Republic of the Philippines
Department of Education
National Capital Region
SCHOOLS DIVISION OFFICE OF QUEZON CITY
2024 – 2025
JUSTICE CECILIA MUÑOZSY
PALMA
SENIOR HIGH SCHOOL
NAME: Paseo del Carmen St., AMLAC Ville SubdivisionDate:
Payatas B Quezon City
Section:
Score:
MIDTERM EXAMINATION
PHYSICAL SCIENCE – GRADE 11 & 12
SY 2024-2025
Directions: Read each question carefully and choose the BEST answer. Write the
LETTER of your choice on a separate sheet of paper or provided answer sheet.
1. What is the term referred to as the process that creates new atomic nucleus
from preexisting nucleons, primarily protons and neutrons?
A. Nuclear fusion
C. Nuclear reaction
B. Nucleosynthesis
D. Nuclear Synthesis
2. What is the term referred to by which light nuclei fuse together to form heavier nucleus?
A. Nuclear fusion
C. Nuclear reaction
B. Nucleosynthesis
D. Nuclear synthesis
3. What was formed as the universe expanded and cooled down?
A. proton
B. neutron
C. electron
D.subatomic particles
4. What is formed when there is a fusion of two deuterium nuclei in big bang
nucleosynthesis?
A. neutron
C. Helium-3
B. Hydrogen
D. one neutron and Helium-3
5. What are the conditions in the universe so that a nuclear fusion could occur?
A. high energy
C. moderate conditions
B. high temperature
D. high energy and high temperature
6. What is formed when there is a fusion of deuterium and tritium?
A. Helium-2
C. Helium-4
B. Helium-3
D. Helium-2 and neutron
7. What is the term referred to as an element that has the same atomic number of the
original element but with different atomic mass or mass number:
A. tritium
C. Helium-3
B. deuterium
D. Helim-4
8. Which element will be produced from the nuclear fusion of helium-3 and Helium-4?
A. tritium
C. Lithium-7
n
n
n
B. deuterium
D. Beryllium-7
p
p
+
p
?
p
9. Which of the following nuclei collided and reacted with Helium-4 to produce Lithium-7
and a photon?
n
n
A. tritium
C. Helium-3
n
n
p
+ photon
p
B. deuterium
D. Helim-4
n
p
p
+ ?
p
n
10. Which particle would result in the collision and reaction between two deuterium nuclei?
A. proton
C. photon
n
n
n
B. neutron
D. electron
p
+
p
p
p
+ ?
11. What is the primary product of CNO cycle in stellar nucleosynthesis?
A. Carbon
C. Oxygen
B. Helium
D. Hydrogen
12. Why is the process of hydrogen fusion in stars referred to as “chain reaction”?
A. because it only occurs in a single step
B. because it requires external energy to continue
C. because it’s a random process without a defined sequence
D. because the products of one reaction initiate further reactions
13. In the context of stellar nucleosynthesis, what does the term “triple alpha process”
refer to?
A. the fusion of carbon nuclei to form oxygen
B. the fusion of nitrogen nuclei to form helium
C. the fusion of three helium nuclei to form carbon
D. the fusion of three hydrogen nuclei to form helium
14. What is the role of carbon, nitrogen, and oxygen in the CNO cycle?
A. They inhibit fusion reactions
B. They act as catalysts for hydrogen fusion
C. They are the primary products of the cycle
D. They are consumed during the fusion process
15. How many protons are used to produce one helium nucleus in stellar
nucleosynthesis?
A. two
B. three
C. four
D. five
16. What is the significance of the triple alpha process in stellar
nucleosynthesis?
A. It converts carbon into oxygen
B. It produces hydrogen from helium
C. It allows the fusion of helium into carbon
D. It is a process that occurs in supernovae
17. In which stage in stellar evolution does star spend most of its life where Hydrogen
fuses into Helium at a temperature of millions of degrees?
A. protostar
C. supernova
B. main sequence star
D. red giant/ red super giant
18. What is the term referred to when a massive star runs out of fuel, and it cools
causing pressure to drop then gravity wins out and the star collapses?
A. protostar
C. supernova
B. main sequence star
D. red giant/ red super giant
19. What is the term referred to by a cosmic body of extremely intense gravity from
which nothing, not even light, can escape. It can be formed by the death of
a massive star.
A. white dwarf
C. black hole
B. neutron star
D. red giant/ red super giant
20. In which stage of stellar evolution does star used up its hydrogen supply in the
core and switched up to thermonuclear fusion?
A. protostar
C. black hole
B. neutron star
D. red giant/ red super giant
21. Which of the following sequences below correctly describes the evolution of
the Sun from young to old??
A. White dwarf, red giant, main-sequence, protostar
B. Red giant, main-sequence, white dwarf, protostar
C. Protostar, main-sequence, white dwarf, red giant
D. Protostar, main-sequence, red giant, white dwarf
22. Why do stars like the Sun probably do not form iron cores during their evolution?
A. all the iron is ejected when they become planetary nebulas.
B. the iron they make by nucleosynthesis is all fused into uranium.
C. their strong magnetic fields keep their iron in their atmospheres.
D. their cores never get hot enough for them to make iron by nucleosynthesis.
23. What happens to the core of a star like the Sun as it evolves into a red giant?
A. it turns into iron
C. it contracts and heats
B. it expands and cools
D. it expands and heats
24. Protostars initially do not experience hydrogen fusion. How then do they heat up?
A. fusion of hydrogen into helium
C. Energy from their magnetic fields.
B. Energy from their magnetic fields D. Gravitational energy from infalling material.
25. Why can high-mass stars "burn" helium more easily than low-mass stars?
A. all the iron is ejected when they become planetary nebulas.
B. the iron they make by nucleosynthesis is all fused into uranium.
C. their strong magnetic fields keep their iron in their atmospheres.
D. their cores never get hot enough for them to make iron by nucleosynthesis
26. When do stars enter the main sequence?
A. as soon as it forms planets
B. it collapses, and its envelope becomes degenerate
C. it stops fusing hydrogen in its core and starts to expand
D. nuclear fuel in its core can supply enough energy to stop its collapse
27. When do stars leave the main sequence?
A. as soon as it forms planets
B. it collapses, and its envelope becomes degenerate
C. it stops fusing hydrogen in its core and starts to expand
D. nuclear fuel in its core can supply enough energy to stop its collapse
28. Why can high-mass stars "burn" helium more easily than low-mass stars?
A. High-mass stars are already burning helium on the main sequence.
B. Low-mass stars have proportionately less helium than high-mass stars.
C. This statement is false. It is much harder for high-mass stars to burn helium.
D. high-mass star's core is already very hot, so it only needs to compress its core
a little to burn helium.
29. Why do low-mass stars like the Sun probably do not form iron cores during their
evolution?
A. because all the iron is ejected when they become planetary nebulas
B. because the iron they make by nucleosynthesis is all fused into uranium.
C. because their cores never get hot enough to make iron by nucleosynthesis
D. because their strong magnetic fields keep their iron in their atmospheres
30. What makes a high-mass star's core collapse?
A. Energy from its outer layers compresses its core.
B. The only thing that can make a star's core collapse is a collision with another
star.
C. Massive stars develop iron cores that cannot fuse anymore, so the core
collapses under gravity.
D. This statement is False. Massive stars' cores don't collapse; they expand and
become planetary nebulas.
31. What element will be formed when 207
82𝑃𝑏 is bombarded with a neutron?
207
A. 208
𝑃𝑏
B.
𝑃𝑏
C. 208
D. 208
82
82
81𝑇𝑒
81𝐵𝑖
16
19
4
32. Complete the following nuclear reaction: 8𝑂 + 2𝐻𝑒  ____ + 10
𝑁𝑒
1
2
A. p
C. H
B. 1n
D. 3H
235
141
92
33. In the fission reaction 92𝑈 + 1n  56𝐵𝑎 + 36
𝐾𝑟 + neutrons, how many neutrons are
produced?
A. 0
B. 1
C. 2
D. 3
34. Consider the diagram. Two neutrons and two protons combined to form an element
during element formation. Which of these statements best describes the element being
formed?
n
n
n
+
n
+
p
+
p
p
p
A. Helium with a proton number of 2 and mass number 2
B. Helium with a proton number of 2 and mass number 4
C. Hydrogen with a proton number of 2 and mass number 2
D. Hydrogen with a proton number of 2 and mass number 4
35. When carbon-14 undergoes beta decay (beta minus) it changes into Nitrogen.
Which of these is the correct representation of carbon-14 decay?
A. 146𝐶 + −10𝛽  145𝑁
C. 146𝐶  145𝑁 + −10𝛽
B. 146𝐶 + −10𝛽  147𝑁
D. 146𝐶  147𝑁 + −10𝛽
30
36. Bombardment of 27
13𝐴𝑙 with an alpha particle produces 15𝑃 and another particle.
Which of the following is the best representation for this?
30
30
0
4
1
4
A. 27
C. 27
13𝐴𝑙 + 2𝐻𝑒  15𝑃 + 0𝑛
13𝐴𝑙 + 2𝐻𝑒  15𝑃 + −1𝛽
30
30
0
4
1
4
B. 27
D. 27
13𝐴𝑙 + 2𝐻𝑒  15𝑃 + 1𝑝
13𝐴𝑙 + 2𝐻𝑒  15𝑃 + +1𝛽
37. Which of the following would be the nuclear equation when 238
92𝑈 absorbs a neutron to
239
𝑃𝑢 accompanied by the emission of a beta particle?
94
239
0
239
0
1
1
A. 238
C. 238
92𝑈 + 0𝑛  94𝑃𝑢 + −1𝛽
92𝑈 + 0𝑛  94𝑃𝑢 + 2 −1𝛽
239
0
239
0
1
1
B. 238
D. 238
92𝑈 + 0𝑛  94𝑃𝑢 + +1𝛽
92𝑈 + 0𝑛  94𝑃𝑢 + 2 +1𝛽
38. 238
92𝑈 is bombarded by alpha particles resulting in a new nucleus being formed and
form
two neutrons being ejected. What is the nucleus?
A. Thorium B. Plutonium
C. Neptunium
D. Protactinium
12
39. . 238
𝑈
is
bombarded
with
𝐶
to
produce
a
nuclide
and
how
many
protons?
92
6
A. 1
B. 3
C. 4
D. 5
40. 242
96𝐶𝑚 is bombarded with alpha particles, producing a nucleus and a neutron.
What is the formed nucleus?
A. Americium B. Berkelium
41.
C. Californium
D. Einsteinium
239
𝑃𝑢 is bombarded by alpha articles. A neutron and what else is produced?
94
A. Americium
B. Berkelium
C. Cesium
D. Neptunium
42. Metals tend to _____ electrons and nonmetals tend to ______ electrons.
A. gain, gain
C. lose, gain
B. lose, lose
D. gain, lose
43. Ionic bonds are normally formed when _____
A. electrons are shared between nonmetals
B. electrons are transferred from metal to nonmetal
C. electrons are transferred from nonmetal to metal
D. electrons are shared between a metal and a nonmetal
44. Covalent bonds are normally formed when _____
A. electrons are shared between nonmetals
B. electrons are transferred from metal to nonmetal
C. electrons are transferred from nonmetal to metal
D. electrons are shared between a metal and a nonmetal
45. Which of these compounds is classified as IONIC?
A. CO2 B. ZnCl2
C. SF2
D. SeBr2
46. Which of the following is the correct electron configuration of Argon?
A. 1s2 2s2 3p6 3s2 4p6
C. 1s2 2s2 2p6 3s2 4p6
B. 1s2 2s2 2p6 3s2 3p6
D. 1s2 2s2 2p6 3s2 3p7
47. Which of the following Lewis dot diagrams is correct?
A.
N
B. Be
C.
C
D.
O
48. Why is a water molecule (H2O) an example of a covalent bond?
A. They do not form a neutral group of atoms.
B. Hydrogen and oxygen are both negative ions.
C. Electrons are shared between the hydrogen and oxygen
D. The hydrogen gains an electron while the oxygen loses one.
49. What will occur when Calcium forms a bond?
A. Calcium will share its two valence electrons to form an ionic bond.
B. Calcium will share its two valence electrons to form a covalent bond
C. Calcium will give away its two valence electrons to form an ionic bond
D. Calcium will give away it two valence electrons to form a covalent bond.
50. How many electrons does chlorine need to gain to have a full outer shell?
A. 1
B. 3
C. 7
D. 8