1. The temperature at which a substance changes from the liquid phase to the gaseous phase is called as?
A. Evaporation
B. Condensation
C. Freezing
D. Deposition
Answer: A
Rationale: Evaporation is a
phase transition from the liquid phase to the gas phase that occurs at
temperatures below the boiling point at a given pressure. Condensation:
The process by which a gas cools and becomes liquid. Freezing: The
process of solidifying as a result of abstraction of heat Sublimation: A
change of phase from solid to gas.
2. Which of the following illustrates a
physical change?
A. Butter melts
B. Milk turns sour
C. Iron nail rusts
D. Fruits ripen
Answer: A
Rationale: A butter melting
on a hot day because it was left out on the counter, is an example of physical
change. Physical change is simply change in size, shape and phase without
changing the composition of the matter.
3. Of the state of matter, which has the
weakest intermolecular force of attraction?
A. Solid
B. Liquid
C. Gas
D. Both liquid and gas
Answer: C
Rationale: The gas is the
state in which matter expands to occupy the volume and shape of its container
and it has indefinite shape and indefinite volume. The motion of gas molecules
is completely free (unlimited) , the intermolecular spaces are very large and
the intermolecular forces are very weak or almost not existed .
4. Which of these is malleable?
A. Gold
B. Glass
C. Chalk
D. Rubber
Answer: A
Rationale: Gold is a
chemical element with the symbol Au (from Latin: aurum) and the atomic number
79. In its purest form, it is a bright, slightly reddish yellow, dense, soft,
malleable, and ductile metal. Malleability is the capability of metals to be
stretched or bent into different shapes.
5. When vapor condenses to a liquid, heat
is?
A. Released
B. Absorbed
C. Transformed
D. Increased
Answer: A
Rationale: Condensation is
the formation of liquid drops of water from water vapor. It is the process
which creates clouds, and so is necessary for rain and snow formation as well.
Condensation in the atmosphere usually
occurs as a parcel of rising air expands and cools to the point where some of
the water vapor molecules clump together faster than they are torn apart from
their thermal energy. A very important part of this process is the release of the
latent heat of condensation.
6. Which classification of matter consists
of two or more atoms?
A. Mixtures
B. Compounds
C. Elements
D. Solution
Answer: B
Rationale: In basic
chemistry, the simplest form of most matter is a compound. The definition of a
compound is two or more elements that are chemically combined. Since a molecule
contains two or more atoms, it is a compound.
7. Which of the following is mostly composed of ionic compounds?
A. Organic
B. Metals
C. Mixtures
D. Elements
Answer: B
Rationale: Those molecules
that consist of charged ions with opposite charges are called IONIC. These
ionic compounds are generally solids with high melting points and conduct
electrical current. Ionic compounds are generally formed from metal and
non-metal elements.
8. This refers to the space occupied by matter:
A. Mass
B. Solubility
C. Volume
D. Malleability
Answer: C
Rationale: The amount of
space an object occupies is its volume. Solubility is the amount of
substance that will dissolve in a given amount of another substance. Malleability
is the capability of metals to be stretched or bent into different shapes. Mass
is the property of a body that is a measure of its inertia and that is commonly
taken as a measure of the amount of material.
9. Hardness is one of the properties of
matter and is best described as:
A. Property of a solid to resist
compression.
B. Is the temperature at which substance
begins to change from solid to liquid.
C. Is the temperature at which a substance
begins to change from liquid to gas.
D. Ability of liquid to dissolve in
another liquid.
Answer: A
Rationale: Hardness is a
measure of how resistant solid matter is to various kinds of permanent shape
change when a compressive force is applied
10. Chemical change in matter usually happens
when:
A. The change in substance keeps its
chemical identity.
B. New substances are formed from the
original substance.
C. Nuclear composition of an atom
increases or decreases.
D. An atom has same atomic mass but
different atomic number.
Answer: B
Rationale: There are usually
one or more new substances formed or created from that change, You can tell
there is chemical change when it produces a gas, light, smell, fire (heat) or
color change
11. Phase of matter wherein particles have
great attraction to each other, has definite shape and volume:
A. Solid
B. Gas
C Liquid
D. Plasma
Answer: A
Rationale: Solids have
definite shapes and volumes because their atoms and molecules are held together
firmly by the strong inter-molecular forces.
12. Which of the following composition of atom surrounds the nucleus and has a negative charge?
A. Protons
B. Neutrons
C. Nucleus
D. Electrons
Answer: D
Rationale: Electrons have a
negative charge and are electrically attracted to the positively charged
protons. Neutrons are very small rock particles that has no electrical charge.
13. Refers to a break or crack in the Earth's
crust:
A. Epicenter
B. Fault
C. Fault line
D. Focus
Answer: B
Rationale: A crack in the
earth's crust is called a fault, Some faults cannot be seen by someone standing
on the Earth's surface. That is because these faults occur underneath surface,
but many faults do extend up to the surface, forming different kinds of cracks in
the Earth's outer crust.
14. When large masses of rock in the
Earth's crust deform and break, the sudden movement creates vibrations that
travel through the Earth and is felt as a/an:
A. Earthquake
B. Tornado
C. Tsunami
D. Landslide
Answer: A
Rationale: An earthquake is the
vibrations we feel when the earth's crust suddenly moves. Tornado is a
violent and destructive whirling wind accompanied by a funnel-shaped cloud that
progresses in a narrow path over the land. Tsunami is a great sea wave
produced especially by submarine earth movement or volcanic eruption. Landslide
is a usually rapid downward movement of a mass of rock.
15. Which of the following refers to the spot
directly above the focus of earthquake on the surface of the Earth?
A. Hypocenter
B. Epicenter
C. Fault
D. Fault line
Answer: B
Rationale: The surface
directly above where an earthquake starts is called the /epicenter, according
to the United States Geological Survey.
16. The place where the Earthquake starts
or the origin of an earthquake is termed as:
A. Epicenter
B. Fault
C. Fault line
D. Focus
Answer: D
Rationale: The location
below the earth's surface where the
earthquake
starts is called the hypocenter or focus
17. A scale that measures the magnitude of
an earthquake based on seismic waves and movements along a fault is known as;
A. Mercalli scale
B. Movement magnitude scale
C. Richter scale
D. Weighing scale
Answer: C
Rationale: Richter Scale
- an open-ended logarithmic scale for expressing the magnitude of a seismic
disturbance in terms of energy. Mercalli scale - a measure of earthquake
intensity. Movement magnitude scale - used by seismologists to measure
the size of earthquakes in terms of energy released.
18. What does seismograph record?
A. Location of the epicentre
B. Rating of the earthquake
C. Movement caused by seismic waves
D. Speed of seismic waves
Answer: C
Rationale: A seismograph, or seismometer, is an instrument used to
detect and record earthquakes. Generally, it consists of a mass attached to a
fixed base. During an earthquake, the base moves and the mass do not. The
motion of the base with respect to the mass is commonly transformed into an
electrical voltage.
19. Which of the following government
agencies is responsible for mapping the active faults and trenches in the
Philippines?
A. DENR
B. DPWH
C. PAGASA
D. PHIVOLCS
Answer: D
Rationale: The Philippine
Institute of Volcanology and Seismology- Department of Science and Technology
(PHIVOLCS¬DOST) is responsible for mapping the active faults and trenches in
the Philippines.
20. A sudden push from an underwater fault
can produce a wave called:
A. Hurricane
B. Thunderstorm
C. Tornado
D. Tsunami
Answer: D
Rationale: Tsunamis are
large waves caused by sudden movement of the ocean due to earthquakes,
landslides, large volcanic eruptions or meteorite impact in the ocean. Earthquake
- the vibrations we feel when the earth's crust suddenly moves. Tornado
is a violent and destructive whirling wind accompanied by a funnel-shaped cloud
that progresses in a narrow path over the land. Landslide-a usually
rapid downward movement of a mass of rock.
21. Tanny Cruz, a meteorologist announced
a tropical cyclone spotted North of Batanes with wind speed of 200 kph. What
kind of weather disturbance is expected to hit Batanes?
A. Tropical depression
B. Tropical storm
C. Typhoon
D. Super Typhoon
Answer: D
Rationale: PAGASA in its
typhoon classification now include a super typhoon category 4 or exceeds 200
kph. Tropical depression is a low pressure area with thunderstorm with
accompanying winds of 39 mph.
Tropical storm is a low pressure area with
thunderstorm with accompanying winds of 39 mph-73 mph. Typhoon is a tropical
storm formed in the Pacific Ocean.
22. What is the temperature of the bodies
of water in the vicinity of the Philippines?
A. Cold
B. Lukewarm
C. Moist
D. Warm
Answer: D
Rationale: The waters around
the Philippines are warm because the Philippines is in the tropical band of the
planet.
23. In which climate zone is the Philippines
found?
A. Arctic
B. Polar
C. Temperate
D. Tropical
Answer: D
Rationale: Climate of the
Philippines is either tropical rainforest, tropical savanna, tropical monsoon,
or humid subtropical (in higher-altitude areas) characterized by relatively
high temperature, oppressive humidity and plenty of rainfall.
24. Tropical storm:: formed in Atlantic
ocean:
A. Hurricane
B. Typhoon
C. Cyclone
D. Tornado
Answer: A
Rationale: Tropical storms
are low pressure area with accompanying winds of 39 mph-73 mph. Storms formed
at the Atlantic ocean is called hurricane.
25. To inform the people about the
approaching weather disturbance, the PAGASA sends out:
A. Emergency kit
B. Typhoon signal
C. Weatherman
D. Weather map
Answer: B
Rationale: Public Storm
Warning Signals are raised to warn the public of incoming weather disturbances.
Once a Storm Signal is raised, conditions are not yet necessarily felt in the
given area, The following are the lead times for issuing a Public Storm
Signal:
The weather disturbance is expected in 36
hours once Public Storm Warning Signal No. 1 is raised.
The weather disturbance is expected in 24
hours once Public Storm Warning Signal No. 2 is raised.
The weather disturbance is expected in 18
hours once Public Storm Warning Signal No. 3 is raised.
The weather disturbance is expected in 12
hours once Public Storm Warning Signal No. 4 is raised.
26. What is the highest rank of coal?
A. Lignite
B. Anthracite
C. Charcoal
D. Bituminous
Answer: B
Rationale: The rank of coal
from lowesto highest is lignite—sub-bituminous-bituminous-anthracite.
27. Why do typhoons weaken as they pass over land?
A. It no longer has warm, moist air to
draw energy from
B. It starts at a latitude closer to the
equator
C. The wind blows from different
directions
D. There is less water vapour in cool air
Answer: A
Rationale: When typhoons
move over land, they usually start to weaken quickly because they no longer
have their source of fuel.
28. Which of the following planets is known as the fastest orbiting planet in the solar system?
Mercury
Venus
Earth
Mars
Answer: A
Rationale: The fastest
moving planet in the solar system is Mercury. The planet whizzes around the sun
at an orbital velocity of 1.6 times that of earth's orbital velocity.
29. Which of the following is known as the largest gas planet?
A. Saturn
B. Neptune
C. Uranus
D. Jupiter
Answer: D
Rationale: Jupiter is the
largest planet in the solar system and the fifth planet from the sun.
30. A grade 8 science teacher is
discussing tension force. Which of the following statement describe this type
of force?
A. A force with which the earth, moon, and
other massively large objects attracts another object toward itself,
B. Force upon an object that is it contact
with another stable object.
C. A force transmitted through a string
when it is pulled tight.
D. A force that is also called as support
force.
Answer: C
Rationale: Tension force
describes the pulling force transmitted axially by means of a string, cable,
chain or similar one dimensional continuous object, or by each end of a rod,
truss member, or similar three dimensional objects; tension can also be
described as the action reaction pair of forces acting at each end of said
elements.