1976-03-26 — Page 20

真四第張五第1日六廿月二年丙服复

WAH KIU YAT PO

報日橋業

•**KAKEREKEKES - GERMEKEK) - 花盛放迎風河,小身杪頭唱鵩睛」詩句。就乐舞好,用筆畫勁。每次參展 「桃花、小鳥」陳立峰華 大機長出大畲生。此作,隨有:「挑

(中國藝術會會員作品,本月廿*

「牽牛花] 胡仂石蜂,紅形田大會堂。胡仿石推警案,此作大

KRM-KEF#) ›

-「隱導」熱」作·出大會堂》

: 〔中國美術素會員作品,本月廿六都民

夏鳳

1976中學會考試題預習專欄

生物科(二十),卓唐慕儀

#20

formed. iii. What are some of the ad vantages of the seed 'habit' ? 2

5.A. 1. What are enzymes?

ii. Briefly describe their characteristics with refer-

ence to digestion in mammals." B. The following diagram shows

the contents of an egg.

1. Why is the shell of a por- ous nature?

il. What are the functions. of a?

iii. The central portion of

the egg is orange coloured. What is it?

FICLOGY

REVISION TEST 4:

Staked.ni.

Leaf

Leaf

Cau

The green plant above was kept in the dark for 24 hours. It was then brought into the light and set up. as shown above. The apparatus was then placed in direct sunlight for 6 hours. At the end of this time, Leaf A and leaf B were removed from the plant and tested for starch.

(a) State briefly why the leaves were:

1. plunged into boiling water

for several minutes;

11. soaked in alcohol; and iii. washed in warm water, before they were tested with iodine solution. Y

(b) After the above test was car-

ried out, what will be the appearance of Leaves A & B ? ?

) Briefly explain these results.8

Why was it necessary to keep the plant in the dark for 24 hours before starting the experiment?

What are some of the precau- tions you would have to ob serve in order to ensure that the plant had been suitably prepared for this experiment? 3.

2. A. Distinguish between chloro-

phyll and chloroplast..

B.

B. Explain how energy from the

sun becomes available to a mammal such as man through the agency of the green plant?

14'

1. What is a parasite? ii. By reference to a

named exemple, discuss the characteristics of its mode of life.

10

1 What is meant by symbiosis? 3 11. By reference to a named example, briefly show how this is carried out.

Many insect-pollinated flow- ers have elaborate and pre- cise shapes and seemed to be specially designed for cross-pollination by a par- ticular type of insect. An insect-pollinated flower such as the Snapdragon is aided by the Bumble Bee to carry out its cross-pollin- ation.

Briefly explain the adapta- tions which ensure this to

be successful?

** How

The positions of stamen and pistil appeared to suit self- pollination in some flowers, and yet this is not so. do some flowers prevent this? 1. What is a fruit? 11. Not all fruits are deve- loped from the same part of the flower. Using 2 named examples, explain how 2 dif- ferent types of fruits are

Shelle

Shell

men brine

1976中學會考試題預習專欄

物理科 (二十) 何耀明

PHYSICS

Solution for last week:

1(a) The wavelength for the fundamental

note of the transverse wave in the string

=(2)(20) = 240cm..

= 2.4m.

the frecuency of the fundamental note = 60HZ

the velocity of propagation of the transverse wave in the string

426 m/s.

The linear density of the string

30 x 70-

the tension in the string.

5+840N

the velocity of sound in air

330 7/8 and the frequency of the note = KOH

the wavelength of the fundamen- tal note heard by the ear

330 60

(d) The length of

the organ pipe opened at both ends

(wavelength of

the fundamental note) =(%)(550)

275cm.

550cm..

N

L= 275 cm→

The wavelength of the fundamental note emitted by the organ pipe closed at one end 4x275 100cm. = 11m.

the frequency of the fundamental note emitted 730

30Hz

the second overtone of an organ pipe closed at one end

Sth harmonie of the note

the frequency of the second over, tone from the organ pipe closed at one end

= (5) (30)

150Hz

2. From the table, we obtain

Frequency (Hz) Tension

(gf) (Tension)

(gt)

320

384 .256

1600 2500 3600 6400

512

50

རྦ་

For songmeter; f =

695

60

JUKOKE

:八中國美術會會員作品,本月论

五期星

日六廿月三年六七九一醫公年五十六國民中化交育教

長業藝雜、

炒雞絲

实R

微弱

年個

兩個藝術團體 年會選舉結果

華僑文化

長報告去年的活動,一

***K* - B

̇何一任務;非

非王司是人失、

REDSHKK-K

-- B-1R TE NEU CHEN

仙、克之、梁曼。 沃利芙夫人;粘

大雪堂奉行).. KEILLENT• 体秀動,難而有之。白黑出岫,飛湯拂落,真有一種磅轉氣勢,景致絕 陳華之「山水」獄,參加香港中國美術畫作品年長。其所作煩美之 、「山水」陳華 中國美術會會員作品慶,本月廿六日起,在

吳伯英「書法」 「中國美

Hence a,.

araoh of fre-uency vs square. root of the ension gives straight line As shown below

Frog.

From the graph, the tension when the frequency ia 490Hz is seen to be 75 5625gf.

Question for next week

1(a) State two factors that affect the

velocity of sound..

(b). A boy on a ship hears the sound of

a signal gun fired at the shore 2 seconda after he sees the flash. The ship is situated between a cliff and the shore and is 682mi from the shore (1) Calculate the velocity of sound-

in air. (15) If the velocity of sound at 0°C

is 331m/8, determine the temper- ature of the air.

(iii) If 2 seconds later, the boy on

the ship hears the first echo, find the distance between the shore and the cliffl

2(a) The diagram shows what is observed when two steel pins, AB and CD; hang: from the north pole of a strong mag- net, NS. Why is the distance BD gre- ater than the distancë.

AG And what does this indicate regarding the condition of AB and CD?

(b) Explain why the soft irons can help two magnetic bars to keep their mag- netiàm strongly."

3.(1) Explain what is meant by the

angle of dip' .

(11) What is the angle of

- dip at the magnetic equator. (iii) What is the angle of dip at the

magnetic poles of the earth? (iv) State the relation between the an-

gle of dip and the horizontal and vertical magnetic intensities.

(v) Describe a method of magnetizing a bar without using a magnet and give a diagram showing the volari- ty which would be obtained.

1976中學會考試題預習專欄

化學科(十九)

李國榮

CHEMISTRY (19)

1. Which of the following changes occure in the electrolysis of cold concentrat- ed andium chloride solution with carbor electrodes?

Product at the anode cathode

A Ha

B. Cl2

G. C12

D. 2

E. Cl2

sodium deposited

changes in the electrolyte

no change becomes acidic

becomes alkaline

..

becomes acidic becomes alkaline

2. The element with atomic number 11

will most readily combine chemical-

ly with the element whose atomic number 18

0.10 D. 14

9 A. 6 B.

E. 19

3. A test tube contains a few drops of

one of the following, Ammonia solution in added drop by drop. A ppt. is form-. ed which does not dissolve in excess amgonia solution. The test tube must therefore contain

A. zinc sulphate solution

B. dilute acetic acid

C. iron (III) chloride

D;

cooper

禁、交:永齦研妮胡美

妮码、務3俘會人完

在鐵主堂:

(IT) sulphate solution

E. ammonium chloride solution

4 A sample of lead (II) nitrate was

heated until decomposition was complete

The gases) evolved wae/were

A. nitrous oxide B. nitrogen monoxide C. nitrogen dioxide

D. nitrogen dioxide and oxygen

E. nitrous oxide and oxygen

5. In this reaction ZKMn0, +1601

2K C1+PMnCl2 + H20+5C1, the oxidat

number of manganese change A. +? to +2 B. +3 to G. -7 to +2 D. to.

E. -3 to -2

from

6. Which of the following oxides could not be reduced to the metal by hydro- gen?

P. copper (II) oxide

Q. lead (II) oxide

R. tri-iron tetroxide

S. calcium oxide

T. mercury (II) oxide

7. When ammonium chloride is heated, it

P. undergoes thermal dissociation.

Q. ie oxidized by air

R. decomposes into its elemente

8. explodes violently

T. melts to a liouid

9. Which of the following gives the cor- rect arrangement of the metale in acco- rdance with the electrochemical series? P. Mg, Zn, Fe, Cu, Ag Q. Zn, Mg Fe, ∙AB.. Cu Ag Za

R. Fe, Mg. Cu,

S. Mg, Cu, Fe, Zn, Ag

T. Cu, Ag, Fe, "An, Mg.

The blast furnace is usually used for the extraction of

P. aluminium from oxide ores

2. comper from carbonate ores R. iron from oxide ores

5. magnesium from carbonate ores T. calcium from carbonate ores

10. If you suspect a liquid consists of molecules containing at least two car- bon atoms linked by a double bond, which of the following would you choose to confirm or disprove your suspicion? P sodium

0, acidified potassium permanate.

solution

R..phosphorus pente chloride

S. dilute sulphuric acid T. oxygen

*** Which of the following properties

are characteristic of non-metals? I dull surface

TI. ductility (i.e. easily drawn into

...a wire)

III. good conductor of heat

IV. non-conductor of electricity.

A. I and IV only. B. II and III only

C. I, II and IV only

D. I, III and IV only.

F. I, II III and IV

12. 25cm of sulphuric acid which con-

tains 9.9gm acid in a litre of solution neutralize 50cm3 of sodium hydroxide. solution.. The molarity of the sodium hydroxide is

A. 0.1M D. 1.OME 2.0M .

B. 0.2M C. 0.4

14. What is the least weight of ethanol

that must be dehydrated in order to tain 5,600cm3 of ethene at 3.T.P.?

A. 5.gm B.1.5gm G. 23.0gm

D. 28.8gm. E. 45.0gm

14, Which of the following will give out

light energy?

A. mixing of silver nitrate and sodium

chloride solution

B. dilution of concentration sulphuric

acid

C. combustion of magnesium in air

D. adding dilute acid to sodium carbon-

ate

E. formation of water from hydrogen. and

hydroxyl ions in solution

5. What is the least weight of sulphur- ic acid containing 80% by weight of H2SO which would be required to disso- lve 16.2gm of zinc oxide?

A. 2013gm

D. 24.8gm

B. 2.4gm C. 23.8gm B. 26.4gm

Answer to last week's nusations »

1. E 2. C

3. B

4. C 5. D

7. A

R. D

9. D

10.B

11. E

13.0

14. B

15. D

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