Worksheets8th Grade Science Readiness Standards 2024-2025
Total questions: 43
Worksheet time: 22mins
In a chemical reaction producing carbon dioxide and water from glucose and oxygen, if you start with 180g of glucose and 192g of oxygen, the total mass of products will be:
372g
360g
440g
The mass cannot be determined without more information
Which force pair represents Newton's Third Law when a book sits on a table?
Gravity pulling down and friction sideways
Normal force up from table and gravity down from Earth
Weight of book down on table and normal force up from table
Friction between book and table surfaces
A 2kg object experiences a net force of 6N. What is its acceleration?
12 m/s²
3 m/s²
4 m/s²
8 m/s²
During photosynthesis, what explains why mass is conserved?
Energy is converted to mass
Atoms are rearranged but not created or destroyed
New atoms are created from sunlight
Mass increases due to stored energy
In the chemical formula Al₂(SO₄)₃, how many sulfur atoms are present?
1
2
3
4
Which best describes a red supergiant star on the H-R diagram?
High temperature, high luminosity
Low temperature, high luminosity
High temperature, low luminosity
Low temperature, low luminosity
During a rocket launch, which of Newton's laws explains the upward motion?
First law only
Second law only
Third law only
All three laws work together
If Earth's axis wasn't tilted:
We would have no seasons
Seasons would be more extreme
Only the equator would have seasons
Seasons would occur monthly instead of yearly
A car accelerates from 0 to 60 km/h in 5 seconds. If its mass is 1000kg, what was the net force?
3333.33 N
12000 N
5000 N
200 N
In a subduction zone, what directly causes earthquakes?
Magma rising
Plate friction and sudden release
Ocean water pressure
Temperature changes
Which abiotic factor would most directly affect plant competition in a forest?
Number of herbivores
Available sunlight
Soil bacteria
Other plant species
When a star exhausts its hydrogen fuel, why does it expand?
Increased fusion rate
Decreased core pressure
Increased gravitational force
Decreased temperature
If equal but opposite forces act on an object, what must be true?
The object will stop moving
The object's acceleration is zero
The object will slow down
The object will change direction
In the balanced equation 2H₂ + O₂ → 2H₂O, if 4g of hydrogen reacts, how many grams of oxygen are needed?
32g
16g
8g
4g
Which best explains why plate tectonics causes mountain formation?
Erosion of plates
Compression of plates
Rotation of Earth
Ocean currents
What happens to acceleration if you double both the force and mass?
Doubles
Stays the same
Halves
Quadruples
In a desert ecosystem, which relationship is most direct?
Sunlight and plant growth
Temperature and water availability
Soil type and animal population
Wind and plant distribution
How does Earth's tilt affect seasonal temperatures?
By changing Earth's distance from the Sun
By changing the angle of incoming solar radiation
By changing the Earth's rotation speed
By changing atmospheric pressure
When two cars collide, the car with less mass experiences:
Less force
More force
The same force
Variable force
What determines a star's position on the H-R diagram?
Age and size
Mass and composition
Temperature and luminosity
Location and motion
A student observes that metals expand when heated. Which best explains this at the atomic level?
Atoms become larger
Atoms vibrate more vigorously and spread apart
New atoms are created by the heat
The atoms change into a different element
If atmospheric pressure decreases with altitude, why don't all air molecules float up into space?
Air molecules are too heavy
The ozone layer blocks them
Earth's gravity pulls them back
Wind currents keep them down
During cellular respiration, why does glucose need oxygen?
To create new carbon atoms
To serve as an energy source
To accept electrons in the electron transport chain
To break down water molecules
A meteor enters Earth's atmosphere at 50,000 m/s. Why does it heat up?
Radiation from the sun
Friction with air molecules
Earth's magnetic field
Chemical reactions in the meteor
Which would affect an object's momentum the most?
Doubling its mass
Doubling its velocity
Halving its mass
Halving its velocity
On a roller coaster, where is kinetic energy highest?
At the top of the first hill
At the bottom of the steepest drop
In the middle of a loop
On a flat section
What happens to the wavelength of light when it enters water from air?
Increases
Decreases
Stays the same
Becomes zero
During a phase change from liquid to gas, why does temperature remain constant?
No energy is being added
Energy goes into breaking bonds rather than increasing temperature
Temperature cannot change during phase changes
The molecules stop moving
In a food web, why might removing a producer have more impact than removing a consumer?
Producers move faster
Producers are larger
Producers support multiple trophic levels
Producers eat more organisms
Why does an ice cube float in water?
Ice has less mass than water
Ice has more volume than an equal mass of water
Water pushes ice upward
Ice repels water
During mitosis, what ensures daughter cells get identical DNA?
Random distribution of chromosomes
Precise replication and separation of chromosomes
Mixing of parental DNA
Mutation of genes
Which adaptation would most help a desert plant conserve water?
Broad leaves
Shallow roots
Waxy coating on leaves
Rapid growth rate
A pendulum's period depends most directly on:
The mass of the bob
The length of the string
The initial displacement
The surrounding air pressure
In an electrical circuit, why do electrons flow?
Difference in electrical potential
Magnetic fields
Heat energy
Gravitational force
When a sound wave travels through air, what actually moves?
Air molecules from source to ear
Energy through vibrating air molecules
Sound particles
Heat waves
Why does a vacuum not conduct electricity?
No free electrons to carry charge
Too much resistance
Too much voltage
Magnetic interference
During weather changes, why does falling air pressure often indicate approaching storms?
Pressure changes cause storms
Low pressure allows storm systems to develop
Storms create low pressure
It's just a coincidence
What determines the color of a star?
Its age
Its surface temperature
Its size
Its distance from Earth
In genetics, why are some traits dominant over others?
They are newer traits
They are more important
Their alleles produce functional proteins
They come from stronger parents
Why does a spinning ice skater speed up when pulling in their arms?
Less air resistance
Conservation of angular momentum
Increased gravity
Reduced friction
What is the primary reason for the seasons on Earth?
The tilt of Earth's axis
The speed of Earth's rotation
The shape of Earth's orbit
The distance from the sun changes
Why does a balloon stick to a wall after being rubbed on hair?
Static electricity
Gravitational pull
Air pressure difference
Magnetic attraction
In a chemical reaction, what does the law of conservation of mass state?
Mass can be created or destroyed
Mass is converted to energy
Mass is neither created nor destroyed
Mass increases with temperature
