1971-06-04 — Page 18

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WAH KIU YAT PO

報日僑華

英中會考地理科答案(續)

英中會考物理科試題

SECTION

GENERAL PHYSICS

(Only ONE question raný be gone from th

BUGGESTED ANSWERS TO GEOGRAPHY (CONTINUED

HONG KONG, CERTIFICATE OF EDUCATION

EXAMINATION

Potion & II

五期星

日四月六年一七九一三年十六國民華中 育活

The diagrsin shows a my of light, metdent on a 60°" glam prtion of refractive indes (14 the second (sos àt the critical ingle

an experiment to flad the coefficient of satte fiction u foi wood on wood the followin resuita were obtained

SKETCH MAP OF INDIA

Normal reaction

SHO MAJOR IRRIGATED. AREAS

[w of wooden block weighis added)

250

300-350 400

450 -500550 600

timing fnctional force Qu

(wi of pan werglits adited)

80 47 100 128

137 343 170

What is meant by the frequency and amplitude of a vibrating nining fork ↑

The distance between a node and the next antinode of an ar estuma si: 0 °C viðaung mủ, ensonance tubs at 175 cm. If the velocity of sound un air 12-33-180 cm/s-ái 0.°C. calculate the Frequency of the wave

What would be the frequency if the experiment could be repeated with the temperature of the se (in the sube at 91 °C-

KEY:

Tanka Wells Kares

Reasons why each type of irrigation is read in the area::. Ferennial Canals » They are found in the Indus and upper and lower, couras of the Garses, at the foot of the mountains. are built across the rivers. In this areas water is obtained. from rainfall brought by the monsoon as well as from melting anow there bre a large, and regular supply of waterala engured. Haters lad to the fields through the candle by gravity. Tanke -- They are found in the south-eastern part of the DecoET Plateau. Mud walls are built across the valley of the amall streame which dry up in the dry seasons, so it only provides water in the wet season. They are used in the more backwart brane becauseft is saay and sponomical to construct, Hella -- They are built where the surface of the land may be vary dry but there is water at a short distance below the surfage. They are found mostly in the middle and upper: Garças where the sedimentary rick holda underground water, “ater is raised and used for irrigating the fields.

Karez -- In some areas, for example in the western part of the Indus Basia, there le « lack of mrface drainage. The olika tə 'is ab' dry that evaporation takes place quickly. Furthermore, tai sirface water is for salty. Bere water is brought by underground tunnels.

Regsong why irrigation is

continent

portance to the sub-

Railfall sa unevenly distributed so over a large area, Falafeli ta vury low.

Owing to the great best, there is very rapid evaporation

(of surface water.

ainfall in geanodi

Plot & graph of Q (vertical axis) against ♬ (horizontal axis)

Uung your graph, find the value of the coefficient of state friction and state the methog. ajed

(1). Name two important precautions which must be ikken in order to obtain good remašta,

Currying out tisis experiment

State Newton's second law of motion in words and show how the equation F= ma's obtained from this law

à small rocket teauy to take oil delo stationary at first le a vertical position by a fixed frame While, still held. Nejects material vertically downward with a speed of 360 m/s if it ejects man of 12.5 kg/s,whal is the force in kgf required to hold it in positiou

When released find its ritualwertical acceleration if its mass at the moment of release being 150 kg

Take the acceleration due to gravity ar 10 m/s2 cor 1000 cm/1) and neglect air resistance

Stau

Use the following expen

data, ne fuho fi) die denity and (ii) the seajth

The frequency of the note em

stretched string 41 320 Hz.

What's the new frequency

SECTION, D

if the length of the string :Z is reduced to L. the tension being kept constana

if the tension of the string 7 reduced to when the

ELECTRICITY AND MAGNETISM (Only ONE question may be done from that sectiona/

an elecrolyns expermenting copper electrodes, if 0·66 g of copper is depos

28 minutes, what is the value of the current?

Given ece of copper la G-00033 C

Name two precautions which are necessary to get a firin copper deposit

(b). An accumulator of em.f. 36 volts, connected in series with a renuntiation, is charged from 60 volt d.c. supply The accumulator itself has negligible reusiance The charging CUSTORM"

ampere

(1) Drew a diagram of the circuit

(1) Explain why a resistance must be included

(U) Find the value of the resistance

(v Calculate the power lost in the series resatance

Calculate the useful power being consumed by the accuonyja

Paineté of sienne

Weight of wire up-a Weight of we

What is meant by the jonincinte, of mnomien

With reference to the above diagrizn

Find the Sentre "gravity of me, then unit, perpendicule distance from the fuses 48, and

metal plate, and, stair in portion

if the dish pe un unes of the plate 5 g/cm and the plate in magiseded freely from 8. war the agritude of the vesically upward, force" Preludcia when applied at-polos 4 wil knee the mde 48 omonta!

Ammeter

the nerfs domes

-The Diate wapended "eely from li what ingte does the ade18 make with a paimu kan

the galvanombor Hos

what are the num

Define the zene near of jamón of ser

in an experumen to fingite specific nett i of's neulo a' a certain amount of jos as a “¿ wa achded 101 copper calorimeter of mass 20 g containing 70 g of quid si, 30°C. The total.mass'or the calorimeter and its contents after the experiment was found so 21, 169 g. If the fing temperature of the mixture was 12. "C" calculate the specific heat of the liquid æt

igation 15 neceseazy in the dry

Givin

Specific neat of copper

talent hest of Húsna, vi com

80 calisi

workeal

Cardboard Sheet placed in s

Thereis great variability of the amount of rainfall from ́year, to your therefore the amount of water in the river cluotuates

ka India is mainly an agricultural country, large amount ef water is required, particularly when the major types of crops areʻrica "and sugar cane which requires auch water for culti

(b) Reasons why food oduction in the adian sub-continent te

insur

fionest

and unreliable

üne vitivable

dor India and rainfall

large areas

Farming Dee Deen prachiasd for a long time in Indi einge Little Fertilization is, applied, the sol beconer prausted. As a result, the uzeld 1 low.

The population of India de dense, partiamiarly in the jultivates arèns' Eberstore the fields are small, áno cannot ge profitably used.

The farmers are 2000 "afford sa 'uae fortiters.

Come, better, saada.

Neme two importani precautions which must be taken, in order to obtun an secur vonult mi' £hsa experiment

State what will happen if too much sen i added · Give reasons for your answer

in 48 expErmeni With a constari volume a thermometer the following results were obtained

Scale Readings of mercury column when volume u kept constan

Experimental Condition

Boned Limb

Open Limb

Buff in melting ce

128 mm

104.im

fiteát 1 stan

Balbi ui liquid X

128 m

128 mm

Giren Atmosphere prese 760 mmHg, constant throughout the

the unknown temperature, 6 of liquid X. in "C

the fractional increase in pressure per "C" nie so semperature

Some are often in debt. They sanna modern, carmang squipments or hay:

bhe new pressure on the vessel, after (1) 1 atroke and (ii) 2 sarokos

SECTION."

-LIGHT AND SOU

Fethada-by which, food"roduction: 1 be increased

Climatis difficulties can be overcome by irrigation.

To improve fields, chemical fertilizers can he used to giys fertility to the roll and new, hybrid seed of rice and whest

be used.

Hodern farming methods and enuipants can be used to its

more efficienti Multiple crop ing pan de int

With these, the farming area can be extended.

greater food production.at

This meant

It is also necesmer to reform the Land tenure system au

that the size of the fields can be enlarged.

The education of the farmers and the young generation 1 Important because they have to accept these changes and to Tarry them out with the greatest etfioiency. Moderately or sparael; populated areas of Burm

BOYAZ

Moderately populated areas are found in most of the Sittang Basin, the Arakan cpest and the Tenanserin coast because there.

only limited lowland. It is hot and wet so thick forast Le found. Therefore agriculture le not very easy, The Upper Irrawaddy Valley the Northern Rille Region and the Shan Plateau are very sparsly populated because of the mountainous nature. 3011 cover is thin and infertile. D forest also limits the use of land for agrusilturo. These arÈLE are also too remote and cannot be reached easily,

calculate

constant what

South

Star With reference to the disgram, where in the honzontal plane would you expect to fiņa the neutrai

point if the horizontal component of the earth's field is taken into considération":

If the current in PQ is decreased slightly in which direction will the neutral point move,

The following diagram shows a thick copper conductor 48, connected to a loop of wire as-shown AB is placed symmetrically between the poles of two mugnets

Magnici

Magnet

Anacon cernel containing P. cm2 of we at a premie. Po mm of mercury it connected to v vichig pump, which at each sujoke bracuates can of zur if the temper

State the directions in which current (if any) will flow in the wire 48, in she following cases:

As is moved horizontally towards S

(U) - 48 is moved vertically downward

(i) AB is moved along its own length out of the field

AB is moved up and down continuously us the magnetic fiel

resistances are compared using i metre bridge.

Draw the circuit diagram

(i) If one of the gaps of the metre bridge is closed-by-6 3-ohm: resistance and the other by

5-ohm resistance, where is the polni of balance: 7:

A wire 67 resistivity 10 ohm cry and a cross-sectional area 164 x. 10′′ cm2. w then connected by Marillet withithe 5 plumiistance 10 the balancë point ursów at the nud-pomë, of the mere ruige, what is the lengur of the wire used i

(b). The

art of the Country

The Dry Zone of Burma is onlied the "Heart of the country. It is so called because of many reasons It is loontionally?

the centre of the country and the focus of routes.

As it is occupying the river valley and the natural vegetation le easy to clear for settlement, it is the old ultural contro. Several old capitale wore built there.

This ta the only area in Bursa which produsse petroleum, This is also the sole producer of cotton, disseds, groundnut

■nd aecium for export

This area surrounded by halie which are covered with monsoon forests. Lambering is practised and teak and tramwood are obtained for export.

With raw materials obtained locally, there is the development of industries such as cotton weaving, silk weaving, oil pressing and oil refining.

This uran, ie ane of the most dangely populated, areas in

The Site and Function e Rangoon

Rangoon te situated at the head of the estuary of River. Rangoon which the free from allting. It is connected to River