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̇考教僑靈
英文中學會試題預習専
48. (a) The specific resistance of resistiviy of a
substance is the resistance between my two parallel faces of a centimetre cube of it.
物理科 (廿六)
·陸永熾,
Prveles (26)
(b) 1
47. (a) When current passes through
the coll a magnetis field
developed and the soft iron
is attracted into the coil.
(b) With index attached to the
spring, the variation of eurrent magnitude in the coll moves the index slong a scale.oy the side of the spring.
to If the currant in alternating,
the field developed is
always changing its direction. The apparatus faila so work properly.
d) (1) To convert a galvanometer
into a voltester, a
series resistance must be inserted into the
(1.1 V.: 1 ohm) current in the circuit I
5 ohme
Since R.
1.1 (5+1)
amp.
where is the resistivity or ware
is the length of wire
Therefore
A is the cross-section of wire
品婴
5x5x0.0247
200
- 0.0000314 obm-28.
(e) The heat prodused when a current passe through a wire is proportional to: (1) the square of the aurrent (H«<<I<} (2) the resistance of the wire (H∝ R) (3) the time (H父 t)
'.'. Roc 12At
(a) Since k∞ I2At or B.cc:
1
Before the wire is shortene
v2
H1 oc
and R2 illi length)
ຕົງ
́When 10 volts is impressed across the combined (galvanometer · series) real stance, a surrent of (9.1 x 10−3) amp. must pass through the instrument,
The combined resistance must be.
10
(0.1 x 10-3)
100,000 ohms,
Therefore, the added series resistangs
- 100.000 - 100 - 99900 ohma.
(11)
LOAD
After shortened e
to read a current of 1 ampere, the OXUOSS
(1 − 0.1 x 10-3) amp, must be biased through
shunt read4rance (2).
(1-0,1 x 103) 8 – 0,1 x 10′′3 x 100
- 999.9 - # -0.1 × 100
999.9 -0.01:
bunt resistañes is 0:01 onasi
HO
li £2
That is, the heat evolved is ineressed by
FRevision Exercise
Section A
§1. (a) Distinguish between (1) thruz and (11) pressure,
(6)
The rectangular object drawn is 50 cm. long and has cross-section area 20 #q.©ma It is submerged into water (sis. - 1.0)
Negelecting the air presaure acting on the water surface find:
(1) the pressure acting on the top and the
bottom faces.
(ii) the thrust acting on the top and the
botton faces,
(iii) the upthrust exerted by the water on)
the object.
(e) State Archemedes' principle and show how it
can be verified in this case,
(d) Calculate the mass of copper (4.g. - 8.9) that;
would have to be attached to a piece of paraffin wax (s.g. - 0.9) weighing 20 g tr \ake_at_just aink in glyoerine (s.g. -1.3)
2.1(a) What is meant by
(1) the moment offerorosTabout a point’ 11) the centre of gravity_of_a_rigid body? (b) (1) State Boyle's Law.
(11) Descrihe, with labelled diagram, an
experiment to verify Boyle's law in the Laboratory. You should ind ode the following points:
1) show clearly how the readings taimen, san
be used to verify the law.
2) the precautions to obtain an a courats,
result,
(a) A metal disc of radius 3 in. has a circular place of 1 in, radius cut from it such that the centre of gravity of the remainding portion.
(d) A barometer tube 90 cm. long is filled to two-
thirds its length with mercury. The open end is then closed by the thumb and the tube inserted with ita and (as olosed by the thumb) just below the surface of the mercury in a sistern. If, on removing the thumb, the height of the mercury in the tube is 35 cm, what in the pressure of the atmosphere at that time? 3..(a) (2) State Newton's second law of motion.
(11) Define the coefficient of static friction
between two surface in contrat.
4
(b) Describe a practical method of measuring the
coefficient of statie friction using a rectangular wooden block resting on a wooden board. Mention any precautions which you think are necessary in order to obtain reasonably constant experiment results. (a) A block of mass 150 g, stands on a horizontal planu, A cord from the block passes wer a pulley at the edge of the plane, and ts then attashed to a scale pan. It is found that the block just start to move when the total load
n the an u105
If the dynamic coefficient of friction 13 0.8 timma the statis coeffielsat find how far the blook would slide on the plane ir started with a velocity of 300 gm. per
sec, on the plane,
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各科新生定五月一日開課
遠東航空學校招生
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中文部:韓妃、會計、審計、稔例
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聖公會基恩小學
一九六九
馬來西亞獎學金
年 六月八日前提出
直国旗二千二十三
潘浩之大美雅邦公民
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|米,並須符合台灣 麥在軒尼兼雙
文件
九六八年度各級新生。
校監林推室
湖文集記 五月份新班告
香港商業專科學校
ANIMOR PITMAN有關學會試各班 章程及上
專修班及選修班,讓程均按照英國務會
英文書
ALA ACCA CCS CIS ECC 100.
〇一號二樓,
六月十一日
鄧:聽期不予术
九月堆加章棋多名現在開始辦玮一九六八年第一次
幼稚園高初班