1984-04-12 — Page 15

育教僑華 頁三第張四第日二十月三年子甲曆夏

WAH KIU YAT PO

郭日僑華

四期星

B. 12 cm

b-16

in 初中成績評核預習

雄風出版社

3. Which of the following

numbers is corrected

1-4

present age.

A. 10 years old B. 12 years old

C. 13 years ol

sin 60

日二十月四年四八九一圈公年三十七國民華中 tan 60®+cos

sin cm is

·A. 27.

B. 49

C. 64.

125

E. 216

to 4. significant

figures?

數學

(五)

A. 0:457

MATHEMATICS (5)

1. Find the length of AC

6.96 cm

B. 11.51 cm

C. 12 cm

D. 13,6 cm

E. 16 cm

Area of the given isosceles triangle

2. 32 cm. Find the length of

B. 2,005

C. 13.047. D. 4240: E. 42000072

There is enough food to feed 200 girl guides for 12 days. If 40 more guides join the camp, how long will the food last?

A. 5 days K. 9 days

C. 10 days D. 15 days E. 20 days

5. Which of the following

is true? A

A. (a−2b)(a+2b)=

2

a-4ab-4b

2

(a−b) -a2+4ab+b2

A car has travelled 75 metres in 25 revolutions. Find the radius of the wheel of the car

2 cm

cm...

D. 14 years old E. 18 years old

B.

cm

12. If a=-2, find the

3 2 value of

A. 13 C. -8 .13

E. 14

16. Find the value of

·B. 11 D 5

em

9. There are 1200

students in a school. of which 55% are girls. The ratio of the number of boys to the total number of students is:

A. 11:20

E. 20:9

C. 11:9

-6ạb

C. (2a-b)(5a+5b)=

2

2

6a-5b-6ab

2

(Ja+b) -Ja +6ab+b

E. None of the above

Sólve for y. -Y-2-y

10. Simplify;

B. 20:11 D. 9:20

right angles

B. 3 right angles €74 right angles. D. 5 right angles

E. None of the above

A man saves $6 if he pays $44. for an article. It means that he can get a discount of

C 1000 E. 140°

B. 80°

1205

If sine:

then

WIN WIN

WINAT

A. 8/2 cm B. 53 cm

C. 45 cm D. 8 cm

1984

中學會考試題預習專欄

物

(廿九)

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生

BIOLOGY (29)

UM LEUNG!

MILL & DALE PRESS LTD. Unit 10: Revision Test 7. Nine seedlings were

grown on wine bottles as shown in the diagram-bakery St

bottles contain deficient culture

solutions, one

contains complete culture solution, and,

the remaining ne contains distilled”

water. The results were observed after several weeks.

Rubber

stopper!

·Cotton- wool

(1) Suggest,

•Seedling

A... C.

7. If b-3(-2)=10, then

the value of a

terms of bis

.B.

State an

importance of 41° nitrogen, (2) potassium and (5) magnesium on

normal growth of

The diagram he low

shows the anterior part of the human respiratory tract

Nose

Mouth

{ r

(1

Glass

bottle.

What OTAS

Esophagus

Trachea

the function

Why does the wall or R contaiuva rich supply of

blood capiliaries":

State two types of cells, lining the wal oftrachen.

What are the

importances of the ser cells?

(iv) What sense is the

roof of B

•Culture

solution

for, distilled

water

with

(vi)

reasons, LWO

corrections you

would make ta

improve the

experiment.

Why should newly- germinated seedlings be used instead of older plants"

responsible for? (1) State two

respiratory diseases which can be induced by cigarette smoking. (2) State a substance

in cigarette smoke.. which darkens, the lungs of smokers.

vii Bow is food.

(iii) What is the dis-

advantage of using one seedling in eatin set of water culture experimentsansver Name severn macro- elements which

Mela ne included

the complete

culture solubion, but excluded a ándividually in cach of the seven deficient cul solutions.

(v) What is the

eral

affect of a deficiency of a macro-element on the growth of seedlings” (vi) \hy is it necessary

to renew the culture solutions every two. vecke?

(vii) Describe an effect of a deficiency, af (1) "nitrogen, (2) potassium and (3). magnesiumi

on the growth of plants other than that. described in (v).

prevented from entering the trachea

1. The bottles should be covered with aluminium foil.

9. This keeps out light

prevents algal

Enovih virich miny

absorb some of the

minerals.

The Flass tube should be dipped

into the solution to vnsure an efficient

The

A man is three times as old as his son now. Six years ago, he was four times ag old as his son was. Find the son's

genes,

Nitrogen,

phosphorus,

sulphur,

potassium, calcium

magnesium

Krone

v) The growth is-

retarded.

(vi) Some of the materals may be depleted

(vii)

1-pale leaves

yellowing of leaf edge

yellowing of leaves

vital element for protein formation concerned in

enzymatic actions constituent of chlorophy11

Anasal käirs: 1, masal cavity Cepiglotti

DC-shaped cartilag

(ii) A filters out the

porticles "in air.

A. 105

15. Evaluate

∙12%

15%

The relationship between volume and. temperature is; Volume increases

linearly as tempera- ture increases,

(iii) To warm the inhaled (c) From the graph,

(iv) Smell (3)

(1) The ciliated cells

and the mucus secreting cells. (2) The mucus produced

by the mucus secreting cells traps bacteria and dust in the inhaled air, and the beating cilia the ciliated cells move fuery up the trachea to the pharynx, where they are swallowed

das phlegm.

(1) Bronchiris and Tung cancer

(2) (ar

物

Ccloses the

opening of trachea

during swallowing.

理

(廿九)

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PHYSICS (29)

x=70°C

The volume,

ficien

of expansi on-

At

-140-100. 100(100-DY

40 10000

-0.004)

The absolute zero temperature obtained in the experiment

18-2500

(Ams.)

(f) No, the expansion of

Lass is negligible. compared with the

expansion of the

enclosed gas.

Haguification

Image...

supply of oxygen for roof respiratio

distance

v. (in m)

MILI & DALE - ARES

0.5

0.5

0.4

1.0

Suggested solutions. 46

солт Revision Test

0.5

151

2.0

017

2.5

0.8

SECTION "R: FEAT,

LIGHT SOUND AND

0.9

YAVE MOT LÒN"

seedlings grow faster so that the Pesult is more apparent, while the older plants, may: have, ngre mineral reserves, which may affect the results,

Li There may be

variation, die

two

19. ABC and ACD are

right-angled triangles. If AB-4 cm, BC-3 cm, CD-12 cm, find the ratio of the areas of AACD to AABC.

0. 3 E. 5

20. If x:y-2;5, and

5x-3y=0, then the respective values y are

-4, -10

B-2, 15

C. 2, D-4

10

18. If the sun of the

edges of a cube is 36 cm, then the volume of the cube

Magnification

Answers:

1. E 6. B 11. E 16. D 2. C. 7. E 12. B 17. D 5. B 8. D.13. C 18. A 4. C 9. D 14. B 19. E 5. B 10. B 15. B. 20. A

inst· Image Distance

1 1 v0.2

w=0.6.

New Cartesian

n=-0.3.

f=0,2 m

Apply

Magnifica- tion (m)

0.2.

0.8 1.0

• Image distance (ism.) Heal-is-positive

Multiply both sides

m+1

Nex

Cartesian

Multiply both sides

1+m=_v_ ___ m=-v-1

the slope of the linear graph of against v is equal

to - slop of the

gra

0.3'm

G1

(Ans.)

As shown in the figure, since an inverted image 1 of the object is coinside with the object 0, therefore, the image formed by the Tens alone. 1) must

coinside with the centre of curvature Cof the convex mirror so that the rays from the object will incident normally on the

mirror and retrace

back.

Real-19-positive

u=0,3 m

f=0.2 m Apply

Therefore a real image is formed on the right side of the lens if there is no mirror.

The radius of curvature = PC =V-0.1 m -0.6m-0.1m

=0.5m.

(Ans.

The focal length of the mirror

=0.25m

(Ans.)

Since S, and So are equidistance from 0, therefore path difference Hence maximum intensity is received at 0. Constructive inter- ference occurs wher path difference =m, where m is an integer and is the wave- Tength. As lie walks to P, the path difference is equal to one wavelength andTM therefore next maxmium is received.

(11) S1 =√142

iii)

S&P

According to (i)

SP-S.P

=10-8.9444 =1.056 m (Ans.)

=(300)(1,056)

=316.8 s

the speed of sound in air is

516.8 ms-1

(b) Let X be the wave- length of the note emitted

483mm-151mm

=332mm -0.664m v

320 0.664

=482 Hz

(Ans.)

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