# 中四 物理試卷 (F4 Physics Past Paper)

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F4_Phy_Mid_1B_19-20

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## 中四物理試卷 PDF 下載

INSTRUCTIONS
Subject Teacher
ST. PAUL'S COLLEGE
F.4 Mid-year Examination 2019-2020
Section B: Question-Answer Book B
Mr. Kwok 1 Ms. Chan
Write your Name, Class and Class
Number in the spaces provided on this
cover. Circle the name of your subject
Answer ALL questions in this paper.
answers in the spaces
provided in this Question-Answer Book.
Supplementary answer sheets will be
provided on request. Write your Name,
Class and Class Number, and mark the
question number. Tie them securely
with a string INSIDE this
Question-Answer Book.
F.4 Physics 1B Mid-year Exam 19-20
The diagrams in this section are NOT
necessarily drawn to scale.
A student conducts an experiment to estimate the acceleration g of free fall by dropping a heavy
metal ball from a high wall into a sandpit below. Describe how this student can estimate g of
free fall. Specify all measurements the student has to take and write down an equation for
calculating g. Please state the instruments used to take the measurements. Also, give two
explanations of why the value for g is only an estimate.
F.4 Physics IB Mid-year Exam 19-20
Copper has a melting point of 1085 °C and a boiling point of 2562 °C. The specific heat
capacity of solid copper is smaller than that of liquid copper. A sample of copper is heated
steadily from 0 °C to 1800 °C.
Define the term 'specific latent heat of fusion' of a substance.
Sketch a graph to show how the temperature of the sample changes with time.
the states of the sample in your graph.
The specific heat capacity and specific latent heat of fusion of liquid copper are
370 J kg-¹ °C and 1.31 × 105 J kg-¹ respectively.
to melt 1.5 kg of copper at 1085 °C and raise its
F.4 Physics IB Mid-year Exam 19-20
Describe the change in kinetic energy and potential energy of copper atoms from 0 °C to
How long does a 2000-W furnace take
perature to 1200 °℃ ? (2 marks)
Read the following passage about paper lanterns and answer the questions that follow.
The Consumer Council has tested 33 samples of traditional paper
lanterns for their safety. Traditional lanterns use candles. The
temperature of the hanging point (where the handle meets the
hanging string) above the candle and the outer surface of the base
right below the candle holder are measured.
22 samples were found to reach temperatures above 100 °C at
the hanging point. 4 samples even exceeded 200 °C. Such high
temperatures can potentially cause fires, especially when the
lanterns are put near curtains and clothes.
(Reference: CHOICE No. 347)
Name the main processes by which heat is transferred from the candle to the hanging
The temperature of the outer surface of the base right below the candle holder is much
lower than that at the hanging point. Explain briefly.
F.4 Physics IB Mid-year Exam 19-20
Explain briefly why bamboo handles are preferred to metal handles in traditional paper
END OF PAPER
An illuminated letter "J" is put in front of a concave lens as shown.
Can the image be formed on a screen? Explain briefly.
(c) Draw a ray diagram to show how the image is formed.
A student observes the image directly through the lens from position X. Draw what he
F.4 Physics IB Mid-year Exam 19-20
A breakdown truck of mass 3000 kg drags a car of mass 1500 kg along a level road as shown
below. The truck accelerates uniformly towards the right from rest and attains a velocity of
10 m s¹ in 4 s. Assume that the vehicles travel with the same velocity. The resisting forces
acting on the car and the truck are 500 N and 700 N respectively.
breakdown truck
(a) Find the acceleration of the vehicles.
Show that the tension in the cable dragging the car is 8500 N.
(c) Find the normal force acting on the car by the road.
(d) Find the driving force of the truck.
(e) A soft pad is installed at the rear part of the truck. Explain its function.
F.4 Physics IB Mid-year Exam 19-20
Two cars, A and B, are travelling along the outside lane of a motorway at a speed of 30.0 m s¹.
They are a distance d apart. The driver of car A sees a slower vehicle move out in front of him,
and brakes hard until his speed has fallen to 22.0 m s¹. The driver of car B sees car A brake
and, after a reaction time of 0.90 s, brakes with the same constant deceleration as A.
The diagram below shows velocity-time graphs for car A (solid line) and car B (broken line).
Velocity/m s-¹
F.4 Physics IB Mid-year Exam 19-20
(a) (i) Find the deceleration of the cars whilst they are braking.
(ii) State the minimum value of the initial separation d if the cars are not to collide.
(i) Suppose that, instead of only slowing down to 22.0 m s¹, the cars had to stop. Add
lines to the diagram to show the velocity-time graphs in this case.
the cars come to rest with the same constant deceleration as before.)
(Assume that
(ii) State and explain whether there is the change in (a)(ii).
F.4 Physics IB Mid-year Exam 19-20
The figure shows a pool of water of depth 1.0 m which has a lamp set into the bottom corner as
shown. The angle 8c marked on the diagram is the critical angle for a water-air boundary.
Given that the refractive index of water is 1.33.
(i) the speed of light in water, and
(ii) the critical angle Oc.
F.4 Physics IB Mid-year Exam 19-20
On the figure, draw the continuation of the paths taken by the three rays shown. (3 marks)
A layer of oil is poured over the surface of the water. Without calculation explain how
the critical angle for the water-oil boundary differs from the critical angle, 0c, for the
water-air boundary.
F.4 Physics IB Mid-year Exam 19-20
Find the supporting force Fy by trestle Y.
(b) Find the supporting force Fx by trestle X.
(c) Another workman put a box on the left end of the plank. What is the maximum weight
of the box without making the plank topple ?
A stone of mass 2 kg is hung by a spring balance inside a box. The following figure shows the
whole set-up that is placed on the ground. It is known that the mass of the set-up (including the
2-kg stone) is 6 kg.
The box is then dropped from a height.
(a) If air resistance is taken into consideration, will the acceleration of the box be equal to,
smaller or larger than g? Explain briefly.
It is found that the box finally falls with a constant speed.
(i) Explain why this happens.
F.4 Physics IB Mid-year Exam 19-20
(ii) What is the air resistance when this happens ?
What is the reading of the spring balance when
(i) the box accelerates at g? Explain briefly.
(ii) the box attains a constant speed? Explain briefly.
F.4 Physics IB Mid-year Exam 19-20