Ce Phy Mock Paper A2 Q& A
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HKCEE Mock Examination
Subject : Physics (Paper 2) Time allowed : 1 hour Full marks : 45
1.
Read carefully the instructions on the Answer sheet and insert your name, class and class number 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 PAPER’ after the last question.
3.
All questions carry equal marks.
4.
ANSWER ALL QUESTIONS. You should mark all your answers on the Answer Sheet.
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.
P. 1
There are 27 questions in Section A and 18 questions in Section B. The last page of this question paper contains a list of physics formulae which you may find useful. If necessary, take g = 10 m s-2. Section 1.
A
Which
of
the
following
statements
(1) An object moving at a constant speed must have zero acceleration. (2) An object with zero velocity can be accelerating. (3) An object having zero acceleration can have A. B. C. D. 2.
Which
(1) only (2) only (1) and (3) only (2) and of
the
(3)
following
are
correct?
varying
velocity.
only
statements
about
mass
and
weight
(1) Mass is a scalar and weight is a vector. (2) The mass of an object is a constant but its weight depends on its location. (3) The S.I. unit of weight is A. B. C. D. 3.
are
correct?
kilogram.
(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)
Which of the following pairs of forces F1 and F2 is/are action and reaction pair(s) according to Newton’s third law of motion? (1) F1 = weight of the boy F2 = supporting force from the ground F1 F2
(2)
F2
F1 = weight of the lamp F2 = tension in the wire F1
(3) F1 = magnetic force acting on the left magnet F2 = magnetic force acting on the right magnet F1
F2
P. 2
A. B. C. D. 4.
(3)
only
Two blocks P and Q are connected by a light inextensible string. The string passes over a smooth pulley as shown. The blocks are released from rest. The string breaks a short time after the blocks are released. Which of the following statements is the best description of the subsequent motions of blocks P A. B. C. D.
5.
(1) only (3) only (1) and (2) only (2) and
P smooth horizontal surface
Q
and
Q?
Block P stops immediately and block Q accelerates. Blocks P and Q move at different speeds. Block P moves at a constant speed and block Q accelerates. Both blocks P and Q accelerate.
Two identical balls A and B are thrown from the top of a building to the ground. Ball A is thrown vertically upwards at a speed of 5 m s-1 while ball B is thrown vertically downwards at the same speed. Which of the following statements are correct? Assume that air resistance is negligible. (1) The speeds of the balls just before hitting the ground are the same. (2) The kinetic energies of the balls just before hitting the ground are the same. (3) The balls reach the ground at the same A. B. C. D.
6.
7.
(1) only (3) only (1) and (2) only (2) and (3) only
Energy is transferred to two copper blocks X and Y at the same rate. The graph shows how the temperatures of the blocks change with time. The ratio of the heat capacity of block X to that of block Y is A. B. C. D. Which
time.
temperature / °C
4:1 2:1 1:2 1:4 of
75
X
50
Y
25 time
0
the
following
is/are
related
to
heat
transfer
(1) The double glass walls in a thermal flask are painted silvery. (2) We feel warm when we sit beside lumps of burning coal. (3) Astronaut suits are usually white
P. 3
through
in
radiation?
colour.
A. B. C. D.
8.
(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)
Which of the following statements about a liquid-in-glass clinical thermometer is INCORRECT? A. B. C. D.
It has a constriction near the bulb. It has a narrow working temperature range. It should be sterilized in boiling water before it is used. The wall of its bulb and tube is thin.
9.
rice congee A bowl of rice cools down faster than a bowl of congee of the same initial temperature. Which of the followings could be a possible explanation? A. B. C. D.
The bowl of rice has a higher heat capacity than the bowl of congee. Rice has a higher specific heat capacity than congee. The bowl of rice has a greater mass. The water content of the bowl of rice is lower.
10. A liquid of mass 0.5 kg is heated in a polystyrene cup with a 1000 W heater. The graph shows how the temperature of the liquid varies with time. What is the latent heat of vaporization of the liquid? A. B.
temperature / °C
115
360 000 J 600 000 J 25
C. D.
11. Statement 1: Sound Statement 2: Sound A. B. C. D.
time / min
720 000 J cannot be determined wave waves
3
is cannot
a travel
9
longitudinal through a
wave. vacuum.
Both statements 1 and 2 are correct and statement 2 is a correct explanation for statement 1. Both statements 1 and 2 are correct but statement 2 is not a correct explanation for statement 1. Statement 1 is correct and statement 2 is incorrect. Statement 1 is incorrect and statement 2 is correct.
12. A transverse wave is travelling to the
direction of travel of the wave A
D
G
P. 4 B
F C
E
right.
At
A. B. C. D.
13.
the
instant
as
shown,
which
particle
is
moving
upwards?
Particle A Particle B Particle C Particle D
8 cm
8 cm
8 cm
10 Hz
20 Hz
40 Hz
The above ‘frozen’ wave patterns are observed using a stroboscope at different strobe frequencies. Which of the following is a possible wavelength of the wave? A. B. C. D.
1 cm 2 cm 4 cm 8 cm
14. A train of straight water waves travels in a deep region as shown. The waves pass through a small opening to a shallow region of water. Which of the following figures best represents the wave pattern in the shallow region? A.
shallow region
C.
shallow region
shallow region
deep region
shallow region
B.
shallow region D.
15. In a room ABCD, a tall plane mirror of width 1 m is placed at the middle of the wall BD. The top view of the room is shown in the diagram. A student facing the mirror wants to see the objects placed at corners A and C at the same time. At
A
B
4m
P. 5
mirror
C
1m
D 9m
most
how A. B. C. D.
far
can
he
stand
away
from
the
mirror?
2.25 m 3m 5m 6m
16. A beam of light travels from a crystal to air as shown. What is the refractive index of the crystal? A. B. C. D.
0.93 1.08 1.29 1.98
17. Which of the following figures are INCORRECT? (Note: F and F’ are the foci of the lens.) (1)
(2)
F’
F
F’
F
F’
F
(3)
A. B. C. D.
(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)
18. Sound travels faster in water than in air. Which of the following diagrams best represents how sound waves travel from air to water? The direction of travel of sound waves is represented by a ray. A.
B. air water
air water
P. 6
C.
D. air water
19. Statement 1: Sound is a wave. Statement 2: Sound shows A. B. C. D.
air water
the
properties
of
diffraction
and
interference.
Both statements 1 and 2 are correct and statement 2 is a correct explanation for statement 1. Both statements 1 and 2 are correct but statement 2 is not a correct explanation for statement 1. Statement 1 is correct and statement 2 is incorrect. Statement 1 is incorrect and statement 2 is correct.
20. Which of the following statements about microwave and infrared radiation are correct? A. B. C. D.
Their colours are not the same. They travel in vacuum at a different speed. Their frequencies are not the same. Only microwave can be used to
cook
food.
21. Mary finds that a negatively charged ruler can pick up some tiny pieces of paper. Which of the following statements are correct? (1) The paper is acted on by an electric force stronger than its weight. (2) The paper must carry a positive net charge. (3) Positive charges are induced at the part of the paper A. B. C. D.
near
(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)
22. Resistance wires A and B as shown are made of the same material. Wire A has a diameter of d and a length of L. Wire B has a diameter 2d and a length of 4L. If the resistance of wire A is R, what is the resistance of wire B?
L d
4L 2d
wire A
P. 7
wire B
the
ruler.
A. B. C. D.
3R 2R R 0.5R 6V
23. Three resistors are connected to a 6 V battery as shown. Which of the following statements are correct? (1) The power dissipated in the two 10 Ω resistors are the same. (2) The total power dissipated in the resistors is 3.6 W. (3) The total power dissipated is larger if all resistors are connected in series.
10 Ω
10 Ω
20 Ω
A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) 24. The figure below shows a toaster. A fuse is installed to protect the toaster but the earth wire is missing. Which of the following statements are true if the live wire accidentally touches the metal case of the toaster? L N
(1) The fuse will melt and break the circuit. (2) A large current will flow through the neutral wire. (3) The metal case will carry a high voltage. A. B. C. D. 25. In the Which
toaster
heating element
(1) only (3) only (1) and (2) only (2) and (3) only figure, of
the rider the
(1) The net force acting on the rider is zero. (2) The friction between the rider and the rails is larger than the magnetic force acting on it. (3) The friction between the rider and the rails becomes smaller when the current through the rider decreases.
remains following
stationary on statements
connected to a d.c. power supply _ +
horizontal rails. is/are correct?
S-pole copper rider
N-pole copper rails
A. B. C. D.
the
(1) only (2) only (1) and (3) only (2) and (3) only
P. 8
magnadur magnet
26. In the set up as shown, what will happen when the d.c. power supply is switched on? coil
N N
clockwise direction
S S carbon brush
carbon brush
+ _ connected to d.c. power supply
A. B. C.
The coil rotates anticlockwise continuously. The coil rotates clockwise continuously. The coil first rotates clockwise and then anticlockwise. Eventually, the coil comes to rest at its vertical position. D. The coil first rotates anticlockwise and then clockwise. Eventually, the coil comes to rest at its vertical position. 220 27. Radon ( 86 Rn ) decays by emitting an α particle and two β particles to form an isotope of radon. The isotope formed can be represented by A. B. C. D.
216 86
Rn
218 86
Rn
222 86
Rn
226 86
Rn
Section B 28. Three iron blocks A, B and C of mass 2 kg, 1 kg and 1 kg respectively are kept under the same condition. Which of the following statements is INCORRECT? A. B. C. D.
29. Which
Block A has the largest amount of internal energy. Block B and C has the same amount of internal energy. The average kinetic energy of the molecules in block A is the same as that in block B. Energy is transferred from block A to block B when they are in contact.
of
the
following
statements
is/are
(1) Metals are good conductors of heat because they contain free electrons. (2) Heat cannot be transferred through a vacuum. (3) Heat cannot be transferred through a solid A. B. C. D.
(1) only (2) only (1) and (3) only (2) and (3) only
P. 9
by
correct?
convection.
30. A student standing on a stage throws a small ball upwards at an initial speed of 15 m s-1 from a height of 5 m above the ground. What is the speed of the ball just before it hits the ground? A. B. C. D.
16.0 m s-1 17.0 m s-1 18.0 m s-1 19.0
m
s-1
31. In a linear air track experiment, two riders A and B of the same mass 0.1 kg move towards each other at 2 m s-1 and −3 m s-1 respectively as shown. Assuming that the collision is elastic, which of the following statements are correct?
vA = 2 m s−1
vB = −3 m s−1
rider A
rider B
(1) The total kinetic energy of riders A and B is conserved before and after collision. (2) The total momentum of riders A and B after collision is 0.5 kg m s-1. (3) The total kinetic energy of riders A and B after collision is
0.65
J.
A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) 32. A bullet of mass 10 g hits a sandbag at a speed of 500 m s-1. It travels 0.3 m in the sandbag and emerges at a speed of 100 m s-1. Find the average retarding force exerted by the sandbag on the bullet. A. B. C. D.
850 N 2000 N 2650 N 4000 N
33. A water skier is pulled by a speedboat as shown. The skier travels at a constant velocity v. The tension in the rope is 200 N. The magnitude of the resultant force acting on the water skier is A. B. C. D.
speedboat
30° water skier
0 200 sin 30° N 200 cos 30° N 200 N
v
34. A boy pulls a 15 kg block with a constant force of 300 N that makes an angle of 60° with the horizontal. The friction between the block and the ground is 60 N. What is the work done by the boy after displacing the block 3 m to the right? A. B. C.
300 N
60°
180 J 270 J 450 J
60 N
P. 10
D.
900
J
35. A student uses a vibrator to generate a transverse wave on a string. Figure (a) shows the shape of the string at a certain instant. Figure (b) shows the displacement-time graph of a certain particle on the string. Which of the following expressions represents the speed of the wave? direction of vibration
displacement
direction of travel of the wave
time
0 y z
x vibrator
figure (b)
figure (a)
A. B. C. D.
4xz 9 x z z y 3yz
36. Which of the following statements about antinodal lines and nodal lines are correct? (1) Any two points lying on the same antinodal line have the same path difference from the sources. (2) Crests are formed on all points lying on an antinodal line. (3) Destructive interference occurs on a nodal line. A. B. C. D.
(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)
37. An interference pattern obtained from Young’s double-slit experiment of yellow light with single frequency is shown in the above figure. Which of the following statements is/are correct? (1) Dark fringes are formed at places where constructive interference occurs. (2) The distance between the slits should be close enough for the interference pattern to be observable. (3) The same interference pattern will be obtained if white light is used. A. B. C.
(1) only (2) only (1) and (3) only P. 11
D.
(2) and (3) only
38. In a pool of still water, the sky appears to a diver to be a circular patch of light on the water surface. The diameter of the light patch depends on (1) the depth of the diver. (2) the refractive index of the water. (3) the depth A. B. C. D.
(1) only (3) only (1) and (2) only (2) and
(3)
of
the
pool.
only
39. A step-up transformer has a turns ratio of 1:5. The primary voltage and the primary current are 10 V and 2 A respectively. If the power lost in the transformer is 5 W, what is the secondary current? A. B. C. D.
0.1 A 0.2 A 0.3 A 0.4
A
40. Which one of the following CRO traces represents the note with the highest pitch?
A.
B.
C.
D.
41. An electric field is set up between two parallel metal plates connected to opposite terminals as shown. A positively charged particle is placed at A, B and then C in the above electric field. Which of the following statement is correct?
+
A B
A.
C
The particle experiences the greatest electric P. 12
_
B. C. D.
force at position A. The particle experiences the greatest electric force at position B. The particle experiences the greatest electric force at position C. The electric forces on the particle are the same at positions A, B and C.
42. An average of 720 kW of electric power is sent to a small town from a power plant 10 km away. The transmission lines have a total resistance of 0.50 Ω. Calculate the power loss in the cable when the power is transmitted at 132 kV.
A. B. C. D.
0.149 W 1.49 W 14.9 W 149 W
43. A wire connected to a galvanometer is placed beside a straight current-carrying wire as shown in Figure a. I/A
centre-zero galvanometer
G I
0
1
2
3
4
t/s
5
Figure a Figure b The current I in the straight wire varies as shown in Figure b. Which of the following graphs best represent the reading of the galvanometer? induced current / A
induced current / A
A.
B. 0
1
2
3
4
5
0
1
1
2
3
4
5
2
3
4
5
t/s
t/s
induced current / A
induced current / A
C.
0
2
3
4
5
t/s
D. 0
44. A detector is placed in front of a radioactive source as shown. It is found that the count rate remains almost
1
paper
P. 13
detector radioactive source
t/s
unchanged when a piece of paper is placed between the source and the detector. However, the count rate falls to the background count rate when an aluminium sheet of thickness 5 cm is inserted. What type(s) of nuclear radiation is/are emitted from the source? A. B. C. D. 45. Which
α radiation only β radiation only γ radiation only α and β radiation of
the
following
radioisotope half-life radiation emitted
A. B. C. D.
radioisotopes
P 5 minutes α
is
the
most
Q 2 days β
suitable
R 8 days γ
as
medical
tracer?
S 12 years γ
P Q R S
END OF PAPER Useful Formulae in Physics
(a) Relationships between initial velocity u, uniform acceleration a, final velocity v and displacement travelled s after time t : v = u + at 1 2 s = ut + 2 at v2 = u2 + 2as (b) Potential energy gained by a body of mass m when raised through a height h is mgh. P. 14
1 (c) Kinetic energy of a body of mass m moving with speed v is 2 mv2. (d) Power = force × velocity (e) Equivalent resistance of two resistors R1 and R2 : (i)
in series = R1 + R2
R1 R 2 (ii) in parallel = R + R 1 2 (f)
Power = potential difference × current
1. 2. 3. 4. 5.
B A B C C
11. 12. 13. 14. 15.
B B B C B
21. 22. 23. 24. 25.
B C A B C
31. 32. 33. 34. 35.
B D A C B
6. 7. 8. 9. 10.
C D C D A
16. 17. 18. 19. 20.
D C B A C
26. 27. 28. 29. 30.
C A D C C
36. 37. 38. 39. 40.
B B C C C
P. 15
41. 42. 43. 44. 45.
D C B B C
Subject : Physics (Paper 2) Time allowed : 1 hour Full marks : 45
1.
Read carefully the instructions on the Answer sheet and insert your name, class and class number 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 PAPER’ after the last question.
3.
All questions carry equal marks.
4.
ANSWER ALL QUESTIONS. You should mark all your answers on the Answer Sheet.
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.
P. 1
There are 27 questions in Section A and 18 questions in Section B. The last page of this question paper contains a list of physics formulae which you may find useful. If necessary, take g = 10 m s-2. Section 1.
A
Which
of
the
following
statements
(1) An object moving at a constant speed must have zero acceleration. (2) An object with zero velocity can be accelerating. (3) An object having zero acceleration can have A. B. C. D. 2.
Which
(1) only (2) only (1) and (3) only (2) and of
the
(3)
following
are
correct?
varying
velocity.
only
statements
about
mass
and
weight
(1) Mass is a scalar and weight is a vector. (2) The mass of an object is a constant but its weight depends on its location. (3) The S.I. unit of weight is A. B. C. D. 3.
are
correct?
kilogram.
(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)
Which of the following pairs of forces F1 and F2 is/are action and reaction pair(s) according to Newton’s third law of motion? (1) F1 = weight of the boy F2 = supporting force from the ground F1 F2
(2)
F2
F1 = weight of the lamp F2 = tension in the wire F1
(3) F1 = magnetic force acting on the left magnet F2 = magnetic force acting on the right magnet F1
F2
P. 2
A. B. C. D. 4.
(3)
only
Two blocks P and Q are connected by a light inextensible string. The string passes over a smooth pulley as shown. The blocks are released from rest. The string breaks a short time after the blocks are released. Which of the following statements is the best description of the subsequent motions of blocks P A. B. C. D.
5.
(1) only (3) only (1) and (2) only (2) and
P smooth horizontal surface
Q
and
Q?
Block P stops immediately and block Q accelerates. Blocks P and Q move at different speeds. Block P moves at a constant speed and block Q accelerates. Both blocks P and Q accelerate.
Two identical balls A and B are thrown from the top of a building to the ground. Ball A is thrown vertically upwards at a speed of 5 m s-1 while ball B is thrown vertically downwards at the same speed. Which of the following statements are correct? Assume that air resistance is negligible. (1) The speeds of the balls just before hitting the ground are the same. (2) The kinetic energies of the balls just before hitting the ground are the same. (3) The balls reach the ground at the same A. B. C. D.
6.
7.
(1) only (3) only (1) and (2) only (2) and (3) only
Energy is transferred to two copper blocks X and Y at the same rate. The graph shows how the temperatures of the blocks change with time. The ratio of the heat capacity of block X to that of block Y is A. B. C. D. Which
time.
temperature / °C
4:1 2:1 1:2 1:4 of
75
X
50
Y
25 time
0
the
following
is/are
related
to
heat
transfer
(1) The double glass walls in a thermal flask are painted silvery. (2) We feel warm when we sit beside lumps of burning coal. (3) Astronaut suits are usually white
P. 3
through
in
radiation?
colour.
A. B. C. D.
8.
(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)
Which of the following statements about a liquid-in-glass clinical thermometer is INCORRECT? A. B. C. D.
It has a constriction near the bulb. It has a narrow working temperature range. It should be sterilized in boiling water before it is used. The wall of its bulb and tube is thin.
9.
rice congee A bowl of rice cools down faster than a bowl of congee of the same initial temperature. Which of the followings could be a possible explanation? A. B. C. D.
The bowl of rice has a higher heat capacity than the bowl of congee. Rice has a higher specific heat capacity than congee. The bowl of rice has a greater mass. The water content of the bowl of rice is lower.
10. A liquid of mass 0.5 kg is heated in a polystyrene cup with a 1000 W heater. The graph shows how the temperature of the liquid varies with time. What is the latent heat of vaporization of the liquid? A. B.
temperature / °C
115
360 000 J 600 000 J 25
C. D.
11. Statement 1: Sound Statement 2: Sound A. B. C. D.
time / min
720 000 J cannot be determined wave waves
3
is cannot
a travel
9
longitudinal through a
wave. vacuum.
Both statements 1 and 2 are correct and statement 2 is a correct explanation for statement 1. Both statements 1 and 2 are correct but statement 2 is not a correct explanation for statement 1. Statement 1 is correct and statement 2 is incorrect. Statement 1 is incorrect and statement 2 is correct.
12. A transverse wave is travelling to the
direction of travel of the wave A
D
G
P. 4 B
F C
E
right.
At
A. B. C. D.
13.
the
instant
as
shown,
which
particle
is
moving
upwards?
Particle A Particle B Particle C Particle D
8 cm
8 cm
8 cm
10 Hz
20 Hz
40 Hz
The above ‘frozen’ wave patterns are observed using a stroboscope at different strobe frequencies. Which of the following is a possible wavelength of the wave? A. B. C. D.
1 cm 2 cm 4 cm 8 cm
14. A train of straight water waves travels in a deep region as shown. The waves pass through a small opening to a shallow region of water. Which of the following figures best represents the wave pattern in the shallow region? A.
shallow region
C.
shallow region
shallow region
deep region
shallow region
B.
shallow region D.
15. In a room ABCD, a tall plane mirror of width 1 m is placed at the middle of the wall BD. The top view of the room is shown in the diagram. A student facing the mirror wants to see the objects placed at corners A and C at the same time. At
A
B
4m
P. 5
mirror
C
1m
D 9m
most
how A. B. C. D.
far
can
he
stand
away
from
the
mirror?
2.25 m 3m 5m 6m
16. A beam of light travels from a crystal to air as shown. What is the refractive index of the crystal? A. B. C. D.
0.93 1.08 1.29 1.98
17. Which of the following figures are INCORRECT? (Note: F and F’ are the foci of the lens.) (1)
(2)
F’
F
F’
F
F’
F
(3)
A. B. C. D.
(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)
18. Sound travels faster in water than in air. Which of the following diagrams best represents how sound waves travel from air to water? The direction of travel of sound waves is represented by a ray. A.
B. air water
air water
P. 6
C.
D. air water
19. Statement 1: Sound is a wave. Statement 2: Sound shows A. B. C. D.
air water
the
properties
of
diffraction
and
interference.
Both statements 1 and 2 are correct and statement 2 is a correct explanation for statement 1. Both statements 1 and 2 are correct but statement 2 is not a correct explanation for statement 1. Statement 1 is correct and statement 2 is incorrect. Statement 1 is incorrect and statement 2 is correct.
20. Which of the following statements about microwave and infrared radiation are correct? A. B. C. D.
Their colours are not the same. They travel in vacuum at a different speed. Their frequencies are not the same. Only microwave can be used to
cook
food.
21. Mary finds that a negatively charged ruler can pick up some tiny pieces of paper. Which of the following statements are correct? (1) The paper is acted on by an electric force stronger than its weight. (2) The paper must carry a positive net charge. (3) Positive charges are induced at the part of the paper A. B. C. D.
near
(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)
22. Resistance wires A and B as shown are made of the same material. Wire A has a diameter of d and a length of L. Wire B has a diameter 2d and a length of 4L. If the resistance of wire A is R, what is the resistance of wire B?
L d
4L 2d
wire A
P. 7
wire B
the
ruler.
A. B. C. D.
3R 2R R 0.5R 6V
23. Three resistors are connected to a 6 V battery as shown. Which of the following statements are correct? (1) The power dissipated in the two 10 Ω resistors are the same. (2) The total power dissipated in the resistors is 3.6 W. (3) The total power dissipated is larger if all resistors are connected in series.
10 Ω
10 Ω
20 Ω
A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) 24. The figure below shows a toaster. A fuse is installed to protect the toaster but the earth wire is missing. Which of the following statements are true if the live wire accidentally touches the metal case of the toaster? L N
(1) The fuse will melt and break the circuit. (2) A large current will flow through the neutral wire. (3) The metal case will carry a high voltage. A. B. C. D. 25. In the Which
toaster
heating element
(1) only (3) only (1) and (2) only (2) and (3) only figure, of
the rider the
(1) The net force acting on the rider is zero. (2) The friction between the rider and the rails is larger than the magnetic force acting on it. (3) The friction between the rider and the rails becomes smaller when the current through the rider decreases.
remains following
stationary on statements
connected to a d.c. power supply _ +
horizontal rails. is/are correct?
S-pole copper rider
N-pole copper rails
A. B. C. D.
the
(1) only (2) only (1) and (3) only (2) and (3) only
P. 8
magnadur magnet
26. In the set up as shown, what will happen when the d.c. power supply is switched on? coil
N N
clockwise direction
S S carbon brush
carbon brush
+ _ connected to d.c. power supply
A. B. C.
The coil rotates anticlockwise continuously. The coil rotates clockwise continuously. The coil first rotates clockwise and then anticlockwise. Eventually, the coil comes to rest at its vertical position. D. The coil first rotates anticlockwise and then clockwise. Eventually, the coil comes to rest at its vertical position. 220 27. Radon ( 86 Rn ) decays by emitting an α particle and two β particles to form an isotope of radon. The isotope formed can be represented by A. B. C. D.
216 86
Rn
218 86
Rn
222 86
Rn
226 86
Rn
Section B 28. Three iron blocks A, B and C of mass 2 kg, 1 kg and 1 kg respectively are kept under the same condition. Which of the following statements is INCORRECT? A. B. C. D.
29. Which
Block A has the largest amount of internal energy. Block B and C has the same amount of internal energy. The average kinetic energy of the molecules in block A is the same as that in block B. Energy is transferred from block A to block B when they are in contact.
of
the
following
statements
is/are
(1) Metals are good conductors of heat because they contain free electrons. (2) Heat cannot be transferred through a vacuum. (3) Heat cannot be transferred through a solid A. B. C. D.
(1) only (2) only (1) and (3) only (2) and (3) only
P. 9
by
correct?
convection.
30. A student standing on a stage throws a small ball upwards at an initial speed of 15 m s-1 from a height of 5 m above the ground. What is the speed of the ball just before it hits the ground? A. B. C. D.
16.0 m s-1 17.0 m s-1 18.0 m s-1 19.0
m
s-1
31. In a linear air track experiment, two riders A and B of the same mass 0.1 kg move towards each other at 2 m s-1 and −3 m s-1 respectively as shown. Assuming that the collision is elastic, which of the following statements are correct?
vA = 2 m s−1
vB = −3 m s−1
rider A
rider B
(1) The total kinetic energy of riders A and B is conserved before and after collision. (2) The total momentum of riders A and B after collision is 0.5 kg m s-1. (3) The total kinetic energy of riders A and B after collision is
0.65
J.
A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) 32. A bullet of mass 10 g hits a sandbag at a speed of 500 m s-1. It travels 0.3 m in the sandbag and emerges at a speed of 100 m s-1. Find the average retarding force exerted by the sandbag on the bullet. A. B. C. D.
850 N 2000 N 2650 N 4000 N
33. A water skier is pulled by a speedboat as shown. The skier travels at a constant velocity v. The tension in the rope is 200 N. The magnitude of the resultant force acting on the water skier is A. B. C. D.
speedboat
30° water skier
0 200 sin 30° N 200 cos 30° N 200 N
v
34. A boy pulls a 15 kg block with a constant force of 300 N that makes an angle of 60° with the horizontal. The friction between the block and the ground is 60 N. What is the work done by the boy after displacing the block 3 m to the right? A. B. C.
300 N
60°
180 J 270 J 450 J
60 N
P. 10
D.
900
J
35. A student uses a vibrator to generate a transverse wave on a string. Figure (a) shows the shape of the string at a certain instant. Figure (b) shows the displacement-time graph of a certain particle on the string. Which of the following expressions represents the speed of the wave? direction of vibration
displacement
direction of travel of the wave
time
0 y z
x vibrator
figure (b)
figure (a)
A. B. C. D.
4xz 9 x z z y 3yz
36. Which of the following statements about antinodal lines and nodal lines are correct? (1) Any two points lying on the same antinodal line have the same path difference from the sources. (2) Crests are formed on all points lying on an antinodal line. (3) Destructive interference occurs on a nodal line. A. B. C. D.
(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)
37. An interference pattern obtained from Young’s double-slit experiment of yellow light with single frequency is shown in the above figure. Which of the following statements is/are correct? (1) Dark fringes are formed at places where constructive interference occurs. (2) The distance between the slits should be close enough for the interference pattern to be observable. (3) The same interference pattern will be obtained if white light is used. A. B. C.
(1) only (2) only (1) and (3) only P. 11
D.
(2) and (3) only
38. In a pool of still water, the sky appears to a diver to be a circular patch of light on the water surface. The diameter of the light patch depends on (1) the depth of the diver. (2) the refractive index of the water. (3) the depth A. B. C. D.
(1) only (3) only (1) and (2) only (2) and
(3)
of
the
pool.
only
39. A step-up transformer has a turns ratio of 1:5. The primary voltage and the primary current are 10 V and 2 A respectively. If the power lost in the transformer is 5 W, what is the secondary current? A. B. C. D.
0.1 A 0.2 A 0.3 A 0.4
A
40. Which one of the following CRO traces represents the note with the highest pitch?
A.
B.
C.
D.
41. An electric field is set up between two parallel metal plates connected to opposite terminals as shown. A positively charged particle is placed at A, B and then C in the above electric field. Which of the following statement is correct?
+
A B
A.
C
The particle experiences the greatest electric P. 12
_
B. C. D.
force at position A. The particle experiences the greatest electric force at position B. The particle experiences the greatest electric force at position C. The electric forces on the particle are the same at positions A, B and C.
42. An average of 720 kW of electric power is sent to a small town from a power plant 10 km away. The transmission lines have a total resistance of 0.50 Ω. Calculate the power loss in the cable when the power is transmitted at 132 kV.
A. B. C. D.
0.149 W 1.49 W 14.9 W 149 W
43. A wire connected to a galvanometer is placed beside a straight current-carrying wire as shown in Figure a. I/A
centre-zero galvanometer
G I
0
1
2
3
4
t/s
5
Figure a Figure b The current I in the straight wire varies as shown in Figure b. Which of the following graphs best represent the reading of the galvanometer? induced current / A
induced current / A
A.
B. 0
1
2
3
4
5
0
1
1
2
3
4
5
2
3
4
5
t/s
t/s
induced current / A
induced current / A
C.
0
2
3
4
5
t/s
D. 0
44. A detector is placed in front of a radioactive source as shown. It is found that the count rate remains almost
1
paper
P. 13
detector radioactive source
t/s
unchanged when a piece of paper is placed between the source and the detector. However, the count rate falls to the background count rate when an aluminium sheet of thickness 5 cm is inserted. What type(s) of nuclear radiation is/are emitted from the source? A. B. C. D. 45. Which
α radiation only β radiation only γ radiation only α and β radiation of
the
following
radioisotope half-life radiation emitted
A. B. C. D.
radioisotopes
P 5 minutes α
is
the
most
Q 2 days β
suitable
R 8 days γ
as
medical
tracer?
S 12 years γ
P Q R S
END OF PAPER Useful Formulae in Physics
(a) Relationships between initial velocity u, uniform acceleration a, final velocity v and displacement travelled s after time t : v = u + at 1 2 s = ut + 2 at v2 = u2 + 2as (b) Potential energy gained by a body of mass m when raised through a height h is mgh. P. 14
1 (c) Kinetic energy of a body of mass m moving with speed v is 2 mv2. (d) Power = force × velocity (e) Equivalent resistance of two resistors R1 and R2 : (i)
in series = R1 + R2
R1 R 2 (ii) in parallel = R + R 1 2 (f)
Power = potential difference × current
1. 2. 3. 4. 5.
B A B C C
11. 12. 13. 14. 15.
B B B C B
21. 22. 23. 24. 25.
B C A B C
31. 32. 33. 34. 35.
B D A C B
6. 7. 8. 9. 10.
C D C D A
16. 17. 18. 19. 20.
D C B A C
26. 27. 28. 29. 30.
C A D C C
36. 37. 38. 39. 40.
B B C C C
P. 15
41. 42. 43. 44. 45.
D C B B C
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