1974-03-23 — Page 23

IPERENCE LIBRARY

育教備镑頁三第張六第日十三月二年寅甲屬夏 WAH KIU YAT PO

報日僑華

六期星

CO&NH,為原料,而實際上家用

(7)写出下列各物化學式:

為原料

1874 中學會考試題預習專欄 堅道書院主機

(4)一種結局全希望x受热将秘出一種能力 小蘇打

物理科

1874 中學會考試題預習專█巡,配制本,与和化窥混合机房”社观城

純碱

整道書院主辅

芒硝

化學科(甲)〈十九):林景源

(1)用化學方法鑑別下列各組构资

小鉛、公錦銘(四)鎂(四鉄)

測驗十

硫酸铜及硝酸銅

时间两小将

甲部全(60元)

∙res Ae, (Son) & INSOL

1.分别氯化鱼铁及氯化铁溶液之方法是

(2)简述下列過程中可觀察之现在查时化學方

選擇題,120702

氯化银可溶於(A氫氧化鈉溶液 (B)新硫酸

铁

132 下列五種乾保固体在空氣中可羽子會的退

iD) 氯化鈣,E)氫氧化鉀.

张铁泡時,你物生沉殿。

(A) 氯化钙(B)醋酸鉛化硝酸銀

D)硫酸銅(E硫酸鈉。

(E)硝酸银和食望:

わた空気中桂起物質為

(A)芒绡(8)海波

(Di森打

说,再加入過量之氧水则成语藝色溶液,比

入過量與錢!

(6›加碳酸鈉溶液入硫酸鎂各泡中然後通入

通識入碘化锦高 尖酸钠溶液.

银生锈

鋁銅鉛

特角入遊堂広げ

·以加少量一氧化铅入柿胡族中,捐胶海否 盤鉀溶液

M13) 茲有三種溶液A.B及C 當A与B混合特 生綠色沉澱D久置则专棕色。A雨确酸乘洛 “定混合特,生角色沉殿玉。上了洛冷秤汤酸,但

∵將B滴逛C中,韧特生藍已沉澱F,但再加入 易量B则沉澱淡溶,溶液呈藍色B經持久強熱 则完全氯化方留殘渣

心經持久顶熱,故大红棕色我市G,殘留物為

訓出ABCDEFG及H之化學 |名稱及生成物D E F G H 生成時之程式。

上简答下列各题。

a) a telephone. earpie

It consists of speech coi La

wound round soft iron cores,

with strong permanent magnet behind the cores and a thin soft, iron diaphragm in front. The inconiny speech current is pasin

ed into the colle. The speech current varies in painitude and therefore a corresponding Variat ion in the strength of magnet- iam in the cores is produced. The pull on the diaphragm thue varies at the aôme frequency as.

the incoming speech current. When the diaphragm vibrates": sound: wives of 'the same frequen- cy as the speech current.wre produced. At the same time sound energy is transformed from electric energy.

日三廿月三年四七九一層公年三十六國民中

movement una pq øre mutually ̇perpendicular. By Flemingra right hand rule n inducea e.n.f. long pq is producet. Also an induced o.... is proa-

uced along rana 19 noves down- ward. But the aidea qr end sq do not cut any lines of magnust=. ic induction as they rotate and hence no e.n.f. is abtained":" here. The direction of the cur- rent is constant while pi moves upanded moves down. It rever-

ses as the plane of the roil pues the vertical becue) OG now moves down and rs moves up. Thus an alternating...f. is obtained at the terminals. It changes action every time the coil passes through the vertical.

c) Direct current is obtained by

using a split-ring commutator. The two halves chuunge over... brushes as the coil busses the vertical. Therefore the curr- ent in the external circuit, joined to the brushed continues to flow in the same direction.

11874中學會考試題預習專欄

竪道書院主播

經濟與公共事務科(十九) 徐有制

·E.P.K,

The answers to last week's muli

|ànoice questions are as follows: 3. AF1.2,B 3. C.

6 D 7A 8.09. 11. 12. Question."

13. 14. B.

Describe how banks can create credits and help to finance new business pro- jecte, expand existing business firma In allow people to have tie necess- ary loans to meet their finanoid上 commitments,

Janswer.

Banks have the ability to creave oredit, that is, to expand our money

This economy by extending loans. economic furiction aasiatu business: development and..growth, To under- stand how this works, let us take an extreme example: Suppose in & amall town there is only one bank and the legal tender the town people possess 1s: $10,000. They believe that it is safe and convenient to deposit their money in the bank, all their legal tender in the amount of $10,000 Now everybody uses cheques to make pay- ments and the bank comes to the real- ization that only a small sum of the deposit (i.e. the $10,000 in 1 tter entrusted to the bank)

drawn out for circulation. The bank therefore uses the rest of the de- posit to advance to reliable busine- semen to expand their business.

Suppose that the actual sum drawn out for edhculation is $100. The bank realizes that erefore that if it keeps $1000 in ligus Ikonet (in times the actual amount drawn out) the risk of being unable to meet the demand of its customers for legal tender is very all. 送$1000关注

liquid assets is called the 10,5

reserve requirement (since $1m 33 12% of $10,000)

If a customer à approaches the bunk for a loan to expand his existe.

ing business, the bunk can lend him

wowadaum amount of $9,000 wwjiich 13: he balance of the deposit efter de- ducting the 10f reserve requirement: from the deposit. Of coursey * would have to put up his existing business or other property as security to obtain the loan.

因過量氢氧化钙溶液

含金中必金

IBIAL

(e) Ma

192黄铜中含肉

鋼和鉛

辣和鈇()飼和鲜

(10)在鼓風爐中,氧化铁被可构還原

(B)焦煤

媽口鉄是鉄之表面鍍!! 不銹鋼中含自: 元素

d加

永铁沉游!

用化學香法鑑組锌可銘

((A) 氰離子(B)流传

.融的

(硫水離子(任)硫酸根離子

(2)下列排一碳酸塗受熱分解的不留下殘递!

魯士藍

碳酸鎂.

路資料酸,可能是

·其作用在於和结合成塔·杰狼痒,我化,硫酸鉀,醋酸鉛乙稀溶液。

a.分别通入众化感時那些纸管可生沉感?

硝酸,但與硝酸作便呈弱鹼性持,將何变化?以拉式示

brushes.

4 simple dynamo consiste eosint jelly coll rotating steily in unifor gagnetic field, Working: Consider the coil pqrs mode of four pieces of straight

wire: hen the coil as horizont wal and proved upwirds The magnetic field, direction of

Problems for next we

transformer has 30 and 500-tur ns in the primary and senonohry coils respectively. The secondary coil has 10 amps at 270 volte. Calculate the voltage and the current in the primary cn11. Explain how a diode works.

a) Draw circuit diagram or hilf wave rectification by » dinde. 5) Draw a graph showin, the current

variation in case a).

c) Show by a circuit diagram how two diodes can be used for full-wave rectification,

in

: hasuning t}at A also believes.

sila cheques, The loan:of. S9003 is put back to the bank as deposit` to open a current account. Thus, the amount of cheque money in the town is $19,000. The bank can now make another loan to customer B in the amount of $8100. This amount is arrived at after deducting the 10% reserve requirement: (10%

$19,000-1 from the original legal tender

...

..to make

deposit of $10,000-

can:cons The bank N reserve requirement reaches $10,000 Ioana to other customers until the

which is the amount of legei.pender deposit. We now say that the bank has reached the maximum amount of credit it can create. As a matter of fact, the maximum credit a bank. can create is the reciprocal of the reserve multiplied by the amount of legal tender deposit. In the above example, the reserve la 10, which 191/10 89, a fraction and 10/119. its reciprocal. Multiply tais by

000, we obtain $100,000. $10,0

We have used the extreme ex- apple of only one bank in a town to: 1llustrate now a bank can create credit 'and help busihess, projects. In actual conditions, it is the en- tive: banking syatem waich enables.

the individual banks to do so.

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色情片切,

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見未所前,象景怖恐

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展會人三但本市

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From the producer of "BuiNERS. THE SEVEN-UPS

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THE MAGNIFICENT

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: