日二初月四年牛芮船室
WAH KIU YAT PO
報
華僑教育
Calculate (1) che oreight of the rod. (ii) the reading of the spring balance (Working need not be shown)
(£).
(i)
英中會考自然科學試題
Complete the following staterrente:
(a). An eclipse of the moon occurs when the umbral shadow of the
(8 cast on the
The
the boiling point of a fiquaRİ
melting point of a sold
PART I (80 marks)
GENERAL SCIENCE)
Time allowed - Two hours and thirty :
nd thirty minutes
Candidate' No.
ALL answers in Part I must be written in the spaces provided,
Candidates are advised to complete this section in approximately one hour. Chemica symbols and formulae may only be used in equations, ALL names must be writte in full,
This Question Paper must be handed in with your answer book.
悲
(a)
Name one suitable reagent to remove from a sample of air each of the ] following:
(1) Oxygen (ii) Carbon dioxide
(lil) Water Vapour
(b) Perspiration cools the body or
necessary for the is taken from the body.
(6) am increase in pressure
And
in
(11)
(21)
- If these gases are removed from air, what remaing ?
Name:-
(1) A solid bicarbonate
(ii) A bicarbonate known only in solution
(iii) Ar acidic oxice
ERNAL IGIENCE
Plenge tuziqver.}
(a) Ae a cyclist free-wheels down a hill his increases while his
his brakes in order to slow down, dome of his is converted into
energy
energy decreases
When the applies
energy
10
while
(*) The current delivered by an accumulator 18 that from the secondary coil of transformer is
(1) A generator with slip rings delivers
(g) The temperature to which air m51 called the
curren'.
cooled to become saturated lo
(h) A compass needle which is brèe to move, comes to rest with 118 magnetic
The angle between this direction and true
axis in the
North 16 known as the
This
(1) Some of the energy of a simple cell is sometimes fast because currents flow between particles of zinc and impurities on the surface of the zine is called
and is partly prevented by plate
the s
(1) The diagram shows the dial of an electric meter recording the consumption of electricity in Kilowatt-hours What is the reading of the melez?
JI
(iv) An efflorescent substanca /
(v) A dotiquescent substance
(vi) A solvent for rubber
(vii) à soivent for iodine
(R) State the law of Constant Chemical Composition (Definite Própórtions),
Complete the following equations in wordas'
(i) Sodium + Watar »
(il) Sodium Carbonate + Sulphuric Acid =
Identify the substances which bays the following
A BILOR POWDER WAICA CABEDIVES in dikte sulphuria - old to form a hina)
A solid which when left in air bursts into flames and produces clouds of white smoke,
A red powder which en heating gradually disappears producing a gas that supports combustion leaving a shiny deposit on the sides of the test tube,
yellow liquid which taxas hiue litmus red and whan hunted witis gaYDER. túrnings pródiszne brown humas, i
KILOWATY
HOURS
1000
to kwh.
期
日一廿月五年六六九一麼公年五十五國民中
E.
G.
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(b)
State five functions of E,
(
(1)
Wirky
(iv)
iv
State three characteristics of a good soil.
(1)
(ii)
Give four external features of a fish which together distinguish it from birds, and mammala
[1]
i)
(iv)
(a)
Rate three characteristics of insect pollinated flowers.
(1)
(il)
(10
(6)
Name a local fruit which is dispersed by (i) wind, (i) explosive mechanisni
(1)
Two sides YZ6ZW are sliväreir
Sketch the path of ray AB through the block and-out into the air. diagram clearly to show the principles Involved.
Mark your
{"slivered suTFACO
silvered surfac
A body walghing 150 gms, floats in water with one quarter of its volume above the surface- What fert
- [a] The upthrust of the water on the body,
PART II (120 marks)
Candidates should answer FIVE questions in Part II; not more than TWO questions. being taken from any one séction.
Section 1 (Chemistry)
stāve chemical equations wherever they would serve to amplify your answers.
Describe, with the aid of a labelled diagram, how you would prepaze pure dry chlorino, starting from sodium chloride.
State Iwu ways in which nydrochloric acid resembles the other common Taboratory mineral acids and TWO ways in which it differs from them.
(c) Give FOUR common 'uses of calorine..
State befefly FOUR general methods for the preparation of salts and illustrate mach by an equation in words. Select any TWO of these methods and give complete detalls for the preparation of a named purs dry sample of the salt by each of these two methods,
(a) Describe the preparation and collection of nitric acid in the laboratory,
Qirque me commercial preparation of nitric seid from Ammonia,
(Physics)
Section
(a):
数
(0)
Dafine the terms (i) a Force, (ii) Work,”
Déscribe a simple experiment to find the average horeé-power exerted
by a man climbing an inclined ladder.
A man uses & long rope and a system of pulleys to raise a load of 880 tba, vertically through 8 ft. He exerts a steady effort of 110 lbs. wt. while pulling 80 ft. of the hauling rops through his hands in two minutes,
|SBICU are showing workingt.
(*) Two gases lighter than air
(b) 】 Two gases which are vary soluble in water
(14)
Two crystalline forms of carbon and give two uses of each
fat crystamme form.
Jagi
(b) The total volume of the body.
(4) The density of the body,
2nd crystallina form
Unca
(1).
(11)
the Velocity Ratio of the pulley system. the efficiency of the system,
(iii)
the horse-power at which the man works.
(d) The volume of the body above the surface when it floats in a liquid of
density that of water,
(d) How would you find by sxperiment the posinon of the centre of gravity",
of an irregular shaped sheet of cardboard?
./
How would you check that the position obtained was correct?
From the following list of chemicals
brine, calcium chloride, calcium hydroxida, sodium bisulphate, manganese dioxide, sodium sulphate, mercury, -asarch, peirol.
select one example àli“
$14) A Galyst.
(1): An acid kali,
̧(iv)
An electrolyte.
[v]
A hydrocarbon.
Name the parts indicated by guide tines in thaïdiagram of the dissected rabbit showing internal organs..
(a)
Draw a labelled diagram to show the construction of a charged simple Lead accumulator.
Give TWO tests by which you could tell that such an accumulator is fully 7 charged.
Describe in detail with the aid of a labelled circuit diagram how you would charge a 12 volt accumulator using current supplied by either the Hong Kong Electric Ca.. or the China Light and Power Co
Give FIVE important points in the maintenance of an accumulator.] Explain, clearly, stating the scientific principles involved:
(vi) An element.
A uniform rod with centre. C la suspended by a athing from a spring balance so thai 18 is horizonia)
gma 160 kms.
(a)
A pieco
of
paper can be set on size by using a suitable tens as a burning.
glass.
(b)
The wire filament of a gas-filled electric bulb is (i) than (ii) tightly called.
(c)
A knowledge of the velocity of sound in water can be used to find the depth of water below the hull of a whip.
་་
(d).
A car engine will • seize-up' if it runs short of oth!
Section III (Biology)
7. Draw a fully labelled diagram of a section through the skin of a mammal you'
have studied,
What functions are carried out by the skin of a mammal ?.
8. (a) Describe the structure of a named seed? (diagrams are essential}
(b)
What experimente wai id you perform to uino out the conditions necessary for its garmination?
How would you show that light, chlorophyll and carbon dioxide are necessary for photosynthesis 7
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百二初月四年午丙感
AWAH KIU YAT PO