Quiz about 8th Grade Science Readiness Standards 2024-2025

Question 1

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:

Accepted Answer

372g

Answer

360g

Answer

440g

Answer

The mass cannot be determined without more information

Question 2

Which force pair represents Newton's Third Law when a book sits on a table?

Accepted Answer

Normal force up from table and gravity down from Earth

Answer

Gravity pulling down and friction sideways

Answer

Weight of book down on table and normal force up from table

Answer

Friction between book and table surfaces

Question 3

During photosynthesis, what explains why mass is conserved?

Accepted Answer

Atoms are rearranged but not created or destroyed

Answer

Energy is converted to mass

Answer

New atoms are created from sunlight

Answer

Mass increases due to stored energy

Question 4

Which best describes a red supergiant star on the H-R diagram?

Accepted Answer

Low temperature, high luminosity

Answer

High temperature, high luminosity

Answer

High temperature, low luminosity

Answer

Low temperature, low luminosity

Question 5

During a rocket launch, which of Newton's laws explains the upward motion?

Accepted Answer

All three laws work together

Answer

First law only

Answer

Second law only

Answer

Third law only

Question 6

If Earth's axis wasn't tilted:

Accepted Answer

We would have no seasons

Answer

Seasons would be more extreme

Answer

Only the equator would have seasons

Answer

Seasons would occur monthly instead of yearly

Question 7

A car accelerates from 0 to 60 km/h in 5 seconds. If its mass is 1000kg, what was the net force?

Accepted Answer

3333.33 N

Answer

12000 N

Answer

5000 N

Answer

200 N

Question 8

In a subduction zone, what directly causes earthquakes?

Accepted Answer

Plate friction and sudden release

Answer

Magma rising

Answer

Ocean water pressure

Answer

Temperature changes

Question 9

Which abiotic factor would most directly affect plant competition in a forest?

Accepted Answer

Available sunlight

Answer

Number of herbivores

Answer

Soil bacteria

Answer

Other plant species

Question 10

When a star exhausts its hydrogen fuel, why does it expand?

Accepted Answer

Decreased core pressure

Answer

Increased fusion rate

Answer

Increased gravitational force

Answer

Decreased temperature

Question 11

If equal but opposite forces act on an object, what must be true?

Accepted Answer

The object's acceleration is zero

Answer

The object will stop moving

Answer

The object will slow down

Answer

The object will change direction

Question 12

Which best explains why plate tectonics causes mountain formation?

Accepted Answer

Compression of plates

Answer

Erosion of plates

Answer

Rotation of Earth

Answer

Ocean currents

Question 13

What happens to acceleration if you double both the force and mass?

Accepted Answer

Stays the same

Answer

Doubles

Answer

Halves

Answer

Quadruples

Question 14

In a desert ecosystem, which relationship is most direct?

Accepted Answer

Temperature and water availability

Answer

Sunlight and plant growth

Answer

Soil type and animal population

Answer

Wind and plant distribution

Question 15

How does Earth's tilt affect seasonal temperatures?

Accepted Answer

By changing the angle of incoming solar radiation

Answer

By changing Earth's distance from the Sun

Answer

By changing the Earth's rotation speed

Answer

By changing atmospheric pressure

Question 16

When two cars collide, the car with less mass experiences:

Accepted Answer

The same force

Answer

Less force

Answer

More force

Answer

Variable force

Question 17

What determines a star's position on the H-R diagram?

Accepted Answer

Temperature and luminosity

Answer

Age and size

Answer

Mass and composition

Answer

Location and motion

Question 18

A student observes that metals expand when heated. Which best explains this at the atomic level?

Accepted Answer

Atoms vibrate more vigorously and spread apart

Answer

Atoms become larger

Answer

New atoms are created by the heat

Answer

The atoms change into a different element

Question 19

If atmospheric pressure decreases with altitude, why don't all air molecules float up into space?

Accepted Answer

Earth's gravity pulls them back

Answer

Air molecules are too heavy

Answer

The ozone layer blocks them

Answer

Wind currents keep them down

Question 20

During cellular respiration, why does glucose need oxygen?

Accepted Answer

To accept electrons in the electron transport chain

Answer

To create new carbon atoms

Answer

To serve as an energy source

Answer

To break down water molecules

Question 21

A meteor enters Earth's atmosphere at 50,000 m/s. Why does it heat up?

Accepted Answer

Friction with air molecules

Answer

Radiation from the sun

Answer

Earth's magnetic field

Answer

Chemical reactions in the meteor

Question 22

Which would affect an object's momentum the most?

Accepted Answer

Doubling its velocity

Answer

Doubling its mass

Answer

Halving its mass

Answer

Halving its velocity

Question 23

On a roller coaster, where is kinetic energy highest?

Accepted Answer

At the bottom of the steepest drop

Answer

At the top of the first hill

Answer

In the middle of a loop

Answer

On a flat section

Question 24

What happens to the wavelength of light when it enters water from air?

Accepted Answer

Decreases

Answer

Increases

Answer

Stays the same

Answer

Becomes zero

Question 25

During a phase change from liquid to gas, why does temperature remain constant?

Accepted Answer

Energy goes into breaking bonds rather than increasing temperature

Answer

No energy is being added

Answer

Temperature cannot change during phase changes

Answer

The molecules stop moving

Question 26

In a food web, why might removing a producer have more impact than removing a consumer?

Accepted Answer

Producers support multiple trophic levels

Answer

Producers move faster

Answer

Producers are larger

Answer

Producers eat more organisms

Question 27

Why does an ice cube float in water?

Accepted Answer

Ice has more volume than an equal mass of water

Answer

Ice has less mass than water

Answer

Water pushes ice upward

Answer

Ice repels water

Question 28

During mitosis, what ensures daughter cells get identical DNA?

Accepted Answer

Precise replication and separation of chromosomes

Answer

Random distribution of chromosomes

Answer

Mixing of parental DNA

Answer

Mutation of genes

Question 29

Which adaptation would most help a desert plant conserve water?

Accepted Answer

Waxy coating on leaves

Answer

Broad leaves

Answer

Shallow roots

Answer

Rapid growth rate

Question 30

A pendulum's period depends most directly on:

Accepted Answer

The length of the string

Answer

The mass of the bob

Answer

The initial displacement

Answer

The surrounding air pressure

Question 31

In an electrical circuit, why do electrons flow?

Accepted Answer

Difference in electrical potential

Answer

Magnetic fields

Answer

Heat energy

Answer

Gravitational force

Question 32

When a sound wave travels through air, what actually moves?

Accepted Answer

Energy through vibrating air molecules

Answer

Air molecules from source to ear

Answer

Sound particles

Answer

Heat waves

Question 33

Why does a vacuum not conduct electricity?

Accepted Answer

No free electrons to carry charge

Answer

Too much resistance

Answer

Too much voltage

Answer

Magnetic interference

Question 34

During weather changes, why does falling air pressure often indicate approaching storms?

Accepted Answer

Low pressure allows storm systems to develop

Answer

Pressure changes cause storms

Answer

Storms create low pressure

Answer

It's just a coincidence

Question 35

What determines the color of a star?

Accepted Answer

Its surface temperature

Answer

Its age

Answer

Its size

Answer

Its distance from Earth

Question 36

In genetics, why are some traits dominant over others?

Accepted Answer

Their alleles produce functional proteins

Answer

They are newer traits

Answer

They are more important

Answer

They come from stronger parents

Question 37

Why does a spinning ice skater speed up when pulling in their arms?

Accepted Answer

Conservation of angular momentum

Answer

Less air resistance

Answer

Increased gravity

Answer

Reduced friction

Question 38

What is the primary reason for the seasons on Earth?

Accepted Answer

The tilt of Earth's axis

Answer

The speed of Earth's rotation

Answer

The shape of Earth's orbit

Answer

The distance from the sun changes

Question 39

Why does a balloon stick to a wall after being rubbed on hair?

Accepted Answer

Static electricity

Answer

Gravitational pull

Answer

Air pressure difference

Answer

Magnetic attraction

Question 40

In a chemical reaction, what does the law of conservation of mass state?

Accepted Answer

Mass is neither created nor destroyed

Answer

Mass can be created or destroyed

Answer

Mass is converted to energy

Answer

Mass increases with temperature

8th Grade Science Readiness Standards 2024-2025

43 questions

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:

Which force pair represents Newton's Third Law when a book sits on a table?

A 2kg object experiences a net force of 6N. What is its acceleration?

During photosynthesis, what explains why mass is conserved?

In the chemical formula Al₂(SO₄)₃, how many sulfur atoms are present?

Which best describes a red supergiant star on the H-R diagram?

During a rocket launch, which of Newton's laws explains the upward motion?

If Earth's axis wasn't tilted:

A car accelerates from 0 to 60 km/h in 5 seconds. If its mass is 1000kg, what was the net force?

In a subduction zone, what directly causes earthquakes?

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