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WorksheetsScience Practice 4
Total questions: 54
Worksheet time: 27mins
Why is 2 the atomic number of Helium (He)?
Because He has 2 protons and 2 Neutrons
Because He has 1 proton and 1 Neutron
Because He has
2 electrons
Because He has 2 protons
Identify the category of the element Silicon (Si).
Metal
Metalloid
Non-metal
According to the information in the chart, what does Fe and Cu have in common?
Mass
Density= --------
Volume
Similar Density
Similar Melting Point
Similar Conductivity
Similar Magnetism
Which of the following elements is a non-metal?
Iron (Fe)
Oxygen (O)
Silver (Ag)
What object has more density?
mass
Density=----------------
Volume
A
B
C
D
Janice is learning about compounds. Which of the following best describes a compound?
a substance made up purely of one element
a group of substances that are either acids or bases
a group of substances that can be separated by a physical change
a substance made up of two or more elements that are chemically combined
Scientific theories are developed over time in all areas of science. Which statement best describes scientific theories?
They are based on scientific laws that came first.
They are pieces of scientific evidence that support a hypothesis.
They are explanations of scientific events that may change based on continuous research.
They are predictions of events that usually remain constant because scientific ideas rarely change.
Many interactions occur between the biosphere and the atmosphere. One of these interactions results in changes in atmospheric carbon dioxide (CO2) levels. The graph below shows these changes over a two-year period. Which of the following changes in the biosphere most likely caused these changes in the atmospheric CO2 levels?
Streams froze in the winter and melted in the spring.
Plants grew leaves in the spring and lost leaves in the fall.
Offspring were born in the summer and matured in the fall.
Soil dried out in the summer and absorbed moisture in the winter.
Jordan adds some soil and plants to a large glass jar to build a terrarium. He waters the plants and then adds two snails, two crickets, and an earthworm to the jar. Jordan then places the lid tightly on the jar and sets it on a sunny windowsill. Based on the law of conservation of mass, which of the following is expected to occur inside Jordan’s terrarium?
The mass will increase as the plants grow and decrease when the snails eat the plants.
The mass will increase as the earthworm digests the soil.
The mass will decrease when the crickets die.
The mass will neither increase nor decrease.
Which of the following types of radiation has the longest wavelength?
Infrared
Ultraviolet
X-rays
Gamma rays
Accurately answering which question would best help distinguish these organisms as members of the animal kingdom rather than the plant or fungi kingdom?
1
2
3
4
Atoms are made up of subatomic particles, including neutrons. Which of the following describes a neutron?
has a greater volume than the electron cloud
has more mass than the nucleus
has no charge
has no mass
Mandy applies the brakes on her bicycle and stops quickly to avoid hitting a basketball that bounces into the street. Which of the following best explains what happens to the bicycle’s kinetic energy?
It increases because the tires make a screeching noise.
It is destroyed because Mandy stops the bicycle quickly.
It remains the same because Mandy is the source of energy.
It is transformed to heat because the tires are slowed by friction.
The diagram shows two hypotheses for the same process that occurs beneath Earth’s surface. Which of the following processes is represented by these hypotheses?
convection current movement in Earth’s mantle
plate movements in Earth’s outer core
layer separation in Earth’s inner core
rock formation in Earth’s lithosphere
North Atlantic right whales live in the ocean near the east coast of the United States and Canada. Fewer than 500 of these whales exist. Which of the following would contribute to the extinction of the North Atlantic right whales?
Species that compete with right whales move to new habitats.
Humans develop breeding programs for right whales in aquariums.
The environment changes faster than right whale populations can adapt.
New technologies prevent right whales from being caught in fishing gear
What does the modern horse have in common with the rest of horses in the picture?
Similar DNA
Similar adaptation
Similar ancestor
Similar Skeletal System
The diagram below identifies three structures found in the human body. Which level of organization describes each of these three structures?
cell
organ
organism
tissue
A space probe lands on a planet that has half the pull of gravity as Earth. What effect does this have on the space probe’s weight and mass?
Its weight is reduced to half its weight on Earth, and its mass remains the same as on Earth.
Its weight remains the same as on Earth, and its mass is reduced to half its mass on Earth.
Both its weight and mass are half of what they are on Earth.
Both its weight and mass remain the same as on Earth.
Cells experience similar processes. One of these processes involves controlling cellular wastes. Why do cells undergo processes that control cellular wastes?
All cells must release cellular wastes to maintain homeostasis.
Plant cells eliminate cellular wastes to regulate the rate of cell reproduction.
Animal cells extract energy from cellular wastes to perform cellular functions.
All cells must release cellular wastes to provide a means of maintaining cell size.
Nancy observes the Moon from the same location outside each night for one week. She notices that when it first appears each night, the Moon is a little farther east than it was the night before. Which of the following is one explanation for her observation?
The Moon’s speed of rotation changes as it revolves around Earth.
The Moon revolves around Earth as Earth revolves around the Sun.
The Moon and Earth take the same amount of time to complete one rotation.
The Moon completes one rotation each time Earth completes one revolution.
Brittany is investigating plant growth. She completes the following activities in class.
Which statement best describes why activity 1 is an experiment and activity 2 is an investigation?
ctivity 1 takes more time to set up than activity 2 does.
Activity 1 requires more trials than activity 2 does.
Only activity 1 requires the adding of fertilizer.
Only activity 1 has a control and variables.
At a mid-ocean ridge, plates are pulled apart. Fracturing in the sea floor allows magma to move up from the mantle. The diagram below shows two plates that are moving apart. Which process in the rock cycle does this diagram best represent?
chemical weathering of rocks
erosion of sedimentary rocks
compaction of melted rock
formation of igneous rock
Students compared the solubility of ammonium chloride in water at different temperatures. They recorded their results as mass, in grams (g), dissolved in 100 milliliters (mL) of water at different temperatures, in degrees Celsius (°C), as shown in the graph below. Which statement best compares the solubility of these substances?
Alligators are found throughout Florida. Some of the characteristics of alligators are listed below.
● They are usually found in slow-flowing rivers.
● Females live in a small area.
● They eat fish, snails, birds, frogs, and mammals.
● Males live in areas of more than five square kilometers.
● They reduce their level of activity during winter.
● Females make large nests and protect their young.
Which limiting factor in an ecosystem would have the greatest impact on the alligator populations in Florida?
reduction of shelter and nesting sites
diseases that affect a certain frog species
competition among male alligators for a mate
increase in the rate of water flowing in a river
Wanda lists some heat transfers that can occur in an ocean, as shown below.
Which description from Wanda’s list best represents radiation?
Warm water moves upward, and cold water moves downward.
Energy from the Sun heats the ocean’s surface.
Warm air transfers heat to the ocean as it blows across the ocean’s surface.
A stream of hot water from an opening on the ocean floor heats the water that touches the stream.
Scientists who investigate microscopic fossils are known as micropaleontologists. Which of the following would these scientists most likely study?
the rocks that identify the location of ancient continents
the evidence of changes in the climate of ancient Earth
the different elevations of the surface of ancient Earth
the rocks that contain evidence of ancient organisms
Joanna and Mason hang a small box from a string and place two electric fans near the box. When they turn on both fans to the same setting, Joanna and Mason observe that the box begins to swing.
What is the correct conclusion in Joanna and Mason investigation?
The box swings because of the net force generated by fans at 55 Newtons
The box swings to the left because of the net force generated by fans at 55 Newtons
The box swings to the right due to a net force of 5 N generated by fans.
Petter and Mia hang a small box from a string and place two electric fans near the box. When they turn on both fans to the same setting, Petter and Mia observe that the box still and it is not moving at all.
What is the correct conclusion in Petter and Mia investigation?
The box is not moving due to net force generated by fans is 40 N
The box is not moving due to unbalanced force generated by fans.
The box is not moving because gravitational force acting on it.
The box is not moving because net force generated by fans is Zero.
The Andromeda Galaxy was previously called the Great Andromeda Nebula because astronomers thought this patch of light was composed of glowing gases. In the 1900s, scientists determined the nebula was actually a spiral galaxy. Which of the following describes the relationship between this galaxy and other astronomical bodies?
This galaxy is the largest star and is found in the universe.
This galaxy is surrounded by thousands of stars in the universe.
This galaxy includes a universe that is composed of millions of stars.
This galaxy is one of many of galaxies in the universe and contains billions of stars.
Throughout history, scientific knowledge has changed. Which of the following resulted in an important change in scientific knowledge?
the observation of phase changes of the Moon
the development of a hypothesis describing possible life on Mars
the prediction of when a comet would be most clearly visible from Earth
the discovery of the function of the DNA molecule
. Cassandra flashes a beam of white light toward a prism. The prism separates the white light into different colors. Which of the following causes the separation of the white light?
The white light is concentrated.
The white light is absorbed.
The white light is refracted.
The white light is reflected.
Nyles used a microscope to observe two different types of cells. Drawings of the two cells are shown below.
Which of the following best contrasts the functions of the cell parts labeled X and Y?
Part X stores water for future use, whereas part Y releases water out of the cell.
Part X holds the structures in place in the cell, whereas part Y keeps all molecules from leaving the cell.
Part X provides energy for the cell, whereas part Y helps with photosynthesis in the presence of sunlight.
Part X regulates substances that enter or exit the cell, whereas part Y provides protection and support to the cell.
A student claims that studying rock layers on the side of a mountain would show that Earth has changed over geologic time. Which type of evidence from the rock layers best supports this claim?
Some rock layers are solid, and other rock layers have holes that store water.
Some rock layers contain fossils of plants, and other rock layers contain fossils of marine animals.
Rock layers that are thick and smooth are deeper than rock layers that are thin and rough.
Rock layers that are composed of sand and silt are found in different locations.
. In 1980, a scientific journal published an article describing the observations that led to a hypothesis. The hypothesis stated that an asteroid striking Earth brought about the extinction of the dinosaurs. Which of the following would best provide support for a scientific hypothesis?
opinions and personal beliefs
new evidence and additional observations
new evidence and personal opinions
additional observations and informed predictions
Ms. Brooks demonstrated phase changes to her class. She lit a candle and let the melting wax drop into a beaker of cold water, as shown below. The temperature of the water was four degrees Celsius (4°C).
Which statement best explains what happened to the wax as it came in contact with the cold water in the beaker?
he wax changed from a liquid to a solid as it gave off heat to its surroundings.
he wax changed from a liquid to a solid as it increased in temperature.
The wax remained in the liquid phase as it decreased in temperature.
The wax remained in the liquid phase as it absorbed heat.
. The planet Saturn takes 10,747 Earth days to complete one orbit around the Sun. Why does Saturn take longer to complete one orbit around the Sun than Earth does?
Saturn has stronger gravity.
Saturn is farther from the Sun.
Saturn has a thicker atmosphere.
Saturn is the only planet with rings.
A group of students slowly poured 100 milliliters (mL) of vegetable oil, 100 mL of colored water, and 100 mL of corn syrup into a 500-mL beaker. The students observed the beaker after 5 minutes and recorded their observations in their science notebooks. Which of the following are the students most likely trying to compare?
the volume of the liquids
the density of the liquids
the weight of the liquids
the color of the liquids
A chemist observes a reaction between two substances in a closed container. Which of the following would most likely happen if the temperature is increased inside the container?
The rate of the reaction would increase.
The mass of each of the atoms would increase.
The two substances would release nuclear energy.
he two substances would not change into different compounds.
. All plants and animals have threadlike structures in the nucleus of each cell. These structures contain a set of instructions in the form of DNA. Which of the following terms identifies these threadlike structures?
mitochondria
cytoplasm
chromosomes
alleles
What is correct about Mitosis?
produce two identical daughter cells
produce four identical daughter cells
produce two different daughter cells
produce four different daughter cells
What is correct about Meiosis?
Why is the weather changing constantly in Earth?
The weather is changing constantly due to the Earth's axial tilt and elliptical orbit of Earth around Sun
The weather changes due to Earth is sometimes close to Sun and sometimes it is far from Sun
The pH level of vinegar is around 2.4 to 3.4, making it a mildly acidic substance. Baking soda, also known as sodium bicarbonate, has a pH of 9, making it a mildly alkaline substance. What is an example of substance with neutral pH?
orange juice
toothpaste
gastric juice
salt
What process is taking place between New Moon and Full Moon?
Spring Tides
Neap Tides
Waning
Waxing
What are the hotter stars?
Red
White
Blue
Supergiants
Scientists use a system called binomial nomenclature to classify organisms.
For example, the wolfdog is known as Canis lupus. Each of the two names has a different significance. Which of the following correctly describes the meaning of the two names?
Canis is a distant evolutionary ancestor of the wolfdog, while lupus is a more recent species.
Canis is a group of organisms with similar external structures, while lupus is a group with similar internal structures.
Canis is a group of organisms with similar behavior, while lupus is a group with similar structures.
Canis is a group of different organisms with similar structures, while lupus is a smaller group of members that can only breed with another lupus.
The picture represents Hydrogen Isotope. What is similar between those Hydrogen atoms?
Atomic mass
Number of electrons around the nucleus
Number of neutrons in the nucleus
Number of protons in the nucleus
In electrical applications, bronze makes it less effective as an electrical conductor than copper, bronze has better mechanical strength and corrosion resistance, but In copper, free electrons move easily through the metal’s crystal structure. What property is compared about copper and bronze?
Magnetism
Density
Melting point
Conductivity
What is the picture representing?
Water cycle
Air pressure in atmosphere
Global warming
Atmospheric convection
Why does Earth experiment different weathers?
Elliptical orbit of Earth around Sun
Sometimes Earth is close to the Sun and sometimes far away.
Earth has less gravitational force than Sun
Earth is tilted at 23.5 degrees as it orbits the sun.
Friction is an example of contact force between two objects. What statement is correct about friction?
How does gravity affect a rocket's motion in space as it moves away from Earth?
Gravity remains constant regardless of distance from Earth
Gravity completely disappears once the rocket leaves Earth's atmosphere
Gravity gradually decreases as the distance from Earth increases
Gravity increases as the rocket moves further into space
Graphic represents an object in motion. What is the speed of the object at 20 seconds?
20 m/s
40 m/s
1 m/s
object is accelerating
As water pass from liquid to solid, it is changing the state of matter of water. What statement support this information?
That's representing a Chemical Change
Water is releasing heat during its transition
Water is absorbing heat during its transition
Water is not absorbing or releasing heat during its transition
