頁二第張七第
日五廿月四年子壬层复 WAH KIU YAT PO.
報日橋
英中會考物理科答案(四)
堅道英文書院,
(v) If the reading in the galvanomem.
ter is zero, the bridge must be balanced.
点
Physice (34)
*SECTION
D
ELECTRICITY AND MAGNETISA
3.(b)()
".
我怨
5.(4)
品
3
afode
battery with negligible
· valve
internal resistance
With reference to the above circuit
diagram,
(1) calculate the current I flowing
from the battery,
(ii) calculate the current flowing
through the 2 resistance,
[i竣1) what is the potential difference.
across the 4 resistance?". (iv) calculate the potential difference
between the points X and Y,
(v) if a galvanometer is connected r
between X and Y, to what value
would you change the 50 resistor"
in order to reduce the current flowing through the galvanometer 吃O 必定?
(b).
resistance
d.c. ammeter,
High tension
battery
anode
/cathode
heater
(Diode valve
Low tension
battery
(d) Draw a circuit diagram showing how
you would connect the above comp= onanta so that a current flowe through the ammeter, ・・
ii) What is the function of the heater
in the diode valve?
(iii) How many electrons hit the ancde
per second if the current through the diode is 10 má?
Given: Electronic charge - 1.0 x 10-10
(5,7(4)
21
凡
the resistance, must be
changed to a é resistance
ww
resistance,
Aa.c. ammeter
anode
outhods
high
teneicr battery
phew tension
battery
grcund (optional)
The function of the heater.18 10 provide heat energy to the elect rons in the cathode so that ther mionic emission may take place. In simple words, the heter is for 'boiling off the electrons from the cathode.
iii) If the current is 10 ma,
70 má 10 x 10 A
10 x 10
→3
Goulamb/eck
" number of electrone hitting the anoae.
per second, N
· 6.(2)
F
N-
下
10 x 10-3-
Electronic change
10x.10-3
1.0 x 10-19
-facos
+2 x 1016
#SC.
S
IN
The bean of Arava
Fig. I
Tin beam.of y
Fig.II
52
Reproduce the two vandve, and snOW effect of the field on the B rays in Fig. I and 7 rays in Fig. II.
the
(b)
Idagnet
52
45V
(1)
二期星
日六月六年二七九一座公 年一十六國民華中育教僑華
1972
中文中學會考試題預習專欄
生物科 (卅一) 梁景桓
總複習一答案(甲部)
(c); 2. (e), 3(0); 4,(A), (C), ((0)
1.a.外胚層,中膠層,内胚層
腔
腔腸,觸报;某件
2. 水螅属腔腸動物門
3. 水螅生殖方法有二,配子生殖,蔬菜殖、
ina花柱遺跡; b胚芽鞘;C胚芽;
d胚根je胚根鞘;于皮皮麵
2.貯藏营养,供幼胚萌發生長時所需
Y.將胚乳的溶解养料輸送到幼
3 整顆顆果是由一個子房度育而来, 四、Q前背氣孔 6鈎(大頭),c墊足
d後背氣孔,
2.這是家蠅的幼虫
這幼蟲生活於腐敗苏機件中,如人類 熱便和動物屍体
4. 家蝇生於腐有機物中,正是一般病.
的剛毛胃腸や義に附属漂当 点吾人食物接觸時,便將病潆菌散播 到食物上,經飲食傳染,侵入人侉致 人發生傳染疾病,由家蝇傳播的疾病 有霍乱,伤寒(腸熱)痢疾等
五.1.a花軸.b鳞片葉C当产之球蒸 d不定根去年之舊球巷
2.這是屬於球莖類
3.相同点:小均為地下变態呈(a)的菠育 膨大成球状或塊状,貯藏大量粉 (3)均具有退化鱗片锈
1.
Magact
Z
(1) By Chn's law
I -
14
- 4.4 amp.
42
(11) Current through the 2/resistance
-- Ix
9 +5
-0.9 a..
A mag da
(113) P.D. across the 4 resistance
5
• (x-4 9 +5
2 V
(iv) 5.D. between X and Y
X
The above diagram shows rectanguler coil 430j suspended between the poles of a magnet.
When a Ourrent 18 sent through the coll, it turns about the axis XY in the dazzo- tion of the arrow.
Using the letters ABCU, state tha direction of the current in the coil.
11) kedraw the digram showing the posi-
tion of the coil at which there is no turning effect due to current
in it.
(111) Show by means of arrows
on your
diagram the forces (if any) acting on each of the four sides of the coil when it has come to the poui- tion required in (ii).
(iv) What would be the effect on the
torque acting on the coil if each or the following changes were tried separately?
(a) The current in
increased.
(b) A permanent magnet giving grea-
ter field-atrength is used,
(c) The sides AD und CB of the coil
are shortened.
(c)(1). A milliammeter with a full-scale
deflection of 10 má has
出
ance of 19л. What resistance would be necessary, and how would it be connected, so that the inat- rument could be used as a voltae- ter reading up to 2V.
(ii) A voltmeter having resistance or
100% is connected to the termin. als of a battery of Daniell cells with e.m.f. 5.5 V and internal TeBintance of 10n. Calculate the voltage indicated by thạ voltmeter.
相黑炎的成裘為地上茎基部萑育 而成,而馬鈴薯塊茎為地下匍匐枝 或根基未結育膨大而成,而沽 豊常不定根産生、塊茎美予定根
角膜、白虹彩:c眼球内壁 上之網膜,d. 玻璃爆电水睛眼。
a
2.对彩色不能州别的情况称鸡迫盲
由於網熊上之泥麵华发音不会
想
PAX fas
表横腩膜
deflected towards
no deflection
l
+ve plate
(b) (1) direction of current is BADO,
(1)
· D
N
A
e
24.3吞嚥時間閉順門,防止食物?
誤入氣管:
甲状腺分泌甲狀腺素調節代! 謝速率之平衡,维持正常之長育
性的成熟
大改变胸腔客積為壓力,以達成吸
氣品呼氣
3.肋骨上提;收紧而下降;腹壁
容積擴大,压力降低;肺泡腹之
彈性作用;擴張,降低了
(依次填入题目之空格》
紅血球、
白血球
1. 有輸送氧的功能,吞噬病菌的功能 福园盤狀,中央凹:2.不規則之变形虫 随着细胞核,肉食狀有细胞核不 血紅素,呈黄红色,奉含血红素,专色 3.只能隨血液流動3.能產生變形運
動穿越血管壁! 移動於組織间
龙..種子萌瓷,有初生根自網孔補正。 之網底之幼根顺網底弯曲,貼着網
底生長,甚或由另一網孔屈入.... 3.此实驗証明了根有正向水性,而,
向水性強於正向地性.
↓總複習二、答案(中部) ((D) 2. (A) (3)(C) ; 4.(C) $ (D) (b) (8)
二 10綠質件 6.伸縮胞.C.質膜
d偽足大液胞f. 细胞壁: 2.甲為複球藻(原球藻)
乙為变形蟲 丙為酵母菌 3 Z(a)為綠質條,全有業绿素能行光合作 用將水台二氧化碳合成葡萄糖,行自传 赞养法
Y為食物胞,包圍攝取之食物後,由细 胞質分泌消化酶,於食物胞中消化冰 .解食物,然後透過質膜吸收行們,
体营养法。
工為油滴,將剩餘之养分轉變原版熟
禾完,轉第七張第三頁)
the stable equilibrium condition whilə" Cam 2 18 the unstable equilibrium con- dition.
(iv)(a) When current is increased the.
torque increases.
(b) When the magnetic field strength
is increased, the torque increases, (c) When the sides All & CB are short-
ened the turuue decreases.
A
A
Jun
尺八
B
voltmeter
When
T
2V, deflction in A-
full
This implies that the current flowing 1 10 th,
Hence
2
10+ A
我说
". a resistance of 1907 is to be added;
们
an derius.
1000
约风
-
V
2
x
x 2 -
--~) x 4 -
245
(2 → 1.8) volt.
3.2 volt.
1-8 Volt,
2 volt.
Voltage acrona AB - 5,5 x 100
100 + 10
Forces on the
斗
+
B
B
- C
S
N
Prays.
Forces on the coil
When the place of the cuil is per- pendicular to the magnetic field, there váll be na turning effect.
Heading in the vultaeter
- 5 volt.
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