Units I-II
(First Grading)
Difficult
Conceptual Understanding
1.
Which two equations represent fusion reactions?
i.
ii.
iii.
a.
b.
2.
1.25 g
2g
0.75 g
1.00 g
c.
d.
+ 30n1
ii and iii only
I, ii and iii
c.
d.
4g
8g
c.
d.
1.50 g
6.00 g
Helium has a mass of 4.0015u for its nucleus. It consists of 2 protons and 2 neutrons.
If the mass of proton is 1.0073u and the mass of neutron is 1.0087u, what is the
mass defect of the helium nucleus?
a. 0.0305 u
b. 1.9842 u
5.
3
1
2He + 0n
4
1
2He + 0n
138
+ 36Kr95
56Ba
If the half-life of Thorium is 24 days, the amount of a 12 gram sample remaining
after 96 days is
a.
b.
4.
→
→
→
A radioactive sample has a mass of 16 g and a half-life of 10 days. What mass of the
original sample remains after 20 days?
a.
b.
3.
i and ii only
i and iii only
2
2
1H + 1H
2
3
1H + 1H
235
+ 0n1
2U
c.
d.
3.9988 u
8.0640 u
Light goes from medium A to medium B with an angle of incidence at 40o and the
angle of refraction at 30o. How will you compare the speed of light in B with that in
A?
a.
b.
c.
d.
The speed of light in B is less than that in A.
The speed of light in B is the same as that in A.
The speed of light in B is greater than that in A.
Any of the above, depending on the specific medium.
37
6.
Which equation represents the decay of Uranium-238 (Z = 92) into another element
by emitting an alpha particle?
a.
b.
c.
d.
7.
3.5 MeV
4.3MeV
234
+ 2He4 + energy
91Pa
234
+ 2He4 + energy
90Th
230
+ 2He4 + energy
90Th
234
+ 2He4 + energy
92U
c.
d.
5.4MeV
6.4MeV
When an object is placed 15 cm from a concave mirror, a real image three times as
large as the object is formed. What is the focal length of the mirror in centimeters?
a. 45.0 cm
b. 22.5 cm
9.




How much energy is released when Uranium-232 (mass = 232.037u) decays to
Thorium-228 (mass = 228.0287u) with the emission of an alpha particle or a helium
nuclei (mass = 4.0039u)? (1u = 931.4 MeV)
a.
b.
8.
238
92Y
238
92Y
238
92U
238
92U
c.
d.
11.25 cm
5.0 cm
An atomic nuclide of 86R222 gave off an alpha particle forming a new nuclide X. A
second alpha particle was given off by X forming another new nuclide Y. Which is
the complete symbol for Y?
a.
b.
218
84Y
214
82Y
c.
d.
214
80Y
218
86Y
10. Five grams each of the radioactive samples A, B, C, and D were kept separately in a
drawer at the same time. Suppose the half life of A is two days, that of B is 4 days, C
is 6 days and D is 8 days. Which samples has the least amount remaining after 4
days?
a.
b.
A
B
c.
d.
C
D
11. After a storm, a rainbow appears in the sky. Which statement explains the
observation?
a. The white clouds are actually prism composed of different colors.
b. When sunlight is reflected by the ground towards the clouds, it separates into
different colors.
c. Raindrops act as prisms separating sunlight into colors.
d. The colors of the rainbow come from raindrops in the atmosphere.
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12. A light ray travels from air to water as shown. Which of the rays is the refracted ray?
air
water
d.
a.
c.
b.
13. A mirror and three letters are arranged as shown. Which of the letter(s) will be seen
by the observer at the position shown?
X
Y
Z
observer
mirror
a.
b.
X
Y
only
only
c.
d.
Z only
X, Y, and Z
39
Units III & IV
(Second Grading)
Conceptual Understanding
14. A step-down transformer is designed to work in a 12 V lamp from a 220 V supply. If
the primary coil has 900 turns, what is the number of turns in the secondary coil?
a.
b.
49
50
c.
d.
98
99
15. What is the combined resistance of a 20 ohm and a 40 ohm resistance connected in
parallel?
a.
b.
1.0 ohm
6.0 ohm
c.
d.
13.0 ohm
60.0 ohms
16. A wire with a diameter of 0.40 mm has a resistance of 0.5 ohms. What is the
resistance of a wire of the same material but of 0.6 mm diameter?
a.
b.
17.
0.115 ohm
0.22 ohm
c.
d.
1.125 ohms
1.225 ohms
How much electrical energy is used up in 2 hours by a 220 V electric stove whose
power rating is 3 kW?
a. 3 kWh
b. 6 kWh
c.
d.
440 kWh
660 kWh
18. What is the total amount of electrical energy consumed by three 100W lamps and
five 50W lamps if these are used for 30 days at an average of five hours daily?
a.
b.
0.825 kWh
8.25 kWh
c.
d.
82.5 kWh
825.0 kWh
19. About how much current in Amperes is in the filament of a 100 W lamp connected
to a 220 V line?
a.
b.
0.45 A
2.2 A
c.
d.
4.5 A
22.0 A
40
20. An electric meter showed an increase in reading of 8 kWh after a flat iron was used.
About how many hours was it used if it carried a 5 A current from a 220 V line?
a.
b.
1
4
c.
d.
7
40
21. Fifty identical Christmas lights are connected in series and plugged into a 220V line.
Neglecting wire resistance, what is the voltage across each bulb?
a.
b.
2.2V
4.4V
c.
d.
110V
220V
22. Which of the following correctly ranks the equivalent resistance of the three 100
resistors arranged as shown below from greatest to least value?
1.
2.
a.
b.
2-1-4-3
2-3-1-4
3.
4.
c.
d.
2-3-4-1
2-4-1-3
23. A magnet moved into a coil of wire will induce voltage in the coil. What is the effect
of moving the magnet into a coil with more loops?
a.
b.
c.
d.
lesser induced voltage
greater induced voltage
disappearance of the induced voltage
none of the above
24. Which statement does not apply to electric motors?
a.
b.
c.
d.
A magnetic field exerts a force on a current carrying conductor.
When there is current in a coil of wire inside a U-shaped magnet, a force is
exerted on the coil.
If the magnetic field around the coil of wire changes, an electric current is
produced in the coil.
A coil with current will rotate if placed in a magnetic field.
41
25. Which determine(s) the direction of the force on a current-carrying wire in a
magnetic field?
A. direction of current in the wire
B. amount of current in the wire
C. direction of magnetic field
a.
b.
A and B only
A and C only
c.
d.
B and C only
A, B, and C
Reasoning and Analysis
26. Which event is explained in the sequence of energy changes shown in the diagram
below?
Chemical Energy
Heat Energy
a. a turbine rotates
b. a flashlight is on
27. A student placed a compass under
a wire connected to a source of
electric current. Before the switch
was on, the compass pointed North.
After the switch was put on, the
compass moved as shown in the
diagram.
What
does
the
observation suggest?
a.
b.
c.
d.
c.
d.
Mechanical Energy
(with wasted heat)
gasoline burns to power a car
electric current runs a refrigerator
N
compass
The compass needle conducted electricity.
The wire became magnetic and affected the needle.
The compass needle lost its magnetism because of the current.
Electric current produced magnetic field which affected the needle.
42
28. The table below shows the current (A) in a circuit for several values of voltage (V).
Voltage (V)
2
3
4
Current (A)
4.50
6.75
9.00
Which statement is true?
a.
b.
c.
d.
Current
Current
Current
Current
is directly proportional to voltage.
is indirectly related to voltage.
is inversely related to voltage.
is inversely proportional to voltage.
29. The diagram on the
right shows situations
where electric current is
induced in the coil as
shown by the deflection
of the galvanometer.
galvanometer
bar magnet
coil of wire
galvanometer
What induces the current in the coil?
bar magnet
a.
b.
c.
d.
motion of the magnet
magnetic field of the magnet
motion of the coil and magnet
increasing/decreasing
magnetic field near/around the coil
coil of wire
galvanometer
bar magnet
coil of wire
30. A 220V electrical appliance is connected to a 220 V line. If the appliance is
transferred to a 110 V line, what happens to the current through it?
1
a. It remains the same.
c. It is reduced to .
2
b. It is doubled.
d. It is increased to 4 times.
43
31. For the same length of time, how much heat is produced in an electric stove if the
current is increased three times?
a.
b.
one third
twice as much
c.
d.
three times as much
nine times as much
32. Jose placed newly hatched chicks in a closed bamboo pen. Which lamp is better to
use inside the pen and why?
a.
b.
c.
d.
A fluorescent lamp because it is cheaper to use.
An incandescent lamp because it gives off more heat.
A fluorescent lamp because it glows brighter, thus giving off more heat.
An incandescent lamp because it does not glow bright enough to disturb the
chicks.
33. In a hydroelectric power station, which energy transformation takes place?
a.
b.
c.
d.
heat
mechanical energy
electrical energy.
gravitational potential energy
kinetic energy
electrical energy
electrical energy
mechanical energy
electrical energy.
nuclear energy
heat
electrical energy
44
Unit V
(Third Grading)
Conceptual Understanding
34. A man walks 8 km due North and 5 km due East and then 4 km due North. How far
is the man from the starting point?
a.
b.
12 km
13 km
c.
d.
17 km
169 km
35. What will be the speed of a car that accelerates from rest at 2m/s for 10 seconds?
a.
b.
0.2 m/s
5.0 m/s
c.
d.
20 m/s
40 m/s
36. If the density of wood is 0.5 g/cm3, what is the mass of 40 cm3 wood?
a.
b.
20 g
40 g
c.
d.
45 g
80 g
37. A girl whose weight is 490 N runs up a flight of stairs 10 m high. What is the work
done by her?
a.
b.
49 J
490 J
c.
d.
4 900 J
49 000 J
38. What is the pressure due to the sea water with a density of 1030 kg/m3 at a depth of
10 m in an ocean?
a.
b.
103 Pa
1030 Pa
c.
d.
10 300 Pa
103 000 Pa
39. A man is whirling a 0.2 kg ball overhead with a 0.3 m radius at a velocity of 2 m/s.
Find the centripetal force acting on the ball.
a. 0.12 N
b. 2.5 N
c.
d.
2.67 N
26.67 N
40. What is the momentum of a 1200 kg jeepney moving at a velocity of 20 m/s?
a.
b.
12 000 kg.m/s
20 000 kg.m/s
c.
d.
24 000 kg.m/s
36 000 kg.m/s
45
41. A 2 kg mass has 40 J of potential energy with respect to the ground. Approximately
how far is it located above the ground?
a.
b.
1m
2m
c.
d.
3m
4m
42. Which has greater kinetic energy, a car traveling at 30 km/hr or a car of half the
mass traveling at 60 km/hr?
a.
b.
the 30 km/hr car
the 60 km/hr car
c.
d.
both have the same kinetic energy
none of the above
43. The diameter of the small piston of a hydraulic press is 12 cm and the diameter of
the large piston is 48 cm. A force of 50 N is applied on the smaller piston. Determine
the force exerted on the large poison.
a. 800 N
b. 600 N
c.
d.
400 N
200 N
44. A big stone weighs 200 N in air. When immersed in water it weighs only 120 N.
What is the buoyant force of the water on the stone?
a.
80 N
c.
b.
320 N
d.
1.66 N
5
N
3
Reasoning and Analysis
45. The table below shows the values of Young’s Modulus of elasticity, a measure of the
stretchability or compressibility of a material within its elastic limit, for selected
construction materials labeled R, P, Q. Which one would be most durable if used
to build a bridge?
N
Y  2 
M 
0.95
9.10
20.0
Material
R
P
Q
a.
b.
R
P
c.
d.
Q
P and R
46
46. What would happen if the planet Earth suddenly disappears before a freely falling
body could hit its surface?
a.
b.
c.
d.
The body will stop moving.
The body will continue to move with a constant speed.
The body will continue to move at constant acceleration.
The body will continue to move at constant velocity.
47. A woman exerts a constant horizontal force on a large box. As a result, the box
moves across a horizontal floor at a constant speed. What can you say about the
force applied?
a.
b.
c.
d.
It has the same magnitude as the weight of the box.
It is greater than the weight of the box.
It has the same magnitude as the total force that resists the motion of the box.
It is greater than the total force that resists the motion of the box.
48. Two 1kg boxes are 1 m apart. If one of the boxes was changed into a 2 kg box, what
would happen to the force between the boxes?
a. quarted
b. halved
c.
d.
doubled
quadrupled
49. A delivery boy is holding a box on an elevator going down. Unfortunately, the cable
of the elevator snapped, and the elevator falls freely to the ground. If the delivery
boy throws the box upward, what will be the motion of the box with respect to the
elevator? The box will
a.
b.
c.
d.
rise to the ceiling of the elevator and will remain there.
not rise at all, but fall to the floor of the elevator at constant speed.
remain fixed where the delivery boy throws it.
rise, bounce off the ceiling and fall to the floor with increasing speed.
47
50. The table below shows the Kinetic Energy (KE) and the Potential Energy (PE) of a
1kg object dropped from a height of 180 meters above the ground.
Time
(s)
0
1
2
3
4
5
Vertical
Distance
Traveled (m)
0
5
20
45
80
125
Height from the
ground (m)
PE (J)
Speed
(m/s)
KE (J)
PE + KE
(J)
180
175
160
135
100
55
1800
1750
1600
1350
1000
550
0
10
20
30
40
50
0
50
200
450
800
1250
1800
1800
1800
1800
1800
1800
What is the best generalization that can be stated based on the data?
a.
b.
c.
d.
KE is always equal to PE at any point of the object’s fall.
The values of KE and PE remain constant.
The sum of KE and PE remains constant.
KE decreases with PE.
51. What becomes of kinetic energy when the speed of the car is doubled?
a.
b.
the same
two times as great
c.
d.
three times as great
four times as great
Refer to the following situations to answer Numbers 52-53.
A. a car moving at 75 km/h north
B. a ball dropped from a given height
C. a jeepney moving at 30 km/h around a circle route
52. Which of the following object/s is/are changing in speed?
a.
b.
A only
B only
c.
d.
B and C only
A and C only
53. Which of the above object/s is/are changing in velocity?
a.
b.
A only
B only
c.
d.
B and C only
A and C only
54. Which of the above object/s is/are accelerating?
a.
b.
A only
B only
c.
d.
B and C only
A and C only
48
Unit VI
(Fourth Grading)
Conceptual Understanding
55. How fast is a wave moving if its wavelength is 10 meters and its frequency is 110
Hertz?
a.
b.
11 m/s
100 m/s
c.
d.
120 m/s
1100 m/s
56. A transverse wave of frequency 400 waves/sec travels along a string at a constant
speed of 100 m/s. What is the wavelength of the wave?
a.
b.
1
m
400
1
m
5
c.
1
m
4
d.
4m
57. Determine the value of the resistance of the given resistor using its color code.
Brown
Black
Green
Gold
a.
b.
10 + 10%
1 M + 5%
c.
d.
10 M+ 5%
100 M + 100%
58. A set of chimes was made by cutting
four pieces of pipes of different
lengths from a long metal pipe and
hanging them as shown in the
drawing. Which pipe gave the lowest
note when struck with a hammer?
Z
a.
b.
c.
d.
W
X
Y
Z.
Y
X
W
49
59. A sonar signal at high frequency sent vertically downwards from a ship is reflected
from the ocean floor and is detected 0.45 s after transmission. If the speed of sound
in water is 1500 m/s, what is the depth of the ocean?
a.
b.
3375 m
337.5 m
c.
d.
3.375 m
.3375 m
60. Find the equivalent capacitance of the combination of capacitors shown below.
Assume C1 = 12 F, C2 = 6 F and C3 = 9 F.
C1
C2
V
C3
a.
b.
3 F
6 F
c.
d.
9 F
18 F
61. Which properties of light produced by a laser device distinguish it from ordinary
light?
1. monochromatic
2. polychromatic
3. coherent
4. incoherent
5. highly collimated
6. lowly collimated
a.
b.
1-4-6
1-3-5
c.
d.
2-4-5
2-3-6
62. A strong wind could make a tall tower sway back and forth at a frequency of 0.1 Hz.
What is the period of vibration of a swaying tower assuming it sways at the
frequency of 0.1 Hz.
a.
b.
0.1 second
1.0 second
c.
d.
10 seconds
100 seconds
50
For questions 63 - 64, refer to the figures below.
Figure A
Figure B
Figure C
Figure D
63. Which circuit diagram is equivalent to an AND Gate?
a.
b.
Figure A
Figure B
c.
d.
Figure C
Figure D
64. Which circuit diagram is equivalent to an OR Gate?
a.
b.
Figure A
Figure B
c.
d.
Figure C
Figure D
Reasoning and Analysis
65. The electric capacitance of a pair of parallel plates depends on its dimensions. For a
capacitor of fixed value, two parallel plates have a capacitance given by the equation
A
C  E , where A is the surface area of one plate, d is the separation between plates
d
and E is the permitivity constant of the space. What effect will increasing the
separation between the plates to twice its value have on C?
a.
b.
increase two times
decrease to one half
c.
d.
increase four times
decrease to one fourth
51
66. The crews of two boats at sea can communicate with each other by shouting. Why is
it impossible for the crews of two spaceships at similar distance apart in space to do
this?
a.
b.
c.
d.
The sound is reflected more in space.
The pressure is too high inside the spaceships.
The spaceships are traveling faster.
There is no air in space for the sound to travel through.
67. The diagram on the right shows Hertz’s
experimental setup consisting of two circuits.
The first circuit (Circuit 1) had a small gap
(A). When high voltage had built up in the
gap, sparks jumped back and forth across the
gap. The second circuit (Circuit II) consisted
of a conductor bent into a circle with a small
gap (B). When sparks were produced at A,
sparks were also produced at B. What did this
experiment show?
High
V
A
Circuit I
a.
a.
b.
d.
B
Circuit II
Electromagnetic (EM) waves exist.
EM waves can travel through space.
EM waves can be transmitted and received.
All of the above.
52