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日七初月四羊牛芮歷夏
WAH KIU YAT PO
華僑教育
123 期
每日六廿月五年六六九一曆公年五十五國民華中
育教僑事
英中會考附加自然科學試題
til the pressure and temperature of a fixed mass of gas at constant
volume.
[ADDITIONAL GENERAL SCIENCE
** ZUMELO BALDEZEN = 3W0 hours and thirty minutes)
ĮPART I (80 ́márka)
(1. cont)
Candidate-No. ...............
ALL the questions in Part 1 of the paper must be answered fo the spaces provided.
Candidates are actived to compasso rare a in approximately one hour. Chemical symbole and formulae may only be used in equations. In all other cases, chemical names must be written in full.
Graph paper will be supplied on request.
This Question Paper must be handed in with your answer book.
(a)
sitate:
La - Gay Landse's Law,'
(ii), Avogadro's Hypothesis.
'b) Definei
(i)
An atom.
(ii)
An ios.
(iii) A zavarsible reaction.
(a)
What is the Equivalent Weight of a Metal”
(5)
At 7°C, the pressure gauge of a gas cylinder shows a pressure of 4 lbs/sq. in. above that of the atmosphere..
What will be the new reading of the gauge if the temperature rises to 27°0 assuming that the volume of the cylinder does not change?
(Atroospheric Pressure ÷ 15 lbs/sq. in. ).
}
(5. (b) cant)
θα
(a)
Suate in words Ohm's Law:
[d} The enzyme responsible for the clotting of soluble proteins of milk an:
called
PART (120 marks)
.Attempt any FOUR questione. Each question carries 30 marks. illustrate your
anewers wherever possible with large. clear fully labelled diagrams.
(a)
(b)
2.
fa)
Describe, whith the aid of diagrams, how air passes into the funga of any manimal you have studied and how the oxygen is transferred into Ane blood.
How could you show experimentally that a green plant respires?
Make a clear fully labelled sectional diagram to show the structure of a mammaban eya.
(b) State the functions of the various parts of the ave.
(c) Give clear simple diagrams to snow now the defects of long sight cao
be corrected
Briefly describe the process of nutrition to the following organismai",
(a)
an Amoeba,
HORAL SCIENCE)
(b)
a Spirogyra.
let
(b)
From Ohm's Law derive a definition of electrical resistance:
(cl
Draw a diagram showing the electrical circuit you would use to had une resistance of a length of wires
DIAGRAMS:
(b)
35 gma of a specimen of copper partly oxidised was heated in a stream of hydrogen until its weight remained constant at 13,8 gms. What weight of the original specimen was metallic copper?
(a)
(Equivalent Weight of Copper = 32)
Complete the following statementus"
Water gas is manufactured by
AI)
Water gas as a mixture of
(411). Producer gas to manufactured by
Ewj
Producer gas in a coixture composed chially of
and
Three advantages of the gaseous fuela Water Gas and Producer Gas over solid fuels, rar
t.
ier 1 What is the commos nama ter Glyceral Stearate,
Ibi
Give a brief dutižne of the manufacture of soap.
H. cont)
(c)
What is Soft Soap?
9.
Ofw simple labelled diagrams to show the shape and position of the Milanus of L.) Water my Mercury, Bạch in a capillary Lube (immy verutuly so that the tower end of the tube is below the surface of the muquká
411 Wales
(11). Mercury
(C)
(b)
(c)
(PL.
a named internal animal parasite);
⚫ named saprophyte
With the aid of a fully labelled diagram of the skin of a mammal,) describe the structure of this organ.
(b) State the functions of the akin of a charmimal.'
(c)
5.
(a)
(b)
What functions of the mammalian ■kin de you consider are similar to functions carried out by the epidermus of a flowering plant.
State the conditions necessary for seed germination and the further conditions required for healthy growth of seedlings to mature plante,
Describe epigeal germination as shown by named sea
(c) Stare clearly the functions of cotyledons in the different stages of
germination al thus seek
Give reasons for the shape
iscus in each case
FART D (120 marks,
4.
&
8.
10.
Answer FIVE questions only. Not tore than TWO questions must be answered Trom any one section.
Tae chemical equations wherever they serve to amplify your answer
Section 11Chamisery)
(a)
What's
is meant by the term carbohydrate?
Name THREE different types of carbohydrate.and.describe à chemicar
test for the identification of each:
Describe fully how you would obtain a small quantity of reasonably pure alcohol from sugar.
Describe the manufacture al sodium carbonate by the Ammonia - Soda (Solvay) Process.
State and explain what is observed when sodium carbonate ix:-
(b)
(1)
treated with dilute hydrochloric acid.
(ii)
(ii)
State THREE factors which influence the pitch of a note produced by the
tion of a stratched string.
dissolved in water, to which neutral litmus has been added. ) added to a solution of calcium sulphate,
(a)
Describe the laboratory preparation and collection of dry hydrogen #ulphide.
(b) Hydrogen sulphide occurs commonly as an impurity in coal gas. Why is
fi considered necessary to remove this impurity and how is it done?
(c)
If you were given a sample of lead nitrate and a sample of zinc gitat. bow would you use hydrogen sulphide to identify the two substances?
What would be the affect aft
(d)
[[b]
What is the difference between the parts labelled 1 and 37,
(i)
pansing nydrogen sulphide into an acidified solution of potassium permanganate.
(c)
What is the main food reserve present in (4)7
inverting a jar of sulphur dioxide over one of hydrogen sulphid
Section ) (Physics)
4
(a)
Give TWO differences between a real and a virtual image
[-(a)
How would you test for the presence of this food? ̧
B
Name, the food for each of the following insects when it is (8) a larva, (b) an adult,
(a) Larva
Butterfly.
Female mosquito
(b) Adult
(4)
Give equations in words to show the reaction between soap and
Housefly
Ant
(1)
the substance responsible for the temporary hardness of water,
10.
Write the ward or expression that best completes each of the following
statements;
(11)
the substances responsible for the permaneni hardness of water.
State in words the relationship between
......
(a) (5) the volume, and temperature of a fixed mais of gas at constant
pressure,
(a) A matura call in the human body that is normally found without a
nucleus is the
(b) Food is meved along the digestive tube by a process called
(c) ~The ductiesë glands which are located inside the pancreas are called
6.
Draw labelled ray diagrams to show the condigons under which the following may be formed:
| 430_4_An enlarged virtual tunge, J
(11)
(11)
A diminished reat image. An enlarged real image.
(c)
Draw a diagram (no sayà required) to show how you would arrange two lenses to form EITHER an astronomical telescope OR a compound microscope. Show on your diagram the principal focus and the type of each lene and the positions of the object, intermediate image and final
image.
Draw a labelled diagram of a simpla telephone circuit showing clearly the construction of the transmitter (microphone) and the receiver. State clearly how it is made possible for the sound produced at the transmitter to be heard at the receiver..
(b)
Describe an experiment to show how the extension of a spiral spring varies as the weight attached to one end of the spring is gradually increased until the spring becomes permanently, stretched
Draw a simple graph of the weight attached against the extension of the spring and explain the shape of your graph.
A spiral spring is 20 cm. in length. When a solid weighing 60 gms, ia suspended from one and of the spring the length of the spring becomes 24 cms.
The solid is then completely immersed in water and the length of the soring is reduced to 22.5 cm.
Calculate:
[
(11
the density of the solid.
the length of the spring when the solid sa'j immersed in a liquid whose density i 0,8 groja..
(買三第張國第入轉完未)
20