HALL三期星日六十月四年九六九一屡公年八十五國民華中
16 APR 1969
育教僑華 真三第張六第日十三月二年己磨豆WAH KIU YAT PO
報日僑華 CITY
文中學會考
預習
The resistance of the
1.8 i 10
物理科
(十四)
·陸永熾
4 x 1.8 x 10-
PHYSICS (24)
Solution
45.(a)
i) The pole at x is a south poles unlike poles
attract.
ii) The connection or the ary cell to the
circuit is shown as in the adjoining diegram.
If the soft iron oore is removed, the strength of the magnet will decrease, this
is because the magnetic flux will leak away from the solenoid.
iv) If some of the turns are removed the
strength of the pole will also decrease. (v) A commercial lead storage cell has smaller.
internal resistance and thus, given rise to larger current. The strength of the pale will become stronger if it is sube tituted for the dry cell.
(d) Let the required parallel resistance wire be
"B obus,
Thay
Lanoth
2.12
4.24
35:33 ohms:
35.33
20
176.7 cm.
The length of wira connected an parallei
176.7 og
46.(a) Let the e.m.f. De E volte, and the internal
rasiatanos be 'r ohms.
First case
Total resistance in the circuit - (2
ohas, ma
E = 0.35 (2 + 1) −→ (1)
Second case
Total resistance in the circuit
(5 + x)
0.20 (5+ 1).
(2)
Therefore,
0.35(2 + x) - 0,2(5 + x
0.7 + 0.35г - 1 + 0.21
0.15r - 0.3
12.
he internal resistance of the cell - 2 chas
jubstitute into (2)
B10.2 x 2
1.4
The e... of the cell = 1.4 volta
Let be the length of the wire and
d be its diameter
Then, the mass of wire,
-- 8.93 ± 7x
·4500 gm.
4 x 4500 18.93
2
(1)
(1) (2)
14.7% x 106 41.8
ས་
22 4 4500 14.7% x 106
تلا
6.93
41.2 10
104
- 6,42 x 10"
The length of the wire is 642 metres.
Substitute into (1)
4500
8.93% x 6.42 r
The diameter of the wire is 1. ma
No matter how the galvanometer is used, the ouzrent passing must be 0.2 x 10-3 amp. when maximum deflection is indicated,
(i) For use as an ammeter (0~1 amp,
A shunt resistance is used to by-pass the excubs current of (1 -0.0002) app.
G
.00028
R -0.99988
0.0002 200
0.9998
200
4999
0.04 on.
enunt resistance of 0.04 ohm 19 used
(11) For use as a voltmeter (0~100 v.)
a high resistance should be inserted in serias to restrict the current
RE
G
IR - 100
400
0.0002
500,000
500,000
499, 800
200
To modify it to a voltmeter a seri resistance of 499,800 ohms 16 inse
Questions for next week:
47. (a) What 18 an electrolyte?
Which are the electrolyte in the following copper, copper sulphate solution, paraffin oil, dilute sulphuric acid, ammonium chloride solution, distilled water?
b) What are the carriers of current ini
(1) copper
(ii) copper sulphate solution
iii) dilute sulphuric acid
(iv) ammonium chloride solution?
(o) An article X requires to be copper
on one side,
(1) Draw a complete circuit diagram showing
how this is done
(11) What precautions are necessary to obtain
a copper deposit which will not flake offr (d) Draw a labelled sketch of a Hoffmann water
voltameter, connected in the necessary circuit. (*) Why le acid added to the water? (ii) Can carbon electrodes be used?"
48. (a) What is meant by cation and anion?
The long in copper sulphate solution are copper, sulphate, hydrogen and hydroxyl, (1) Draw a sketch showing the movement of the
ions when a battery is connected to two emplates dipping into the solution. (11) If copper electrodes are used, explain
why their masses are found to be different when the current is switched off.
State Faraday's Laws of electrolysis.
A copper voltameter is in series with a silver soltameter and a coil of resistance 1.5 ohms. If 0.3 gm, of copper is deposited in 15 minutes, find the mass of silver deposited in
the same time and the pd across the ooil. (Ece of copper and silver/- 0.00033 and
0.00112 gm. per coulomb)33 an
Current passes through copper and water voltametere connected in series. What volume of hydrogen at a pressure of 77.5 on, of mercury and at 15 c. will be collected in tas. time taken to deposit 1.5 gm. of oopper?
$ 15 2x 15 # 育教僑 華
一九六九年
考試題預裝
英文科(廿四)
•王淑方。
LESSON TWENTY-FOUR
16-4-09.
SECTION FTVE
TEST PAPERS
Answers to TEST PAPER II
8
(P)
(10) (Q.
88
TEST ONE ENGLISH PAPER 111)
answer ALL Sections:
SECTION A
Read the fol
the following passage carefully!*
88
When I got to the Kaitak Airport, I realized that the plane from London, on which my sister was travell- ing, had been delayed at Singapore with engine trouble and was expected to be about two hours late. As a rule I can kill my time quite happily, watching the planes land and take off, but that evening I had a headache, which I thought that the noise of the engines) might make worse. I determined, therefore, to walk around to make the time pass quickly.
First of all I went back to the car park where had left my car to make sure that all the doors were locked. The walk in the fresh air did me good, for I felt slightly better as I entered the main airport building again. I made my way to the restaurant, where I ordered a cup of Lemon tea. As I stood drinking this at the counter, I studied the faces of the people around me. Some passengers were onviously anxious about the time, and kept looking at their watches; others checked to see that they had tickets, passports and money. Where there was a group of people, it was easy to tell which one was about to leave. He was the object of everyone's attention and looked either very happy or very sad at the thought of departure. There was one old woman who burst into tears as she said goodbye to the relatives or friends who had come to see her off
When I had finished me tea, I went along to the bookstall, where I bought a couple of magazines, both of them about travel, which would help to make the time pass pleasantly, Then I went into one of the wait- ing-rooms and made myself comfortable in a big armchair I had hardly had time to open one of my magazines when someone came up and put his hand on my shoulder. It was an old friend, who was just about to leave on a business trip to Japan. Since we had not seen each other for a long time, we found plenty to talk about until the arrival of my sister's plane from Singapore was announced.
Now answer these questions from the information given in the passage:
(1) For each of the following words or phrases find word of similar meaning in the passage:
decided
official documents showing travellers identity
happily and agreeaDry
going away
learnt:
(f) proclaimed, gave notes
on
Why did the writer go to the airport? (3) Why did the writer go back to the car park? (4) How could you tell, according to the writer. which person in a group was about to leave? When was his sister's plane about to arrive? Did the write usually like watching the plant land and take offi
(5)
(6)
(7) Did the writer take any interest in the other
people in the restaurant?:
(8) Where was the writer when his friend found hi
SECTION B
TRanslate the following passage into Chineset
One summer evening I was sitting by the open window, reading a good but rather frightening mystery story.
After a time it became too dark for me to read easily, so I put my book down and got up to switch on the light. I was just about to draw the curtains as well when heard a loud cry of "Help! Help" It seemed to come from the trees at the end of the garden. I looked out but it was now too dark to see anything.. clearly. Almost immediately I heard the cry again. It sounded like a child, although I could not imagine how anybody could need help in our garden, unless one. of the boys of the neighbourhood had climbed a tree and could not get down
SECTION C
Translate ONE of the following passages into English:
)能少,學業不成,去學刻,又不成。菜憨之·籍曰:「也足以記名姓而已。一人敵
3.不足學,學萬人敵。」於是項菜乃藪籍兵法,籍大喜,略知其意,又不肯拖學。項梁嘗有
欄防選?乃請飲疑會咎橋哲櫟部發據司馬欣,以故事得白•現殺人,與籍避仇於中
吳中賢士大夫皆出項藥下。其中有大祭及喪藥零錢主難,除以兵法部勒彍客及子弟
*以某駣能。秦始皇帝游會務,该浙江,榮與確俱觀。每曰:「彼可取而代也。』第掩其
• MANGE T. LXW ‹85#]
(B)宋人有其苗之不受而權之者•芒芒然餘,贊其人曰:「今日矣于助苗長矣!」其子嫌 而往現之,則搞矣。天下之助苗長者寡矣。以爲無益而舍之者,不树苗者也。助之長者
,攜㚲者也。非徒無益,而又古之。
No comments yet.
Private notes are available after approval.