頁二第張六第二日九廿月二年亥癸屣夏
1983
中學會考試題預習專欄
物
理
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PHYSICS (50)
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Suggested solutions to
Revision Test: (cont.)
SECTION
门
KLY
WAH KIU YAT
e.m.f. opposes the motion of the magnete
The greater the
number.nf turus, the
greater is the induced e.n.f.
Therefore, the marnet
takes the longest
time för it to drop through the pipe with greatest number.of.
turns of wirewound on it.
(i) Immediately after the
key k is clased, the direction of induced current is as shown in the figure, below,
ing magnetic flux
報日僑
二期星
When balanced, p.d.
across PX e.m.f. the cell Eg
of
PX
0.5=
PX
25 cm
the balance.point is 25. em from P.
(Ans.)
in the laminated core and therefore: induce an alternat- ing e.n.f. in the secondary coil. But a steady direct current supply: will not give any change of magnetic flux and There will be no induced em.f.in the secondary coil.
EV
(d) When Ky is closed and
日二十月四年三八九一腿公年二十七國民華中 育教僑華
shows a half-flower and a longitudinal
section of the ripe.
lop-sided fruit
developed from the flower.
produced are not
genetically
identical, and this
means that the
offspring produced
as a result of sexual reproduction are varied. This
variation allows the species to adapt to changing conditions
to a
for to move
environment.
new
PLOWER
petal
auther.
is open,
filament stigma.
P.d. across PX
styla
2ㄨ
Resistance of PX. Resistance
of
sepal receptacle
ovole
RpX
overy wall peduncle
10+15
II. FRUIT
(where
Hpx
resistance of TX)
(b) E
F..
(c) 20
Figure
Figure
Metal
sphere Dt
idra
(with
Beta ray.
Gamma ray
Alpha ray
20 days=2x(10 days)
-2x(half-life time
The number of: bismath atom left
=1010x (1) 2 =0.25x1010
2.5x109
(a) Tz > T2
magnet
(Ans.
When the
passes through the plastic, pipexam
induced emf. is set
up in the Wire
winding on the pipe.
According to lenza
law, this. induced
Sometime after key
K was closed, there is no induced curre current for there is no change in flux. i) Immediately after
the key Kis opened, the direction. of.. induced current is as shown in the figure below.
Foran ideal transm former, the
efficiency is 100%.。
fencer
Input-Output (2)(100)
= f output
current)(200)
output current-1A
As there are energy. losses in a Corimon transformer
(input > Output) such as heat lost in the coils, eddy current in the care and non-ideal core design. Therefore the output current must always
be less than 1A.
ii) An alternating current in the
primary: coll will
set up, an
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專中 樂
R, 5.0.4!
and
are both
py
(a) Since when the keys.
open; the balance point X is 62.5 cm from P, therefore. across
·PX=e.m.f
Let I he the current through Roy
of the cell
0.5
resis
0:5 5+7
PX
#10 x 2.5
100
p.d. across R
=(0.04)(5)
-6.25 Fid, across PX
=0.5V
(Ans.).
e.m.f. of the cell is 0.5V
Let the internal resistance of the
cell Eg be rn.
Since when the keys Ky and Ky are both
the balance
closed,
point X is 10 cm from
across PX
10 100
=0.2V
current through
0.20
=0.04 A
Hence, apply Ohm'B Law to the loop: containing the cell E and resistance.
0.5=0,04(5+r}
r=7453
When Fa
is closed,
(Ans, Open and
p.d. across PX
PXX
PX
.00
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-0.2V
when halaiced,
) (RpX
生
)=0.2
·Rpx =2.5°
·10x
PX =25cm
PX 100
the balance paint is 25 cm form P.
(Ans.)
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BIOLOGY (30)
W.W Leung.
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Revision exercise
Name the organs in which meiosis occura
(1) în man and (2) in Bauhinia, (b) What is the
importance of meiosis to these organïsus?
8. The following diagram
·解决音樂指揮練習場地
康樂文化署與成教中心
|心多作聯絡+協助該中 「署將與成人教育康樂中六個,及二萬三千多「職員工的薪金後,餘下 苪劍琴表示,康樂文化 康樂中心來年度增至十 | 支付二百多名全職及兼
·康樂文化界副署長一豆至號不足。成人教育三一樣,只有約二百萬, ,但預料八三至六四 用作資助廿多項活動的
將作緊密合作解決難題 黃劍琴副署長在成教研討會稱
商科電腦夜校 +
| 加入香樂統處工作,
菅統處可爲成教康樂中
火巧 脫新靼女士: 不少來自大陸的音樂家
·黃劍琴稱,由於有
及 年事務主任文会 |社會福利署融蔴地社區 ,市政局公共圖書館主
服務」、並列業者尚有
·策力推廣文化及康樂 *表示 論 主題爲「 合第二天項目特作上述 畢辦第十八屆成教研討 黄氏日昨在脊客
·场地缺乏等問題。
T一心解央指揮不足,練習
參與
奥關於交換資料及義工 下參加者熱烈發語主 所屬部門的工作後,台
心提供顧問服務。
·三位講著各自介紹
「樂中心的工作人口及成
反映中心不但缺乏
|的大部份是成人教育
圓,從他們所提的問題
數百名參加研討會
班:
級
1344箱守秘。
均城
可
詳
列桉
條舍
件 課
及室
at 16
【政府津貼)
順德聯誼總會
胡少渠紀念小學
校址:屯門安定邨;
劃 個 租出
報租
八截止日期四月廿三日) 緖履歷連同近照寄新界屯門安定邨本校收合則約見 誠聘83 年九月份到職之各科教師多位應徵者請 主席兼校監:何輝
旺角勞工子弟學校招生
本出
心報名手續;出示出生紙或身份證 考生二吋半身近照一張
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五個學位。
八一年十月一日起,教育署接受對某些特殊
(a) Describe a common vay
to prevent self- fertilization in flowera which have similar relative
of the
anthers and the -atigma.
(b) List tro
disadvantages of self-pollination.
(c) Name the parts of the flower that give rise to the structures A, B and D.
(d)-(1) What.ie atructure
C2
(2) Describe briefly
how it is formed. (e) (1) Suggest a cause
for the aborted C.
(2) Comment on the
relationship between the
growth of C and fruit growth.
(1) State (three
advantages of seed reproduction.
ANSWERS :
(a) (1) Meiosis occurs in
raries of
£tie
the female and the testes of the male.
(2) Heiosis occurs in
the ovules" ́and
the anthers of
the flowers.
(b) Meinsists a type u
普通宮立學校內,爲輕微弱能者提供三千二百二
cell division. The
·daughter cells
[教育學校有七十一間
本港有六十九間资助特殊學校爲高度弱能兒零五百三十五次服務。
童提供七千一百一十八個學位,學生包括失明、
妹教育學生有一萬一千六百六十人,資助之特殊 學校及普通學校之特殊或啓本班級就讀人數由二 特殊教育組同的為特殊 敎 師開辦在職訓琜
為此得史良了,能兒童在特殊學校接受教的理念,結果有十四間特殊
李所師於對
學特洲八一 生殊鍊 一
提教課 年零聽師
據學
年
(a) The common way.is for
the anthers, and
atigma in: the same flower not to ripen
at the same time. (b) 1. Novariatious
would arise since the offsprings have aimilar genetical compositions as
their parents, The species may become weakened after a long period.
(c) as styles, stamens
and sepols. B: receptacle D: peduncle (a) (1) The seed.
Pollen grains germinate on the sugary stig
igma and a pollen tube. grows down the style, towards the ovary and into the ovule. Male nucleus passes down the tube and fuses: with the egg cell to form a zygote. The fertilized:
ovule becomes a seed.
(e) (1) The ovule had not
been fertilized. (2) Seed and fruit growth are
related. If the
seed fails to develop that part of the fruit adjacent to it also fails. (f) Three advantages.of
seed reproduction: 1. Direct
本學年開學時在各特殊學校就讀人數
transmission of disease to young: plants is avoided, Variations are possible and this leads to improvement of apecies under natural aelection.
3. Dispersal of
學位數字續有增加
據敎署統計逾一萬人學校共七十一間
fruits and seeds ie possible: over a long distance,
特殊教育進展良好
僑
教
•負社,
協會擾商至之,五八,迟到靠程校校萬
國會大得特 期八集七百一特純,及,特接
際合案小殊 ̇铼六體七 三 至殊和 拍戴包殊受
何辦支學教及年年十八 立舰括教了带
殘,持,香堆收忒康五百智共社失實住學學
人皇,中組 加客服復茨 年組書 教合明組宿 交
年香比,與 他萬,劃 務 會辦在 學等弱時
後赛與殊院移八加皮 期馬華學偡 等西家辦 ,會橋恢殘。人殊之 香齊曰,人“之教主 自者密
港助報運。
EGE TORONT
該三教 亦為、特
了服。月名體辦。
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