1972-01-12 — Page 23

報日僑

育教僑華頁三第張六第 日六廿月一十年辛歷夏 WAH KIU YAT PO

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1912英文中學會考試題預習專欄

1972中學入學試

欧電弧智旅

"Why are you late, Maggie ?" Miss Tan

asked.

Miss Wan asked Maggie why are you

late.

B. King Wan asked Maggie why wer

late.

you

物理科

蒸紅利

(+-)

C. Hiss Wan asked Maggie why she is

lata.

5.6.1

There's a hol your trousoza. Toa

Where? cap” € WAR it."

Look in the mirror, Now can you see it?

"Oh dear? Itla a 134 опе. Please ESEI it, other.

"Are you feeling better, David?” Dr. Lee, akad zy

brother.

Yes, thank you, replied DavİL. 'How's the pain in your stomach?"

the doctor esked.

It's gone поя!" David

'That's good," said

the doctor.

'I'11 dome and ave you again, tom

SECTION

multiple choice,

Choose the correct answer."

„line across the right box:

D. Miss Wan asked Maggie why she was

lata,

E. Miss Wan asked Maggie why she

Late

Who saw the robber? asked the poince.

The police asked who sees the robbe The pollon asked who had seen the

robboz

The police asked who has seen the

robber.

The police asked who would seo

the robber.

The police asked who da sesing

the robber:

B C D E

1000

The chest zaid to the caller.

hold the line.":

A. The clerk ordered the caller to

hold the lins.

B. The clerk requested the caller to

hold the lins.

The clerk bogged the caller to

hold the line.

The olerk ordered the caller

please to hold the line.

The clerk requested the caller

please to hold the line.

ABC DE

SECTION_00

Change the following sentences from Direct Speech to Indirect Speech. Example: Mr. Ho said, "I went

fishing yesterday"

Hr. Ho said that he had gone

fishing the day before.

We must finish our work before dinner.

Faid the two brothers.

The two brothers said

Tom said to me, "I have not sean Stell

since last month

DFAT

Tón told me

"May I go out,

teacher.

Jim said to

Sxamples Mary said. "I am happy A. Mary said that she was capp B. Mary said that no was happy C. Hary said that I was, haspy. D. Mary said that she dy happy.

B. Mary said that they were happy

包□□

David sada, "I don't be.

A. David asid that I déné lor

1 David said that he doesn't EK,

0. David said that he didn't know. D. David said that che dobon mon 3. David said that I didn't know.

B C D

00000

2. other said to Lily, "Will you gó

shopping for me? **

other autod Lily if you will 6 shopping for me.

Bother asked Lily if you will go

shopping for her.

Mother naked Lily if she will co

chopping for her.

Mother asked Lily if she would g

shopping for bes

E. Nother asked Lily If sho would ge

shopping for mo

Σ C DE

00000

Jim asked

Susan said, "Please forgive me, no the

Teng said, "What a fine

Hr. Tans exclaimu

ITT. Change the following from Indirect

Speech to Direct Epssch.

Example:

La said

So Fun all that she felt.

cicke

Fun said, "I feel aid,

at kas vila fis intorsstind

other told. qužckily.

uns onalaren skad

been to Wages,

sae onalaren dadd

Physics

(+-)

(a) The specific heat or a sub- stance 18 defined as the ratio of the quantity of heat required to raise the temperature of any mass of the substance through one degree t to the quantity of heat required to raise perature of an equal

water through one de ten

The specific heat of a solic can be found by the method of mixtures. The principle of the method 19 to heat the solid in a beaker containing water until its temperature is steady. It is then removed by means of a thread attached to it for the purpose, and dropped quickly into a thermally lagged copper calorimeter filled about two- thirds full of water. The lat- Ler is stirred, and its final temperature is noted. Knowing the masses of the water, the calorimeter, and the solid; the initial temperatures of the solid and water, the final tem- berature of the solid, and the specific heat of the copper calorimeter, the specific heat of the solid can be calculated

y applying the "heat lost = eat gained equation to the rest transfer which takes place.

When the experiment is car- ried out as described there are several sources of error. The

hier of these are

Loss of heat by the Calor- meter through radiation, con duction and

6) Loss of ha Onvection

by the hot solid while it is being transferred from the hot water to the cal orimeter.

Transference of not water by. the solid into the calorimete. (4) Heat absorbed by the thermo

meter itself.

Let the Iina temp. be XC Water equivalent of calorimeter:

ate mass) x (specific heat.

of copper) 50 x 0.17

Hence une calorimeter and the 100 gm of water in it will have a total water equly- alent of 105 gm

Heet absorbed by calori meter and water (total water equivalent) fall in temp.

20 ) cal.

105

X

Heat given out by steam

Theat in condensing

in cooling.)

(heat

5 x 540 5(100

X }

Heat Fost to the surrounding

69 cal

But..

Heat absorbed

heat lost

calorimeter.

said mother.

105x

21:00. 60

tby aa nevez

heat given out by steam.

201 60 5 x 540+

5(100

2700+ 500.

5x

5240 47.64

her asked Habel what time it was

?" father asked Kabel,

in told me that he had met Mary the weak before.

Tin said to me

he water rises to 47.6°0

(18)(a) The latent heat of fusion of

a substance is the quantity of heat required to change unit mass of the solid substance: from the solid state to the

1quid state, the temperature remaining constant:

The

latent

heat of evapor

ation of a substance is the quantity of heat required is

change unit mass of the liquia substance from the liquid stats to the vapour state, without change of temperature..

Let x gm. of water in the wei steam

Water equivalent of the calor imeter 218.5 x 0.1 mm.

21.85

Lotal water equivalent of cal orimeter and

and water

(350 +21.85)gm.

371.85gm.

Hest absorbed by calorimeter and water?

371.85 x (239) CAL. 371.85 x 14 cal.

Mass of wet steam

-579- (350218.5) gm. - 10.5 gm.

Mass of

x)gm

of steam = (10.5. Heat given out by steam in condensation

= (10.5 - x) x 540 cal

Heat given out by water inj cooling

10.5 x (100 - 23)

10.5 x 77 cal.

Assuming no heat is lost to the surrounding,

Heat absorbed Total hest, given out by wet steam 371.85 x 14 = (10.5 - x) :

solving,

Percentage of steam

540 + 10.5 x 71

355

later in wet

10.5

22.43%

100%

The percentage of water in we steam 22.4%

(19)(a) Explain what ta meánc

by the mechanical equivalent of hear

(b) A cardboard tube 217 cm; long and closed at both ends contains a quantity of lead shot et: 12.500. It is rapid inverted, 100 times and the temperature of the shot is then found to be 28.85 0. What value does this give for the mechanical equivalent of heat.

(20):

thermometer

voltmeter

Armetez

In the figure an electric heater is shown whose purpose les to provide a coninuous supply of hot water..

Two experiments are performed on it. In the first case the vol- tmeter reads 2.01 volts and the ammeter 7.81 amp. 501.2 gm. of.. water pass through in 22 minutes, and the difference in temperature between the thermometers 18 9.3700 In the second case, the voltmeter. reads 2.21 velte and the ammeter 8.52 amp. the water flow is adj- usted to give the same temperature difference and 607 gm. pass throu gh in the same time as before: Calculate

(a) the quantity of heat lost per

manute to the surroundings. (b) the mechanical equivalent of

heat