1970-12-16 — Page 28

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1971 英文中學會考試題預習專欄

VA SUNLIGHT PRESS.

化學科

CHEMISTRY

LESSON ELIT

ANSWERS TO EXERCISE 6

(八)

16-12-70.

2

(47) s

(48) P (49) S (50) T

(51) D (52) B

(54) C (55) D (56) Q (57) R (58) Q (59) T (501

(61) To

EXERCISE.7

determine the vapour density of oxygen. Ther steps are taken.

(a) Calculate the vapour density of oxygen (b) Convert the volume of: sxygen to N.T.P.

(c) Calculate the weight of 1 litre of oxygen

N.T.P.

The correct order 181

A. (a), (b),

B. (c), (b), (a)

C. (b), (c), (a)

D. (8) 8) 8)

(62) Diffanion of a gas u. liquid or solute is the spread-

ing movement of the substance due to the notion of 4. molecules

atoms ions

D. molecules of its oin

內中

1971 英文中學會考試題預習專欄

新光出版社主編 SUNLIGHT PRESS

物理科

(八)

國光

成,梭行佩榮陳允

A. All of them

D. 2,3 and 4

only

3. 1,4 and 5 only E. 1,3 and 5 only C. 1,2,3 only

(23) Laternal inversion is correctea in the following

optical systems.

1. periscope

2. binocular.

3. plane martor 4. priso

Which of the following alternatives ss true?

PHYSICS

LESSON EIGHT

16-12-1970

ANSWERS TO EXERCISE 6

(24) Which

(2) A

(3)

(5) B

E. its own molecules or inns

(6) T

(7) R

(8)

(11) B

(12) E

(13) D

EXERCISE

(63) Graham's Law states that the rate diffusion of a res

is the rate

directly

portiona. TO ITS density

directly

ortional to the aquare root of ita

denaj ty

C. directly proportional to the cube root

density

inversely proportional to its density

E. inversely proportional to the square root of its

density,

(64) Which of the folloring is correct?

A mar diffuses faster than hydrogen.

B. carbon dioxide diffuses faster than air

C, air diffuses faster than hydrogen and carbon dioxide

D. hydrogen diffuses faster than air and carbon dioxide

E. carbon dioxide diffuses faster than hydrogen and-air

(65) If gas X is p2 tises denser than gas 7, then

A. gas Y diffuses P times faster than gas X B. gan Y diffuses P times faster then gas X C. gas Y diffuses †P times faster than gas X

D. gas X diffuses p2 times faster than gas Y E. gas X diffuses P. tixes faster than gas Y, (66) If Oxygen diffuses 1.22 tixes faster than ozone,

then the solecular weight of ozone is P. 24

30 R. 36 S. 40

40 T. 48

(67) If a given volume of gas C diffuses through a porous plug in G seconds. The same volume of gas D diffuses trhough the same plug in I seconds, the density of gas D. La P. G/B

Q.G/H2 R.. H/G

none of the above.

(68) An electrolyte is Compound, when in solution

metbed

P: conducts an electric current and 16

by it,

ecompo

conducts an electric current anu as not deco by it.

R. conducts an electric current,

does not conduct any electric current, does not conduct any electric decomposed by it.

(69) Electrolysis is

the decomposition of an electrolyte,

and is not.

the decomposition of an electrolyte by passing an electric current through it..

R. the decomposition of an eleizent.

S, the decomposition of an element by passing an

electric current; through tv.

the composition of an element þy passing an electric current through it.

(70) The electrodes are two pieces of metal (or graphite)

by which the electric current.

P. enters an electrolyte only.

leaves an electrolyte only."

enters and leaves an electrolyte. passing them.

passing through the electroly

(71) The cathode is the negative electrodueby which

A. electrons leave the electrolyte]

8. electrons enter the electrolyte.

C. electrons leave and enter the electrolyte,

an electric current passing through..

an electric current entera.

{72) A strong electrolyte is a compound which is

completely ionized in dilute solution only.

8. completely ionized in the molten state only.

completely ionized in concentrated solution only.

D. completely ionized in dilute solution and in the molten state.

E. only slightly ionized in dilute solution and

the molten state.

(73) Faraday's Laws of Electrolysis: (I) First Laxı

The weight of a substance liberated during electro- lysis is

A directly proportional to the

B. directly proportional to the square of the

C. directly proportional to the cube of the

D. inversely proportional to the

E. inversely proportional to the square of the

quantity of electricity passed,

(74) Second Lawr

The weights of substances liberated by the gan

quantity of electricity are

#. directly proportional to their chemical equivalente

inversely proportional to their chemical equivalents

8

directly proportional to their molecular weights. inversely proportional to their molecular weighte

E taversely proportional to their atomic weight

(14) If the critical angle of the material of prism

is 40 , angle x is

A 40°

9209

24:609

0* exhal to E30

15) Referring to the gayen diagram, object and image coincide. The radius of curvature of the lens is

A. equal to OA

B. equal to half the length of DA

C. equal to twice OA

D. equal to AB

E: not possible to be calculared sinca

the data given are not sufficient

16) A convex lens.

has the edge thicker than the centre

2. can be used as a simple man fvino

3. has two principal foci :-

plass

4. forms an image of same size as the obiect when

placed at C

5. has a focal length equivalent to half the radius

of cuvatúre

Which of the following

P. All of thes

Q. 2,3,4 and 5 only

R. 2,3 and 4 only

3 and

alternatives, is true?

S. 2,4 and 5 only

T 1.3 and 5 only

17) The optical centre of a convex lens is a point

Pat the centre of the lens

0. in the lens at which all parallel rays to

principal axis will converge after passing through the lens

R, on the principal axis through which all rays

are not deviated by the lens pass

in the lens at which all parallel rays to the principal axis appear to diverge after passing through the lens

at the centre of curvature of the tas

(18) Which of the following statements are true?

1. A is the real object

2. B is the virtual image

3. AB is the focal length of the Lena

4. B is the virtual object.

5. A is the virtual object

P. 1 and 2 only

2. 3 and 4 only'

R. 2 and 5 only

(19) When an object is placed between 21 and

image formed by a convex lens is

1. on the other side of the lens

2. real

3. erect

4. enlarged

55. diminished

Which of the following alternatives is truc

P12 and 4 only

Q1,3 and 5 only.

R. 2,3 and 4 only

S. 3 and 5 only

T. 1,2 and 5 only.

(20) Referring to Question 19, if the lens is replaced

by a concave lens, which alternative is true?.

P. 1,2 and 4 only,

Q. 1,3 and 5 only

R. 2,3 and 4 only

(21) An inverted in

from

S. 3 and 5 only

T 1,2 and 5 only

image 8 cm high is formed IU cm aux a convex lens. If the object is 3 cm high. thefocal length, of the lens is

C1:5 cm

3.5cm

Е. бел

Which of the following terus are connected with

concave arrors?

I. radius of curvature

2. optical centre

3. real image

4. virtual focus

5. pole

Which alternatives are true:

only

A. All of them: BB. 1 and 2 only

C. 3 and 5 only E. 1,2.3 and D. 3, 4 and 5 only

of the following statements are correct? The cause of long sight is partly due to the focal length of the eye-lens being too long. The cause of long sight as partly due to the ciliary muscles becoming less powerful,

A convex lens is used for correcting long signu

The degree of long sight increases vith age.

5. A long sighted person has his least distance of

distinct vision less than 25 cm.

Which of the following alternatives is true?.

A. All of them C. 2, 3 and 4 only E. 1,3 and 5 OAL B. 1,2,3 and 5 only D. 1,2,3 and 4 only

3FE

(25) Which of the following statements are true?

1. Loss of accommodation is one of the cause of

short sight

2. The far point of a numan normal eye is 25cm.

3. Astigmatism is corrected by wearing cylindrical

lenses.

The iris controls the amount of, 11 ent enterang the eye.

5. The cause of snort-sigst is partly due to that

the diameter of the eye-ball is too long. Which of the following

ves is true?

A. 3,4 and 5 only C. 1,3 and 5 only E. 2 and 4 only

B. 3 and 4 only D. 2,3 and 5 only

The final image formed by a microscope 19 1. real

3. virtual

2. inverted 4. érect

which of the following

P. 1,2 and 5 only

0.1 and 4 only

R. 2 and 3 only.

5. always twice as big as the intermediate image alternatives is true?

S. 3 and 4 only 1 and 2 only

(27) The diagram represents an astronomical telescope,

which of the following are true?

B is the objective of the telescope

A is the objective of telescope

3. The magnification-AC/BC

The final image is formed at 25 cm. from the eye The diagram corresponds to the case of normal adjustment of a telescope

Which of the following alternatives is true All of them.

S. 2, 3 and 5 only

Q. 1,2 and 3 only

R. 2.3 and 4 only

T. 1.4 and 5 only

(28) The eyepiece of a microscope 18-

1. having a longer focal length than the objective

2, used as a magnifying glass.

3, is so situated that its principal focus just above

the first inage

must always be adjusted to give the tinal image

at the near point of the

eye

5. 15 separated from the objective by a dis

very nearly the sum of their focal lengths Which of the following alternatives i

P.. All of them

0.3 and 5 only:

R. 2. 3,4 and S only

true?

5. 1,2 and 5 only

T. 1.2 and 4 an

27