1976-03-31 — Page 24

49, Circle PQR touches

興四第張六第日一初月三年辰丙妻

WAH KIU YAT PO

報日橋.

三期星

日一卅月三年六七九一座公年五十六國民商中

育教傿单

A. 2AN

x.

10

* 44

64 X

E. This problem cannot be solved with

the given information.

D. 3.x 10

* * * *

E. 4

* 44 x

AN

C.

65° 70°

1976中學會考試題預習專欄

化學科(二十)

李國榮

CHEMISTRY (25)

1. Which of the following statements

describes a covalent bond?

A. It is a gain or loss of electrons,

B. It is an electrovalent bond.

C. It is a sharing of electrone which

may not be an equal sharing.

D. It is an attraction of the electrons

of one atom for the protons of an- other atom,

E. It is the combining of the electrons

of two different kinds of atoms found on extreme opposite sides of the Periodic Table.

2. A compound, whose molecular weight is 90, contains 40% carbon, 6.67% hydrogen and 53% oxygen. What is the molecular formula of the compound? (c=12, 0=16, H=1)

(AN - Avogadro'a 'Number)

3. When a small piece of phosphorus pentachloride is added to a little of an organie licuid L, misty fumes are formed, L may contain which of the following structures?

A, C=O BCC C. 0-H D; C-H E. C-0-C.

44 5.3gm of oxalic acid crystal

(H2C204+2H20) is dissolved in water and then transferred to a volumatic flask and added up to liter. The molarity of the solution is

A. Ob "M B. 1.OM C. 0.2M D. 0.25M E. 0.06M

15. At 3270 and 700mm mercury, 3.25 lite liters of oxygen contain the same nun- ber of moleculen as

A. 3.25 liters of water at the same

temperature and pressure..

B. 3.25 liters of hydrogen at the same

temperature and pressure.

C. 1.625 liters of carbon dioxide at

the same temperature and pressure. D. 6.5 liters of carbon dioxide at the

same temperature and pressure.

E 3.25 liters of molar sulfuric acid.

Answers to last week's questions.

1. C 2. B 3. C.

5. A 6. S.

7% P 8.

9. R

10. Q 12. A

B 14, C 15. D

7. The ratio of the surface areas of 2

· sphere is 1:4, what is the ratio of their volumes?

A. 1:2 B. 1:4 .0.1:8 D. 1:16 E. none of the above

8. If Q-4 -- which of the following

are true?

(1) As x becomes very large, Q appr

chea 3.

(2) When x is X, Q equale 0.

(3) When x is 0,2, square root Qia

imaginary.

A. (2) only B. (3) only

C. (1) and (2) only

D. (2) and (3) only

E. all of them

9. The graph of the equation x +4y? =="

is

A. circle. B. ellipsа

C. parabola

D. hyperbola E none of these

10. If m denotes the gradient of the

curve _y=f(x) at the point (x, f(x)), then 20 for every point in A. {(x, f(x)):2<x<4} only

B. {(x, f(x)):1<x<? or 4<x<5} only c. {(x, f(x)):3<xs5} only D. ((x, f(x)):^£x3} only E. {(x, f(x)):1 $x= only

1. If the straight lines whose equatio- ns are x+6y=12 and 4x+cy=12 are parall- el, then C equals

A. 6

12 C 24:

:48 E. 72

AXYZ.

Find the

angles of APOR A. 50°

B. 500 6indTM

6501

D. 550 550

o 559

60

50. PQRS 18 «//gram, and

points of PQ, PS

respectively.

Area of ARMN

Area of PQRS .

A. T

D.

Then

N are mid-

57. If the rati of the merimeters of

two similar triangles is 3:5, then the rátin of their areas is

A √3:5 D. 3:5

B3:5

E. 9:25

C. F:15

Cone

52. Cone A has a volume of 30cm.

Bis one-third as tall as Cone A, but with diameter twice that of Cone A. Volume of Cone B is.

...

A. 200m

D. 40cm3

༣

B. 22cm C. 33cm

45cm

53. G is the centroid

of AABG.

Area AGBC

Area AABC

1

A.

B

E.

3. What are the coefficients that balan-

ce this equation?

TO

B. 2,6,4

In the production of hydrogen from

Eino and hydrochloric acid, the react-

Lon rate will increase when.

A. the temperature is increased.

B. the exposed surface of zine is in-

greased.

C. the concentration of the scid is

E

eted in the gas.

collected by upward delî-

An element with an atomic number

is

assified

as a(n)

metal B. non-metal

amphoteric element. allotrope

Isoto

1976中學會考試題預習專欄

新數科 (二十)

MODERN MATHEMATICS- (20

Multiple Choice questions

文長波、

1. Which of the following is the cam-

pletely factored form af 5x4-20 in the.

real number synten?

A. 5(x-4).

C. (x2)(510)

D. 5(x-2)(x+ ?)(x +?).

E. (x-2)(x+. ?)(5x+10)

2. There are five equations

(1) 2x+6y=1

12. What is the volume of a cylinder, radius. 24cm., inscribed in a sphere radius 25cm.7

A. 576 cu.cm.

1. 4032 cu.co.

c. 8064π eu.cm. D 14400 cu.cm. E. 28800 Tcu.cm

13. The following graph have drawn for -8<x<%. Only one of them could re- present y=x”

Which one is it?

54. AB, CD are any two intersecting

straight lines, P is a variable point equidistant from the lines. The locus

Lines

of P is

A. A pair of straight lines to each

other

B. A pair of // lines

C. An arc of a cirole

D. A pair of straight lines making 45".

to each other

A pair of straight lines making 45

to both AB and CD

55. XT is a tangent.

to the cirale ATB.

IT XT-8cm., BX=4em., then AB

A. 16cm.

C.12cm.

44cm.

B.:

D. Rem

E. 2( √17-1)cm./

6. The

6. The firet member in the alkane series

which shows isomerien is

B. propane

D. pentane E, hexane

butane

7. A bupil is provided with "gm of a

sulfide of magnesium. It contains 3gu of magnesium. The formula of the com- pound may b a

A. MRS B

E

Mg5

When solid iodine is changed into

por, there is

change in mass of the atoms. change in density.

change in atomic atructure of the lementa.

no change in energy.

E. a change in the number of electrons

In each atom.

9. What is the catalyst needed for this

reaction:- 4NH.

502

A. Bunlight D. copper

* 4NO + 6H20

B. heat C. platinum

adid

E. concentratád sulfuric

10. Dalton's atomic theory was modified

because of

B.

&, the discovery of allotropy.

"the observation of sublimation in

some: elementa,

C. the discovery of atomic structure.

D. the discovery of isomeriam. E, the finding of new elements after

his death.

11. A silver spoon soon turns turnished

because of

A. carbon dioxide in the air.

B. sulfur dioxide in the air.

C. hydrogen sulfide in the air.

D. chlorine in the vater,

E. oxygen in the water.

12. In the reaction:CH+302

2002+280. The weight of CO, producéd from 102x3 molecules of 0, is

(3) 10x+30y=5

(5) 264-3

(2) 3x+9y==}

(4) + -

Which pair of them has unimue solution? A. (1) and (3) B. (*) and (4) C. (2) and (5) D. (7) and (5) E. (P) and

If

and

B.

25

none of the above

equal to

4, 25 men working 8 hours a day redake a

· road in 63 days, the time taken for 45 gen, working 7 hours a day is A, 8 days B. 10 days

D. 40 days E. 80 days

C. 20 days

5. The shaded portion ABCD is the dia-

gram represents an area of 60 so,unita. Which of the following equation will give the correct value of x? A. x2-7x-48=0

B. x2+7x-48=0.

C. x2-x-72-0

D. x2+X-72=0

E. none of the above

6. A man goes downstream in his motor-

boat for a distance of 3km and at once returns to his starting point. How long did it take him to make the entire trip?

(7) With the stream flowing at "km/hr., he traveled downstream at the rate: of 10km/hr.

(II) His average rate for the entire.

trip was 30km/hr.

A. This problem can be solved using

only the given information marked(F) B. This problem can be solved using

only the given information marked (II).

C. This problem can be solved using

either the given information marked (I) or II).

D. This problem can be solved only by using the given information markad (I) and (II).

If the angles of a pentagon, taken in order, are in the ratios 1:2:3:5: the size of the greatest angle is A. 1400 D. 2331

B. 19

C. 2100

E. 2809

15. If one root of the enuation

x+kx-8=0 is the square of the other, what is the value of k?

B. A. -6

Answer:

1. D 6. C

2. B

7. C

11. C 12. C

mom

C. 2 D.. 6

E 10.

E 14. 0 15.

1976中學會考試題預習專欄

數學科

(二十)葉柏芳

TRADITIONAL MATHEMATICS

(20)

46. ABC is a triangle-right-angled at A,

AD | BC. If BD=4, and DC-12, then AC=

8 B. 93 C.

A.

D. 12/3

E. 15

47. Find the sum of the

six parked angleg

4. 80 B. 270°

C. 360° .D. 540° E. 720°

49. O is the centre of

the circle.

value of x.

Find the

A. 110 B. 120 C. 130° D. 1400 E. 150°

56. In ABC, AB-2AC, and BC AC, then

AC AB+BQ+CA

lies between:

A

and 7

B.

and

D.

E.

76

and

+10+10

57. O is the centre of the circle, CED 45°

and minor aṛe AB=K of al the circumference.

Find the ratio of area.

of ACED to that of AOAB.

A. 2:1 B. 3:1 D. 2:1

58.

E. 3:1

Cre the centres of the two

which touch each other at E and touch the straight

line AB at A and B

respectively.

If

AC=16, BD=9, find AB.

A. 12 B. 6/2 D. 43 E. 35

59. A straight line AD cuts two concén- tric circles of radii 140m. and 150m. respectively, at A,B,C,D, taken in order. If AD÷10cm., find BC.

A. 2cm. B. 4cm. C. 6cm.

E. the case is impossible

D. 8cm..

60. AD is a median of AABC and ADB is Which of the following condit-

ions must be true?

acute.

A. AB=AC

D. ADAC

B. AB AC

C. ACAB

E. BD AC

Answers: 46. B

47. E 51. E 52. D

48. A 53. B

49. D 54. A

50.

C

55. C

56. B 57. D

58. A

59. E

60.

000