EXER
日八十月四年添丁麿趸
WAH KIU YAT FO
中會考物理
"PHYSICS
SECTION.C
(a)
Time allowed - Two hours and thirty minutes
(b)
nswer FIVE questions, choosing at least ONE from each section, Mathematical Tables will be supplied. Graph Paper will be supplied on request
()
Give
SECTION A
(a)
Distinguish between Density and Specific Gravity.
[d]
(b)
State Archimedes' Principle,
(0)
BOLT
261
CITY HALL
41
儲
近期
What is meant-by the focal length of a thin canvas lañs 2
II you wors provided with a plane mirror, a pin and a zetort stand, briefly describe (with the aid of a diagram] how you could determine the focal length of a convex lens.
formula relating the focal length of a lens to the distances of image and object from the lens, State clearly the meaning of the symbols) used and explaiq the sign convention adopted.
In an experiment to find the focal length of a convex lens, the following] results were obtained;-
One end of a uniform metal chain of length 20 cins, weight 75 gme, and density 7.5 gms) per sc is suspended by a fine thread from a spring, balance.
A Eureka Can (Displacement Vessel) containing water to à depth of 10 cms, rests on a spring scale which then reads 250 gms.as shown in thọ figure. The chain is slowly lowered into the water, Calculate the readings of the balance and the scale:
(1)
when the bottom of the chain just touches the bottom of the caphy
(1) when all the chain rests on the bottom of the can.
measuring cyunger contains water up to the 30 e. s. mark. On top of the water is a column of oil up to the 50 c. c. mark.
When a solid of Specific Gravity=0,9 is placed in the cylinder it is found that the 'water level rises to the 36 c. c. mark and the oil level rises to the 71 c. c. mark. Find:-
1
Distance of object from lens
50.0 40.0 37.5 35.0 34. Q
Distance of image from Jana
(a)
21.5 24,0 25.0 26. 2 28.0
Use these results, together with the fact that the path of light in reversible, to draw a graph of object distance against image distance Using the lens formula find the relation betwean "u" and "f" when thi
image distance a the object distance, A. Hence find the value of "g" domain your graphi
EITHER by drawing OR by calculation find the distances of the object from a convex lens of focal length 15,0 cms, which will give imagEN/ with a magnífication of 3/
日六廿月五年七六九一曆公年 六十五罗民中
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「新新品
英中會考生物科試題
BIOLOGY
(Time allowed . Two houra and thirty minutes"
·模範英文中學校長
彭瀚天氏出洋考察
禁之至週埗養
英就合理、
中,力,校帳 學誠新 交址南糕
将方近成
[+]
the mass of the solid,
liv
the density of the oil,
*15)
(1)
State ShellO
(1)
What le maant by "Critical Angle" and how is it pälated ti refractiva index 7
Candidate No.
Please turn oyéz.
G
Draw a carefully labelled diagram showing how you would produce pure spectrum of white light on a screen.
The diagram below shows a glass block ABCD and two pine P
and P
Answer ALL questions in Part I and ZOUR questions in Pari LL
PART 1 180 marks)
All answers in Part 1 must be written on the question paper and handed |- with your answer book at the end of the examination.
da)
State ŽIVE methods which are commonly used to preserve food for some considerable time,
(1)
(ii)
મા
(a)
Define
(a)
a foot pound."
(11)
ib
(e)
(d)
(3)
()
the efficiency of a macnus.
What is meant by the statement that the Mechanical Equivalent of] Heat 778 ft. lbs. per B. Th. U. ?
Draw a clear diagram of a single rope pulley system having velocity ratio of 6.
(i) Explain briefly how you could measure the mechanical advantage
of this machine for different loads.
Draw a rough sketch graph of "Mechanical Advantage? ploctur against "Load" showing the type of result you would expect to obtain as the load increased from 0 to a large value.
lii Calculate the effort required to lift a load of 200 lbs, if the]
efficiency of the machine is then 33.
A waterfall is 195,5 t high. If 80% of the snargy of the falling water'
is converted into heat, calculate the temperature difference betwnan the
water at the top and at the bottom of the waterfall.
State the parallelogram jaw of los
(ii) What is meant by a vector quantity
(ift) Which of the following are vector quantities 7
Velocity, Work, Heat, Density, Acceleration, Force, Power
Ah In the diagram a uniform rod AD 12 ft. long
and weighing 10 lbs. In smoothly binged at
point B.2 ft. from Ai so na to make a angle of 30 with the horizontal. A light cord CE of length 4 ft. connects the centre of the rod to a fixed point Ef vertically abrya B-A condentrated load of 2 affikad rigidly to the end of the
123
6)
When viewed from X it is found parallax exists between P, agen through the glass, and the image of P. formed by partial reflection at the face BC. A
If the length. As a Jerne, da se refractive judges.5}] find the distance of P. from P
The Magram below shows combination of göre smartcirculas Rikas bloks fixed together with a very narrow niy baza between the plane egges
FPQ represents
emerges along X
Starting with
is rotated at
is audden On conti
ch passes through the glass and
19 rouhe 134t when this combination
hawa the light emerging along XY which is between 90° and 180*./ by the say again emerges along
s Inder of the glass
(Plesso burà over,
(Lv)
(v)
For each method you mention state why the procedure adoptes shoulą,
ELL)
动
Please turn over
HONG
Lady' (1)}
Batas position of the centre of gravity of the loaded zo
(U)
The sum of the clockwise moments about B
Jill) The tension in the cord CE,
(iv)
The horizontal and vertical components of the sanction
WIRE TO MIKEnë by the statement that the callèlent of Lusse
nd staaž že 0,00001 per 10,?)
Use the above information to abaw that the coefficient of cubital kxpansion of étéol is approximately 0. 00003 per *G,"
A cirmiar steal diso has a efźcular hole cut from
Tind the parcaniaga chingaza
in the circunferance of the holy
(11) £5, the volume of the steni,
when the temperature of the diau riesa by 500 zu
FELGERİ "A" SAUWS'E
kaba in which a 20a colum trapped by a 2" column #f r stnosphoric prassure la 30. and the temperature is 2776- [1] Calculate the new langzia of kir wins the puba fe inves
Diagram
zram "B" assuming the temperature: and atmospheric. remain constant feat (i) At what temperature wil of kir refuza to its original len cik when the tuba ramalno (nye Diagram "O!! »
10
Briefly describe how you could use the apparatus shown above jo Forify Charles' Lawi
What is meant by *
14).
Thermal Capacity
Latent Heat of Fusion
Briefly describe an experiment to determine the Specific Heat of lead ahot and show how the result may be obtained from the readings you take,
211) State two ways in which you could reduce errors due to cooling ind
performing his experiment.
A copper sphere of mass 60 gms.and specific heat » 0. I is at room"} temperature of 20°C).
When the ball is placed in liquid oxygen at its boiling point of LINU*C, ID gms, of oxygen are cosed to evaporate. Find the Latent Heat of Vaporiseidon of liquid oxygen
Please turn over
Equal mates of water and naphthalene are cooled under' similar conditions in identical closed calorimeters. ABC
represents the cooling curve of the
water and PQR the cooling curve of the naphthalene,
N
(i) Why is the slope or the curve
A greater than the slope of the curve at C?
tii State with reason what you
Are able to deduce from the part of
the curve CQR.
would the
strong wind blew
strong wind. Bliv
seconds in vtill wire, How, if at all;
angles fe the line-AB, of the sound,
BRA
Betafly describa a Jabektory experiment to measure the velocity of qound in air uțing a reh panca tibe and a tuning fork of known grekaðarý, Ixplain how the "and correction" of the tube can be Kļimizatadi.
magfiling & TETRICAL CİZE HNnds that the interval between Kyousu mads by him and ita echó la 2. 5 skconds. He then walks 220 yarda) directly wway from the 111ft and finds that the interval is now 3.7
the velocity of sound in siR
the original distanca of the man from the cliff.
Velocity, Frequency, Waveforza, Amplitude, Wavelength, Overto Which of the above tezine ära üksúciated withi=/
(1) tone or quality,
(li) pitch,
(UI) loudness?"
Two stretched wires A and B are made of the same material.
"6 10 twite de igng as B.
(a) Name the parts labelled 1-6
“What is ike approximate age (afler nätching) of the tadpole 7
How does this tadpole obtain its nourishment?
Photosynthesis can be represented by the following equation.
6C0. ↑ 6H2O = CHP + 60,
Name three factors above equation.
ssary for photosynthesis which are not shown in thầ
What type of pugde is formed in the
'The diameter of 3 is twice the djame or of ang
The frequengy of the fundamental note ernitted by & is twice the frequency of the fundsthestal note emitted by Aud
(by
Find the ratio of the tanklans in A and B/
(a)
(1).
Draw a simplified labelled diagram of a Van de Graaff Generatorů) State with reasons what would happen if:
e drawing pin was placed upside down on top of the upper terminal of the generator.
the upper terminal of the generator was duated with powder.
podiumy
Fig. i) shows a gold leaf electroacope and Fig. (1)
a positively charged metal ball suspended by a fire silk thread. KORN IN
Draw simple diagrama to show the distribution of charge and the position of the moving gold leaf when:-
the ball to brought near to (bul hot touching). the outside of the cam
·(is).
the ball is placed inside (bit must fenching). the can
(iii) the ball ta'allowed to touch the inside if
he can
A coil of wire with centre 0 is fixed with) ite plane horizontal,
PQ8 a light unmagnetised stee, neewer of length loan than the internal diameter of the coll
PA is suspendu by suretyminda sortua, attached to ita çentre of gravity O so that it is free to rotate about O la any, direction. strong electric current is passed through the coil in the direction; Whown in the diagram. What is tha effect on the needle ?
Siate with reasons what position the needle PQ will take up en the current is switched off.
(3).
Name THREE possible fates of the sugar formed by photosynthes
((fiid.
This is a drawing of a stage in the life history of the house
Lich
朱完明日縫
Derive a formula which gives the combined resistance of two- resistances R, and R2 connected in parallel
A meter when used as a milliammeter given full scale deflection for al current ol.15mA.
The same meter used as a millivoltmeter gives full scale defleciton fa a potential difference of 75mV, 50% Deduce the resistance, of the 'meter en snów now this mecer coula de modified so as to give full scale deflection for a current of 1.5k pa
Join
fa'ie & muutammeter with internal résistance 100, iyia a millivoltmater with internal résistance 10n
Calculate the reading of each meter when connected in the circuit as shown,
(You may assume that the internal resistance of the cell is negligible.
Please mura over
A resistance to supplied with electrical energy at a constant rate of 5W by a battery of Leclanché cells connected in series. The posnussa difference across the resistance is maintained at 3V./
Find the time for which this pattery will supply energy to the resistance before 17 gms. of zinc is consumed in each cell,
Alectro-chemical equivalent of zinc ≈ 0; 00034 'gma," por