真三弟張四第
日八初月二年乙買
WAH KIYAT PO
三期星
(+)
華僑教育
【 1965年度
「車中学入学試
試題預習車欄
物理科 (十四)
̇陸永熾
日十月三年五六九一公年四十五中
Output of the electric drill ® & hip.
- x 746 watt.
If all the heat generated is absorbed by the iron of mass 100 gm, and if the rise of temperature of it is defecam In 20 sec
Energy given out as heat
Heat absorbed by the fron
Bince,
Heat absorbed by the fron
100 x 0.11 x 9
20 x x 746′ x 1/4.2_061.
xx 746
* Saat x spunty x teng,-12 sé
100 0.11 x cal.
energy given out
-20 x ± x 746 x 1/ht
29.x 716
11 x 4 x 4.2
英文科
(十四
̇姚述聖
17 Selation
TEST 14
($ine: allowed » 25 minutes.
va one word for each of the following s
(a) An instrument for taking photographe
(b) a thing used to open a lock
(0) A deep hole dug in the ground to get water
(d) 1 book from which we can find the meaning of
words
le) The first season' of a rear:
Tin saoh line, ons word is different: from the others, Afrits 15 our 10,
the blank provided is.
(a) college, cottage, temple, cinema, mansion," ros? (b) whole, gil, tall, total, entire, perfect, complete(b) (c) office, clinic, pilot, restaurant, library, shop (c). (a) duck, pig, pigeon, hen, goose, cook
(a)
(a). (e)
.the, gisen nurani
(a) WIDTH
She is a kind woman.
Can you tell me how
the room 10,
(6) COMFORT
to sit on a sofái
We should be kind to the
people.
(e) east, south, west, north, 'point. south-east
13. Fill an so# Dianka wito the correct sajectives
Example
KINDRESS
(0) POVERTYI {a} FREEDOM a11 human beings, like to be (*) CARE
When we are driving, we should be
Pill in the blanks with verbs in the correct tense
(a) STRIKES
Listen, the clook
(b) RUNA
Last week you
in the recei
(c) DOS
The careless boy nevar
his work we)17:
(a) SING!
Young boys usually
very sweetly,
(+) SPEAKI
to your teacher.
To-morrow he
3. Put one of the following words to sace blank i
nor, or, either, and, but, who, whose, chợ
weather, whether.
[{a}-It conta
́s dollar
one sollas ten pente)
(b) 1 anked him
he wanted a sweet.
(=) That is the man
knows my father,)
(d) I wanted to go for a pienso, ::(0)
- my father was too busy ONG BEA RES Vorking, the other was restizke
Underline the word which has a similar meaning to the word in capitala: ̈{2). WEALTHYS.
(6) BRIGHT
(6) BROTHERLY
(4) BROAD
((*) JOYFUL
pads.
rtob, unhappy, good, much,
dark, white, plain, light, clever.
Lovely, beautifully, kingly, friendly, fair2) lone, 100, will, it, thín playfu
cheerful, sad, laugh,, talkativep
Put a mark / to show where the adverb "in. brackets. (s) You are working for the examination, (hard) (b) She was pleased.
(much).
(a) They reaated the top of the hill. (hardly)
(4) She spent all her school fou, - {avan)"
(*) You will sucosed if you don't WOTH
hardh{tever)
10. Punctuste the reltowing sentences, ▼ Pas in full stops, commas, questi
marks or exclamation marks and capital lettera where noceasars (a) thursday is the fifth day of the week i
((b) has jane over tell lian
falar shan come scross jane yesterday
{(a) “who are you” naked the old man
e) they told me the whole story about are léo,
EP113 in each of the COLLowing blanks with a suitable mora
(a) I divided the cake
(b) I was born
four parts.
1954.
(a) then it rains, I cannot go
(4) The monkey nade friends
(•) Hobody can prevent me
the shark. going.
PRISICS
Hr. Lak Wing Ches
(4) Avmoration is distinguished from boiling in the following ways:- *) Evaporation, to a greater or lesser extent, takes place at any,
temperature, boiling occurs only at the boiling point, 11) Evaporation takes place only at the surface of the liqui,
boiling takes place throughout the entire liquid 111) Evaporation is a slow process, while boiling is a quick process.)
The absolute mwuidity or the air is defined as the mass or water. vapour present per unit volume and it bears units. The relative bytidity of the air is the ratio of the mass of water vapour in given volume of air to the mass of water vapour required to saturate the same volume of air at the air temerature.
dr at the air temper
It bears no unit;
A saturated vapour 19 one which is in a state of equilíbruin with| its owi llauid, that is the rate at which molecules leave the - 1iquid is equal to the rate at which others, return to it. An unsaturatas vapour is one at which the rate at which molecules 、 leave the liquid exceeds that of returning, that is, before the -state of equilibrium la reached.
[h) The dew point is defined as the temperature at which, the water } vapour present in the air is just sufficient to saturate it.
The dew point of the air in a room may be round with, an ins trument called a dew-point hygrometer. A simple form of s Regnault's dew-point hygrometer is as shown below. Two glas tubes have highly polished silvered thimbles attached to their lende, B and C respectively. The tubes are connected together,/
oir Temp
to ast
point Hygrometer.
"Ty and T2 are thermometers inside each tube, and while I2ɔ pereured
the temperature or the air, Ty measures the temperature of a quantity of other which fills the thimble B.
med By xeans of an aspirator, D, bubbles of air are drawn at a
steady rate through a tube & dipping in the ether. As sir bubble through the ather, the rate of evaporation is increased, and don➡ sequently cooling takes place. When the air in the neighbourhood/ of the thimble is cooled to a temperature at which the vapour present in garricton to saturate it, day will begin to be deposited' on the bright silver surface, Immediately the surface shows the first sign of duliness, the sir bubbles are stopped and the other temperature noted. The hygrometer is then allowed to vara up and the temperature of disappearance of the daw is recorded. point is taken as the mean of kipas tuo tamomdatuju.
・TOT
farm are
reting
NOME TR
The dew,
During the day, the land has a lower specific heat than the water, it is heated by the sun to a,high temperature, Air over the land is therefore heated, expands and tipeg while cooler air blows in from the sea to take its place, Thio reults in the formation of a sea breeze, anņair circulation with wind blowing
·landward from the ses and in opposite direction in the upper
in the atmosphere,
At night time the land is no longer heated by the sun and tools very rapidly. On the other hand, the sea shows practically No change in temperature, since it has been heated to greater prot depth and consemiently acts as a reservoir of heat, The air blowa seaward near the earth. That is, the air convection current is reversed, and Su called the land breeze.
(d) Heat in a form of energy, and may be converted to mechanical energy or conversely mechanical energy into beat. The statement in the question beans that one clorie of heat is the equivalent of 4,2. Joules of work, If ons salorie of het is used to do work, 4,2 Joules of work in obtained provided that there is no loss.
50.7
deg. C. (3 sign, fiz.)
Ans. The rise in temperature of the iron ta 10.7 Deg.C
Questions: 15
1. (a) Draw appropriate diagrams to showt
1) how an aclipse of the sun occurs, distinguishing clearly between
total and partial eclipses:
11) why three images are formed when an upright pin is placed
between the reflecting surfaces of two vertical plane mirrors meeting at right angles,
(b) A mass stands in a room 20 ft. square by 10 rt. high. Un ong wall
there is a mirror 4 ft. high with its lower edge 3 ft. from the floor. Where must the man's eye be placed so that he may see the whole of the opposite wall reflected in the mirror.
(e) Show that when a ray of light is reflected from a plance vertical
mirror and the mirror is turned round a vertical axis through an angle, the reflected ray is turned through 20,
(a) State the laws of reflection.
(b) Exp2 how you would determine by an optical mthod the radius
of curvature of a concave mirrort 1) approximately and quickly;
111 more accurately.
(e) In an experiment with a concave mirror the following readings of
Draw a graph of object and real image distances were obtained.
with 1/v as the vertical axis and 1/u as the horizontal.
From the graph obtain the focal length of the mimo.
u ez. 26.7 17.7 20.0 25.7 50.5 13.3
Y ON.
16,0
23.0 20.0 25.0 12.5 40.0
(d) A concave mirror has a radius of curvature of 10 cm. Find the tw positions where an obejct may be placed so that the image in each case is 4 times the size of the object.
(e) 1)
At nights when the sky is clear, heat radiated from the earth disappears into space and the ground surface cools rapidly. If the temperature falls below the dew poing air in contact with the ground will also be cooled and dew deposited. On a cloudy night, the clouds radiate back nearly all the the heat energy the earth itself radiates, Cooling of the ground surface is thereby retarded and dew is not so likely cof fore.
On glass neavy day is more likely to be formed sines-plants give off water vapour which increases the local humidity there): than other places,
PART
$11) On a windy night; the moisture ladden gir la Diawn away |
before its temperature reaches the dew-point. Therefore, de is not likely to form as in a calm night,
7. Solution E
(a) Conduction or heat is the process by which the heat passes from che
heated part of a mibstance to another. It is a transfer of heat, by means ofe÷the collisions of molecules in which "the" kvarage position of the molecules remains unchanged.
go them that mercury is a better conductor than water.
Wan melts
releases.
cork
The test-tubes containing mercury and water respectively are attached at the bottom with melted wax to a cork. A piece of thick copper, wire bent twice at right angles is then placed with
■ Mig, in each of the two Liquids, On heating the centre of the :/. wine, with a bunsen flame, heat is conducted through the metal aqually into the water and mercury. ·In a very short time the sha on the mercury-filled" tube melts and the cork falls off. Very prolonged hesting" is necessary before the same ocours with the unter-filled tube.
(b) The transfer or heat from one place (heated) to another by sứ
movement of the substance itself between these places is called convection, Convection cannot take place in solids because the particles cannot move freely, and 16 occurs in gases with more sape than in liquida,
The circulation of fluid to and from the heated portion” la called convection current. The following apparatus is used to demonstrate convection current.
QwaserTM
horner
Q. Read, this cerurally
William the Conqueror was King of England, fe had three Cons. They were azlled Robert, William and Henry. Robert, the first mor, was tall, handsome and strong. William; the second son, had a red face. ▼ Eenry, the third son, was learned, quiet and kind-hearted. One day the King called his three sons to see trim one by one,↑ First] be asked Robert, "TF it had pleased God to make you a bird tratead of a boy, what kind of bird would you choose to be?” Robert answered, {"Bir, I would like to be a park because it is bold and brave." Then
the king onlied in William and asked him the same question.
William
*T would like to be an angle because 11 is the king of the birds and feared by all.” Then ba zeķed Henry, the young san replied,, "Sir, I would like to be a sterling because it is kind and friendly and sise,"
Underline the right answerL})
(a) Robert LF
(1) young and wrak?
(5) good-looking and healthy).
(b) Robert, William and Henry Very
(1) birde
{3) princes
le) Benry was VOTEE OF
(1) playing and fighting,
(5) little birda
(4) William, the second
¡y feared by his people (-31 Loved by his people
{{e) Little birds are afraid
(1) starling
(3) tigera
(C) A hawk im
(1) beautiful
(3): kind
(2))wise and #38:13
(as bold and brava
(2) princes
(4) englen!
(2) fearless, (4) timid.
11. Change the following sentences into quorvaamm 4,
(a) They would tell him the truth.
(b) The children were riding ponies.Í
fo) The aoldier fought bravely.
(2) diligent and’wine]
"(4) Ta kneel down in the churob.
(4) brave_and_|oruel;
`stúdente»
(e) We bring all our books to school,
Give the PLURAL of each of the following words », (a): tomato
((2) reading and thinking (4) his father's_throne,
(0) BIDY.
[rished to be y***
(4) drept, Su
(b) loar
(4) class
Answers to feaa13)
15(a) rly, (b) envelope, (a) asa, (d) piano,^{")"spring"
2. (a) belongs, (b) underline, (c) stole, (d) replied, (●)watching), 3. (a) apole, (b) March, (c) lion, (d) ferry, (*) canel.
4. (a) pass, (b) breath, (c) rises, (d) collar, (e) fásta
5. (a) because, (b) though, (c) if, (d) until, (e) and
6. (a) We1go to school because se want to learn.
(b) The lion which ran after him is walking round the tree.
(e) afterthe war was over the unemployed soldiers wandered all,
over the country,
dy Before we diva wa must make sure there are no rocks or PRODLE,
in the water.
They got home very late and they were tired at night,
7. (a) A nest was built in the tree by the bird,
(b) The story has been heard by most people. (o) The letters will be delivered by the postmany. [d) who was punished by you?
[e) That bridge was built by somebody in 19717
8, (a) was waiting, (b) forgot, (e), have just_suffered";{a} "wenth
eat.
9. (a) She has not been working hara y
(b) Jana did not change her shoes twice
(e) The ont did not fight with she dog.
d) The sea was not cair,"
*) He was not looking for his money;
lul (a) 2, lovely and unrelosa, (b) 2. pretty wings, (e) 3, on the le0KVA
(d) osterpillars, (e) 5. legs, fri 3. th coỡoons, (g) 2. in March,
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