MOCK EXAMINATION
A-LEVEL PHYSICS PAPER II
FORM: 7
Date:
Time:
NAME: ______________________
CLASS: 7 B
CLASS NO.: ______
SECTION A. MULTIPLE CHOICE QUESTIONS (30%)
There are 45 questions in this section. Answer ALL questions.
You should spend 1 hour and 45 minutes on this
section. Where necessary, take g to be 10 m s and c to be 3  108 m s-1.
-2
1. To measure the density of a ball, the diameter d
on the ground at the same time.
X is projected
and mass m of the ball are measured and given
vertically upwards at a speed of 10 m s-1 while
by
Y is projected at an angle of 30 to the
d = (20.0  0.2) cm
horizontal at a speed of 20 m s-1. Which of the
m = (50  1) g
following is/are true ?
What is the percentage error in the density of
(1)
the ball ?
A.
1%
B.
2%
C.
3%
D.
5%
positions at the same time.
(2)
X and Y have the same acceleration
throughout the flight in air.
(3)
X and Y have zero speed at their highest
positions.
2. A man kicks a ball coming towards him from
the east.
X and Y reach their respective highest
The ball flies away to the north
afterwards. If
A.
(1) only
B.
(1) and (2) only
C.
(2) and (3) only
D.
(1), (2) and (3)
mass of the ball = 2 kg
speed of ball before kicking = 6 m s-1
5. A car travels on a hump of radius r and when it
speed of ball after kicking = 8 m s-1
passes the highest point H as shown in the
What is the magnitude of the impulse acting on
figure, the driver feels weightless instantly.
the ball ?
The minimum speed on the car at H is
A.
4Ns
B.
8Ns
C.
12 N s
D.
20 N s
v
H
A.
3. A hose reel of cross-sectional area 10 cm2 ejects
-1
water a speed of 10 m s . The water hits a
vertical wall and stops immediately.
Given
that density of water is 1 000 kg m-3, the force
exerted on the wall by the water is
A.
10 N.
B.
50 N.
C.
100 N.
D.
1 000 N.
4. Balls X and Y are projected from the same point
F7EXM2203/CYT/P.1
rg
2
.
B.
rg
.
2
C.
rg .
D.
2 rg
6. When a light spring is loaded with a mass of
500 g, it extends 10 cm.
The period of
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oscillation of the mass in vertical oscillation is
to the inclined surface is
A.
0.10 s.
A.
B.
0.20 s.
C.
0.31 s.
D.
0.63 s.
0.
v
2
B.
C.
v.
D.
2v .
7. The graph in the figure shows how the
displacement x of a particle performing SHM
varies with time t.
10. A satellite performing circular motion around
the earth has its total energy lost due to air
x
resistance in the atmosphere. When it returns
to the earth,
(1)
its total energy decreases.
(2)
its potential energy decreases.
(3)
its temperature increases.
Which of the following statements is incorrect ?
A.
(1) only
A.
The speed is maximum at time t1.
B.
(1) and (2) only
B.
The acceleration is zero at time t2.
C.
(2) and (3) only
C.
The kinetic energy of the particle has a
D.
(1), (2) and (3)
O
t1
t2
t
maximum value at time t1.
D.
The restoring force is maximum at time
t2.
11. Two
charged
metal
plates
are
placed
horizontally with a separation of 5 cm. A p.d.
of 200 kV is connected across the plates. An
8. In the figure, a string wraps around a uniform
oil drop with a charge of –1.6  10-19 C remains
cylinder of radius 0.1 m. A constant force of 5
at rest between the plates. Take g = 10 m s-2,
N is maintained in the string, causing the
the mass of the drop is
cylinder initially at rest to rotate about its
A.
1.6  10-18 kg.
rotational axis.
B.
1.6  10-16 kg.
C.
6.4  10-16 kg.
D.
6.4  10-14 kg.
5N
12. Two cells of negligible internal resistance are
Given that the moment of inertia of the cylinder
connected with two resistors as shown in the
about its axis is 0.2 kg m2, the angular speed of
figure.
the cylinder when the cylinder has performed
P
2
6V
4
12 V
one revolution is
A.
1.8 rad s-1
B.
3.2 rad s
-1
C.
5.6 rad s-1
D.
12.6 rad s-1
Q
What is the potential difference between P and
Q?
9. A wheel rolls down an inclined plane without
slipping as shown in the figure.
X
0V
B.
4V
C.
8V
D.
12 V
v
The speed of the center of mass of the wheel is
v. The instantaneous speed of point X relative
F7EXM2203/CYT/P.2
A.
13. Consider a current passing through a metal wire
with non-uniform cross-sectional area.
The
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cross-sectional area at X is larger than that at Y.
X
C.
(2) and (3) only
D.
(1), (2) and (3)
Y
17. A uniform magnetic field is confined in a
cylindrical volume of radius 10 cm. A circular
Which of the following statements is/are
loop of radius 12 cm is placed so that its plane
correct ?
is perpendicular to the magnetic field. If the
(1)
The drift velocity of electrons at X is
magnetic flux density now increases from 2 T to
smaller than that at Y.
10 T in 0.1 s, what will be the magnitude of the
(2)
The current at X is greater than that at Y.
induced e.m.f. in the loop ?
(3)
If cross-sectional area at X is twice that
A.
1.2 V
at Y, drift velocity of electron at Y is four
B.
2.0 V
times that at X.
C.
2.5 V
A.
(1) only
D.
4.3 V
B.
(1) and (2) only
C.
(2) and (3) only
D.
(1), (2) and (3)
18. The current in a coil changes steadily from 2 A
to 6 A in 100 ms so that a back e.m.f. of 2 V is
induced in the coil. The self-inductance of the
14. A parallel-plate capacitor of capacitance C is
coil is
formed by two rectangular metal plates having
A.
0.02 H.
separation d. Now each of the plates is cut
B.
0.03 H.
into two identical ones to form two capacitors,
C.
0.04 H.
each with plate separation 2 d. What is the
D.
0.05 H.
capacitance when they are connected in series ?
A.
C/8
19. Which of the following statements about a d.c.
B.
C/4
motor is incorrect ?
C.
C
A.
D.
2C
The back e.m.f. developed is greater
when the motor rotates faster.
B.
15. An uncharged capacitor is connected in series
with a switch S, a resistor of 100 k and a
The current will increase if the motor is
stopped suddenly.
C.
When the plane of the coil is parallel to
battery of 6 V. When S is closed, the current is
the magnetic field, no turning moment is
30 A at t = 2 s. The time constant is
produced to the coil.
A.
0.69 s.
B.
0.92 s.
C.
1.37 s.
D.
2.89 s.
D.
An ideal motor has a back e.m.f. equal to
the input voltage.
20. A 10 V battery of negligible internal resistance
is connected to a d.c. motor with armature
16. Which of the following methods can increase
the
current
sensitivity of
a
moving-coil
resistance 2 . A current of 0.5 A flows in the
coil.
The maximum useful output power
galvanometer ?
delivered by the motor is
(1)
Add a shunt resistor to the galvanometer.
A.
1 W.
(2)
Use coil with greater area.
B.
4.5 W.
(3)
Use
C.
5 W.
D.
5.5 W.
weaker
hair-springs
suspension of the coil.
A.
(1) only
B.
(1) and (2) only
F7EXM2203/CYT/P.3
for
the
21. An alternating voltage V is applied to an LRC
series circuit, where the inductive reactance XL,
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the capacitive reactance XC and the resistance R
potentials are 1 V and –2 V.
satisfy the relation XL = 3 XC = 2 R. What is
the phase difference between V and the voltage
VL across the inductor ?
A.
36.9
B.
45.0
C.
61.5
D.
75.0
What is the current flowing through the 10 k
resistor ?
22. In the circuit shown in the figure, the voltage
A.
0.1 mA from X to Y
across the base and the emitter is 0.5 V when the
B.
0.9 mA from X to Y
transistor works.
C.
0.1 mA from Y to X
D.
0.9 mA from Y to X
The current amplification
factor of the transistor is 100.
25. A stationary transverse wave is set up along a
stretched rubber cord. The unstretched length
of the rubber cord is 0.8 m.
When its length is
extended to 1.0 m, the speed of the fundamental
note along the rubber cord is 17 m s-1. What
will be the new speed if the cord is extended to
1.2 m ?
Assume Hooke’s law holds for the
What is the collector current ?
cord.
A.
6 mA
A.
19.6 m s-1
B.
10 mA
B.
21.9 m s-1
C.
15 mA
C.
26.3 m s-1
D.
30 mA
D.
34.0 m s-1
23. The circuit of an op-amp in the figure has an
output potential of 3 V.
26. The critical angle for glass is 40. When a ray
of light is incident from air to glass, the
reflected ray is linearly polarized. The angle
of incidence is
A.
33
B.
40
C.
48
D.
57
27. Two stretched wires are tuned to vibrate
What is the input potential Vi ?
transversely at the same frequency of 1 000 Hz.
A.
-2 V
When the tension in one of the string is
B.
-1.5 V
increased by p%, beat frequency of 5 Hz are
C.
1.5 V
heard as both wires vibrate. p is
D.
2V
A.
0.5.
B.
1.
C.
2.
D.
5.
24. The figure shows an operational amplifier
circuit which uses 15 V supply.
F7EXM2203/CYT/P.4
The input
28. In Young’s double-slit experiment with light of
wavelength 600 nm, a thin sheet of mica of
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refractive index 1.6 is placed in front of one of
one end as shown in the figure.
the slits and the centre of the fringe pattern is
displaced through 4 fringe width.
X
The
Y
thickness of the mica is
A.
150 nm.
X and Y are two points at the middle and the top
B.
1 000 nm.
of the tube respectively.
C.
2 400 nm.
correction, the phase difference between the
D.
4 000 nm.
vibration of the air molecules at points X and Y
Neglecting end
is
29. A diffraction grating ruled with 5 000 lines per
A.
0.
cm is illuminated normally by white light. If
B.
/4.
the wavelengths for red and violet light are 650
C.
/2.
nm and 400 nm respectively, which of the
D.
3 /4.
following statements is correct ?
A.
B.
C.
The violet end of the second-order
33. An astronomical telescope with the objective
spectrum is closer to the central image
lens and the eyepiece separated by 60 cm is
than the red end of the first-order
adjusted to form the final image at infinity.
spectrum.
The focal length of the objective lens is 50 cm.
The
angular
displacement
of
the
The angular magnification of the telescope is
third-order violet light from the central
A.
1.2.
image is sin-10.6.
B.
4.
The second-order image of red light
C.
5.
coincides with the third-order image of
D.
10.
violet light.
D.
There is no fourth-order image for violet
light.
34. A short-sighted person’s greatest distance of
distinct vision is 1.2 m. His sight is improved
by wearing spectacles which increase his
30. A radio produces a sound intensity level of 50
greatest distance of distinct vision to 20 m.
dB at a point 3 m away from it. If the power
The focal length of the spectacle lenses is
output of the radio is doubled, what is the sound
A.
0.85 m.
intensity level at a point 9 m from the radio ?
B.
1.13 m.
A.
43.5 dB
C.
1.28 m.
B.
49.3 dB
D.
1.80 m.
C.
49.8 dB
D.
50.8 dB
35. In
a
compound
microscope
at
normal
adjustment, which of the following statements
31. A radar source, moving with speed v towards a
is/are correct ?
stationary object, emits waves of frequency f
(1)
The first image is real and inverted.
and wavelength .
(2)
The first image is formed at the focal
The reflected waves
reaching a receiver attached to the radar source
will have an apparent wavelength of
plane of the eyepiece.
(3)
The final image is real and inverted.
A.
 - 2 v/f.
A.
(1) only
B.
 - v/f.
B.
(1) and (2) only
C.
2 .
C.
(2) and (3) only
D.
 + v/f.
D.
(1), (2) and (3)
32. A stationary sound wave vibrating in its
36. Two steel wires, X and Y, are suspended
fundamental mode is set up in a tube closed at
vertically and an equal force is applied to the
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lower end of each wire. The extension of X is
of their absolute temperature and the ratio of the
twice that of Y. Which of the following may
r.m.s. speed of the molecules are 1 : 2 and 1 : 3
account for this difference ?
respectively, the ratio of their molecular mass is
(1)
The diameter of X is half that of Y, but
A.
2 : 9.
their lengths are equal.
B.
4 : 9.
X is twice as long as Y, but their
C.
9 : 4.
diameters are equal.
D.
9 : 2.
(2)
(3)
Y is twice as long as X, and its diameter
is twice that of X.
40. The figure displays the trace shown on a CRO
A.
(1) only
when two sinusoidal signals of the same
B.
(1) and (2) only
frequency is applied to the X and Y-plates
C.
(2) and (3) only
respectively.
D.
(1), (2) and (3)
37. In the figure, a non-viscous and incompressible
liquid of density 1 200 kg m-3 flows along a
The phase difference between the signals is
horizontal tube with two sections X and Y of
A.
0
cross-sectional area 3  10 m and 2  10 m
B.
45
respectively.
C.
90
D.
180
-5
2
-5
2
h
41. In an X-ray tube, an accelerating potential V
produces X-rays of minimum wavelength 0.6 
X
Y
10-10 m.
In order to produce X-rays of
minimum wavelength 2.4  10-10 m, the
The velocity of the liquid flowing through X is
accelerating potential should be
-1
0.8 m s . What is the height h ?
A.
V/4.
A.
1 cm
B.
V/2.
B.
2 cm
C.
2 V.
C.
4 cm
D.
4 V.
D.
6 cm
42. The graph in the figure shows how the count
38. Two identical vessels containing an ideal gas,
are connected by an open tube of negligible
volume.
Initially
both
vessels
are
rate A of a radioactive source as measured by a
GM counter varies with time t.
ln A
at
temperature T and pressure P. One vessel is
3
maintained at T, while the temperature of the
other vessel is raised to 2 T. The new pressure
becomes
A.
2 P/3.
B.
P.
The half-life of the source is
C.
4 P/3.
A.
15.5 s.
D.
3 P/2.
B.
25.8 s.
C.
46.2 s.
D.
98.0 s.
0
200
t/s
39. Two different ideal gases, X and Y, are
43. A radioactive source has a half-life of 72 s.
contained in two identical vessels. If the ratio
What would be the activity of the source when it
F7EXM2203/CYT/P.6
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contains 2  105 unstable nuclei ?
and Y of different masses are produced.
-1
A.
1023 s
B.
1925 s-1
correct ?
C.
2785 s-1
(1)
D.
-1
5786 s
Which of the following statements is/are
The mass of Z is greater than the total
mass of X and Y.
(2)
44. In a gold foil scattering experiment, a proton
and an  particle, having the same kinetic
The momentum of X equals to the
momentum of Y in magnitude.
(3)
energy, collide head-on with gold nuclei. The
The kinetic energy of X is equal to the
kinetic energy of Y.
ratio of the distance of the closest approach of
A.
(1) only
the proton to that of the  particle is
B.
(1) and (2) only
A.
1 : 2.
C.
(2) and (3) only
B.
1 : 1.
D.
(1), (2) and (3)
C.
2 : 1.
D.
4 : 1.
45. A stationary nucleus Z decays and two nuclei X
- END OF SECTION A -
F7EXM2203/CYT/P.7
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SECTION B. ESSAY-TYPE QUESTIONS (20%, 48 marks)
Answer any THREE questions from this section. Write your answers in the ANSWER BOOK provided.
You should spend 1 hour and 15 minutes on this section.
1.
(a)
Describe FOUR contrasting features of progressive waves and stationary waves, and state the
conditions necessary for a stationary wave.
(b)
(6 marks)
You play a violin in a room. Explain how you can hear the sound in terms of the progressive waves
and stationary waves produced.
(c)
(3 marks)
A police car and a van are moving with the same speed u towards each other. The siren in the police
car emits sound waves of frequency 1 000 Hz and the velocity of the sound in air is 340 m s -1. With
the aid of a diagram, derive the expressions for the wavelength ’, and the frequency f’ of the sound
waves heard by the driver of the van.
(d)
(4 marks)
Briefly describe how the principle of beats would be used to detect the speed of cars in a police radar
speed check system installed in a police car. (No mathematical derivation is required)
2.
(a)
Explain qualitatively the cause and apparent result of Doppler effect. Give one daily example of
Doppler effect.
(b)
(3 marks)
(2 marks)
A source is emitting sound wave of frequency fs. Assume Sound wave travels with a velocity of c in
air. Deduce the expression for the Doppler effect (i.e. apparent frequency) for the following cases,
(i)
An observer moves towards a stationary source with a velocity of vo.
(ii) A source is moving towards a stationary observer with a velocity of vs.
(c)
(4 marks)
Using results in (b) or otherwise, explain how the speed of an approaching aircraft may be measured
by using microwave radiated from a stationary station on the ground. Derive an expression relating
the speed of the aircraft to the change in frequency between the emitted signal and that received signal
at the station.
(d)
(4 marks)
With the aid of a diagram, describe an experiment to find the speed of sound in air by using Kundt’s
tube together with a loudspeaker. State any precautions which should be taken in the experiment and
explain what would be observed.
F7EXM2203/CYT/P.8
(6 marks)
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3.
(a)
Two large parallel plates which are held vertical with a small separation between them are connected
to a d.c. voltage supply. A thin uncharged foil is mounted on an insulating handle and is lowered
into the region between the two plates. Describe what would happen if
(i)
the foil is brought to various places between the two plates without touching the plates.
Explain.
(ii) the foil is allowed to touch the positive plates first and is brought to various places between the
two plates.
(iii) the two plates are brought closer with everything else left intact after the foil has touched the
positive plates and placed at the middle between the two plates.
(b) (i)
(4 marks)
Discuss the factors which limit the amount of charge that can be deposited onto a capacitor.
Explain the term “spooning charge” and comment on the shape of any conductor used for
spooning charge.
(4 marks)
(ii) Given a high resistance voltmeter, an ammeter, a rheostat, a switch, a d.c. voltage supply and a
stop watch, describe with an aid of a circuit diagram how an unknown capacitance C of a
capacitor can be measured by charging it with constant current.
(5 marks)
(iii) Show that the energy stored in a capacitor is given by ½CV2.
4.
(a)
(i)
(3 marks)
A simple a.c. amplifier can be constructed from a NPN transistor in common-emitter
configuration. Draw a circuit diagram to show how you would construct this amplifier. You
should include in your diagram a d.c. bias circuit, a base resistor Rb, a load resistor RL and
blocking capacitors. State typical values for the components used.
(ii) What are the functions of the blocking capacitors ?
(iii) Derive from first principles the voltage gain of this amplifier to be G =  
RL
.
Rb
State
assumption(s) in your derivation.
(iv) Draw the Input-Output Voltage Characteristic of the amplifier and discuss the physical
significance of the shape. Also, show how an a.c. source can be amplified without distortion.
(12 marks)
(b)
Compare and contrast the differences in characteristics between a NPN transistor amplifier and a
non-inverting operational amplifier.
(c)
(2 marks)
A student argues that the use of amplifiers to increase the magnitude of small a.c. signal is actually
not necessary. Since a step-up transformer with the number of secondary coil greater than that of the
primary coil can step up voltage easily, in most cases amplifiers can be substituted by step-up
transformers with appropriate turn ratio. Do you agree with his argument ? Explain your reasoning.
(2 marks)
F7EXM2203/CYT/P.9
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5.
(a)
(i)
Describe and explain how to obtain a stream of fast-moving electrons. Briefly describe one
method of detecting or tracking the path of an electron beam.
(3 marks)
(ii) Describe an experiment which can be used to measure the specific charge of the electron (e / m
ratio) and explain how the result is obtained from the observation.
(b)
(c)
(5 marks)
State the physical meanings of the following equations with an aid of diagrams:
(1)
Einstein’s Photoelectric equation : hf = 1/2 m vmax2 + 
(2)
Bernoulli’s equation : P + 1/2 v2 +  g h = constant
(5 marks)
Discuss the structure of atom according to Rutherford Scattering Experiment and Franck-Hertz
Experiment.
(3 marks)
- END OF PAPER -
SETTER CODE:
06
F7EXM2203/CYT/P.10
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Useful Formulae in Advanced Level Physics
v2
ω 2 r
r
A1.
a
A2.
a  ω 2 x
simple harmonic motion
A3.
L  I
angular momentum of a rigid body
A4.
T
A5.
1
E  I2
2
B1.
v
T
m
velocity of transverse wave motion in a stretched string
B2.
v
E

velocity of longitudinal wave motion in a solid
B3.
n  tan  P
B4.
d
B5.
d sin   n
B6.
f f(
B7.
10 log 10 (
C1.
F
C2.
V 
C3.
r 3 / T 2  constant
C4.
E
Q
40 r 2
electric field due to a point charge
C5.
V
Q
40 r
electric potential due to a point charge
C6.
E
C7.
C
C8.
Q Q 0 e t / RC
centripetal acceleration
dL
dt
torque on a rotating body
energy stored in a rotating body
refractive index and polarising angle
D
a
fringe width in double slit interference
diffraction grating equation
v uo
)
v u s
Doppler frequency
I2
)
I1
definition of the decibel
Gm1m2
r2
Newton’s law of gravitation
GM
r
gravitational potential
V
d
Kepler’s third law
electric field between parallel plates (numerically)
Q 0 A

V
d
capacitance of a parallel plate capacitor
t / RC
decay of charge with time when a capacitor discharges
C9.
Q Q 0 (1  e
C10.
1
E CV 2
2
energy stored in a capacitor
C11.
I  nAvQ
general current flow equation
C12.
R
C13.
F  BQv sin 
force on a moving charge in a magnetic field
C14.
F  BIl sin 
force on a moving conductor in a magnetic field
C15.
V
BI
nQt
Hall voltage
C16.
B
0 I
2r
magnetic field due to long straight wire
l
A
F7EXM2203/CYT/P.11
)
rise of charge with time when a capacitor is charged
resistance and resistivity
Go on to the next page
C17.
B
 0 NI
l
magnetic field inside long solenoid
C18.
F
 0 I1 I 2
2r
force per unit length between long parallel straight current carrying
conductors
C19.
T  BANI sin 
torque on rectangular current carrying coil in uniform magnetic field
C20.
E  BAN sin t
simple generator e.m.f.
C21.
VS N S

VP N P
ratio of secondary voltage to primary voltage in a transformer
C22.
E   LdI / dt
e.m.f. induced in an inductor
C23.
1
E L I 2
2
energy stored in an inductor
C24.
X L  L
reactance of an inductor
C25.
XC 
1
C
reactance of a capacitor
C26.
P  IV cos 
C27.
Vout / Vin  
power in an a.c. circuit
RL
RB
voltage gain of transistor amplifier in the common emitter
configuration
C28.
V0  A0 (V  V )
C29.
A 
C30.
A1
D1.
pV  nRT  NkT
equation of state for an ideal gas
D2.
1
pV  Nmc 2
3
kinetic theory equation
D3.
Ek 
D4.
E
D5.
1
E  Fx
2
D6.
F 
D7.
E k/r
microscopic interpretation of Young modulus
D8.
1
p v 2 gh constant
2
Bernoulli’s equation
D9.
Q  U  W
first law of thermodynamics
D10.
En  
D11.
N  N 0 e  kt
D12.
t1 
2
Rf
gain of inverting amplifier
Ri
Rf
Ri
3RT 3
 kT
2N A 2
F
A
output voltage of op amp (open-loop)
x
L
dU
dr
13.6
eV
n2
ln 2
k
gain of non-inverting amplifier
molecular kinetic energy
macroscopic definition of Young modulus
energy stored in stretching
relationship between force and potential energy
energy level equation for hydrogen atom
law of radioactive decay
half-life and decay constant
D13.
1
2
mv m hv 
2
Einstein’s photoelectric equation
D14.
E  mc 2
mass-energy relationship
F7EXM2203/CYT/P.12
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MOCK EXAMINATION
F.7 A-LEVEL PHYSICS PAPER II MARKING SCHEME
SECTION A.
MULTIPLE CHOICE QUESTIONS (30%)
No.
1
2
3
4
5
6
7
8
9
10
Answer
D
D
C
B
C
D
B
C
A
D
No.
11
12
13
14
15
16
17
18
19
20
Answer
D
A
A
A
D
C
C
D
C
B
No.
21
22
23
24
25
26
27
28
29
30
Answer
A
C
D
A
B
D
B
D
B
A
No.
31
32
33
34
35
36
37
38
39
40
D
C
C
D
C
Answer
A
A
C
C
A
No.
41
42
43
44
45
Answer
A
C
B
A
B
SECTION B. ESSAY-TYPE QUESTIONS (20%, 48 marks)
F7EXM2203/CYT/P.13
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F7EXM2203/CYT/P.14
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F7EXM2203/CYT/P.15
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6V
RL (~ 15 k)
C2 (~ 10 F)
RB (~ 2 k)
C1 (~ 10 F)
~ input voltage
output voltage
0V
F7EXM2203/CYT/P.16
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F7EXM2203/CYT/P.17
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F7EXM2203/CYT/P.18
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