期
台三月四年八六九一屉公年七十五民警务
寶二弟張六第
自六初月三年申戉歷室
WAH KIU YAT PO
#
B
0968
英文中學會考試題預習專欄
If the meter is used so wOR SEEN
must be biased away through »
物理科
maximum current of 5 smp., (9 - 0.05) amperes
The value of which 10
shunt restetan (a)
(廿三)
睦永熾,
A
Physics (23)
moving coil ammster consists of a perDSKOGÍ magnet with circular pole faces to set up s radial magnetic field. A rectangular coil fres to move in the annular space formed by fixing
soft-iron cylinder is put amidst the field.
The coil, which is would on a light sluminium former, is pivoted on jewelled and bearings and carries a pointer, The frame for the bearine is made used as current connection.
Is, coʻl bearing
2 control-spring
į). pointer
pointer cunter-balance
S. coil an aluminium forums
6. soft tron
2. control spring
Action of the simeter
S
The field of the permanent egnet is eadia L. äs current passes in the coil another magnotio field is get up in the coil. This disturbs thesis original one. The resultant field is a show is diagram.
(5 - 0,05)
- 0.25
958
0.25
Q.25
A
495
• 0.0909
Ans. The smunt of 0.0909 ohm. is used.
44. Potentiometer
A potentiometer is used directly for the
measurement of voltages, and indirectly for
the de termination of current, and the
calibration of ammeter and voltmetera,
A simple potentiometer consists of a length
Of two or metres of uniform resistance wire mounted on a board between thick brass or copper strips of negligible resistance. A millimetre
scale is fixed to the board for measuring the distance from one end of the wire to the position
of a sliding contact or jookay to which a
galvanometer is in series with it.
working battezg
Ε1
and cell
G
unknown ®, B. C. can be found by camps : it with that of standard sell. Sash ball is, in tura, connected with its positive terminal sensitive centre-zero galvanometer, G, and a slider, T, which slides along the wire aŭ užij the galvanometer gives a cull reseing.
If by and E, are the e.m.f.s of the known cell and the standard cell 'respectively and l. and the corresponding lengths of the potentiometer wire for a balance.
€
li
then
The principle is based on that no passes through the galvanometer means
current
that the e.m.f. E la balanged by a voltage drop E1, of equal magnitude alang the slide wire. 5 • ¿' and E 18 proportional to
LONG CÔNG
1
2)
1968中文中學會考試題預習專欄
英文科(廿三)
XXIII
Answers to‘Exercise÷XIX:
Translations:
何玉柱•
1) Suggested translation from English to Chinese:
健康看即体魄的强壮,是一種無復宝 富人的相遇時、地切時会「あせるい?」今 安保愛子如何?(這那の有一段時間を張 舒服的人的问句
「健康かる」道に浤喜正ぬ意思な健康情 14313,42 70 μg jl thus i ž 124 phot 健康情形平常或不好衛生的食物及規律 的生活引改健康情况好的(要素)。如果 10K 47ER, VERZIAVE DE, Seg. askRuta Aroyos of 16 us it is B. 他就是過的規律的生活。
多數文明的國家裡,政府都有一個特例 的部门等门负责人民保健工作站,這個重要的 部门要管理监督如居屋建设、供应,溝通清 隙衛設施やら及食水在等等公共事務
Suggested translation from Chinese to English;
One day, while I was walking along Nathan Road I sud.. enjoying the window decorations of shops,
As I looked denly felt someone pulling my sleeve. down, I saw a little beggar who was about eight or nine years of age. He was looking pleadingly (earnestly) at me. When he saw 1 was looking at him, he immediately dropped his small hand and whispered respectfully, "Sir. pray give me twenty cents to buy bread."
As he was quite pleasant looking, I asked him with interest while feeling for my pocket-book, "Why do you want twenty cents?"
"Because my mother is sick and my sister is
vant to buy two loaves emall; they are hungry. I
of bread for them."
"Aren't you hungry, then?"
I took one dollar out
from my pocket-book and handed it to him.
He stared at my hand, swallowed his mouth-water, then answered firmly, "I can suffer; let them eat First. Sir, please wait here for a while, I'll run to buy bread and get your eighty cents change back. It won't take long."
Holding him back at once,
На Even to this
I
was greatly moved.
I told him the whole one dollar was for him. hesitated and stood there, stunned,
day, I cannot forget that expression on his face. Comprehension!
1) According to the writer, only lucky people and
those who look poor may not be robbed by pick- pockets.
21
3)
Pickpockets keep themselves from being caught by trying not to be noticed.
"Grift sense” is the never wrong aoility to know (predict) what a person will do next.
▲ troupe is a group of actors and
Baby
actrasses.
6)
Pickpockets are most likely found at places unera Sporta events take place and around department- store escalators, at bus and railroad stations. It takes many years of practice to become an pert pickpocket.
N
No aurrent passing
Hadial field undisturbed
Garrant pasirings \
the resultant field gives
rotating torque on the coil
S
The lines af force eat up mohanical Foros D
on the sides of the coil. The two forces together form a deflecting couple which causGE the coil to rotate mtil the deflecting couple is just balanced by the opposing control comple (6 and 7) and the daaping torque due to the addy current aet un as the aluminium former suta the field,
The function of the soft-iron cylinder is to concentrate the lines of forms radially in the annular space providing a uniform field. This ensures that the deflection will be propor tional to the current and so gives the instrument
linear scale.
Resistance of the meter * 9 ohmo.
* 50 mA. Maximum current pas EOS
- 0.05 amp.
Voltage endures à 0.05 x 5
= 0.25 volts.
50 mA
52
2
1. volts
When the length of wire in the potentiometer that gives a balance la 125 cm,
of this portion of wire is R.
125
200
the resistance
8)
If I want to keep from having my pocket picked, the common sense" points I should remember are: A. Take only the amount of money I might need with ge.
B. Never put the money where others can easily age or take.
Be aware and alert where
ever there are crowds.
REIC LIBRA
1.4 ohma
1.25 x 2.2 ohma
It potential dro (where 1 is the current
wire)
volts
potentiometer
• Ele..f. of Daniell call)
•
1.25 x 2.2
- 0.4
Ana, The current flowing in the potentiometer
18 0.4 amp.
Questions for next week:
45. (a) Two wires bang side by side bat got touching.
State what happens when electric currenta flow through them in the same direction, (b) Describe and explain the setion of an
electric bell,
bb.
(c) & ball takes a current of t amp, from s
battery of two cells in series. Each cell has an e,a,f. of 1.5 volts and an internal
resistance of 1 ohm. What is the effective resistance of the ball? What ourrent would the bell take if the cells were arranged in parallel?
(a) A simple transformer consista of two colla A and B would on a bar of iron; eoil a carries an alternating current. Explain the following facts: (1) the terminala of B have a potential difference which is aặbernating, (11) the bar of iron becomes hot. (111) Ir the transformer is placed on a sheet of iron, a humming sound is heard.
(b) Calculate (i) the heat produced per minuta in a resistance of 11.0 ohms when the potential difference between its ends is wk.0 volts (11) the resistance which, connected in parallal with 11.0 okul, gives
■ combined resistance of 10.0 ohmm, (iii) the length of nichrome strip, 2.00 mm wide and 0.10 mm, thick, which has a resistance of 12:0 ohms,
(J • 4.19 joules/cal. Resistivity of
nichrome = 0.ɑcollo obmeam. )
9)
C.
A most skilled pickpocket usually aims at "pit pockets"--the inside breast pockets abere most men keep their wallets.
a. a888tmmability; qualification
b. apt--suitable
c. fend--keep
d. show off; display e. instantly--at once
From the issue on. I will point out some most CORDOR- ly found errors.
Exercise XX:
Correct the errors la the Foliowing senteno est
In our school there have twenty-four claasrenna,
Every students are happy to have holidays.
English is one of my favorite subject.
1.
2.
He is a very clever and kind.
3.
4.
Tom, whom is my friend, are very lazy.
5.
6.
7.
8.
9.
The man who specialize in something we call him le a specialist.
My friend has a kind heart, brave and hard. "Student" is a name which given to a person who studies.
He is easy to do that exercise.
10. This is the same shirt which I wore it yesterday, 11. " are very interesting in music.
12. The boys make fun to the girls. 13. I will do it as possible as 1 can.
14. He never comes to school on time byt always go to
home early.
15. Students are not go to school in sunday.
16.
You must to do your exercises again, because you ought not have made them dirty. 17. He must gives up to smoke. 18. Students stop to talk as
into the classroom.
teacher 19. We often ask our
to say 20. My mother called me buy some rice 21. This house is built by stone. 22. Bis friend is a good man who is a merchant went
Japan last week.
Goon aa the
teacher enter
story to to her.
to
23.
Although he was poor. but he often helped others« 24. Be asked me as my father at habe.or not.
RO
one
25. I could never understood what was he talking about.
too difficult that 26. This exercise is
can do
it.
27. It wa tben.
CAO
when everybody was expect to meet
28. folves like dogs; they are from the sage origin. 29. Many of us are like to swie.
10
30. Don't afraid that you can not gat; therë, 17 yen
don't lost the way, you will get to there.
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