8th grade Science practice sheet
Washington State Learning Standards · from Gradelings · Name: ______________________
Question 1
Which has the shortest wavelength?
- infrared
- gamma rays
- visible light
- microwaves
gamma rays
Hint: Gamma rays have the shortest wavelength and the most energy.
Question 2
What unit is used to measure force?
- second
- meter
- newton
- kilogram
newton
Hint: It is named for Sir Isaac Newton.
Question 3
When we say energy dissipates from a machine, we mean it…
- is destroyed
- spreads out as less useful energy, such as heat and sound
- is stored forever
- turns into mass
spreads out as less useful energy, such as heat and sound
Hint: Energy is conserved, but it can spread out in forms that are hard to use.
Question 4
A roller coaster at the bottom of a hill has the most…
- nuclear energy
- potential energy
- chemical energy
- kinetic energy
kinetic energy
Hint: Fastest point.
Question 5
Gravity between two objects is stronger when they are…
- colder
- more massive and closer
- the same color
- less massive and farther
more massive and closer
Hint: Mass and distance.
Question 6
A recessive trait shows only when…
- it is cold
- two recessive alleles are present
- the parent is older
- one dominant allele is present
two recessive alleles are present
Hint: Lower-case pair.
Question 7
Finches with different beaks on different islands show…
- no variation
- same diets
- random paint
- adaptation to different foods
adaptation to different foods
Hint: Beaks match food.
Question 8
Which is the largest planet?
- Mars
- Jupiter
- Earth
- Mercury
Jupiter
Hint: A gas giant.
Question 9
Dinosaurs (other than birds) went extinct about…
- 10,000 years ago
- 66 million years ago
- last century
- 1 billion years ago
66 million years ago
Hint: End of the Cretaceous.
Question 10
Which has the longest wavelength?
- ultraviolet
- visible light
- X-rays
- radio waves
radio waves
Hint: In order from longest to shortest: radio, microwave, infrared, visible, ultraviolet, X-ray, gamma.
Answer key
- 1. gamma rays (Light & Radiation)
- 2. newton (Motion, Forces & Newton’s Laws)
- 3. spreads out as less useful energy, such as heat and sound (Work, Energy & Efficiency)
- 4. kinetic energy (Kinetic & Potential Energy)
- 5. more massive and closer (Fields & Forces at a Distance)
- 6. two recessive alleles are present (Genes & Heredity)
- 7. adaptation to different foods (Natural Selection)
- 8. Jupiter (Space Systems)
- 9. 66 million years ago (Earth's History & Fossils)
- 10. radio waves (Light & Radiation)
Want more than 10 questions?
In Gradelings the questions change every time and adjust to your child, with hints and kind feedback. See all science units.