826 
Junior Examination Papers, 1891. 
EXAMINATION IN ELEMENTARY CHEMISTRY. 
MAXIMtTM NUMBEB OF MAEKS, 200. PASS NUMBER, 75. 
Tuesday, Novemlcr 10, 1891. 
(Three hotirs allowed.) 
1. Describe two processes for the preparation of oxygen gas. Name the 
principal properties of the gas. 
2. From what salt is nitric acid (HNO3) commonly prepared? From 100 
grammes of the salt, how much of the acid can be obtained 1 
3. What is meant by an element being mon-atomic, di-atomic, tri-atomic, 
&c. ? Give an example of each. 
4. A solution contains chloride of barium, chloride of calcium, chloride of 
magnesium : how would you prove the presence of the respective elements ? 
.O. Distinguish between the ash (mineral matter) left — 
(«.) when wood is burnt. 
(J) when bones are burnt. 
6. A crystalline powder, purporting to be " blue vitriol," is believed to 
have some "green vitriol" mixed with it. Define the terms '■ blue vitriol" 
and "green vitriol," and indicate how you might detect the presence of the 
latter in the mixture. 
7. How does sulphur occur in nature ? Describe the allotropic modifica- 
tions of sulphur, and say how they are severally obtained. 
EXAMINATION IN MENSURATION AND LAND SURVEYING. 
Maximum Number of Marks, 100. Pass Number, 40. 
Wednesday, NoremVcr 11, 1891. 
(Tivo hours allojved.') 
1. What is meant when a plan is said to be drawn to a scale, the repre- 
sentative fraction of which is loTOo' 
If the plan of an estate were drawn to this scale, how many yards apart 
on the ground are two points, which are shown on the plan by two points 5 25 
inches apart ? 
2. In a triangle ABC the sides A B and A C are respectively 5,275 and 4,160 
feet long, and the angle B A C is 71° 10'; draw the triangle to a scale of 1 inch 
equal to 1,000 feet ; note the length of B C, and the number of degrees in the 
angles B and C. Find also from the drawing the number of acres, &c. in 
the triangle. 
3. The circumference of a circle is 1,000 inches; find (a) the length of its 
radius, (h) its area, working with sufficient accuracy to ensure finding its 
area to the nearest square inch. (7r = 314159.) 
4. How many gallons of water are there in a pipe (kept full) a mile long 
and 3 inches in internal diameter? If water is delivered from the pipe at the 
rate of 5,000 gallons an hour, with what velocity does the water move in the 
pipe ? (A gallon contains 277 274 cubic inches.) 
5. A and B are two points 5,500 yards apart ; B is 37° to the north of east 
from A: using a scale of 1 inch equal to 1,000 yards, find by construction how 
many yards B is north, and how many yards it is east, of A. 
G. A, B, C are three points in order on the ground ; they are respectively 
20 feet, 15 feet, and 18 feet above the datum line ; from A to B horizontally 
is 200 feet, and from B to C is 300 feet ; show the points and the slope of the 
ground between them in a diagram, using 1 inch equal to 10 feet for a vertical 
scale, and 1 inch equal to 100 feet for a horizontal scale. 
The level is placed between B and C, and the back-reading of the levelling 
staff at A is 2 feet 7 inches; find the back-reading of the staff at B, and the 
fore-rcadino; of the staff at C. Draw a line on your diagram to show the line 
along which I he observer looks in taking the levels. 
