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Grade 8 Quizzes, Questions & Answers

Recent Grade 8 Quizzes

Understanding Chemical Bonds and Reactions

Questions: 8 | Attempts: 16 | Last updated: Feb 23, 2026

Sample Question
What is a chemical bond?

A force that holds atoms together

A type of chemical reaction

A physical change in matter

A mixture of elements

Words of the Week: Definitions and Examples

Questions: 8 | Attempts: 10 | Last updated: Feb 23, 2026

Sample Question
What does 'matrilineal' mean?

Tracing family descent through the father's side

Tracing family descent through the mother's side

A relationship between people who share the same blood

A journalist who exposes corruption

Deep Nutrients: The Power of Ocean Upwelling

Questions: 20 | Attempts: 11 | Last updated: Mar 3, 2026

Sample Question
What is the primary physical movement involved in the process of upwelling?

Deeper water rising to the surface

Surface water sinking to the bottom

Water moving only in horizontal circles

Evaporation of the ocean surface

Tides moving toward the shore

Coastal Shifts: Measuring the Tidal Range

Questions: 20 | Attempts: 13 | Last updated: Mar 3, 2026

Sample Question
What is the scientific definition of a tidal range?

The vertical difference in height between high tide and low tide

The distance a wave travels in one minute

The total depth of the ocean floor

The speed of the water moving toward the shore

The distance between the Sun and the Moon

Crashing Down: How Breaking Waves Form

Questions: 20 | Attempts: 13 | Last updated: Mar 3, 2026

Sample Question
What is the primary cause of a wave breaking as it approaches the shore?

Friction with the seafloor slows the bottom of the wave

The water gets too hot

Fish push the water toward the sand

The wind stops blowing

The moon pulls the wave over

The Power of Height: Wave Amplitude and Energy

Questions: 20 | Attempts: 36 | Last updated: Mar 3, 2026

Sample Question
In the study of wave relationships, what does wave amplitude specifically measure?

The maximum distance a wave moves from its rest position

The total length of the wave from start to finish

The number of waves that pass in one second

The speed at which the wave travels

The thickness of the medium

The Great Resets: Understanding Mass Extinction Events

Questions: 20 | Attempts: 12 | Last updated: Mar 3, 2026

Sample Question
What is the general definition of a mass extinction?

A widespread and rapid decrease in the biodiversity on Earth

When one single animal species dies out

When a volcano erupts in one city

When animals go into hibernation

A period when the sun stops shining

Survival of the Fittest: Natural Selection Explained

Questions: 20 | Attempts: 185 | Last updated: Mar 3, 2026

Sample Question
Who is the scientist primarily credited with proposing the theory of natural selection after visiting the Galapagos Islands?

Charles Darwin

Jean-Baptiste Lamarck

Gregor Mendel

Albert Einstein

Isaac Newton

The Rosetta Stone: The Genetic Code Chart

Questions: 20 | Attempts: 71 | Last updated: Mar 2, 2026

Sample Question
What is the main purpose of the genetic code chart used by scientists?

To translate mRNA codons into specific amino acids

To count the number of cells

To measure the speed of DNA

To find the weight of a nucleus

To see the color of a gene

System Error: Lysosomal Storage Diseases

Questions: 20 | Attempts: 12 | Last updated: Feb 23, 2026

Sample Question
What is the primary cause of lysosomal storage diseases?

A missing or malfunctioning enzyme

Too much oxygen in the cell

A lack of sunlight

Having too many lysosomes

The cell wall being too thick

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