Question 1

When you are riding in a car then the driver suddenly steps on the gas pedal, why do you feel a jolt and push back?

Accepted Answer

multiplem://The pushback is caused by the inertia of your body that experiences an applied force from the car.|2: It is caused by inertia which states that the body at rest will remain at rest unless an external force is applied.|4: The applied force of the car disturbs the inertia of the body at rest regardless of the mass. The greater the mass of the person, the greater the inertia.|3

The sudden step of the driver on the gas pedal maintains the forces acting on your body.

Answer

The sudden step of the driver on the gas pedal maintains the forces acting on your body.

Question 2

Study the picture below. Why does the action and reaction forcesfrom nail and hammer do not cancel out?

Accepted Answer

multiplem://The direction of the forces is opposite from each other.|2: Since the external forces act on different objects therefore the magnitude equals tozero.|4:Thehammer and the nails are interacting, and they follow action-reaction withequal magnitude of forces.|3

Answer

Both the hammer and the nail receive unbalanced forces exerted byeach other.

Question 3

Solve for the potential energy of a 2kg suitcase that is raisedfrom 2m above the ground. (Hint: PE=mgh; where g=9.8 m/s2)

Accepted Answer

multiplem:// 39.20 is the resulting product following the formula PE=mgh.|2: 39.20 joules is the stored energy of the object due to the virtue of gravity.|4: 39.20 is the computed product and joule as the unit upon calculating the potential energy.|3

Answer

39.20 kgm/s² is the potential energy of the 2kg suitcase that is raised in 2m.

Question 4

Why do most concerts perform at night?

Accepted Answer

multiplem://The sound waves refracted downward and travel slowly at night.|3:The sound waves travel faster in daytime compared to nighttime.|2:The sound waves spread widely on the lower areas due to colder temperature.|4

Answer

The propagation of sound during nighttime is faster.

Question 5

In the color spectrum, thewavelength is inversely proportional to frequency. What is the relationship ofthe hierarchy of colors to its corresponding energy?

Accepted Answer

multiplem://Red has lower frequency than violet.|2: Red has lower frequency therefore it has lower energy.|4:Red has lower energy but with longer wavelength as compared to violet.|3

Answer

Red has shorter wave length than violet.

Question 6

How would you describe thetype of fault as illustrated in the diagram below?

Accepted Answer

multiplem://It has a resulting obtuse angle on the surface after the movement.|2:The hanging wall slides down relative to the footwall due to the sudden release of energy.|4: It is considered normal fault wherein one side of the fault moves downward with respect to the other side.|3

Answer

The illustration shows the compressional type of stress that occurred in the inner layers of the earth.

Question 7

Marikina City is alongthe West Valley Fault which is classified as an active fault. If there is amagnitude 5 earthquake, what would be its impact on humans and their properties?

Accepted Answer

multiplem:// Heavy objects and furniture overturn and topple.|2: Most people are frightened due to the strong vibrations of the ground.|4: Many people feel dizzy and may find it difficult to stand on the upper floors.|3

Answer

Buildings may collapse due to strong intensity of the earthquake.

Question 8

How is wind speed used to classify tropical cyclones?

Accepted Answer

multiplem://The classification of tropical cyclones depends on its sustained wind speed.|2:To be able to develop as a tropical cyclone, it must sustain the wind speed and requires a continuous flow of warm moist air.|3: If warm moist air flows into a preexisting atmospheric disturbance, further development occurs, and it will be classified as the next category which is more destructive.|4

Answer

When winds sustain its speed up to 61 kilometers per hour, it causes heavy rainfall in the inland and classifies it as typhoon.

Question 9

Which infer the illustration below?

Accepted Answer

multiplem://The typhoon Ompong enters the Philippine Area of Responsibility on September 13, 2018 at 8AM.|2:On September 16, 2018 typhoon Ompong is already outside the PAR because it is located 19.8°N, 115.7°E.|3:Typhoon Ompong enters the PAR at 8 AM on September 13, 2018, stays for three days, and moves in westward direction.|3

Answer

The typhoon Ompong lasts from September 13 to 15, 2018 but did not affect much the country because it traversed the uppermost part of Luzon.

Question 10

Which characteristic is common among comets, meteoroids, and asteroids?

Accepted Answer

multiplem://They come in varied sizes, shapes, and compositions.|1: They vary in size and the meteoroids are the smallest.|2:They are not usually seen in the sky because they do not follow a specific orbit.|3

Answer

They have the same chemical composition because comets and meteoroids are remnants of asteroids.

Question 11

Which is TRUE about the forces of attraction between the particles of the three states of matter?

Accepted Answer

multiplem://Solid has very strong interparticle forces of attraction.|1: Gas has very weak interparticle forces of attraction thus it can be compressed.|3: Among the three states of matter, solid has compact particles with very strong forces of attraction.|2

Answer

Same as solid, liquid has very strong interparticle forces of attraction.

Question 12

A small amount of salt was poured into water and stirred thoroughly to mix it evenly in water. How do you classify the resulting liquid?

Accepted Answer

multiplem://It is a mixture of salt as solute and water as solvent.|1: The resulting liquid is a compound due to the mixture of NaCl andH₂O.|2:It is a homogeneous mixture because its composition is even all throughout and distributed uniformly.|3

Answer

The resulting liquid is considered as a pure substance.

Question 13

How do you describe the phase change as shown by the arrangement of the particles as illustrated below?

Accepted Answer

multiplem://Melting process takes place when solid turns into liquid.|2: Physical change occurs to solid when its particles absorb heat.|3: Asthe melting process takes place, the inter molecular spaces become greater thus the forces of attraction between the particles become weaker.

Answer

Liquid particles show greater intermolecular energy than solid.

Question 14

What phase change can be inferred in the water cycle as shown by the illustration below?

Accepted Answer

multiplem://Water from the surface of the ocean evaporates due to increase in temperature.|2: If the air is saturated and the radiated heat is enough, it precipitates forming water droplets and falls on the ground as rain.|4: Water from different bodies changes into vapor, condenses to form clouds and precipitate back to the earth surface in the form of rain.|3

Answer

When the water vapor reaches the upper part of the troposphere, it forms water droplets forming rain.

Question 15

Which BEST shows the process of chemical change?

Accepted Answer

multiplem://Rusting of iron due to exposure to oxygen.|3: Adding calamansi juice to evaporated milk.|1:Ripening of fruit results in a sweet taste and change in color.|2

Answer

Adding sugar and milk to hot water.

Question 16

Which statement BEST describes an atom and molecule?

Accepted Answer

multiplem://Atoms are much smaller compared to molecules.|1: Atom is the smallest unit of element while molecule is the smallest unit of compound.|2:Atoms are the smallest unit of elements which are made up of sub- atomic particles therefore combinations of atoms formed molecules of a compound.|3

Answer

Atoms are made up of neutral particles while molecules are made up of two or more particles that are independent from each other.

Question 17

A Carbon atom is illustrated below. Describe the atom.

Accepted Answer

multiplem://Carbon atoms have 6 positively charged particles.|2: Carbon atom is neutral because the number of protons and neutrons are the same.|4: Carbon atom has12 atomic masses with the same number of protons, electrons, and neutrons.|3

Answer

Carbon atoms have 12 negatively charged particles.

Question 18

Which best describes fluorine as anion based on the illustration?

Accepted Answer

multiplem://Fluorine atom has 9 neutral charged particles.|2: Fluorine anion has negative charged of 1 and formed 10 electrons.|3: Fluorine considered as anion since it has an atomic mass of 19, atomic number of 9, and has negative charge of 1.|4

Answer

Fluorine has 9 protons which is equal to its number of electrons.

Question 19

Write the electron configuration of Boron (B₅) and determine its position in the periodic table based on the given options below.

Accepted Answer

multiplem:// Boron has an ending electron configuration of 2p¹.|1: Boron has 5 atomic number with electron configuration of 2p¹.|2: Boron belongs to the p block because its electrons configuration ends to 2p¹|3

Answer

Boron is classified under period 1 due to its 1 valence electron.

Question 20

Atomic radius is based on the size of its atom. The trend of atomic radii is decreasing across a period and increasing down a group. By looking at the given diagram infer why potassium has a larger radius than aluminum?

Accepted Answer

multiplem:// Based on its atomic number, Potassium is higher than aluminum.|2:Potassium belongs to Group 1 while aluminum belongs to Group 13.|3: Since potassium has greater atomic number than aluminum therefore it has a greater radius.|4

Answer

Potassium can be found under period 1 while aluminum is in period 5.

Question 21

Which of the following shows how digestive organs work together to perform other functions?

Accepted Answer

multiplem:// Undigested food should be excreted regularly to avoid septic poisoning.|3: Glucose as a product of digesting carbohydrates is used to produce energy.|1: Digestion products may not only give us energy but are used to facilitate other life processes.|2

Answer

The nutrients absorbed by the villi are stored in the small intestine for further digestion.

Question 22

In the cell cycle, how do you describe the events when producing new body cells?

Accepted Answer

multiolem:// The interphase is the resting phase because the cell prepares for DNA replication, growth and cell division.|3: In the G₁ phase, the cell is metabolically active preparing the materials for continuous growth of the cell.|1:Duringthe G₂ phase, macromolecules are required for replication of cell organelles and increase the number of cytoplasm.|2

Answer

In the Synthesis phase, replication of the genetic materials and organelles takes place.

Question 23

How does spermatogenesis differ from oogenesis?

Accepted Answer

multiplem://Spermatogenesis produces sperm cells in the testes while oogenesis produces egg cells in the ovary.|2: The spermatids formed inspermatogenesis are motile while the ovum produced in oogenesis are non-motile.|2:Gamete formation inspermatogenesis is continuous while once a month formation happens in oogenesis due to menstrual cycle.|3

Answer

Few of gametes are produced in spermatogenesis while hundreds of mature gametes are formed in oogenesis.

Question 24

Assume that tall (T) is dominant over short (t). If a heterozygous tall pea plant is crossed with another heterozygous pea plant, what are the possible outcomes of this cross?

Accepted Answer

multiplem:// The phenotypic ratio of the crossed of both heterozygous tall parents is 3:1|2:The genotype of the offspring is one homozygous tall, two heterozygous tall, and one homozygous short.|2:The phenotype of the offspring is tall and zero chance for short based from the crossed of heterozygous parents.|3

Answer

Since both parents are heterozygous therefore, the probability of the crossed is 75% tall and 25% short.

Question 25

Which infer the arrangement of the taxonomic classification system based on the diagram below?

Accepted Answer

multiplem://Taxonomic classification system is arranged according to the broadest to specific level.|2: Kingdom is the highest level and the most complex among the hierarchical taxonomic system.|3:Organisms may belong to the same kingdom but different orders since they have different characteristics.|4

Answer

Sub-species is the highest level among the hierarchical taxonomic system of organisms.

Question 26

Which statement shows the impact of high biodiversity in an ecosystem?

Accepted Answer

multiplem://High biodiversity helps organisms to adapt to their environment.|1:The higher the biodiversity the more productive and stable the ecosystem is.|3:High biodiversity makes an ecosystem more sustainable and contribute to ecological balance.|2

Answer

High biodiversity inhibits the flow of energy in the ecosystem.

Question 27

Looking at the diagram, which BEST describes the transfer of energy from one trophic level to another?

Accepted Answer

multiplem://Only ten percent of energy of phytoplankton are transferred to zooplanktons.|2: Since humans are at the top of the energy level, therefore, it obtained the least amount of energy.|4: Small fish occupied the 3^rdtrophic level and obtained only one percent of energy from zooplankton.|3

Answer

One-hundred percent of energy is absorbed by the consumers from the sun.

Question 28

Which explains the importance of bacteria in the cycling of nitrogen in the ecosystem?

Accepted Answer

multiplem:// Special bacteria convert the nitrogen gas to ammonia which plants can use.|2:Denitrifying bacteria convert the simple nitrogen compounds back to nitrogen gas.|1: Nitrifying bacteria convert ammonia into nitrite ions so that plants can absorb it as nutrients.|3

Answer

Bacteria play a key role infixing nitrogen into nitrate and releasing carbondioxide back to the atmosphere.

Question 29

Below is a picture showing a destroyed environment. How do people contribute to this problem?

Accepted Answer

multiplem://Many trees are cut down illegally for the production of lumber.|2:They cut down trees for production of charcoal for household fuels and industrial purposes.|3:Forests are now converted to farmland because some farmers do not have their own land for planting.|4

Answer

Residents near the area dotree planting and growing to parts of forests where slash and burn activitieswere performed.

Question 30

Which statements would best describe the impact of bottom trawling fishing technique in marine habitat?

Accepted Answer

multiplem://The natural seafloor habitat for many marine organisms are disrupted by trawling for a long time.|1:Scraping and ploughing of the sea-floor displace large volumes of sediments thus affecting the quality of water.|3:During trawling, all underwater sea creatures lying in its path cannot escape and they are scooped up.|2

Answer

Bottom trawling is a method of fishing that involves dragging lightweight nets across the sea floor.

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