17 DEC 1974
育教儒韻頁三第張六第 日四初月一十年寅甲歷夏
WAH KIU YAT PO
報日僑業
CITY HALI.
二期星
3(a)
:堅道書院主編:...
CD75
中學會考專欄
生物科(五)·廖國置 ·
本精海園內容:
1.痛疾癖的生活史2. 侵入與傳染3痿疾病徵狀治療
别 類植物術分類,6.细菌的形態生
The making of protoplasm, hope are chiefly nitrates, phosphatea, 肉伸出定 carbonates, chlorides and
sulphates of calcium, potassium, JERRÆmagnesium, iron and so tum.
Rabatku Honother accessary food factor in our diet is vitamins'. They must be present in anute quantity
since they are essential for the proporušilization of food and for maintaining healthy growth.
冰蠍的營養植物性營養法
***+2 In addition to the above water is
+*££***
上條光合体 用之土具有陽光照射時、茶綠 素便會把嚤進材料光合成葡萄
rs
·白質將接雜有機物有於细胞肉。
紅邂轡題的瘗原蟲是一穢,A.真 菌類 B.黏菌類
物
中學會考專欄
這書主編:
A384424.5、6
在方法是A.有性生生物科(五)·卓清基儀
BIOLOGY B
#5)
EXAMENS 200 Anawers to Review questions on
Bongo
Nutrition.
a: c bite
FOR. I ARB, 2BBC, 3CAP izplanations to Experiments 6 and ADZE, SARE..
PARAÍZES, VERRIÓZA
液進入血液中,
山根瘤菌其生活方式為A等
RASA
BROMARCA **** 和口
another essential in, a diet since
it is the chief constituent of protoplasm.
The organism also.
requires water to maintain turgidity of tissues, for internal transport of food, oxygen, and waste (ie. blood and urine contains
water), mainly
Roughage, consisting of indigesti- ble materials such as in vegetable and fruits, are needed to bring about peristalsis which is the movement that aids the passage of materials along the alimentary tract. Lack of this will lead to sluggish persistalsis and resultin in constipation.
Q.8. An 18-year-old student
weighing 150 lbs require a
certain amount of calories for a
single day. This is given in the table as shown below. In addition
he requires approximately 14 -
calories per pound for his basal metabolism. Show how you can.. calculate the amount of calomes h require's per day. Activity
walking
f: Aig: B
1)
K: C1: 2. ta J
1: G n: C
H
studying.
attending
lessons
Exp.6.
playground
dressing and
The aim of this experiment is to show that ensync diastase ligesto
From the etuly of enzymes starch.
we have learnt that they work best
playing in the
football eating
at an optimum temperature (approxí, undressing mately 38°C). That is why all the running
apparatus were kept warm.
taken from each tear tube and
After 30 minutes, sanded were.
tested with iodine solution
Semple from A since at the start.
of the experiment, icding solution Was alrewly added, Its "colour bad.
|‹s›ƒ£Art. 3lready turned dark-blue so when.....
(细菌细胞與一般田泡大
23.
3粒綠茶紅色
越
血液瘦脂中心野磁
球中
立姨-
:
胞有两種
吉成一個球
我有然後再分裂
每個分生孢子车
+
***
06
式細菌結構圖
III問答題:
more-iodine solution was added, it remained dark-blue
This test tube was set up de a
means of showing that there would
be a colour change when starch solution is tested with lódáne solution.
Sample from Br" no colour change. This mears that the starch in the salution muss heve undergone some chaiges, and, is no longer in the form of stowh. To determine what has happened to it, another sample was take: frou 2 and boiled with
Fehling's sclution to zze di Figar
has been formed (we know that
enzyme die stane acts on staranj
converting it to a suger). The
resit was a positive indication.
This proves that starch is digests
by enzyme distece, proizing a sugari -
Sample from Of The result is tho seme as those obtained in 8. This shows that there is an enzyme in seliva which has a "Bizi lar effect as that of diastasa on: starch. What is this enzyme? Salivary amyles, or ytualin,) A Control experiment could be set
Whet up, using boiled saliva.
would it prove? It ad prove that by boiling, the enzyme 12 destroyed and is unable to
function. This is a means of prov ing one of the properties of
Exp.7.
Sample from (3) No colour change indicating that starch is unable to iffure through the visking tubing. Imple fron, (ii) : No, colour.
unge.
When a sample from (ii) was beste with Fehling's solution, a red precipitate of copper oxide was produced, showing that the sugar
produced by the action of the
un ViAAAAREA. liastase or the starch can diffuse
上期答案:
1.ima (1912)D (3) E(4);
(5) A (6) D; (7) B; (8in, cg9ip, tišiĄ.
2
St. 3. homo fà 67.4**
5用合成粉中。
& 9. to the
11. 2014mm) 12. Bikant) 13
....
162 musashi, 17, 1 cup) 19. RÌža
胞、19.外胶.20.中膠會
(13)珊瑚、海葵、水好
水蜷横切
外腰子
肉膝價
・
中蒜蓉
through the visking tubing.
Since visking tubing has the same pemeability to substure us that of the lining of the intestine, it shows that we can only benefit from the stares we eat if they are iigestoi first, otherwise no
iffusion from the small intestines ould take place..
Diet: In order to maintain health of max food ist den in and jutilized. It may be oxidized in order to liberate energy that is required for work; it may be used for growth are repair of body cell or, it may be stored up for future
uso.
Thus, the food we take in forms our diet. A perfect or balance dies should contain carbo- hydrates, fats, protains, water, mineral salts, vitamins and rougnage.
Q. 7. Many "modern"! people nowadays are facing dietary problems.
Briefly explain what the consti-
tents of a 'perfect' diet are and
why they are recessery.
A. Since healthy growth requires a
Job dim: AGAT LS sufficient amount of energy, one o
K**JA. –ANAH the chief constituents of our liet
JAK
防禦敵人之侵害。
aust be energy reducing food,
K4nely fate the carbohydrates
[faily intake of food 1. net
aufficient to provide the energy
Two HD); <✯ required, he will lose weight as
☆豚・丼物胞受横須
化為嫩嫩细胞補完之,亦可 形成精巢印巢及芽體等。
腺細胞多能
☆
writing
Houro:
momentun
Mass of ball. 0.2ke Initial vel.of ball
Sue +20 m/s ̈*•
Final vėls of: ball J. V = 0 (it drops
Change of moniec tun
0.2(0-20)
4 NÓ
By the Conservation of Momentum
+ MU= my+ MV K H(VU). = — m{v — u).
where M the mass of the
trolley,
U is the initial velocity and
Vis the final velocity
of the trolley. Change of momentum of the trolley (VU)\
{ } = + 4 lis
negative signi momentum loss positive signi momentum gain
Change of momentum: of the ball (v).
*** 10.2(-26-20)
-e NS
Change of momentum of the trolley
(= N(V) = 0) = + 2 N@ 1)A'A = 00, t repre- sent the initial Epsed, a, or the ob jet.
ii) Area OAA (AAC)
=(00) (OA) [= 1 (u) (ma) = mu That, is, it repre- sents the kinetic energy possessed by the object when 19 is at & speed of iii) Area A'ABB' = AOBH - OA À +(9⭑B) (03 )➡AA(OA) (y)(mv)(u) (mu)
Calorics used per pound. 0.2
20
spied
中學會考專欄
慳道書院玉緋
物理科(五)·陸永慨
PHYSIOS (5)
jolutions for the last issue ..
E (a)
E
ngh any mer
Position ·Â ̈
C
mgh
6. DE
E
0
total
energy
Since, 2gh
2
v =2gh mv2ngh
mgh
The total energy possessed by the hob in positions A, B, and Care equal in magnitude. From: A to E, potential energy as com verted to kinetic energy; from B to C,kinetic energy is conver ed to potential energy again. Thus, energy is conserative, it. changes from one form to another only.
· [b]_
Pendulum
10.2 10.4 0.5 0.8 1.0 lengin (m) Perroc 1.5 0.9 1.27 1551.3: 2 -22 (97) 1081/1.6112.43 244
2(a)
T 2
2
416 by
From the gra
the slope of
17 135:
tan =
tan e 40-25=9-85_ms
те
1)The pendulum
length is indi- cated on the diagram by "L".
11) The path traced
by:-
A to B to
B to A"
indicates
complete
vibration.
to
0:
-
kinetic energy gain- ed when the object. is at a speed of v
Problems for this week
A ball rolling with a speed of 9 m/s on a horizontal surface meets a hard incline plane as shown.
.uzym/s
Hase of ball = 0.2 k Length of incline, AB - 6. m Length of incline, CD = √2 m Length or BOA
m
A Describe the motion of the bail
if friction and the opposition to motion can be entirely ne- glected.
b. Find the velocity of the ball,: if friction negligible, on the level platform DE AA
ci If the ball is rolling down in
the direction of ED with a sped of 9 m/s, can the ball reach position A again?
If yes, what velocity does it possess
To what is the miximum
it reaches?
A 10-kg metallic block slides down an incline of 200 with the horizontal, with a uniform spee! The angle of inclina. of 2 m/s, tion is then increased to 37°- (a) What is the minimum horizon
ta force required to keep' the block at uniform speed down the plane?
(b) What is the minimum horizon
Torce required to push the block up the plane at a uniform speed?
3. In an experiment using a pulley hoist, V.R.-4. the following results were obtained: Load
[kgf)
Effort {{kgi)
21 4 6
10 112. [14
1.01.5.2.0 2.5 3.0 3.5 4.
Calculate the corresponding eff iciency and plot separate graphs of load against effort, and effi- ciency against, load. From your graphs find:-
(a) the load with can be raised by an effort of 2.8 kgf. (b) the effort required to raised
a load of 7 kgf.
(c) the effort required to raised
the lower pulley block when load is attached,
(d) the efficiency for a load of
13 kgf.
(e) the efficiency for a load of
3 kgf..
(f) Explain why there is a change
in efficiency when the load varies.... &
iii) The period of a simple penuu-75- lur is affected by the magnitude of the gravity 'g' of a place. The gravity, is the pull of the earth exerted on the bob. The
sertion of a strong magnet be-
low B provides the same effect of pulling the magmatic bob (iron) downwards. Thus, the gravitation is re-inforced. The period of
the simple pendulum ia slowed dowzi
The board and the pendulum Lob fall freely together. They are in the state of weightless The bo remains at
Ife)
his body tissues are utilized for
oxidation in the colant of energy,]
Proteins, the constituent that is
The
known as body-huilding material, i
another vital part of a diet,
are required to build up new proto-{ plasm which is necessary to replace Kom out tissues and to maintain (*) 7 **Bhoo.growth.
No diet can be either entirely
La pošteník Pans Spark ka protein or carbohydrate or fat.
来
李端彩的擺動可使消化液 與食物混合买车的肠内烧心,因 我食物便漸漸消化分解。
It must be balancec, cont:ining
carbon and nitrogen in the approxi- mate mtio of CN 15:1
Another constituent is mineral salty
A number of inorganic,,salt. are needed by living organiens in 2 order that' there may be conetant supply of the elements required fo:
sme
12 gcose
position A and has
中斷會考專欄
化學科(五)·陳湛杰
CHEMISTRY (#5)'
SOLUTIONS FOR CHEMISTRY (#2)
Conventional Questions..
•
electronic interaction that result 1. There are two general types of
in the formation of chemical
Covalent bonding in- compounds.
no relative displa-volves the sharing of electrons by cement with the
atoma. Tonic bonding involves the hoard....
108s and gain of electrons to for ions (errions and cations) that are joined together to fom
The component gsine has no effect on restoring the bob to position B,' that 1B, in converting. potential energy to:
cinetic enery. The effective com- ponent is g cos37°, 0.8g.
Let Tate the period of the pendulum at sormal position.
T= 2
When the trolley slides down the incline, the period becomes
2-268378
70.8
I
1.251.1152。.
times. When an atom needs to
gain or lose mo
more than two electrons in order to attain a stable electronic arrangement like
1t that of an inert.
rarely is gas, capable of doing so. Instead, it fome compounds with other element: by sharing elec
electrons to form covalent bonds. And so it is with the carbon atom. It prefers to share each of its valence electrom foming covalent bonds, mather tha to give up or take on electrons. Carbon atoms have the unique abilty to combine with one another to fon -carbon-carbon. "chains", which may be straight, branched, or cyclic. In other words, the valence bonds of each carbon atom can be satisfied by combining with other carbon atoms, Sugar, with a molecular formula of CH2011
10 such a carbon compound 'Ethe
日七十月二十年四七九一赓公年三十六國民中
covalent type. In the solid state the compound existe in the form
of molecular crystals, being bound together by weak van der Waal fores. When it is heated at fairly low temperatures, these
The
attractive forces are overcome, and the compound melts such that the molecules of sugar are free to move about in the Tiquid state. However, whether the sugar molecu les are in polia or liquid state," no conduction of electricity is Possible as the electrons are bound (localized) and are not freely mobile for the flow of electric current. In a compound. made up of two elements that have very different electron-attracting tendencies, the tond will be largely fonic, e.g. sodium chloride. aodium aton has a relatively low. electron attracting tendency whereas the chlorine atom has a relatively high electron-attracting tendency (chlorine) readily Toms a negative ion, and the atom with the low electron-attracting tend
tendency (sodium) readily
a positive. ion The resulting compound, then, consist essentially of positive ions and negative ions joined. together, and the bonding must be largely ionio, In the solid state, these ions are
arranged in regular - arrays in a crystalline lattice with strong coulombic forces hold- ing the ions of opposite charges. Thus the ions are not together. mobile and cannot serve to conduct electr
tria qurrent. Molten sodium chloride cont
contains positive sodium Long and negative chloride ions 01-(as in crystalline state) which are now able to move about with
Under the considerable.freedom. influence of the electric current the positive ions tend to migra to the negative electrode negative ions tend to migrate
Various the positive electrode. chemical changes may be possible the electrodes depending on the nature of the electrodes and the comitions of electrolysis. Thus if inert (unreactive) graphite
used, the positive. electrodes Na ions are converted to. Na metal at the negative electrode; while at the positive electrode the 01 ions give up electrons to the electrode to for chlorine atoms, Cl which in turi combine to form stable diatomic molecules of
01. Thus molten sodium chloride serrea not as a passive electric conductor but is itself subjected to chemical change by the electric current while at the same time participatse in the conduction as charged ions, 2. Some of the common acids are
HL, HNO, H2SO and H. PO
In aqueous solutions these acids dissociate (ionize) extensively,
to produce H+ ions that is, hydrated H 10ns.
'at
Acids such as H01 which ionize almost completely in dilute aquains solution, are regarded as strong - acids.
15. An acid that lonizes to
acia
only a slight extent in water is called a weak acid. Acetic Acid CH COOH 15 an
of a weak example Thus, a water solution of a strong acid has a relatively high concentration of Hions, and a water solution of a
a weak acid has e relatively low concentration of H+ ions.
(1) Where conductivity in solution is concerned since bath. acids (HA and HB) contains iona in solution, both serve as electrolytes However, the actual
quantities of · ion in HA is much more than that of an equimolar solution of HB so that HA will have a much higher conductivity (i.e. lower resistance
Another difference between
(2) acids and weak acids is
strong
room temperature Na2+0
(B) heating of silver oxide Ag¿0
(0) strong heating of lead
monoxide FbQ
(D) strong heating of mangancae
dioxide Mno
(E) fictional distillation of
Liquid air.
2. Oxygen will not combine with the
following directly:
(A) sulphur heated in open així (B) calcium at moderate heating i:
the absence of moisture (C) carbon heated in a flame at
high temperature
(D) hydrogen and oxygen at room temperature in the presence finely divided platinum (E) strong heating of mercury.
oxide in open air
3. Which is the stable allotropic
form of sulphur at 100°C? (A) molten sulphur
(B) rhombic sulphur (c) monoclinic sulphur (D) flower of sulphur
(B) plastic sulphur
4. In the presence of hydrogen
sulphide gas, acidified potassium dichromate peper will turn from:
(A) white to shiny black (
orange to pals creen
pale green to orange; (D) no observable colour change (E) orange to pale yellow
3. When sulphur dioxide is passed into a solution of caustic soda
for a prolonged period,
(A) sulphuric acid is formed
sodium sulphite is formed
B
(C) sodium sulphate is formed (D) sodium bisulphite is formed (B) sodium bisulphate is formed
Conventional Queations
1. Describe a method for classify- ing the oxides of the elements. Illustrate your answer by exmaplės. showing the characteristics of each class.
2. What are
the
evolved gasea
when Jonc sulphuric acid is warmed with (a) sodium chloride, (b) sodium nitrate, (c) sodium formate, (d) sodium oxalate?
Describe and explain what happens when cono, sulphuric acid is added: bo (a) sugar (b) sulphur (c) zine oxide. What property of conc.
sulphuric acid is illustrated in each case?
C975
中甯會考專欄
堅道書院主編
經濟及公共事務科
(五)
敏 ECONOMIC AND PUBLIC AFFAIRS (#5) questions (4) How, in your ';
opanion, een our labour laws be: improved?
Answer: Every adult male worker should get the statutory right to a six-day working week, but at the same time leaving him the right also to work on the seventh day if he so desires. In autual fact, for one year or so the Government bas been considering very carefully b how my labour lavs may be refo med so that there may be come for of squid security for the colony* workinz class.
Women working in shops and PRIVices are at present of A. seven- day working week. affected.
They should be given one day off with pay. It has also been found that in certain industries, such as hotels o restaurar.ta, there is no rändam
Our
introduce
their effect on the freezing point of solutiona. The freezing point
is of an aqueous solution by the presence of solutes. Water has a freezing point of 0°C, but once B Bolute is added the freezing point would be lowered, The extent of the lowering freezing point is dependent on the concentration of molecules or ions in solution,
HA is a Thus if strong acid dissociating almost completely, HA will exist mainly
H+ 28 and A-long if HP is a a very week acid it will exist essentially Ba HB moleculae with almost no H and
This would Bions.
result in the lowering of the freezing point (from 0°C) to twice the extent for solution of HA compared with an equimolar solution of HB 1.e. the HA Bolution will have a lower. freezing point than the HB solution (3) In spite of these differences in certain reactions, solutions of
acids strong
H weak acids produce
Thus the the same overall effect. same volume of H, would be evolved. from equimolar aqueous solutions of HA and HB in reaction with sing metal. The reason is that the same amount of "replaceable hydrogen" (free hydrogen ions plus combined but ionizable - hydrogen) is present in both solutions. A
B
(4) The rate of reaction with zinc metal would be expected to be. greater with HA then with HB since the reaction involves the direct participation of the
Zn + 2H In2+ + H2 hydrogen ions with zinc metal.
(5) The solutions of salts of strong acid-strong base, and that of weak acid-strong base behavé differently in water. As sodium hydroxide is a strong base: Nal is the salt of strong acid-strong base and NaB, the salt of weak
In aqueous acid-strong base.. solution both salts are completely. ionized:-
Na+ Na+ + B*
NЯA
Na B
}
age for 31.. this
ployment
te
Labour
It should be male commsom
30:sory for all factories, unless exemption is granted, to form joint consultative committees to deal with manageiront problems.
It must also be made compulbo ry for 211 factòries, to inform the Labour Department of $11 indiaatrid: disputes whether big or small. And At the same ting, it is compulsory, fall management officials and wirxe za to attend.comiliation when disputes beccre ceiidus. 411 talks given by the Labour Departmut essential servicos must by law submit themcelvse to compulsory arbitation when conciliation fedla Fon-easentiel industries, on the other hard, will have voluntary arbitration when talks at the conciliation level fail.
At the present moment, no one: really knows what rights and obligations exist for both employers and workers, Thus, it is vitally important that, unless, there is an ordinance defining employers and workers' rights and obligations, there can never be an improvement in our system of social Becurity. Calculations of wagŠS today, vary from factory to factory It is also necessary to set forth a standardized method of arriving at workere, wages, and what amounts of compensation workers are entitled to receive when they lose their jobs through no fault of their own.
Holidays and rest days should also be given consideration when
So our labour laws are reformed. are sickness allowances, which should be improved, based on the worker's length of service.
Since HA in solution La completely ionized A and H+ will not recombine in aqueous solution, which would remain heutral.
Today, if a worker is hospitalze However, as HB is a weak acid and
he can only expect to receive half is the stable species in aqueous
of his normal wages; this is in-.. sufficient to maintain his living; solution, certain quantities of i
he sho will recombine with B′′ to fom
should be given more, say two-
Those who are undissociated HB molecules.
thirds of This
wages. us of his results in removal of some' H* in permanently incapacitated should solution, rendering
also receive greater benefits from their employers. H+B
Laws should also be passed to increase safety standards at building where dangerous industies or quarmes exist, Illegal strikes and lock-outs, picketing and intimidation must also be given greater emphasia, so that picketero know what they can and cannot do within the law,
HIB
the solution basic. QUESTIONS FOR THIS WEEK
The questions in this issue are related to 2,1, (b)(ii) Oxygen; 2.1.(b) (11) Sulphur. Study your notes and textbook on thesc sections before attempting the questions.
Multiple Choice Questions
11. Oxygen may not be prepared from
the following reactions
(A) sodium peroxide and water at’
Question for next week
(5) Give a description of the work
and functions of the Home Affairs Department.