1971-03-11 — Page 19

報日僑華

五第

BI+A=#*#32 WAH KIU YAT PO

1974 英文中學會考試題預習專欄:

四期星

日一十月三年一七九一写公年十六國民着中

MXAMINARE | SUNLIGHT PRESS

物理科

LESSON TWENTY

REVISION: TEST:

PHYSICS

MULTIPLE CHOICE SECTION

(1) A piece of glass (S.C. 6 2) is suspended by

thread with spring balance and placed in water

and then in a liquid of 5.0. 0.8 as shown:

(+)

10-3-1971

1971 英文中學會考試題預習專欄

WWE SUNLIGHT PRESS

化學科

CHEMISTRY

夏僑

(二十)

ルー

中文中學會考試題預習專欄

LESSON TWENTY

J-3-1971

ANSWERS TO EXERCISE 18:

數骨科(十) 張正部

(181) B

(182) p (183)

E

(184) E

(185) E

= 1+ 4 Sm — Sing

(186)

(187) S (188)

P

(189) T

(190) F

第十九次預習題解答

(191)

CHLORINE

BROMINE

TODINE

(1) △ABC之外援园半棒為R,

(A). Appearanc

Greenish-

Dark-red

Black crystal-

yellow gas

volatile

line solid;

ㄚ為内切因之半径,試証:

pungent smell

liquid; pungent

forms violet

r = 4RSin Sin

vapour

(证明)

smell,

(S—R) (S−b)(S~ <)

45(5-0)(5-1) (S−c)

sabc

poisonous

599.

HO

(Fig. d and e represents that only half the volume

of the solid is immersed.).

Consider the following statements:

1.The reading of balance in c is greatest.

2. The reading of balance in d is smaller than that

in each

3. The reading of balance

in b.

(B) Boiling

point (C) Melting-

point (D) Specific

gravity (E) Water

a is the same as that

(F) Bleaching

4. The reading of balance in a is greater than tha

in d.

When the glass is lowered further down in c. point is reached at which the reading of the balan becomes zero. (without touching the bottom of the breaker.}...

Which of the following alternatives is true?

A.. 2 and 4 only

B. 1, 3 and 4 only

C. 1, 3 and 5 onlv.

D. 1, and 2 only

2, 3 and 5 only

(2) Which of the following relations have the same meaning

Mass of a body

action

oxidizing agents% Metals and non-metals (1) Duute dil-ali

(J) Concentrated

alkalis

(K) Displacement

reactions

sonous

Slightly soluble;

114 sublime) 4.9

Slightly. soluble;

Almost insol- uble

forno acids, forns acids, HC1 and HC10; HB and

(de composes HBrO

water in sun

light)

Strong

Weak and

slow.

Strong

Fairly

strong

Reacts

Reacts.

Vigorously moderately Forms chlore Fords bro ides and mides. and hypochlorites hypo-

bromites

Forms chlorides Forms and chlorates bromides

and bronates Displaces bro- Displaces: mine and fodine fodine from bromides from and iodides jodides

Reacts least. vigorously.

Forms odides and hypoiodité.

S

Forms iodides and fouates

a = BD+ DC

(4) cz!! Ya + Yb + &c=Y= 4R

BD or cat of DC=Y GZ = BE) Ya+ Yb + Yc

a=rest - +rcot =

=(mt)

•2RSLA 2R 25

Sm

झ्ने नै हुन्छ ? हुन्छ उँ

+ +इन्ट

= a[stat sty+stc-#]"

=(A[ 25=sa-sb-sc + Q6

<<< [0+ab] =

4R

ab] abc

(5) #1BB (Ya-YJLF-1)(1-T)

ARYA

(EF) (Ta−1)(16-Y) (YE — Y) =(-a-π---

डाउन डेडिट है)

S syst

Volume of A

Density of à ̈

(in C.C.

Density of water

Weight of A Height of A in water

Density

Density of water

of the bod

in.

system,

Mass

Lass of equal volume of wat

A. 4 and 5 only

B. 1, 2 and 3 only

C. 2, 3 and 5 only

and

3 and

onl only

(3) A body or weight w suspended by a string is pulled

by a horizontal force F. (using a spring balance) shown. The tension of the string can be found by several methods: (Y and A are given)

1. Using triangle of forces with W, Fang

Tas sides of the triangle:

2. By taking moments at P

3. By finding the resultant of F and W, the

opposite force is T

By resolving F and W into 2 components on parallel to T, the other perpendicular. The.

vector sum of resultant components is the tension. By taking

at r

A, 1, 2, 3 and 4 onl

B. 1, 4 and 5 only

C. 2, 3 and 5 only

3, 4 and 5 only

E. All of them

EXERCISE 19

(192) There are three main kinds of steels:

(A) mild, Hard and Alloy steels. (B) Soft, Hard and Mild steels. (C) Cobalt, Mild and Alloy steels, (D) Cobalt, Hard and Alloy Steels. (E) Cobalt, Mild and Hard Steels. (193) Hard steels, containing about

0,1% - 0.2% of carbon (B) 0.2% 0.3% of carbon (C) 0.3% - 0.4% of cerbon (D) 0.5% 1.5% of carbon

2% -2.5% of carbon

(194) When Iron rusts in damp air, it forms hydrated.

ferric oxide or rust whose formula is

(A)

302

H2O

(B)

4Fe +30 + 280

Fe

(D) 4Fe + 302 + 5110.

(C) 4Fe 302 320

{E) 4Fe + 302 + xH_0

(195) Steam will react with heated metal, forming.

(Fe 0) 1.c.,

(A) triferric oxide

(B)

triferric tetroxide

(C) hydrated ferric oxide.

(D) ferric oxide

(E) ferrous oxide.

(196) Complete the following table:

PROPERTIES OF PHOSPHOROUS

RED

WHITE YELLOW

+Y=4RSW?

•(2) 32 Yo Yo Yo & DABC ZI 傍切图半佳 工為傍心脏明

Ya = stan^==

ERA)

SABC= AABIL+AACI1-

±ra(c+b-a)

-a-2a)

+

Ya (s-a)

abe sake

abc

(6) #2 YQ=Y=YL + Y¢ W=A

· 818=6V

同理=

AADI +

Ya=AD Ian

BUSZA 40 ÁÐTM AE

ADTAE ZAD ~AD - AB+BD

AE

=AB+BF

ACCE =AC +CF

2AD=AB+BETART CF

= ABT BC TAC

ZAPRS

stan

B = 1b = stan

<= rc = stan =

5(5-6) (5-6) (5-4)

s(b+c-a)-60

=(a+b+c)(b+c

△ABC為-三角形

第二十次預習題

BER] Sim₤=

Cos/24-tan-

(2) BEBA b GS = C+CGs B.

()}=hmbeikš 8, 12, 16

試求其名角之正弦,

(4)自某山麓之一點A與傳釘機.5 點之仰角南60°,再消點界地 早綫成30°角之斜坡上行-哩 達至點,測得∠BCA

求山之高度,

135

() {S}} |+ Tan2x lanX=See)

(6) A, B, C = 43IME.

(3) BEHA =+ |= Co Pt Cof+ Coc * Colt Shop Sing

CRC-GDA

(4) Which of the following can be expressed

the same

M. Work

2. Pover

3. Energy-

4. Quantity of heat.

Quantity of electricity

A. 1, 2 and 3 only

B. 1, 3 and 4 only.

C. 1, 4 and 5 only

3. only

and 5 only

A metre-rule is found to balance at the 49 cm mark When a weight of 50 gm is suspended at the 10 cm. mark, the balance point is found to be at 36 cm. mark. The weight of the metre scale is.

A. 25 gm

B. 50 gm

.C., 75 gm

D. 100 gr

(6) The velocity ratio of

1. an inclined plane is equal to sin A when A

the angle of inclination to the horizontal.

2.a wheel and axle is equal to the ratio of diameter

of wheel to diameter of axle,

a pulley system is equal to the number of pulleys.

a screw jack is equal to the pitch.

all machines increase with M.A%

Which of the above statements are true?

P. 1, 2, 3 and 5 onl

S. 2, 4 and 5 oni. T. All of them.

(a) Appearance

(c) Melting Point

(b) Stability

(d) Boiling Point

(e) Specific Gravity

(f) Solubility a

(g) Reaction with

NaOH Solution

(197) Write

out the formula for the following compound

of phosphorus

(a) phosphorus trioxide

(b) phosphorus pentoxide.

(c) metaphosphoric acid

(d) orthophosphoric acid

(e) phosphorous žeid

(f) Sodium dihydrogen phosphate

(g) Disodium hydrogen phosphate (h) Trisodium phosphate

having no change in momentum. Momentum.

conser

P203

the distance covered in each second is in arithmetic progression. ..

the power consumed is uniform.

Which of the following alternatives is true?

Q.1, 4 only

P. 1, 3 and 5 only

2, 3 and 4 only

T. All of them

B. 1, 4 and 5 only

Q. 1, 2 and 5 only

R. 2 and 3 only

(7) A body moves with a uniform acceleration of 2ft/sec2

implies

a suitable force (constant value) is acting on the body is moving with a velocity of 2ft/sec,

B) A force of 60 gm is just sufficient to push a block

of wood 100 gm up an inclined plane with

horizontal, The coefficient of.

10

(9) A bubble of air of volume 1/4c.c. at atmospheric

pressure, rises into the vacuum at the top a mercury barometer. The reading of the barometer drops from 75 cm.

0 cm. The volume of the air how occupies

P.

3.75

0.0.

Q. 1.25 c.c.

R. 5 c.c.

S.

15

to the

ANSWERS TO REVISION TEST. 1

JOANAL PART WILL BE GIVEN. NEXT TIME