頁二第張四第2
日一十月二十年亥辛度裂
WAH KILLYAT PO
報日僑華
三期星日六廿月一年二七九一骞公年一十六國 民華中 育教撟華
(22) (a)
ཙ་ཚིད ཀྱི་ཟླ་
1972英文中學會考試題預習專欄
道書院主編
物理科
(十三)
Physics (13)
(21) (a)
The laws of reflection states thatı (1) The incident ray PO, the reflected
ray OR, and the normal ON at the point of incidence ✪ are coplanaz (11) The incident ray PO and the reflec
ted ray OR make equal angles with the normal ON, that is
Mg.(1)
GOT Ä represents the position of the eye and B the feet of the man
The man sees his feat. through the Incident ray BC and the reflected ray by the laws of
BOB. -- ZACE
is the man and the mirror are both verte Leal, and EC LCD,
Hence
Principle focus
Centre of curvature
As illustrated by the diagram, raya from the top of the object must interest between P and F and its height is less than RQ or BO
Hence when an object or rixed size is placed in front of a convex mirror, all the imagea lie within the principle. foous and the pole of the mirror and are always analler than the object,
(b) With "zesi is positive" convention,
„Object distance (u) = 0.3.
(1) if the page is virtue,
irication ()
x 0.3
(11) if the Image Lë rësi
magnification(a)
43 44
0.2.
0.2
0.6m
་
BBC
CA
The focal length of the mirror il
(i) 0.6m if the image is virtual (11) 0.2m if it is real.
A AEC (8.4.4.
{ A5+ BE)
1972英文中學會考試題預習專欄
BMX VIBRE BA
化學科(十三)
CHEMISTRY (13)
1) In the reaction
107.50 + 2KMnO
+ 8H 0
sulphuric acid acts as an orident the oxidation number of manganese changes from +7 to +10.
(C) the oxidation number of re, 5,
and H remained unchanged
(D) there is an electron-transfer from
(E) none of the above
2) What reagent could be used to disting-
uish between solutions contain
and Zn2+q
sodium carbonāts rolUTION"
B) sodium hydroxide solution
sulphuric acid
sulphurous soid
ammonium hydroxide.
3) Among the following compounds four
substances have a common property not shared by the fifth, neus the odd substance
sodium chloride"
Lodine
ammonium chloride
Bulphur
(B) dry ica
14) When an aqueous solution of sulphur
dioxide is exposed to air for several
Bys, it becomes
(4) sulphur and water.
sulphurous acid sulphuric acid water
a solution of bydrogen sulphiae.
(5) then a salt solution le added to an
acidified solution of Barium chloride, no precipitate is formad, but on boil- ing the salt solution with concent- rated nitric acid and adding barium chloride solution again, a white precipitate is formed. What is the ealt in "question?
(A) sodium carbonate
nodium sulphite sodium sulphate potassium chloride
(B) barium nitrate;
6) i pale green solution yielde a green precipitate, which turns brown on
exposure to air, when treated with
dilute sodium hydroxide solutions The cation is most probably
(P) Cu
・(0) Fa3.
(8) Kn
(23) Show that the lateral displacement Co
of a ray of light passing obliquely
through a' alab of glass, the oppos
(T)
If you are given powdered samples of
(?) I
sodium carbonate, sodium bicarbonate
and sino carbonate, which of the fol-
lowing tests would you perform to identify them?
(P) just by heating the three powdere
with a bunsen burner.
(Q) add magnesium sulphate solution to
sach
(R) add ammonium nyaroxias to caon
(8) add dilute hydrochlorio acid to each (T) carry out the flame test.
(8) An element is a solid at room temper- turs and burng in air to form a white solid, which dissolves in sodium hyd- roxide as well as dilute sulphuric acid. The element could be
sulphur
(Q) magnesíum.
(R) aluminium.
(9) carbon
(T) lead
(9) In a redox reaction, an oxidant
(P) gaina
electrons
(a) loses electrons.
(R) becomes positive (S) becomea negative
*(T) increases its oxidation numb
(10) The reaction between chlorine and
hot conc. KOH is represented here by an unbalanced ionive equation, What number should go in front chloride ion in the complete equation?
ભલભ ળ લ
OB
+301
(11) Which of the following garan doen
not react with alaksã 11052
(A) chlorine
(B) hydrogen chloride-
(C) nitrogen dioxide
(D) ammonia
(B) sulphur dioxide.
(12) In the Gossage Process, the raw
materials: are
(4) brine, ammonia, carbon dioxide. (B) nitrogen and hydrogen
(C
water, sodium carbonate, slaked line (D) limestone, haematite, coke.
carbon dioxide and steam.
(13) Wrought iron is made from blast fur-
nace iron by which process listed below?
(A) heating with haematite.
(B) adding a little carbon only and then
heating.
(0) adding carbon and mangmess and heat- winge
(D) adding carbon and tungsten and
heating.
(B) heating in a stream of carbon mon-
oxide,
Suggested answers for exercises 13
(1) D
(2)
(9)
(12)
66
(5) B
(6)
(7)
(8)
(10)
(11) D
(13)
· 0.8
[ane length of the mirror
(Fig.(2)]
comparing fig.(1) and figi(2),
the man can still see his feet
∙CD = 0.8m:
RF
0.58
на
1.6m
The man sees his eyes through raj However the man cannot see the pay tion of his head that is above his eye. Strictly speaking, the man cannot see the whole of his image no matter whare the mirror is placed.
ite sides of which are, parallel, is given by
where t is the thickness of the alab, ♬ the refractive index of the glass and the angle of inc idence.
ALL COJECT 19.ViewDQ" TATO- ugh a glas plate with payallel faces having a thickness t and refractive index a. Prove that the apparent shift in the position of the object is given by
Explain briefly now this resul may be used to determine the refrag tive index of glass.
(24) (a) State the laws of refraction.
of light.
(b) 4 ray of light entere
priem
whose refracting angle in 60, and is just totally reflected at the second face of the pris Find the angle of incidenos en the first face, if the refract- ive index of the material of the prism Am 168,
中文中學會考試題預習尃欄 英文科 (十三)
Model Answers:
ENGLISH (13)
1972
許藩芳
A. 1. The garden is owned by that
richman.
When the fire broke out, most of the residents perished.
VI,
Although he was rich, he was not always happy.'" They persisted in leaving: at once.
The teacher asked Feter if he would come next day. Having been forsaken by his friends, he felt very miserable.
7 It is six years since our school was established. We are trying to find out how deep the river is. I was going to tell the servant what he should de 10 He stood on the pavement,
watching what was going on
(a) light
(b) fare
b
exhausting
I regret that I do not know his address.
b) up
(a) had peen snowing.
Exercise
had come
would be:
considering
even though he is wealthy
Multiple Choice.
1. He never used to help me,
? :
a
did he.
b
didn't he
used he
(d)
was he
would he
He used to go abroad
(a) did he
(b) didn't he
(c) used he
(a)
was he
would he
Passengers are requested to
the exact fare.
give up
(b) give out
(c) tender (d) submit
(e) hand over
go for a walk, would you
should we
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