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英文中學會考 物理科試題乙部
105:
PHYSICS
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any FOUR "questions.
PART II
(100 marks!
that two of the questions carry 30 ̃märks each, and must tempted if full marks are to be obtained in this section.
t will be given_for_diagrams,jout only when they make Answer clearer..
Working for all calculations must be shown in detail)
w yourself about 1 hours for this section).
In a school experiment with a constant volume air thermometer, a boy obe tained the following results :
The enclosed air at 0 deg.G reached the instrument's standard volume at a total pressure of 76 cm. of mercury.
The enclosed air at 100 deg.C reached the same volume at a total...
pressure of 103.14 om, of mercury. -"
What value do these results zive for the absolute zero"of temperature) on] the Centigrade scale 7
Draw two clear labelled diagrams of the apparatus which you would use in order to repeat the two parts of the above experiment, indicating how the nolosed volume of air is brought to the required temperature and volum es
in each case.› Suggest what possible slightly erroneous observations on the part of the boy mentioned in part (a) could have led to the somewhat erroneous result. which he obtained for the absolute zero of temperature.
A simple constant pressure air thermometer consists of a capillary tube olosed at one end and contsåning air enclosed by a short thread of mercury. The following readings were taken in an experiment using it :
Length of
Air Coluan (ca.)
39.9 54.6 51.4
Temp
(deg C)
100 B.Pt. of liq. I'
Celoulate (1) the coefficient of expansion of air
(2) the boiling point of liquid Z in deg.C
(30 marka)
B
(a) You are given an ammeter of negligible resistance,
2-volt cell of internal resistance 2 ohms, and 4 resistances of 12 ohms each. Draw three different circuit diagrams showing how you would use some or all of the apparatus provided in order to obtain the following current readings on the ammeter.
(i) 1/3 amp.. -.
(ii) 1/7 amp in two different
ways.
b) An electric fire operates on a 220 volt D.0. supply
It has a resistance of 40 ohms. The cost of using it for 10 hours.is HK$2.42.
Jalculate the cost of one "commercial unit" of electricity, and give the scientific name of this "unit".
(c) If 4.2 joules of electrical energy produce 1 calorie
of heat, at what rate is heat supplied to a room in calories per second by the electric fire mentioned in. part (b) of this question.
(30 marks)
e) State the laws governing the refraction of light at a
plane surface, and describe an experiment to determine the refractive index of a liquid. Make a simple sketch of the graph we could obtain by taking a series of results and state the advantage of plotting such. a graph.
When a small lamp is held 9 feet above the surrace of a pond, the image of the lamp, seen by reflection in the surface, appears to coincide with the image of the bottom of the pond. If the reflective index of water je 4, calculate the depth of the pond. (20 marks)
$
Define the terme mechanical advantage, velocity ratio, and efficiency, and prove the relation between them. Draw a diagram of a double sheaf pulling block and tackle showing where the load is attached and where the effort is applied. What is the velocity ratio of this machine?
A uniform narrow-bore tube closed at one end contains dry air which is enclosed by a thread of mercury 8 cm long. When the tube is placed vertically with the open end upwards, the length of air enclosed is 12.0 cm; when the tube is reversed it is 14.8 cm. Calculate
the atmospheric pressure assuming the temperature remains constant; and find also the length of the air) column if the tube were held horizontally. (Answer correct_to second decimal place)
(20 marks)
:
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三期星
日七月六年一次九一公乍十五國民中
**#*
英文中學會考地理科試題
GEOGRAPHY
fime allowed - Two hours.
Note these instructions carefully
Answer FIVE questions only.
What do you mean by the coefficient of linear expansion of a body? Draw a diagram of an apparatus that might be
Describe the experiment. employed to determine it.
How
would you determine the coefficient of linear expansion from the measurements taken?.
To what temperature must two rods of copper and iron respectively, each 50 cm long and at an initial temperature of 20°C, be heated in order that they may differ by 1 mm_in_length?,
A11 THREE questions in Section A
are compulsory; TWO questions must be answered from Section B including Question 4..
Full marke can be obtained only if sketch-maps and/or diagrams are drawn where they help to illustrate answers..
Section A
Attempt ALL`questions in this section.
2.
الله
3.
1
Study carefully the map provided before answering the following questions. The map must be attached to the answer book.
(a) What is the vertical interval of the contours?)
(b) Which is the highest part of the district? (c) What is the length of the stream A B in feet? (d) braw a bola blue line, X Y, on the map to show the
watershed or water-parting in the western half of the district.
(e) Shade in brown the land between 250 feet and 400 feet. (f) why did the villagers choose S and P for the sites of.
their settlements?
(g) Draw a red line on the map to represent a foot-path
that you think is the easiest route for the villagera to go from H to P..
(h) The valley of the stream A B has been chosen as the site of a reservoir, and the villagers will be moved elsewhere. State the natural advantages in support of such a scheme.
(i) On the map draw a dam CD in green and colour in blue
the reservoir which would result.
Answer ALL the following questions
a) Explain with the aid of a diagram why a degree of latitude is almost constant in length anywhere, whereas a degree of longitude varies.
(b) Give the main characteristics of the Mediterranean
type of climate, and state in which areas of countries this climate is found other than around the Mediterranean Sea.
(c) Briefly name the stages through which surface water passes in the process of becoming rain. (a) Name three climatic and two Geological factors which
affect the distribution of Natural Vegetation.
(e) Draw labelled diagrams to account for the variation
in sea-level at high-water between Spring and Neap. tides.
f) Briefly detail the reasons for the formation of
a Rift Valley
(g) Show by brief notes how water. frost, wind, and sun
erode rocks.
Answer ALL the following questions.
(a) Name four natural sources of pasic. energy used by
industry.
b state three countries which produce tin, and three.
countries which produce copper.
c) what climatic and soll Iactors affect the growing of
rubber and tea..
(d) Give unree reasons why sneep raising is important in
Australia.
1
(e) Give four reasons for the dense population in the
lower Ganges valley.
(f) Make a table detailing the advantages and the
disadvantages. of building a new road as against a new railway in an undeveloped country.
(米箱胡片瓶)
The coefficients of linear expansion or copper and iron are respectively 0.000018 and 0.000012 per degree Centigrade).
(20 marks)
6. (a) A luminous object placed vertically on the principal
axis is 3 cm high and 12 cm from a lens. It produces a real inverted image 1.5 cm high. Is the lens concave or convex? State, why. Find, its focal length graphically.
(b) Draw a simple diagram of a numan eye and a simple
diagram of a lens camera. What advantages has the ey
over such a camera?
(o) A letter O is painted in peacock blue, and a letter A.
is painted in red, both on a yellow background." The whole is illuminated with green light. Explain what you would see.
(20 marks)