青教僑華頁一第張七第日四十月九年巳丁磨片 WAH KIU YAT PO
郭日僑華
育教僑華
In the figure, DC is a
diameter of the circle.
By using the cosine
formular, prove that
22 2
2 Zabe
2 in experiment was
set up
as shown below.
red ink solution
d=a+b+c
a
13.
學能推理練習專欄
智慧社主椒
bottle
test- tube
數學(四) 女長波
Mathematics
Exercise 2
Attempt All questions in Section A and any Six
questions in Section B.
Section A (Each question
carries 5 marks)..
1. If A+B+C=180" Simplify
COSACOSC+cos(A+B)cos(C+B). COSAsinC-sin(A+B)cos(C+B)
B:
In the figure, AB=AC=10cm
and the perpendicular from A to BC is 53 cm. Find 4BAC in degrees and in radians..
In the figure, DC is the diameter of a circle and AB is a chord parallel to
If ABAD, calculate ZBAD. (Geometry theorems need not be quoted when used.
In the figure, BY bisects ZABC and XY/BC, AB-8cm, BC-10cm. Calculate the
length of AX (Geometry theorem need not be quoted when used.)
Simplify
3× – , (x++4).
2
The 4th term of an arithmatical progression is 10 and the 8th term is 16. Find the 9th term. Sum of rain falls on the flat roof 264cm by 330cm. The water runs into, a cylindrical tank 84cm diameter. Find the
increase in depth of water in cm.
(Take T=24)
A mau in a train travelling at 30km/hr. notices that a train going in the opposite direction passes him in Vsec.
If the length of the train is 220m, find its speed.
Section B
9. If 3x-4y+7z=0 and 2x-y-2z-
Find xyz. llence, if
3 3
3x y +z 18 find the
values of x, y and z.
10.If 2, 3 and k are the roots
of the equation
3 2
2x+mx-13x+n=0, find. a,
n and k
11. In a triangle, the sines of the angles are in the ratio 4:5:6, and the side opposite the smallest angle is 20cm. Find
12.
(a) the lengths of the rner
other two sites.
(b) the area of the
triangle and
(c) the greatest angle in
the triangle.
·1-4.
In the figure AB//CD;
BCLCD. If AE-EF-BD prove that
(a) BE-BD
(b) <ADC BDC.
In the figure, PX bisects' ZQPR and PV bisects ZRPS. M is the mid-point of XY. (a) Show that P lies on
the circle diameter XY, (b) Hence or otherwise.
prove that
2 2
RY RX 4PM RM. 15.A 36f. cask contains 302.
of spirit and 6). of water. 12. a are drawn out and the cask is then filled up with spirit, 12 more litres are withdrawn and the cask is then filled up with water. What is the final. percentage of water in the cask?
16.890 is paid for a task.
which A can do in 3days of Shomreach, Bin days of 9hours each and C in 6days of 10hours each,
(a) Find the ratio of their
hourly pay.
(b) If Hand
C
were
together, what is the total amount they will earn în 10 hours?
(c) If A works alone, how long will it take him. to each $40?
生物
(四)
梁永華
BIOLOGY (4)
Unit Two: Respiration
TI Conventional Questions:
The following diagram
diagram represents a piece of apparatus at the end of an experiment.
flask
KOH soln
mérnina- ting seeds
Atm pressure:160%|
mercury
15 cm
e. What is, the hypothesis that this experimental set-up is endeavouring to verify?
b. low would you prepare a
control for this experi- ment:
c. The mercury rose
15.cm
at the end of this experi- ment. How would you explain its
d. What complication would. occur in this experiment
if the germination seeds. had begun to show green
Leaves?
Ans:
a. This experimental set-up.
is to verify the gaseous exchange during the 'res- piration of germinating sceds.
b. A control can be prepared by using a similar set-up with no seeds in the flask. c. The mercury, róse 15 cm at
the end of this experiment indicated that one-fifth of the air (i.e. oxygen) was consumed. (15/76 + 1/5 7
d. If the germinating seeds
had begin to show green leaves then the green leaves would take in carbon dioxide and gave off oxygen
during photosynthesia. This
would cause the experiment
to become complicated.
insect
Explain the purpose of this experimental set-up. b. What is the use of the
bottles?
c. What would you expect observe if the insect (i) is a dead one. (ii) is living but does
not move.
(iii) moves all the time. Explain it.
Ans:
a. The purpose of this experi-
mental set-up is to detect the ras-pressure changes i test-tube A and B. Tor instance, if the gas pres- sure in test-tube A incre- ∙ases (e.6. due to higher temperature) the red ink, solution will move towards test tube B
To prevent the disturbance produced by environmental temperature fluctuations on the system.
(i) Since the dead insect
no
effect on the
pressure in test-
A, the red ink solution remains in its position.
(ii) The insect resrires. The heat energy pro- duced leads to gas expansion in test-tube A. Thus the red ink sol:tion moves towards test-tube ...
(iii) The movement of the
insect increases, the. rate of respiration.
Frater not of ener- released canines the gas to expand more. Thus the red ink sola-
tion moves towards test
tube B much faster.
3.a. List the e
the differences between aerobic and
anaerobic respiration. b. Where does respiration
take place in the cell? Explain why respiration. is found in all living things?
Ans
Aerobic respiration: 1) oxygen is essential 2) nore energy is produced 3) carbon dioxide and
water are end products Anaerobic respiration: 1) oxygen is not necessary 2) less energy is produced 3) carbon dioxide and
alcohol(in plants) or lactic acid (in animals) are end products
b. Internal respiration takes place in the mitochondria,
c. All living things require
energy for their living
activities. They have to
obtain energy through
respiration.
地理李婉儀 黎仲豪
GEOGRAPHY (4)
Answer to Question 5:
The seasonal distribution of rainfall in Hong Kong ::
From the climatic graph, we can see that the rainfall in Hong Kong, with an annual total of about 2,000 - 2,500 m.h., does not distribute evenly. About 80% of he rain occurs in the summer months from May to September. A monthly total of over 250 m.m. in the summer rainy season is not uncommon. While in it is ralatively dry,
Bater,
The summer maximum of rainfall in Hong Kong can Partly be explained by the influence of monsoRDS..
Hong Kong lies in the Asian mon- soonal wind belt, in summer,
a low pressure belt is formed over Mongolia, while a high
日六廿月十年七七九一屦公年六十六國民華中
三期星 pressure belt is found over the sea. As a result, the winda blow inland from the
sea. They are therefore molet. and they bring heavy rain to
In winter, the Hong Kong. winds blow offshore because the low pressure over kongolia is by now replaced by a high pressure system. Thus the winds that influence Hong Kong are quite dry (Fig. A).
Furthermore, the high summer temperatures in Hong Kong (with an average around. 27 C) are likely to induce rainfall too. When the land, surfaces are overheated, strong vertical air currents set up. As the air ascends, ite temperature is reduced until condensation takes place and clounds are forged, The water droplets in the clouds will become bigger with further ascent, which means further cooling. In time the water droplets in clouds become too big and heavy to be saturated, rain begins to fall. This type of rain ie known as convectional rain- fall, Hong Kong, being ait- uated in the tropical lati- tudes, the convectional rain- fall is especially character- istic in summer. "(PIG, C)
Cumulonimbus clouds
of
around Deep Bay, the southwest
Lantao Island and the Tsing Yi Island. Such a geographic d distribution indicates an oro-
This is because, graphic effect. as mentioned above, most of the rain in long Kong is brought by onshore monaoons which blow mainly in an esterly direction from the sea. As the moisture- laden winds meet themountains, they will be forced to rise. They are then cooled, condensation thus occurs and clouds are formed. Being subjected to much the same process as those in the rising air currents as heated, water droplets fall down at last,
Thus the mountain regions, espec- ially the east-facing slopes in Hong Kong, have more rain because of this orographic effect. By the time the winds reach the lowlying western part, they are depleted of moisture. As they descout the leeward slopes, they are warmed by compression. Consequently, there is little rain and these areas are referred to
areas. (FIG. D) FORMATION OF ORO - GRAPHIC (KELIEF) RAIN
aB rain FIG. D
lives of condensation.
As air ascends.
28 jecomes coder
Ang Saturated
R+H, #ves
As air descends
it tømpressed Wstcomes
Vis survië P. -- Rim. fwis
MOUNTAIN
MASS
SHADOW
SEA
questions for next week:
Using the following: figures. describe the variations of wether elements on the day recordeu
16.18
"23 23
1925 25 24 23 23 24 19 33 34 33
Rejstive
! Humidity 95 95 97 48 15 ·63 44 66 95 AS
Local
"Arsing
time.
100
joz!!
· WAITO":
Chro
Ving amber
Temp
denger Jair.
LAND SURFACE HEATED BY THE SUN.
FIG. A THE SUMMER MONSOUN
OF ASIA
NTENSE
AESSURE
HONG KONG
HIGH
HORSE
LAY
Besides the monsoons, the seasonal distribution of rainfall in Hong Kong is also greatly affected by taphoons. The typhoons, which attack Hong Kong mostly from may sto September, are always accom- panied by turrenciai ((rige B)
FIG.
MAIN : TYPHOON. TRACKS IN THE WEST PACIFIC OCEAN
PHONG KHÁNG
Mut of the tropi [ess cyclones a fe
formed to the
of the
Philippines
The geographical distribution OF rainfall in Hong Kongt
FIG. II is the annual rainfall map of Hong Kong. The map shows that the areas with maximum rain-, fall (over 2,200 m.m.) cdncide with highland areas, e.g. Tai ko Shan region and Lantao Shan region. The areas with the lowest amount of rainfall (below 1,800 m.m.) lies on the west, .......... The northwest lowland
Rain fast (mmi
-7.
FIG. 1 and 11 shows the layouts o two arming areas in long foug Study them carefully and answer the. following:
A.
Suggest the crops that may be grown in aach farming area, giving your reasons. b. Describe and explain. tue
forms of settlement in
each
FIG. I
·DUCK POND
YONG TSENG
FIG. IIIK
B
TAI FO-TAU
LOP
300 M
AWW vi lages and houses
AKO
Narrow koad Tath
Main Road Woodland - Contour (H.)
River
Hailway
經
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