved? 
2. What is the unit of mass usually adopted in science, and explain how it 
is derived? 
3. Show that while the mass remains constant the velocity generated in a 
unit of time varies as the force employed. Describe suitable apparatus to prove 
this. 
4. Two plane mirrors are hinged together at various angles and a luminous 
body placed between them. How may the number of images be determined? 
5. Give two of the methods by which the velocity of light was ascertained. 
6. A ray of light strikes a concave mirror in three ways — 
(a) From its geometrical centre. 
(5) From the principal focus. 
( c ) From a point infinitely distant. 
How do these rays obey the laws of reflection ? 
