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其三站張六第
日五初月四年申戊室
KIU YAT PO
C. E.
3.英文中學會考試題預習專欄
物理科
(廿七)
陸永熾·
Physics (2737
11. (a) Thrust and Pressure
Thrust is defined as a push force while
pressure is the normal thrust acting on a unft.
area.
Thrust bears the unit of force:- dyne,
gm. -tzy poundal, lb,wt.. etc.
The units of pressure are:- gyne/sq.cm. got.wt../aq. cm.; pdl/sq. in.. ib.wt./sq, in..., etc.
(b) The pressure in a liquid is measured by:-
phdg (dynes/sq.cm.)
*=hd (gm.wt./sq.cm. }
(1) Pressure on the top face - 20 gm.wɩ./eq.co.
Pressure on the bottom face = 70 g.wt./eq.cm. (11) Thrust on the top. face = på
Thrust on the bottom
ז
- 20 x 20 gm.WT*,
- 400 go,wt.
* 70 x 20
1400 gm.wt.
(iii) The thrust on the bottom exceeds that on
the top of the object by (1400-400) g whe That is, the upthrust of water on the object
is 1000 gm.who
Avchinades "principle
When a body is wholly or partially immersed in
a fluid it experiences an upthrust equal to the weight of the fluid displaced,
The volume of water displaced 20 * 50 0.0..
* 1000 *.**
Weight of water displaced - 1000 gm.wb. This is exactly equals to the upthrust that is evaluated in (b).
Lys a be the mas of copper attached in gm.
Volume of copper.
JACE
of paraffin
8.9
20 10.9
20) gwt.
•
0.0.
Glycerin displaced
8.9 0.9
Total weight of copper and paraffin
Upthrust of glycerins
By law of Flotation
• 20 • 1.3 (
20 0.9
1.3 gm wt
6.9 x 0.9{m • • 20) = 1,3(0.9m • 8,9 x 20) 0.9 (8.9 – 1.3) 2.8.9 #20 (1.3 - 0.9)
178 x 0.4 0.9 x 7.6 10.41
The mes of copper attached is 10.41
The moment of a foros about a point is a turning effect caused by the foros and is measured by the product of the force, and the perpendicular distance of its line of action from the point.
“is removed by the following process:=)
With tap T opened, the reservoir is
raised until the burette is full of mercury. A cloi.chloride drying tube is attached to the tap and the reservoir lowered until the burette is about half full of dry air.
(2))lf the volum of air is altered, the
temperature will change. It is necessary ve wait a short while after each adjustment in order to give the air time to revert to room temperature, before readings are taken.
(c)
Radius of ustal disġ = 8 fr. -3 in..
Radius of removed dise - r in.
- 1 in.
Distance of C.G. of remainder portion from
Q = x in.
Taking momente at 4,
3
Moment of the weight of reminder
- moment of wt, of ding – musert of wt. of removed portion.
(782 -*-*)= = 782 x 3 −Xr z 1. 2: (32 – 1)x - 32 - 1
** 34
Ans. The 0,0, of the remainding portion is į in.
from the centre of the dies and on the other) side of it.
(d) Before inserting the tube into the cisterni
Pressure of air - atmospheric pressure
K on of Hg.
Volume of air - 30 cm. of air column efter inserting
Pressure of *** -
Volume of sir
By Boyle Law
SOH - 5504 35)
- 77
-
(90
*m. of
The pressure of the atmosphere at that time Is 77 an. of mercury,
3. (a) (1) Newtónfa second law of motion
The rate of ɑhange of momentum of a body is proportional to the applied force and take place in the direction in blah the faros acta,
The feroe DECOSTAN socaleration in a body produat of the man. ukoosimration
-(ii) Cosfriaient. of the limitẳng
(b) The wooden block is
on a horizontal boar
thread is tied toʻthe freely running culley at
the
Taced
over a
quit the boards,
Various horisontal forces can be applied to the block by placing weight in scoala pan attached to the thread,
HONGKON
(11) The centre of gravity of a body is defined as the point of application of the resultant foros due to the earth's attraction
(1) Boyle's Law
The volume of a fixed meas of gas is inversely proportional to the pres SURE,
ovided the temperature remains omstant,
#10 verify Boylefa. Law
A burette and a glass tube acting as 'sercury reservoir are connected by a stout,
xible rubber tubing. They are supported
cally by the side of a verticle scale and
žube can be moved upwards or
Scale
tir ba
mercury la poured in, trepping a mea or air in the burette.
reading is taken,: H, om. The volum air noted, and the difference
h on, of the two mercury The reservoir is then mowed
new readings are
number of positions, h) {am, and volume
genstant..
dá be dry. Water va
三期
日一月五年八六九一股公年七十五國民高中
1968 中學入學試試題預習專欄
各位同學:
英文科 (廿六)
王挺生。
本欄泡去餘大練的測融,包含了不少滿去中學入學試英文科的各類型離自,同時三介紹了相當 數量的新類型題目,希望大樂郪魽油滤速测籤方式,起和繫響這種種類型的然麵,以增加陷 裝試的經驗,以達到本攔的目的。
道夫是本欄限接一期,大學在本星期五(五月三日)就室臨憒正考驗,希望大家都能鐵定圖
· H · RUUNARSKRS ·
FINAL TESE
Frommeiation
1. If the word ends ins 'S' sound, wirte 3.
Examples DRESS $
If the word ends in a'2' sound, write 2.
Example: DOGS Z
If the worð ånds în an *IZ' sound, write IG..
Example: FOXES LIZ
If the word ends in a "T" sound, write T. Example: FACEDTM** T
If the word erda în a 'D' sound, write D. Examples DIED D.
If the word ande în an 'ID' sound, write ID. Example: COUNTED ID
helped clothed
(e) famous (g) expeated (1) danceð
NOBA
{{(a) asked ((o).legs (g) mendea (s) advice:
tried
(a) pushed
(f) teaches
(h) tape
(3) ice (1) wished
(n) doors (P) wicked
(r) days
filled
6. Each of the following words has one or more
than one silent letters.
in the blanka *. Examplona ANSWET
wrong
Write them out
weigh
(a) plumber
1ror
(c) knife
high
(e) often
(r) write
(g) wrtat
(b) heir
(i) khem
(J), dumb
b. If the pair of words rayme, put ẹ into the
blank.
KONG PUBLICLIB
Weights are added to the pan until the,
block is just on the point of slipping. When this takes place, the force of friction F go, wt. has reached its maximum or limiting value and is equal to the total weight (R) of the par plus the added weights,
The experiment is repeated for several times with weights added on the block, thus varying the normá' reaction
The ratio of F to R is erlusted and is found to be approximately constant. F/. The coefficient of statio friction is
determined.
(a) Coaf, af statio friction.
Cosf. of dynamia friction -
105 0.7 1500
0.8 x 0.7 0.56
Friction = 0.56 x 150 gm.wt.
- 0:56 x 150 x 980 synes
0.56 x 150 x 980 150
retardation,
cm./s002
- - 0.56 x 980 ́am./sec,2 Initial velocity - 300 cm./s00. "Distance slided
2
300 x 300
2 x 0.56 x 980
• 82-
The block slides for 82 0.
Revision Exar-ise
Section B
4. (a) Explain the statement "the coefficient of resi
m of murcury in 0,00018/dog.C."
(h) Describe an experiment to determine the latent
If the pair of words do not rhyme, pur
into the blank..
Exampleaz cheese, please
fore. from
(a) kill, wheel Tor. ball
Word," work
(g) Church. Inoh
Take, Joke
(b) alone, BOWD
(a) door; MOOT
(f) heal, feel
boil, oil (4) chalk, walk,
If there is one word in each of the following akieb dosa dot rhyme with the other three word write it in the space. If 414 forske
#Ti 18. X. Examples fear,
freeze,
we're,"
DEBT. bear
he'8, -fees,
cries, size, wise, rice:
1) vara, aro, faro,
cala
climb, time, Limb, lime
eve, believe, receive, leave)
date, eight, beight, wait
Answers to TEST 25.
(a) came, (b),X, (c) search, (8) %, (e) win. (8)] won, (g) X, (h) vast..
took, are made, have, must be, have not asan, an working, are you going. told, is, shall visit. (a) Thon. (b) those, (c) Which, (d) How, (e) Who 4. moment, beneath, walls, heard, towards, game,
threw, centre, pieces, burning.
6.
(a) William (b) Mongkok. (c) cousin, (d) once, (e) Shatin, (f) 10, (g) 3. (h) 5. (1) Lan Tàu. (a) for, (b) by, (c) with, (0) by, (e) for.
7. (8) Fish swip in the SEB,-
(b) I can see myself in the mirror.y
What can I do for you?.
(a) He borrowed a book from the library,
(e) Please wait for me.
8. (a) 18, (b) was, (c) 18, (d) was,
9. (a) cruelty. (b) dead, (e) daily; (8) sealed,
(e) friendship.
10. (a) You may not open the door. (b) You ought not
to write it down. (c) John could not ride a horse when he was seven. (e) to shall not go to mim to. GOTTO".
Answers to FINAL TEST
1. (a) T, (b) 0, (c) T, (4) IZ, (e) 8, (f) 12, (g)
ID, (h) s, (1) #, (j) 9, (k) 2, (1) T, (□) T, (n) z. (a) z. (p) ID. (q) ID. (x) Z, (•) (t) D.
་
2. (e) b,<(b) ̧r, (o) k, (d) gh, (e) t, (f) 4, (g)
*. (h) b, (1) k. (3) b.
3.
(0) (b) • (0) = (d)
-
(f) + (g) (b) +
(1)
a. (a) rice, (b) warm, (o) limb, (d) X, (e) height.
́heat of fusion of ice and explain how the result is obtained from the observations, (a) 150 gm of water are introduced into a
calorimeter of mes 23 gm, and the temperature is observed to be 25°C. Dry ice is then carefully dropped into the water until the - temperature has fallen-to 15°G. The tota) mes of the onlorimeter and contents is found finally to be 219.3 gms what is the water aquimlet of the calorinster?
(latent best of fusion of ios = 80 cal. per
|5. (a) Distinguish briefly between honduction and
acere a tion,
(b) Define relative humidity.
(s)'How you would measure the relative humidity in
a rods.
(4) x pieds of metal weighs 40 gì. in air; 35.2 p.
when, immersed in a liquid et 5°C. and 35;25 j 35°C. Find the coefficiens of expansion of the linear expansion of metal is 0.0002 par