中四 物理試卷 (F4 Physics Past Paper)
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內容節錄：
GENERAL INSTRUCTIONS
Subject Teacher
ST. PAUL'S COLLEGE
F.4 Mid-year Examination 2019-2020
INSTRUCTIONS FOR SECTION A
Write your Name, Class and Class Number in the spaces provided on this cover. Circle the name
of your subject teacher.
Answer ALL questions in this Paper.
There are TWO sections, A and B, in this paper.
SECTION A: Multiple-choice Questions (28 questions)
Questions are printed in this question book. Answers to Section A should be marked on the
Multiple-choice Answer Sheet.
Mr. Kwok / Ms. Chan
SECTION B: Structural Questions (68 marks)
Questions are printed separately in Question-Answer Book B. Answers to Section B should be
written in the spaces provided in Question-Answer Book B.
Sections A and B carry 35% and 65% respectively. The Multiple-choice Answer Sheet and the
Question-Answer Book B for Section B must be handed in separately at the end of the
examination.
SECTION A (MULTIPLE-CHOICE QUESTIONS)
F.4 Physics 1A Mid-year Exam 19-20
All questions carry equal marks.
ANSWER ALL QUESTIONS. You should use an HB pencil to mark all your answers on the
Answer Sheet. Wrong marks must be completely erased.
You should mark only ONE answer for each question. If you mark more than one answer, you
will receive NO MARKS for that question.
No marks will be deducted for wrong answers.
A lens is put under the sun and a match placed at 3 cm underneath the lens is lit. Which of the
following statements is/are correctly deduced from the situation ?
The lens must be a convex lens.
The focal length of the lens is 1.5 cm.
The image of the sun formed by the lens is a point image (of no definite size).
(1) and (2) only
A lens is placed in front of an object. The focal length of the lens is 12 cm. A virtual
magnified image is formed at a distance of 10 cm from the lens. Which of the following lenses
is used and what is the object distance ?
Type of lens
F.4 Physics IA Mid-year Exam 19-20
Object distance
END OF SECTION A
(1) and (3) only
speed of light in vacuum
acceleration due to gravity
Rectilinear motion
For uniformly accelerated motion :
Mathematics
Equation of a straight line
Surface area of cylinder
Volume of cylinder
Surface area of sphere
Volume of sphere
B2. Moment Fxd
For small angles, sin 0 tane ≈ 0 (in radians)
List of data, formulae and relationships
c = 3.00 x 108 ms
g=9.81 m s2 (Close to the Earth)
S = ut + at²
v² = u² + 2as
F.4 Physics IA Mid-year Exam 19-20
= 2лrh+2πr²
energy transfer during
heating and cooling
energy transfer during
change of state
moment of a force
equation for a single
There are 28 questions. The back cover of this question paper contains a list of data, formulae and
relationships which you may find useful.
A straight bimetallic strip is heated in a flame as shown.
The strip bends downwards when heated. Which of the following statements must be correct?
Metal A expands more than metal B when they are heated.
Metal A have a lower density than metal B.
The strip bends upwards when it is cooled to far below room temperature.
Which of the following statements must be correct?
(1) and (2) only
Internal energy is the energy gained by an object as a result of heat flow.
Heat is the energy transferred from one body to another as a result of a temperature
difference between the bodies.
Temperature measures the energy transferred from one object to another when the
objects are in contact.
(1) and (3) only
F.4 Physics IA Mid-year Exam 19-20
A heater is used to heat each of the following blocks for the same period of time. Which block
has the highest specific heat capacity ?
(1) and (3) only
A heater immersed in water is connected to a kilowatt-hour meter. It is found that 0.2 kW h is
used by the heater in 2 hours. If half of the energy is lost to the surroundings, what is the total
energy gained by the water ?
(1) and (2) only
(1), (2) and (3)
Increase in Temperature
The specific heat capacity of ice and water are 2100 J kg-¹ °C-¹ and 4200 J kg-¹ °C-¹
respectively. Which of the following statements is/are correct?
The heat required to raise the temperature of ice by 1 °C is greater than that of
The heat removed when the temperature of ice decreases by 1 °C is smaller than that of
When ice of 1 kg at -10 °C is mixed with water of 1 kg at 5 °C, the temperature of the
mixture is higher than 0 °C.
(1) and (3) only
The apparatus below is used to find the specific latent heat of vaporization of water.
Which of the following factors will make the result obtained smaller than the true value?
Some energy supplied by the heater is lost to the surroundings.
Some water splashes out of the cup as it boils.
Some steam condenses and drips back into the cup.
(1) and (3) only
F.4 Physics IA Mid-year Exam 19-20
(1) and (2) only
(2) and (3) only
A beaker of liquid has the same temperature as the surroundings. When the liquid evaporates,
which of the following statements concerning the molecules in the liquid is correct ?
(1) and (2) only
(1), (2) and (3)
The potential energy of the molecules increases.
The potential energy of the molecules decreases.
The total internal energy of the molecules increases.
The total internal energy of the molecules decreases.
There are 3 beakers of identical shape holding the same amount of hot water at 60 °C. Beaker
X is uncovered. Beaker Y is covered. Beaker Z is uncovered and is painted black (Figure a).
The variation of their temperatures T with time t is shown in Figure b.
Which of the following statements is/are correct?
Curve A corresponds to beaker Z.
Curve B corresponds to beaker X.
The room temperature is 30 °C.
Which of the following is/are incorrect?
(2) and (3) only
(1), (2) and (3) only
Distance is a vector which has both magnitude and direction.
Displacement is a vector which has both magnitude and direction.
Speed is a scalar which has magnitude only.
Time is a vector which has both magnitude and direction.
F.4 Physics IA Mid-year Exam 19-20
A minibus starts from rest and speeds up at 2 m s2 for 2 s along a straight road. Then it slows
down at 0.3 m s2 for 1 s. What is the final speed of the minibus ?
(1) and (3) only
(1), (2) and (3)
A stone is released from a certain height above a planet's surface. It falls a distance of 7.5 m
during the first 3 s. What distance it will fall during the first 6 s?
(1) and (4) only
None of the above
A ball is thrown vertically upwards with an initial velocity of 15 m s¹. An equation of motion
is used to calculate the time taken for the ball to move to a displacement of 15 m. Which of
the following expressions shows a correct substitution of appropriate values ?
15-15xt +-x-9.81x1²
15=15x1+x9.81×t²
A car travels along a straight road. It first accelerates from rest, then travels at a constant
velocity, then decelerates to a stop. It then remains at rest. Which graph below best represents
the displacements of the car as a function of time t?
acceleration / m s-²
F.4 Physics IA Mid-year Exam 19-20
(1) The car's velocity is 68 km h¹ at t = 16 s.
(1) and (3) only
A car travels along a straight road. The figure shows its acceleration-time graph, taking its
moving direction as positive. If the car's velocity is 54 km h¹ at t = 0, which of the following
statements is/are correct?
15 15 xt +-x-9.81x1²
The car's average acceleration in these 16 seconds is 0.875 m s-².
The car changes its mov direction at t = 10 s.
15-15xt +=x9.81x1²
(1), (2) and (3)
A ball is dropped from rest and allowed to bounce several times. The graph shows how the
velocity of the ball varies with time. Which of these statements is/are correct?
The ball hits the ground at P.
The ball is moving upwards between Q and R.
The ball is moving upwards between R and S.
(1) and (2) only
A horizontal force F acts on a box which is placed on the floor as shown.
The variation of F with time t is shown in the figure below.
F.4 Physics IA Mid-year Exam 19-20
If the box does not move, which of the following figures best shows the variation of the
magnitude of the friction f with time t?
Two boxes X and Y are pushed to move on a rough horizontal surface by a force of 60 N as
shown in figure below. The masses of X and Y are respectively 3 kg and 5 kg. Both boxes
move with constant velocity. The friction acting of Y is twice that acting on X.
What is the magnitude of the force acting on X by Y?
In the following figure, a trolley of mass M is put on a horizontal table. A block of mass m is
connected to the trolley by an inextensible string over a smooth pulley. When they are
released, they move with accelerations of the same magnitude a .
mg (m-M) x a
Which of the following expressions gives the friction acting on the trolley?
F.4 Physics IA Mid-year Exam 19-20
Three forces act on a particle such that the particle remains stationary. The figure below shows
two of the forces.
Which of the following arrows best represents the third force ?
gx (M+m) - ma
mg (m + M) x a
In the figure below, a ball of mass m suspended by two strings remains stationary. The
tensions in the strings are T₁ and T2. The acceleration due to gravity is g.
Which of the following is/are correct?
Ti cos 60° = T₂ cos 30°
Ti sin 60° + T2 sin 30° = mg
The resultant force of T₁ and T2 is equal to mg and points vertically upwards.
(2) and (3) only
F.4 Physics IA Mid-year Exam 19-20
A man pulls a box of mass 50 kg and the box accelerates at 1 m s2 up the rough slope. The
friction acting on the box is 60 N. The string makes an angle of 40° to the horizontal and its
tension is T. The slope is inclined at 30° to the horizontal. Find the tension T.
(1) and (2) only
(1), (2) and (3)
rough slope
A weight is hanged on one side of a light lever. Forces F1 and F2 are applied in turn at
positions (1) and (2) respectively so that the lever is balanced in both cases. Which of the
followings is correct?
The magnitude of F₁ > the magnitude of F2 and they are in the same direction.
The magnitude of F₁ > the magnitude of F2 and they are in opposite directions.
The magnitude of F₁ < the magnitude of F2 and they are in the same direction.
The magnitude of F₁ < the magnitude of F2 and they are in opposite directions.
elbow joint
The figure shows a human arm. The forearm and the hand have a total mass of 1.5 kg and
their of gravity C is 15 cm from the elbow joint. Suppose the hand holds a metal ball of
mass 5 kg. The centre of gravity C' of the metal ball is 34 cm from the elbow joint. A force F
applied by the biceps 4 cm from the elbow joint holds the forearm at right angles to the arm.
Find the magnitude of F.
(1) and (2) only
Peter is standing 4 m in front of a plane mirror. A lamp is located midway between Peter and
the mirror. If Peter wants to take a sharp photo of the image of the lamp, at what distance
should he focus ?
F.4 Physics IA Mid-year Exam 19-20
(1) and (2) only
Which of the following statements about total internal reflection of light is/are correct?
It occurs only when light travels from glass to air.
It will never occur if light travels from air to glass.
It will occur if light travels from a medium with refractive index of 1.6 to air
and the angle of incidence is greater than 39º.
Y shows blue light.
Y has a lower speed than X in medium I.
Medium I is less dense than medium II.
Rays of red and blue light enter medium II from a medium I
as shown. Which of the following statements is/are correct?
(2) and (3) only
(1) and (3) only