1980-01-10 — Page 39

育教僑華買三第張十第三日三廿月一十年未己曆夏

物理 (十四)

3.(1)

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Physics (14)

W. K. Lo

(Mill & Dale Press Ltd)

1.(a) Assume x kg of ice

are melted.

Assuming no heat loses

to, or gains from the

surroundings

(0,2)(420)(20-0)

+(0,8)(4200)(20–0)

#336,000x

x=0.23

Therefore,

the critical angle

*= 0.625

WAH KIU YAT PO

報日僑

(b) The actual frequency of

the tuning fork is

greater than the

approximate value

obtained in (a) because end-correction is not

taken into account în (a).

(c) The direction is along

the axis of the tube.

(d) 0.5m, 7.5m and 1,25m from the open end

四期星

(cos(B+C) -COSA

tan(A+C) tanl

B+G.

CUS

7. Which of the fullowing is

equivalent to -2 < x < 72

A.

B 3(x-2)

52

-X+

日十月一年〇八九一曆公年九十六國民蔽中

38 4.1

180 -60

(十四)

the figure,

120

明德出版社交波提供資料

180

0.3 - 0.23.

7kg

of ice is stil

8+38

180

C. P. Man

unmelted..

21

Exercise 6

(b) Suppose ý kg of steam

are blown into the

to 20°C

Heat evolved by steam

-2,268,000yst

-(4200)(80) y

=2,604.

000y

Heat gained by the

gini

1,6

Mathematics (14)

(MILL & Dale Press.

Multiple choice questions;

1. If x

5z, then

mixture and raising

= 1.6sin21 19

≈1,6x0,3636

A

315.

0.5818

35o 29'

20; 8 = 18 16

D. 1 : 3

C. 1. 3. 15

D. 1 15.

In the figu

5

TH and K are tangents to the circle UK, if UITK ZUPK is equal to

A.56

R. 59

G.

D121

E. 124

circle, centre 0 touches

the sides of a quadrilateral

which of the following is

not

true? -

A. POUS.

is cyclic

B. [POQ+/ROS=180°

C. [F+[Q+/R+/S=360°

D. 00 bisects (PQR E. PQ+RS = QR+PS

14. The value of 10

A-1

B3

15. Which of the following is

not 8 G.P.

A-5, 10, -20, -40 R6-18

54, -162

45.

calorimeter and its

(b).

contents.

m =

=0.07x(336,000)

15cm

+(1.2)(420)(20).

16cm

0.25 0.3333

+(0.8+0.3) (4200)(20)

18cm

0.5

#126,000

2,604,000 y = 126,000

Y = 0.0484

20cm

0.6667

30cm

1.5

LABC 90

36cm 2.0

Ans

0.0484kg of steam

The length of AB

48cm

3.0

are

e required.

60cm.

4.0

(a) Let the correct length

bé x m

- 1+(1+0.000,02130) =1.0006

Ans: The correct length

* is 1.0006 m...

The coefficient of.

cubical expansion":

of glass

-3x0.000,009 -0.000,027° C

Capacity of the flask at. 100°C

=50x(140,000,027x100)

50.135cb00.

Let the volume of

mercury required be Ven

V(1+0,000, 18x100)

50.135

Since

the slope against vis

50.135

1,018

49.2485cm3 Ans

From the graph,

Apply the formula

slope

12

1.

(1+rt)

12

12cm

the density of water at 54 °C

1000

1+0.0005*50

1000

-1.025

975.61kgm

(ii) Coefficient of

Ans

cubical expansion of glass

=3x0.000,008)

-0.000,024°C=!

Volume of water contained

capacity of the flask at 54°C =1000(1+0.000,024x50)

1001.2cm

33. -1.0012x10 m

Mass of water in the

flask

=(975.61)(1.

„0012x10 ̃3)

Ans

≈0.976,78kg

1980 中學會考試題預習專欄 英文科(十三)

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ENGLISH [13]

TC Rebeiro (Foundation Press)

Dear Students,

am

In⠀⠀ response to your request, presenting two model essays of contrasting style and content. Pay special attention to any word or idiomatic expression new to you. As I have said many times, don't memorize vocabulary or idiom in isolation; instead, learn how it is used in the context: Notice the simple English being used. Always bear in mind that simplicity and accuracy is the key to success in English composition in the HKCEE. As a matter of fact, my students who scored A in English in the Certificate Examination wrote simple English. If you are in the habit of writing long, complicated sentences, you should drop this harmful practice now before it is too late.

In the fi

16.

D.

E. nh, hhh, khhh

when divided by Y, gives

a quotient 7 and leaves remainder R; find H in terms of X, Y and Z C. X-YZ

A. K-Y-Z

D. X+YZ

PA

1}. XY+Z

A. 15cos50° cm

B. 15ain50° cm

C. 15tan50

159in40"

sin25

OPQR is a rectangle inscribed in a quadrant OAB, centre 0. If DR-5cm, RB-8en, find the area of the rectangle in sq.em.

VAL 25

C

B 40

C, 60

D. 65

7. In the figur

15tan40°

sin25"

If loga+logb - log(n+b)

he value of a in terms

E. 96

10. In

E. XY-Z

ST//QR, ST-6en, SH-4cm, HR SC

10cm, the PS is

22r (r4h) then h equal to

-2xr 2xr

BE and CE are the bisectors: of ABC and ACD respectively

If {BAC=50°, the [BFC is

D

E. cannot be determined

11 If the 3rd term is 1 and the

6th term is −27' the general

erm of the G.P

A. 9(—)-1

B. 9(3)**

c. 9(-4)-1

D. 9(~3)TM~1

ст

D. 8.4 cm

E. some other values;

18. If sinjx - cos2x then x equals A. 90

B. 72

654

D. 36

E. 18.

19. The rate of working

of A, B, C 18 a:b:c.

If they all do the same piece of work separately, the number of days required

is in the ratio of A. a

bac

B. chia

ab

E. ca: be ab

20 The three sides of triangle

are 2 cm, 6 cm and 2/2 cm, then the smallest angle of the triangle is

ADS.

2. 천

A-2xr

5.(a) Let the appromimate frequency be f, the wavelength of the note emitted be X (approx.)

L= 1.25

As shown in the diagram,

L

1,25m

The approximate wavelength

A1m

The approximate frequency

velocity of sound in air approximate wavelength.

-330

= 330 Hz

Ang

Describe a visit to a place you do not like.

I was stunned, when I entered a hair dresser's yesterday, to find myself face to face with people who looked like gangsters in uniform. No sooner did I turn back than a surly-faced fellow pulled and half dragged me to a chair. I tried to escape. It was too late. A hairy hand had me by the shoulder and pressed me down again. From the mirror in front of me, I found a giant with eyes as cold and hard as steel wrapping me in a piece of cloth. The instruments with different shapes filled my Imagination with the wildest ideas of what might happen to me. Were they going to dissect me?

The man held an electric machine with a sharp blade near my neck. I trembled and shut my eyes. When I opened them again; the man wielded a pair of giant scissors together with a pointed, serrated instrument. Then he took up a knife, waved it in the air and brought it down as the executioner did with his axe. It was like a whip in the air above my head. I lost my senses.

A pain like that caused by cactus pricklea woke me to fuller consciousness. A rough- looking guy was grinning in the mirror and scratched my head with his long fingernails. As if it were not enough to satisfy his sadism, he had my head nearly broiled with boiling. water. All this time I had felt the ground was coming to meet me. What agonized me most

•2&r 2xr

25men working 8hours a day remake a road in 63days, the time taken for 45men, working T hours a day is A. 5 days

B. 8 days

C. 40 days

D. 20 days

E, none of the above

6. If A, B, C are the interior

angle of a triangle, which of the following is false A. sin(A+B) = sinC

B.

COS

A+C

was the intense heat that pierced my heart like millions of pins, from a steam-generator. Tears. rolled down my face. I suddenly found I was no longer tied up. I jumped out of the chair and having laid down ten dollars ran home as if the devil were after me:

Vocabulary

:stun

dissect grin

intense

gangster surly-faced hairly

agonize

wield serrated executioner

sadism broiled

Idiomatic Expressions

"in uniform

to have somebody by the shoulder to fill one's imagination with to lose one's senses

to woke somebody to consciousness as if the devil were after somebody What arguments would you put forward to endorse the opinion that after they have finished Form Five it is better for students to have a few years" working experience before going to a university.

Is it a sound, idea to leave school and immediately begin three or four years of specialized study? Are we creating barriers between the majority of people, who start work as soon as they have finished Form Five, and those who take their first job at the age of 22

E. −9(−3)^-1

12 A rectangular pool with dimensions a and b is bordered by a path of uniform width w、 the area

he path is

A. (a+w)(h+w)-ab B. (a+2w)(b+2w)+ab 0. 2w(ash)

D. 2w(2w+a+b)

2 2 B. a +b +2abw

13 In the figure,

after having graduated from the university? Life in the library or laboratory or dormitory is very different from the world of work! At 22 a man or woman is an adult both intellectually and physically, but too many highly-qualified people in our society have a child's idea of the world. Earning a living, taking short holidays, working factory or office hours, co-operating with junior and senior colleagues: these are all important aspects of working that many students or recent graduates don't know. They become isolated from the rest of society.

The maturity acquired say during three or four years at work would no doubt stand students in good stead during their further studies. The stay at university would be something they had really looked forward to. The difficulties encountered at work would have inured them to the problems of life in general and they would thus be better equipped to cope with the demands of intellectual efforts. Young people would have a choice in the work they wanted to do and they could change jobs if they wanted. They would be encouraged to try manual or factory work as well as the more comfortable life of an office. Perhaps the students-to-be would find that the years of work could help them in their choice of career.

I know

2 work experience scheme. sponsored by the Government would need a lot of organisation. We would have to decide how

4.

15o

B. 500

450

60o

16

ANSWER:

17E

2. B

17.

3. A

13

18. E

14 E.

19. D

5. C 10. A

15. E

20 B

much money these young people could earn, and whether to enforce the scheme by law. But those years of working could be more valuable than four years of studying for the individual as well as society.

Vocabulary

specialized barrier intellectually physically

maturity inur Idiomatic Expressions

to stand somebody in good stead to look forward to

in general

to cope with.

manual

Answers to last week's exercise.

1. A 2. B 3. C 4. A 5. D 6. A 7. C

8. D

11. C

21. C 12. B 22. B

31. D

41. A

-32. A

42. A

13. B

23. D

33. B

43. D.

14: D 24. B

34. D

44. B

15. D

25. C

35. C

45. C

16. B 17. A

26. D 36. B

46. A

27. A

37. C

47. B

18. C

28. C

38. B 48. D

9. A

19. A

29. B

39. C 49. C

10. A

20. D

30. B

40 D

50. A