1972-03-22 — Page 19

育教僑華買三筅張五第 日八初月二年~壬感腹

KIU YAT PO

3僑筆

1972英文中學會考試題預習專欄:

1972 中學入學試

NAPA PAGE MA

試題預習專欄

物理科 (一)

1972英文中學會考試題預習專襟

英文科

智慧出版社主編

(-)

(37

化眼科(十一)

ASVERS TO PREVIOUS EXERCISES

SECTIONA

1) An acidic liquid, when treated, with copper gave a colourisas gas which turned brown. With marble chipa at

carbon

Me liquid–15

gave

A. coặc, nitric acid B. dil." sulphuric acia C. cone sulphuric acid D. dil. hydrochloric ac B. dill sric acid.

A black

was insoluble 12 water but dissolved in bydecchovic acid to give a bica solusion, 2 when codice krizorita callezon via ecded to solution B, 3 Dino Rscla itado" was formed whiten duzzied, black on heating. The substance X Was likely to ba

Aptrifurrzc tetroxide

B. cupric OXING

O, Lead sulphate.

D. manganèze dloxica

Es lead dioziaz

3) A whita 6olid d, on head

gave a

colour lege, odourless gca, leaving a white eolid B. B dissolved in water, and the solution reacted with barzum chloride solution to g-vo a white procinte to.

4. calcium sulmita

B. sodium sulphete,

C. sodium bicarbonata

D. celcium bicarbonaTOP

E. sodium carbonate,

white golid A, when heated, gave

■ colourless ges and a yellow roni❤ due in the test tube, Thie, on 0901 ing, became white. A dissolved read ily in dilute hydrochloric acid with evolution of gia to give a molution B. When ammonium hydroxide solution was added to B, a white precipitate formed, which dissolved in a further quantity of ammonium hydroxide,

A is likely to be

4. lead carbonate

B. calcium carbonato

C. lead hydroxide

D. sine carbonate

B. calcium hydroxid

▲ white crystalline solid X was fow to be soluble in water. When dil. sulphuric acid was added to a BOJUM tion of X, a white precipitate was ¡formad, When cono, sulphuric acid was warmed with I, a brown gas was evolved. When sodium hydroxide s01- ution was added to a solution of 2, white precipitate appeared, bút re-dissolved on adding more of the reagent. I is most probably

·lead nitrate,

calofum nitrate, sino ohloride

D♬ lead carbonate

zino nitrate

white ozystalline solid 4 wes shaken with water and the mixture was filtered.. To one portion of tum filtrate the addition of dilute sul¬ phuric acid caused, a white precipi

Sodium ate, insoluble in ex088). hydroxide solution added to another portion caused a faint white precip itate, soluble in excess. Addition of barium chloride solution caused no reaction in a third portion When some of the dry solid A wÁO treated with concentrated sulphuris acid, a white pungent gas was evol ved, which turned moist litaus red, The solid ▲ waa

P. zino carbonate

Q calcium sulphate

R. ammonium sulphite

3. sodium nitrate

. lead chloride.

4 metal, which does not react wisa water, is found to be yoluble in. sodium hydroxide, It gives hydrogen when reacted with dilute acid. 1 losa dot burn and givee no definite colour to a flame, 1.6, no charact iristio flame tast. The metal Ár Likely to

P. copp

gina

lead

3. iron

T. calcium..

Akawera anggested for

21

(1)

(a)

(5)

(7)

Physics (21.

Faraday s Laws of Kisotrolysi etates that:

(1) The mess of au

oiement '11derated in electrolysie is directly pro- portional to the current and to the time for which the current Jasses torougů the electrolyte (2) When the same current le passed

for the same time through several electrolyses, the masses of the various elemente liberated ara proportional to their chemical sữuivalen vide

(b) Potential difference across 2 ohm.

3012 - 31 70 volts.

crrent in the co1)

1.86 12p.

1.098 gm. or copper is liberated by. 1.86 amperes current in 30 minutes.

equivalent of copp

1.098

30 x 60

Coulomb

3.298 x 10 kg/coulomb

trochemical equivalent of copper

0 x 10 kg/coulomb.

18) 0,594 gm. of copper is deposited in

the voltameter in 30 mana Electrochemical equivalent of

snoppar

10 g/could

3.3

Jurrent.

passing

circuit (1

594 x 107

30

the resistance of the coil. "be R cha

Heat generated per second in the

0011 « 122 joules

The temperature of 200 ER OF WASOM riggs at the rate of 0.5°C per minute,

Neglecting heat loss, heat supplied.. to the water per second

200 x 0.5 x 4.2-

60

joules

3 ECTION BIL

Πο

nawered,

日二十月三年二七九一座公乍一十大國民建飞

can and the ghost in furn

Laked whi

vas, ne re- ghost too. are you going? the ghost.

martet,

replied

What is the lengt

the tunnel lyuvelling in oldet

toys was expens

I found the topk 51fficult.

You have to work harder If you try, you

Musceedi

On hearing the bad nove Ma ruched home.

Although Jenat 1 ugl

she is very kind

The boy wa 20. hort that he could not rea

the woll

That student knows how. to reso veli.

10. It ver:

fly

ma soroplane:

SECTION

(multiple choice)

Choose the best answer by drawing fire line across the right box..

Susan and Jane

A. talking

B. talked

C. talkative

D. talk

E. talks

10

0.594 x 10

30 x 60

-J2. ■ 200 x 0,5x

A B C D

60%

6.998

To resistance or une co11 18 7 onas.

(39) Explain the action of a shunt useu

with a galvanometer and obtain a formula for the current through the "galvanometer;

The figure representa an arrangement for measuring the gens, cavity of a galvanometer. E has an E... of

2 volts and 19 of negligible resis- tanoe.

Rana Rara kept constant, 2 and Ry are k their values being 10 ohms and 1000 obes respectively; The resistance of the galvanometer (0) is 90 ohma.. When e 100. ohas. the galvanose-

ter deflection is 100 divisions, Asausing that deflection is propoz tional to current, find in microna- peres the current in the galvanən“. ater which produces a deflection of 1 division

"Assuming the current through the osll remain unaltered, find: ap proximately the value of R. to deflection of 50 divisioni

(40)

One of the picnickers

A. bites

B. a biting.

C, was biting by a shake yesterd D. was bitten Ebit

A B C D 3

00000

The two brothers often quarzo)

of

B. with

for each oth

BC D

00000

A lane.

B. bala

The beggar is C. dumb

D. blind E deaf

he is not able

to hear very well

B C D B

00000

I was frea

B. I did free

5. John asked me if C. I being free

that evening..

D. John was: -free

B. you are free.

A B C D £

500000

SECTION

Read this passage carefully.

sgo muere were not nearly so many books as there are now. Hen did not know how to print, so all books had to be written with pen and ink. Most of this writing was done by the monks. It took a few months or even years to copy one book, and books were very dear.

At last men learned now. To print. The first man to print book in England was named William Caxton. When William was a boy he was sent

In time he becam

to

work in London.

great merchant. He left England and went to live in Germany where h learned the new way of making books, He then came back to England and began to print books himself,

Carton bought strange machines and took them into his house. Soon people in London knew that William Caxton was e printer, and great. lords and ladies came to see him as work.

sinst ASE, Owner men wiss

began to print books. The new books were cheap, so that many people who had not enough money to buy books written by hand, could buy the printed books. Towday even boys and girls at school have as many books as rich people used to have in the days before men learned to print.

sach of the following statements is

About the passage. Some of them true and some are untrue. Fut tick (1) against the ones the are true and a cross ( 12 ); against those that are untrue.

Long ago books were as cheap

are tod

2. All books were written by han

in those days.

William Caxton was the first

English printer.

2. All books in England word

printed by Caxton.

5. People visited William

because he invented strange machines.

6. Monks did the most wr

or books.

William went to China, tò

learn printing,

A. Only rich people bad many books before men learned to print.

William worked in

when he was a boy,

10. It took months or even yearTA

to copy a book,

口

O O O O O O

60

20

8.

The diagram shows a "bridge" arrazm gement in which P, Q are nearly equal resistances and the resistances E, X are also nearly equal, but the bridge is not -balancedi ... It: Le. Found that a balance in

obtained when A is shunted by a rénine tance of 99 ohne. - The resistances are then interchanged and the shunt-ao- rown i now required to balance" the bri» dge is 49 ohms. Calculate the ra ance of X(to 0,001 ohm,) given that I in exactly 1 cha,