8th grade Science practice sheet
Alaska content standards · from Gradelings · Name: ______________________
Question 1
Sound needs matter to travel. Light…
- cannot travel through space
- can travel through empty space
- needs water
- needs air
can travel through empty space
Hint: That is how sunlight reaches Earth.
Question 2
If the same force pushes a light cart and a heavy cart, which accelerates more?
- neither
- both the same
- the heavy cart
- the light cart
the light cart
Hint: Less mass means more acceleration.
Question 3
Which has more kinetic energy?
- A bike at 50 km/h
- A parked truck
- A ball at rest
- A truck at 50 km/h
A truck at 50 km/h
Hint: Same speed, more mass.
Question 4
Like magnetic poles…
- repel
- attract
- do nothing
- melt
repel
Hint: North pushes north.
Question 5
Mutations can be…
- always helpful
- always harmful
- never inherited
- harmful, helpful or neutral
harmful, helpful or neutral
Hint: It depends.
Question 6
Artificial selection is when…
- no one chooses
- nature chooses
- people choose which organisms breed
- weather chooses
people choose which organisms breed
Hint: Dog and crop breeding.
Question 7
A rock layer cutting across other layers is…
- impossible
- older than all of them
- younger than the layers it cuts
- the same age
younger than the layers it cuts
Hint: Cross-cutting.
Question 8
Which has the longest wavelength?
- radio waves
- X-rays
- visible light
- ultraviolet
radio waves
Hint: In order from longest to shortest: radio, microwave, infrared, visible, ultraviolet, X-ray, gamma.
Question 9
A 2 kg object accelerates at 3 m/s². What force acts on it?
- 6 N
- 9 N
- 5 N
- 1.5 N
6 N
Hint: F = 2 × 3.
Question 10
A roller coaster at the bottom of a hill has the most…
- nuclear energy
- chemical energy
- kinetic energy
- potential energy
kinetic energy
Hint: Fastest point.
Answer key
- 1. can travel through empty space (Light & Radiation)
- 2. the light cart (Motion, Forces & Newton’s Laws)
- 3. A truck at 50 km/h (Kinetic & Potential Energy)
- 4. repel (Fields & Forces at a Distance)
- 5. harmful, helpful or neutral (Genes & Heredity)
- 6. people choose which organisms breed (Natural Selection)
- 7. younger than the layers it cuts (Earth's History & Fossils)
- 8. radio waves (Light & Radiation)
- 9. 6 N (Motion, Forces & Newton’s Laws)
- 10. kinetic energy (Kinetic & Potential Energy)
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.