1978-01-10 — Page 26

真二第張七第日二月二十年巳丁夏 WAH KIU YAT PO

育教僑華

in temperate regiona," such as those at Germany; and near Gladstone and Awinana' in

Australia, so alumina plante

are found there,

Revision Questions:

The folowing paragraph from a newspaper describes a natural disaster which occurred

1978

| 中學會考試題預習專欄

28,

地理

(十五)

李婉儀

GEOGRAPHY (15)

Suggested answers to questions“ 26 & 27 26.

The feature is known as. honeycomb weathering or Tafoni.

Itais an example of chemical weathering.

The

deeply pitted surface resembles that of a honey-comb is main- ly due to the removal of the mluble material by salt spray from the sea. This type of weathering is quite common in sene parts along the shore- Line of Hong Kong, especially on granitic reck of which the feldspar, a type of less resistant minerals, becomes soluble and is easily was ted way, forming numerous small

SLE on the surface.

Besides sea spray, the pitted surface may also be due to the removal of soluble material by humid air and rainfall with dissolved carbon dioxide in the atmosphere. In some cases, larger pools known as tafəni are formed.

27.

a clay with

Bauxita

a high content of aluminium oride Australia is one of the important bauzi te prod- ucers in the world, host of the bauxite is wined in the

Country

tropical parts, eats

where 232 S runs acroRN south, e.gi alone the coast.

the Cape York Peninsula Weipa and Gore. Bauxite wining is active in such tropical areas since baurita deposita

are mostly found in tropical regions or in arens which experienced tropical climates in geological past.

It is because bauzite is the end product of tropical weathering. Nearly all clay centaina aluminium compounds but only in areas where high temperatures and abundant rainfall (cendition common in tropical climates) have led to a concentration of the aluminium oxides in the sub- noï k. Under the humid hot and rainy climatic regiona where red laterite soil is formed as K a result of the accumulation of insoluble sxides of irem and have con- tained a fair amount alumin- ium of exide known an bauxite,

Oftenly bauxite is not refined locally. Bauxi të mined in the tropical regious ef Australia is winly for

Une of the determina- export. ting factor in market availa- bility. When the ore în mined It is usuɛlly transported to the regions where aluminium is mostly needed ♬ liuge marke ta are usually the developed in- dustrial regions, where a lot of finished sensumer goods: maile of alumina is consumed. Silice such industrial advanced csuntries are mostly found in temperate regious, luminiu is mostly refined along the coast of temperate countries such as in Australia, bauxite is either exported to the refinorisa at Gladstone, hurri Kurri and Bell Bay; or to the temperate countries such as Japan, Germany France and U.S.A., where a lot of fabri- cation planta are located and the dense population offere

kandy market.

Furthermore, it in: alsa due to the fact that enormous, quantities of electric power are required is the production of aluminium, regions with cheap ll.kik. ure, favoured in the choice of refineries... locations. Since most of the well tapped il... stations gre found in tesperate regjona - such as in U.S.A., Japan, and Hell Bay in australia, it is no wonder why alumina plants are found there. But is. regions with a rich coal sup- ply, thermal power can be

| substituted for H.8.F. boo t

of the well-developed coal- field in the world are found

in long hang on June 18, 1972:

"At about

pin a huge mass of earth, recks and s vegetation broke loose from

the west side of I.D. 2260. and tumbled down 'at a terri- fic speed' across Conduit Road. It broke the retaining wall behind 11, Katewall Head, and partially buried that h house up to the level of the second floor. Eye-witness' spoke of a thunderous noise -as (it) happened;"

Name the form of matural disaster described above, Give an account of all the facters responsible for their occurr- едсе and suggest some possible. ways to prevent them.

29,

*** Hoth Hong Kong and Japan are important manufacturing countries in Asia. Compare

and contrast the masons for the rise of mufacturing 'i ndustries in these two

countries.

數學

十五 女長波

Mathematica 15

Exercise 7

Multiple choice questions.

1. If arithmatic means are

to he inserted between 6 and 20, one of them will be

A4 10 89.2

E11

c. ?-3

Which of the following is equivalent to

C..

B. x2+5x+640

If 3, *.*. z, hë fare în Continued propertion, the value of x is A. 3 B. 6

D. 16

16

If x;y=y÷z, then

is equal to

B.

x-2

divided

the remainder is

D:10

the Firs thr digits

which of the following is

NY

the best approximation to

A. 9.88 B. 98.8 D. 9880 E. 998007

A gold bar with dimensions. 2cmx3cmx4cm has all its

faces rectangular, If it ia melted and re-cast into three cubes of equal volumes, what is the length of an edge of each cube ip cm?

A..5 B. 4 C. 3 D. 2 E.

A can do a piece of work in 3days, B In 4days and

in 5days. How much A

receives from 8940 if all work together?

A. $235, B. $240 G. #300, 1. $3584 E. 8400

9. The area of a circle

inscribed in an equilateral triangle of height bom ia A. 4faq.cm B. 9way.co. ∙C. 16Taq.em D. 25faq.cn

E. none of these.

日十月一年八七九一股公年七十六國民载中育教儒業。

報日僑

二期星

10.If B. exceeds a by 20% and

C exceeds B by 20%, then

©. ¿P+ZQ+ZR+LS=360°.

D. 0 bisects ZPOR

E. PQRS QR+PS.

the ratio of A to Cie

B. 5:7 C. 1:1 E. 25:16

.A. 1.

In the figure represents

the graph

A. y=sing +CHAX. B. y=kx{k is a constant) _C__y=kx+] {k is a constant) 22 12 12:0 D. y=sin E none of these.

In the Figure- AR÷AC=BG=C}=1; Then_AD=

(14)3 = 2.74!

the volume is increased

by 174

tạng

sino

Answer:

और

317

+c0% X

."

and sine cos50; then would be

B-30° D: 60

1. B 2. A 6. B 7. D

9. A 10, A 11. D 12, € 13. B 14. E 15, A 15. C. 17 E 18. E 19. A 20.8)

3. B E

4.A

5. E

-277

sinë c.nae

717 717

新數學

717=-0.7276 (Ans

十五 金榮家

sine e 8

717

MODERN MATHEMATICS (15)

Answers to Test

7- - 0.7276 (Ans,

Section A

(n)

Sn

3

1. Ingx"

the first term

Logx

log

log10

log 10.

-10

10x

In the figuro, ¿ANC=98;

and CD-15, then the length of XB ja

A. 15cos50°

C. 15taa50° D.

15taz40°

E.

158 in50

15sin40

sin20

sin20.

AQ B. 1 C. 2008

D. Rain co998. -2sin@rose

In the figure, ABCD is rectangle. Wheft of the following expressions is the distance of A from the line CK?

A

paint q¢o®Ð

B. psing +qsing

Crip +asino.

D. psin+q

E. peoseqšinė

19

In the figure, what is the sum of the parked angles? A. 90 B. 135 C. 1801 D. 2209

E seu! 17.

18.

(rejected)

10 (Ans.)

(x-y) (x-2)

**v}{£=3}6z= =y}+ *xz=x)

(x-x) (x-x) (x-3) (x2-"y"

(ins.)

3ă-l 810

|(10)

810

the c ́ommon différe

T(2) TO) -[5(2)-3)-2.

• 29[2(2)+(20-1) (5)

S(20)

SECTION B.

Let

J.S.

990 (Ang.)

1(1) (1+1)2

it is true for, nal

Assume the statement is true

·when 'n

(k+1)3.

Let the original fraction

When 'n - K+.

{k2(k+1)2 + (k+1)3 (k+1) "[{2+(k+1)]

From (1)

4x

Аля

(1)

From (2)

2x - 3

Sub. inte (3).

Ax 3(2x-3)

25)

XYZ & triangle right- angled at X. XKIYZ. If YK-4 and KZ-12, then" XY- A. 15 B. 12/3

the fraction.

(Ane.)

12

.D.

In the figure, XZ, TY are tangenta, XYT=

A. 100° B. 110" C. 120 D. 125 E, 130°

In the figure, a circle,. centra touches the siden

́of a quadrilateral. Which

of the following is not. truc?

A. POHS in a cyclic, quadrilateral

B. ZPOQ+ZHOS=180*

As shown in the figure above, the V-shaped polygon is made of a equilateral triangle. VEF and 2 congruent parallelograms each with sides 10cm and 2em and that the angle between the sides is 60° (or 120°), Area of the triangle VEY

J.

4(4)(4)sin60° 4/3 cm2

Area of one

of the

(2)(10)sin66o

•10/3.cm2

Total area

4/3 + 10√3 + 10/3

cm2

243 cm

--41.57 cm2 (Ans.)

(k+1)2 (k+2)

+(k+1)2 {{k+1)+1]2·

Therefore, it is also true

for n

= k+1,"

Since the statement is true for

awl, and if n=k ía true

the statement is also true for n k+l; therefore, the

statement is true for all

natural numbera n.

The family of st. lines

k(x + 2y) ►

(1+k) x

(2k-3)y +

+ 5 = 0. Slope of the family.

(1+ k) ·

2k- 3.

Slope of x + y * 3 is -1, if the family is parallel to x + y = 3, then

1 + k 2k

> in 1

k = 4 (Ang.)

(ii) slope of x - 2y = 3 in

if the family is parperdic ular, to x 2y3, then

1+k 2k 3

* -2

k» (Ang.)

(iii) The centre of the cir

ele is (0,5) (1+k)(0) +(2k-3)5 +5 - 0 k = 1 (Ans.) (iv) { x = 3y + 5 = 9

x + 2y (

سر

-12 y = 1

Pis (-2,1). (Ans.)