四星
日八月六年一六九一麿公年十五氏
11. A stone dropped down a well takes 3 seconds to reach the water surfac Calculate, (a) the velocity with which the stone hits the water,
and
(Show all your_working)
distance from the top of the well to the surface of the water. (8 is 32 ft/see?).
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頁三第張七第
1日五廿月四年海辛辰
WAH KIU YAT PO
報白
英文中學會考 物理科試題甲部(續昨)
4. In a U-tube a 5 on. column of mercury (Sp. Gr. 13.6) balances a column of
another liquid 70 cms. long. What is the specific gravity of the second liquid? Show your working (correct to, the second decimal place).“
70.cm
.(a)
(b)
12. The figure shows a uniform rod," suspended horizontally from ́& ̄SD
carrying weights of 100 gms, and 200 gms. at its ends..
-
SPRING BALANCE
5. (a) Two bar magnets and soft iron ring were arranged as shown in the
diegram, dusted with iron filings, and tapped so that the filings indicated the lines of force in the magnetic field. Complete the diagram to_show the pattern of_the_iron_filings.į
2005
(100 gm)
(a) if the spring-balance reading is 350 gms what is the weight: (b)_find_the_distance 'x' if the rod is 100 ans. long..
(411 working mast be shown)
N
b) A soft iron magnet"can be demagnetised
$
e) What instrument would you use in order to find out if an insulated body.
contains a charge or statio electricity?
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"Answers:
(a)
(b)
13. The figure, shows an outline of a clinical thermometer, Mark on the
(a) the bore, (b) the scale in decree. intervals..and (o) the nort temperature of the human body..
6. A wire BQ cms, long on a sonometen gives the same note as a tuning-fork of 360"
cycles per second.
(a) When a bridge is placed at a point 50 cas. along the wire the frequency in
the longer segment is
(b) In order to give a frequency of 900 cycles per second in one segment the
length of the segment must be
(Show all your working).
7. (a) When measured with an accurate spring balance the weight of a body at the
North Pole is the same as it is at (the South Pole) and (greater than) it is at
the South Pole)
the Equator (Hong Kong.
the Equator Hong Kong
the saze as (less than
(b) The period of a simple pendulum at latitude 20 South is (greater than
it is at latitude 60 South.
the same as (less than
(Delete the incorrect words in the brackets to leave a correct answer)
6. The figure below. represents 4 horizontal strings passing over frictionles
pulleys (not shown) and carrying weights of 300, 300, x and y grams as marked.\ The strings are joined at P and the diagran represents them as seen from above. The system is in equilibrium. Find the values of x and y.
1. Value of x is.
ii. Value of y is
This thermometer is graduated according to the
14. (a) Define the latent heat or rusion.
Definition
(b) How many calories are required to change 5 gm. of ice at 0- Cito
at 100 C? (Latent Heat of ice is 80 cals/gn, and latent heat is 540 cal/go.)
15. Draw the rays which show how the glass prism below can be used to
`image.
(x gm)
(y
(300 m))
What is 1 horsepower in British (F.P.S.) Units?
A small motor is just able to lift 3.73 Kgms. vertically through 4 metres in *.9 seconds. Calculate the horsepower.
(1 gm. weight is 980 dynės) (1.8.P. is 746 x 107 dynes per sec.)
The horsepower of the motor is:-
1.2 volts and vinta
16. The figure shows a battery of 5 cells, each of e.m.f.
resistance of 1 ohm, connected to an external resistance of 4 ohms. Calculate (a) the current flowing in the circuit,
and (b) the potential difference across the terminals of the bat
Do your calculations the
Answers: (a) the current flowing is
(b) une cotential arrerence is
17. Draw a labelled diagram of a Leclanche cell.
Do your calculation in this space.
(a) A tube x cms. in length, closed at one end, is just long
resonance with a 210 cycles/sec tuning-fork.
State the name of the depolariser,
18.
10. In the pulley-system show, a weight of 50 lbs, on the lower block is, just
lifted by a pull of 20 lbs on the free end of the string.
(a) The percentage efficiency of the
"machine is
((b) Give two different reasons why
the efficiency can re VAK,
be 100%..
20 lbs.
The velocity
enou
336. metres per sec. (neglect end-corrections)..
I
The value of x is
b) The closed end is now opened, and the tube gives resonance with!
fork of frequency
(All working to be shown).
(neglect
19. In the space provided draw two diagrams showing how a short-sighted
sees a distant object (a) without his spectacles, (b) with his
LOAD
20. Draw two pairs of diagrams which illustrate the difference between
waves differing in (a) pitch only, (b) loudness only.
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