Download end of section a

CCC HOH FUK TONG COLLEGE
Mock Examination 2011–2012
Physics Paper 1
Secondary：6
Date：01/03/ 2012
Time allowed：2.5 hours (8:15am – 10:45am)
Marks：120
Name：____________________________
Class：S.6E
Number：_____
GENERAL INSTRUCTIONS
1.
There are TWO sections, A and B, in this Paper. Section A consists of multiple-choice
questions in this question book, while Section B contains conventional questions printed
separately in Question-Answer Book B. You are advised to finish Section A in about 60
minutes.
2.
Answers to Section A should be marked on the Multiple-choice Answer Sheet while answers to
Section B should be written in the spaces provided on Question-Answer Book B. The Answer
Sheet for Section A and the Question-Answer Book for Section B must be handed in
separately at the end of the examination.
SECTION A (MULTIPLE-CHOICE QUESTIONS)
INSTRUCTIONS FOR SECTION A
1.
Read the instructions on the Answer Sheet carefully. Insert the information required in the
spaces provided.
2.
When told to open this book, you should check that all the questions are there. Look for the
words ‘END OF SECTION A’ after the last question.
3.
All questions carry equal marks.
4.
ANSWER ALL QUESTIONS. You should use an HB pencil to mark all your answers on the
Answer Sheet. Wrong marks must be completely erased.
5.
You should mark only ONE answer for each question. If you mark more than one answer, you
will receive NO MARKS for that question.
6.
No marks will be deducted for wrong answers.
1
There are 36 questions. Questions marked with “*” involve knowledge of the extension
component. The last two pages of this question paper contain a list of data, formulae and
relationships which you may find useful.
1
A solid substance at 20 C is heated by a 200-W heater. The mass of the substance is 2 kg. The
figure below shows the variation of the temperature T of the substance with time t. Assume no
energy is lost to the environment.
T / C
100
80
60
40
20
0
5
10
15
20
25
30
35
t / min
Which of the following statements is/are correct?
2
(1)
The boiling point of the substance is 80 C.
(2)
The specific heat capacity of the substance in the liquid state is 1500 J kg1 C1.
(3)
The specific latent heat of fusion of the substance is 2.4  105 J kg1.
A
(1) only
B
(2) only
C
(1) and (3) only
D
(2) and (3) only
Which of the following statements about evaporation are correct?
(1)
A liquid releases energy to the environment for evaporation to take place.
(2)
Evaporation produces a cooling effect.
(3)
During evaporation, the internal energy of the remaining liquid decreases.
A
(1) and (2) only
B
(1) and (3) only
C
(2) and (3) only
D
(1), (2) and (3)
2
*3
Two samples of neon gas in containers X and Y are characterized by the following information.
container
Number of neon molecules
volume of neon gas
temperature of neon gas in K
X
N
V
T
Y
2N
3V
1.5T
If the pressure of the neon gas in container X is P, what is the pressure of the gas in container
Y?
*4
5
A
0.5 P
B
P
C
1.5 P
D
2P
Which of the following is/are the assumption(s) of the kinetic model of an ideal gas?
(1)
The size of each molecule in the ideal gas is negligible.
(2)
The mass of each molecule in the ideal gas is negligible.
(3)
All molecules have the same amount of kinetic energy.
A
(1) only
B
(3) only
C
(1) and (2) only
D
(1) and (3) only
A car travelling at a speed of 50 km h1 crashes into a wall and stops after 0.8 s. What is the
average deceleration during the impact?
*6
A
17.4 m s2
B
40 m s2
C
62.5 m s2
D
225 m s2
A ball is projected horizontally from a table and reaches the ground after a certain time.
3
The ball is then projected horizontally from the same position at a higher speed. Which of the
following statements about the ball is incorrect?
7
A
It reaches the ground at a position further away.
B
It reaches the ground after a longer period of time.
C
It reaches the ground at a higher speed than in the first projection.
D
The acceleration of the ball in the air is the same as that in the first projection.
A man drove his car on a road and applied the brake to come to a stop. On another occasion, he
drove at a higher speed along the same road and stopped his car similarly. He recorded the two
driving experiences as shown below.
Occasion
Initial speed
stopping distance
I
25 m s-1
5m
II
50 m s-1
Xm
If all other forces may be neglected, what is X?
8
A
10 m
B
20 m
C
30 m
D
40 m
Bill walks along a straight pavement. The figure below shows his velocitytime graph.
v / m s1
1.5
1
0.5
0
2
4
6
8
10 12
t / min
14
16
0.5
1
1.5
When does Bill return to the starting position?
A
At t = 8 min
B
At t = 12 min
4
9
C
At t = 15 min
D
At t = 16 min
Ball X is thrown vertically upwards with an initial velocity of 10 m s 1 from the ground at t = 0.
Ball Y is thrown vertically upwards with the same initial velocity from the same position at
t = 0.5 s. When will the two balls meet in air?
10
A
At t = 0.77 s
B
At t = 1.02 s
C
At t = 1.27 s
D
At t = 1.52 s
Three blocks X, Y and Z connected by light inextensible threads are placed on a smooth
horizontal surface. A stone is placed on the top of Y. A force, F, is applied to X to pull the
whole system to the right with constant acceleration.
If the stone is taken away from Y and the force F remains the same, how would the tensions T1
and T2 in the connecting threads change?
11
Tension T1
Tension T2
A
increase
increase
B
increase
decrease
C
decrease
increase
D
decrease
decrease
Block X is initially at rest on a rough table. Block Y is connected to block X by an inextensible
string over a pulley as shown below. The masses of blocks X and Y are 3 kg and 2 kg
respectively.
X
Y
5
Block Y is then released and block X starts to move towards the right. The friction acting on
block X is 4 N. What is the total kinetic energy of the system after block X has moved by
50 cm?
*12
A
7.81 J
B
9.81 J
C
22.5 J
D
24.5 J
A small body of mass 0.05 kg is swinging in a vertical circle at the end of a string of length
2.0 m.
2.0 m
0.05 kg
If the speed of the small body at the lowest point in the circular path is 2.0 m s-1, what is the
tension in the string?
13
A
0.39 N
B
0.49 N
C
0.59 N
D
0.69 N
A block of mass 2 kg is initially at rest on a horizontal smooth surface. A horizontal force F is
applied to the block. The variation of F with time t is shown in the graph below.
F/N
8
F
2 kg
0
3
t/s
6
What is the work done by the force on the block from t = 0 to 3 s?
*14
A
12 J
B
36 J
C
72 J
D
144 J
An object is initially at rest. Suddenly it explodes into three fragments of masses 2 kg, 8 kg and
10 kg. The 8-kg and 10-kg fragments fly away with speeds 4 m s1 and 6 m s1 respectively, at
an angle of 60 to each other. What is the speed of the 2-kg fragment?
15
A
34 m s1
B
39.8 m s1
C
40.4 m s1
D
46 m s1
In which of the following arrangements of mirrors, light is returned in opposite direction from
which it came?
16
A
(1) and (2) only
B
(1) and (3) only
C
(2) and (3) only
D
(1), (2) and (3)
A light ray in medium Y travels towards an interface. Part of the light ray emerges to medium X
while the remaining part is reflected back to medium Y. It is known that   .
medium X
medium Y

 
7
Which of the following deductions is/are correct?
(1)
The refractive index of medium X is smaller than that of Y.
(2)
Total internal reflection occurs.
(3)
If a light ray in medium X travels into medium Y, it will split into two rays after passing
the interface.
*17
A
(1) only
B
(2) only
C
(3) only
D
(1) and (3) only
John views an object of height 1 m through a lens. He can observe an image of height 25 cm. If
the object is 2 m away from the lens, which of the following can the lens be?
18
A
A convex lens of focal length 40 m
B
A concave lens of focal length 40 cm
C
A convex lens of focal length 67 m
D
A concave lens of focal length 67 cm
A wave of amplitude 6 cm travels 2 wavelengths in 4 s. Which of the following statements
about the wave is correct?
19
A
The frequency of the wave is 0.25 Hz.
B
A particle on the wave travels a distance of 24 cm in 1 s.
C
The wave speed is 0.5 cm s1.
D
The average speed of a particle on the wave is 12 cm s1 in 1 period.
In a pond, a train of water wave is travelling towards a shallow region. Before entering the
shallow region, the wavelength and the period of the wave are  and T respectively. X is a point
on the water surface in the shallow region and is 2 away from the wave at time t = 0.
travelling direction
X
2
shallow region
Which of the following is a possible displacementtime graph of X in the next 3T?
8
A
displacement
T
B
3T
time t
displacement
C
T
2T
3T
time t
T
2T
3T
time t
T
2T
3T
time t
displacement
D
20
2T
displacement
In the following figure, one end of a string is fixed to a vibrator and the other end is fixed to a
wall. As the vibrator is turned on, a stationary wave is formed on the string.
string
vibrator
wall
Now, the length of the string, as well as the distance between the vibrator and the wall, is
reduced by half. If the frequency of the vibrator remains unchanged, what will happen to the
string?
A
A stationary wave of half loop is formed on the string.
9
*21
B
A stationary wave of 1 loop is formed on the string.
C
A stationary wave of 2 loops is formed on the string.
D
No stationary wave is formed on the string.
A beam of monochromatic green light passes through a double-slit and the following
interference pattern is formed on a screen.
Which of the following methods can increase the number of fringes on the screen?
22
23
(1)
Change the monochromatic green light to monochromatic red light.
(2)
Increase the width of each slit.
(3)
Reduce the distance between the double-slit and the screen.
A
(1) only
B
(3) only
C
(1) and (2) only
D
(2) and (3) only
When air temperature is increased, which of the following statements is/are correct?
(1)
Velocity of sound in air increases.
(2)
Wavelength of the same note travelling in air increases.
(3)
Frequency of the note increases.
A
(1) only
B
(1) and (2) only
C
(2) and (3) only
D
(1), (2) and (3)
direction of travel of
the incident pulses
free end
10
The figure above shows the incident pulse on a string. The pulse approaches the free end and is
reflected. Take upward displacement as positive. Which of the following s-t graphs best
describes the motion of point A?
A
B
C
D
(For Q2425). The iron in the figure is designed to operate at 220 V. It has 3 heating elements X, Y
and Z. The resistances of X, Y and Z are 40 , 10  and 10  respectively.
X
Y
Z
C
to 220 V
mains supply
fuse
24
25
Which of the following is a suitable fuse value for the iron?
A
5A
B
8A
C
13 A
D
26 A
What is the power dissipated by the iron if it is connected to the 110 V instead of the 220 V
mains supply in the setting as shown?
A
202 W
B
303 W
C
807 W
D
1210 W
11
26
In the following circuit, the battery has an internal resistance of 1 .
12 V
4
6
8
2
V
What is the reading of the voltmeter?
*27
A
2V
B
2.4 V
C
3V
D
8V
P, Q, R and S are four particles carrying charges of the same magnitude. They are fixed at the
four corners of a square. Z is the centre of the square. Position X is equidistant from P and Q
while position Y is equidistant from R and S.
P
S
Z
X
Y
Q
R
It is known that P attracts Q, S repels R and R repels P. Which of the following is/are correct?
(1)
The electric forces acted on Q by P, R and S are equal in magnitude.
(2)
The electric potential at Z is the highest along XY.
(3)
Among the four particles, the electric potential energy of Q is the lowest.
A
(1) only
B
(3) only
C
(1) and (2) only
D
(1) and (3) only
12
28
The diagram below shows a rechargeable cell. The specifications listed on it are 8.4 V and
170 mA h.
Which of the following statements must be correct?
(1)
The capacity of the cell is 612 C.
(2)
The electrical potential energy gained by 8.4 coulombs of charge in going through the
cell is 1 J.
*29
(3)
The internal resistance of the cell is 49.4 
A
(1) only
B
(1) and (2) only
C
(2) and (3) only
D
(1), (2) and (3)
A straight conductor PQ is moving downwards at a steady speed of 0.5 m s1 between two
magnets. The conductor has a resistance of 0.5  and is connected to a 3-mV battery. The
magnets have pole faces of 0.2 m  0.1 m and the magnetic flux density between them is 3 mT.
conductor
P
N
S
0.2 m
Q
0.1 m
_
3 mV
0
+
What is the reading of the galvanometer when the conductor is moving between the magnets?
A
5.4  103 A
B
5.7  103 A
C
6  103 A
D
6.3  103 A
13
30
John holds a rubbed metal ruler with his bare hand and brings it near a piece of acetate strip. He
finds that the piece of strip is attracted to the ruler. Which of the following statement(s) is/are
possible explanations for the phenomenon?
31
32
(1)
The metal ruler is charged after it is rubbed.
(2)
The piece of acetate strip is charged.
(3)
The metal ruler and the piece of acetate strip carry like charges.
A
(2) only
B
(3) only
C
(1) and (2) only
D
(1) and (3) only
How is the resistivity of a metal wire affected if its length and its diameter are both doubled?
A
Halved
B
Doubled
C
Quadrupled
D
Unchanged
Which of the following will make the lamp glow brighter?
(1)
Reduce the number of turns on the primary coil.
(2)
Replace the core by another one of larger cross-sectional area.
(3)
Remove the shaded section of the iron.
A
(2) only
B
(1) and (2) only
C
(2) and (3) only
D
(1), (2) and (3)
14
33
A radioactive source emitting  radiation only is placed in front of a G-M tube as shown.
connected
to a scaler
radioactive
source
G-M tube
15 cm
If a paper is inserted between the radioactive source and the G-M tube, how will the count rate
change?
*34
A
The count rate will not change.
B
The count rate will increase sharply.
C
The count rate will decrease sharply.
D
The count rate will decrease slightly.
Uniform magnetic fields B1 and B2 exist in regions P and Q respectively. An electron travels
through the two regions along the path as shown and reaches point X.
Region P
B1
X
Region Q
B2
Which of the following statements is/are correct?
(1)
B2 is stronger than B1.
(2)
B1 points out of the paper.
(3)
B2 points into the paper.
A
(1) only
B
(2) only
C
(1) and (2) only
D
(1) and (3) only
15
35
A G-M counter is used to measure the activity of radioactive sources P and Q. The figure below
shows their decay curves.
counts per min
P
Q
time
Which of the following statements must be correct?
(1)
The half-life of P is longer than that of Q.
(2)
The count rates of P and Q are nearly the same after a long period of time because the
initial count rates of them are the same.
*36
(3)
Source Q ionizes the nearby air more rapidly than source P.
A
(1) only
B
(2) only
C
(1) and (3) only
D
(1), (2) and (3)
144
56 Ba
decays with a decay constant of 0.06 s1. For a given amount of undecayed
144
56 Ba
nuclei,
what percentage of them remain undecayed after one minute?
A
0%
B
2.73%
C
36.6%
D
Cannot be determined
END OF SECTION A
16
List of data, formulae and relationships
Data
R = 8.31 J mol1 K1
NA = 6.02  1023 mol1
g = 9.81 m s2 (close to the Earth)
G = 6.67  1011 N m2 kg2
c = 3.00  108 m s1
e = 1.60  1019 C
me = 9.11  1031 kg
0 = 8.85  1012 C2 N1 m2
0 = 4  107 H m1
u = 1.661  1027 kg
(1 u is equivalent to 931 MeV)
AU = 1.50  1011 m
ly = 9.46  1015 m
pc = 3.09  1016 m = 3.26 ly = 206 265 AU
 = 5.67  108 W m2 K4
h = 6.63  1034 J s
molar gas constant
Avogadro constant
acceleration due to gravity
universal gravitational constant
speed of light in vacuum
charge of electron
electron rest mass
permittivity of free space
permeability of free space
atomic mass unit
astronomical unit
light year
parsec
Stefan constant
Planck constant
Rectilinear motion
Mathematics
For uniformly accelerated motion:
Equation of a straight line
y = mx + c
Arc length
= r
Surface area of cylinder
= 2rh + 2r2
Volume of cylinder
= r2h
Surface area of sphere
= 4r2
Volume of sphere
4
= πr 3
3
v
=
s
=
v2 =
u + at
1
ut + at 2
2
u2 + 2as
For small angles, sin   tan    (in radians)
Astronomy and Space Science
Energy and Use of Energy
GMm
r
P = AT4
f v λ
 
f0 c λ0
A(TH  TC )
Q
=k
d
t
k
U=
d
1
P = Av 3
2
U =
gravitational potential energy
Stefan’s law
Doppler effect
Atomic World
Medical Physics
1
m0 v max 2 = hf   Einstein’s photoelectric equation
2
4
1  m e 
13 .6
En =  2  2e 2  =  2 eV
n  8h  0 
n
energy level equation for hydrogen
atom
h
h
= =
de Broglie formula
p mv
=

1.22 λ
d
Rayleigh criterion (resolving power)
1.22 λ
d
1
power =
f
L = 10 log
rate of energy transfer by conduction
thermal transmittance U-value
maximum power by wind turbine
Rayleigh criterion (resolving power)
power of a lens
I
I0
intensity level (dB)
Z = c
acoustic impedance
2
I
(Z  Z1 )
= r = 2
intensity reflection coefficient
I 0 (Z 2  Z1 ) 2
I = I0ex
transmitted intensity through a
medium
17
A1.
E = mcT
energy transfer during
heating and cooling
D1.
F=
A2.
E = lm
energy transfer during
change of state
D2.
E=
A3.
pV = nRT
equation of state for an
ideal gas
D3.
A4.
pV =
1
Nmc 2
3
kinetic theory equation
A5.
EK =
3RT
2N A
molecular kinetic energy
v  p
=
t  t
Q1Q 2
4 π 0 r 2
Q
Coulomb’s law
4π 0 r 2
electric field strength due to a
point charge
V=
Q
4π 0 r
electric potential due to a
point charge
D4.
E=
V
d
electric field between parallel
plates (numerically)
D5.
I = nAvQ
general current flow equation
D6.
R=
force
D7.
R = R1 + R2
l
resistance and resistivity
A
B1.
F =m
B2.
moment = F  d
moment of a force
D8.
B3.
EP = mgh
gravitational potential
energy
D9.
P = IV = I2R
power in a circuit
B4.
EK =
kinetic energy
D10.
F = BQv sin 
force on a moving charge in a
magnetic field
B5.
P = Fv =
mechanical power
D11.
F = BIl sin 
force on a current-carrying
conductor in a magnetic field
B6.
a=
centripetal acceleration
D12.
V=
B7.
F=
Newton’s law of
gravitation
D13.
B=
D14.
B=
fringe width in
double-slit interference
D15.
=N
D16.
Vs N s

Vp N p
ratio of secondary voltage to
primary voltage in a
transformer
E1.
N = N0ekt
law of radioactive decay
E2.
t1 =
1
mv 2
2
W
t
v2
= 2r
r
Gm1 m 2
r
2
λD
a
C1.
y =
C2.
d sin  = n
diffraction grating
equation
C3.
1 1 1
 =
u v f
equation for a single lens
1
1
1
=
+
R R1 R 2
2
BI
nQt
0 I
2 πr
 0 NI
l

t
ln 2
k
resistors in series
resistors in parallel
Hall voltage
magnetic field due to a long
straight wire
magnetic field inside a long
solenoid
induced e.m.f.
half-life and decay constant
E3.
A = kN
activity and the number of
undecayed nuclei
E4.
E = mc2
mass-energy relationship
18