1972-02-01 — Page 22

二頁二第張六第日七十月二十年亥辛歷豆

WAH KIU YAT PO

曰くく

報日橋

*

1 c.c. or pure water at weighs 1 gm.

Specifio gravity of the mixture

0.778

0.77

The compositon by weight of two alloys is as follows:

1972英文中學會考試題預習專欄:

Example

駱道英文遭院主編

數學科

(十四)

Mathematics

(Lesson 14).

Solution to exercise

1) In 5 min. the 18t man walked

4 miles x

iles

In 5 min

the car travelled

Ź

12.

ma

miles.

3:05 p.m. the distance between

two men 19 (4

4+ piles.

1 hour, the distance covered by

either (4 + 4+) miles

8 miles,

I The two men can shorten the distance

B miles in one hour,

42 miles in

30miles.

(2) When I passes the milestone

First kind: copper 22%, tin 670,

antimony 11%

Second kind, copper c2, tin 18%

If thee two kinds of alloys are mixed in the ratio 3:1 by weight, what

copper is there in the mixture?

on:

Example 4

Let 3W be the weight or the first alloy in the mixture.

Then Wis the weight of the second alloy in the mixture. Weight of copper in the mixture

X.

100

of copp

in the mixture

100%

37%

5 men agreed to finish a piece of work in 48 days working 8 hours a day, One ceased work at the end of 12 days and a second at the end of 15 days. The rest then agreed to work 9 hours

a day. By what must they increaDE their rate of work to finish in the specified time?

Slution: Every day, 5 men can complete

WORK

48;

Every day, 1 man can complete

Xis

31

miles

-155

Work

miles ahead.

one hour, I goen (56

miles faster than I.

31Jmiles

12 days, the work comD-

12 leted 18

48

In order to catoh

155

12

miles,

After 15 days,

isted 15

the work comp→

48 x 5

needs 11 houz I

12

The work remained

min.

Mixture

overtakea X at 2150 p.m.

The following are examples congern- ing with the problems on mixture,

Example 1

In what ratio must

at $2 per lb

be mixed with tea at $2.9 a lb to produce

a blend with $2.7 lb?

Solutions On every 1b of the cheaper tea

Example 2

in the blend, the gain is $0.7 On every 16 of the dearer tea in the blend, the loss i8 $0.2

If therefore 21b of the cheaper. tea are mixed with 7 lb of the dearer tea, the gain on the former 30.7 x 2 exactly bala- nces the logs on the latter 30,2 x 7

The ratio is

8 c.c. of a liquid specific gravity 0.65 are mixed with 12 cc. of a liquid specific gravity 0.85; find the specifio gravity of the mixture, assuming there 18 no chemical reaction. Solution By definition, the specifio

gravity of a substance is defined as the ratio of the weight of any volume of the substance to the weight of an equal volume of

water (at 4°C). The spec- pure ific gravity is a ratio only and does not depend on the unite Chosen.

8.c.c. of the let liquid weigh- 0.65 x 8 cm

5.2 80.

12 0.0 of the 2nd liquid weigh

12 Em..

10.2 gmi

of the mixture weigh 5.2 m + 10.2 gm. - 15.4 gm.

of the

fixture weigh

0.77 gm.

(1)

work has to be finished in

15) days

33 days:

the 3 men has to complete

WORK

one man has to complete

WORK

Every hour one man has to co

WORK

Increased rate of working or one

man

0.0005208

8910

1920

0007854 0.0002646

increase

0.0002646)

0.0005208

50.8%

C invest $3,000, $4,000, $2,000 respectively in a business. A and B receive respectively 20% and 10% of the annual profit as Salaries, and the remainder is shared

between A, B and C in proporse tha

the capitals they invested. profite are $3,200, how much does each reveive?

(2) In what ratio must a grocer mix cof- fee at $2,8 alb with coffee at alb so that the mixture can be for $3.3 a lb at a profit of 10% 7

二期星 日一月二年二七九一塞公年一十六国宝·中

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工業學校續興建

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日月村福已來臨的號 - KRUHEXEN

製造更優良的品- 設計人材,支持工界

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倫大教育文憑試

數科設彙積試題

日來有所發展,但由於受

¡BRK-SZKEK

UZBALEGREZ

現。目前,府已在美

RE-KEFRUER

新的一頁綫毀 # 簽個已有多時的廻目計篇:一化製(試題)。 【蘆高之談,此方回將有一帶試科目,同時設有燊心物理(此項科目之 精選撈佳試題,該等利和程裡曾有本科逻控性。

BEREC-RARE THREATKR) - BE÷15 KESK-ESHIKI

FOREX FUNK RECEK BERKEY (2

1月磷行之為大海外政育 普通稳定亦同時没有愛, 一轉訣》在本年六一丁),此項科目設有。

化、經濟、數、物理

工暴院,自從首任校長

程甲高級甜 此項科目之普請程

敦大圣海外女背

於去年制任後,各項計

計在一九七四年完成,

NEBENKERES

CAFESERSER

學院-將可以造就工務一,四: HERSKERERS CETERE-SE BIZNESKEKK NHS BEHEREUKE KREKNERS.

將設立二十何蒸, 搽性試題)

有四千個全日攻二 準八程門,此項科目者,均衆老此考,

BREEKEREN (11)EXCESZ KUE-EXDEKER

1972英文中學會考試題預習專欄

堅道文書院主編

英文科

(十四

English Language (14)

wer To Issue

1. (D) 15 the correct answer.

The Perfect Continuous Tense is used when we want to show an action which started some time ago and is still going on at the moment of speaking.

I have been waiting for three hours." means Three hours ago, began waiting and up to the moment I speak, I am still waiting.

To express the idea that five years ago, when I was in Form 1, I began studying algebra and now I am in Form 5 and is still studying the subject, we may say

I have been studying Algebra. 5 years!

B) is the correct answer.

We choose the Simple Fast Lense here because the Adverb Clause when he was young shows us that it refert to an action taking place in the past. In sentences with an Adverb Clause: time such das

When I was young,

when was a baby when I was in Primary scho

1. etc..

Which all refer to things that happened in the past, the verb in the principal clause should therefore be in Simple Past Tense.

Examples: He learned Calculus when

he was only, a kid. His father died when he Was thirteen: He is no older than thirteen:

(D) is the correct answer.

When we want to show two events (actions) of which the second starte before the first comes to an end, do it like this:

He comes in when I am reading. (I read,

2nd event

event

event

He comes in before I finish reading.

He was practising his singing when saw him. (He was ginờing; I saw him before he stopped his practice.)

(B) is the correct answer

It means that he moved to Hong Kong long before the 2nd World War

nad broken out. He was still living in Hong Kong at the outbreak of the

See No. 1 &160)

(E) is correct.

Usually, we us a rerrect Tense, resent or Past, when we have either ever sentence.

Examples

7. (A

or never in our

nave never walked so far, I have never seen hin again ever since.

(3) is our answer

CONFECT ans

answer.

Note that the Question Mark is for the whole sentence. The first part, Can you explain.....? is. question, but the second part, the Noun Clause, Why a pound of cotton is as heavy as a pound of iron 19 a statement. Therefore, in the second part, the subject, just like an ordinary sentence, 16 placed be- Tore che verb.

Examples: Can you tell me what I

should do?

Will you please snow me

how it can be done?

s statement

is. correct.

This 18 similar to (7)3

Alth-

ough we have, sometimes, words like

'what! how where' eto, an sent- ences, 1 is not always necessary to treat them as a question. They can be in the form of indirect questions. Example: Please tell me what I can do. Tell me where I can find him. Show me how olever you are, (All these are indirect questions

9. (B) is correct,

The word welcome can be used. in three different wayes It can be used as a Noun a Terb. and an Adjective. Example:

welcome him home. (vero) We received a very-warn welcome. (noun)

You are welcome to our party. (adjective)

The difference between- (a) he is welcome" and (b)

he is welcomed' is that in (b) which is seldom used, the sentence is in passive voice. It means that he is greeted by some one...

Other examples:-.

We turn on the light and find that all the windows are open. (adjec-

Jive?

We are quite close to the port station. (adjective.) -

door.

He was standing close to the

(adverb) (Not closed)

10, (D) is correct.

"When 'dare' ie used to mean challenge, at is conjugated regularly throughout and is with 'dared to be its Past Tense.

Examples. He dared me to pasa a night;

that haunted house,

He dares me to pass a night in that haunted house, doesn't he?

When it is used to mean have enough courage, or as a apetal finite, it forme its third person singular with. out

He dare not go into that haunted house Note that dare, in this case, 18 fol lowed by an Infinitive withe out to... Example:- I dare not do 11.

He dare not look at his angry face.

We dare not try, dare we?"

11. (A) is correct. (See No.10)

12. (C) is the correct answer,

13. (A) 19 correct.

14. (D) is the right answer,

"On behalf of -- in the interest

in order to help:

in lieu of instead of.

The difference between and due to":

"Owing to — a preposition

He felt greatly disappointed owing to the failure of his business.

'due to! - used predicatively.

only

It was due to the failure of his business that he felt disappointed,

Other examples-

The accident was, due to his care less. driving, (often used after Verb to Be】 The accident took place owing to his careless driving.

(B) is the correct anewer. Rømember this?-

am interested in the book.

The book is interesting

I feel excited. The film is exciting,