6th Grade Science Quiz
Questions: 16 · 10 minutes
1. Which organism acts mainly as a decomposer in an ecosystem?
A hawk catching a mouse
A grasshopper eating a leaf
A mushroom breaking down a fallen log
A sunflower making sugar from sunlight
2. Which statement best describes the particles in a gas?
They are locked into fixed positions.
They are tightly packed and only vibrate.
They are far apart and move freely in many directions.
They have no mass and take up no space.
3. Layers of sand and mud are pressed and cemented together over time. What type of rock is most likely to form?
Sedimentary rock
Igneous rock
Magma
Metamorphic rock
4. Two solid blocks have the same volume. Block A has more mass than Block B. What can be concluded?
Block A has less density than Block B.
Block A has greater density than Block B.
The blocks must have the same density because their volumes match.
Density cannot be compared unless both blocks have the same mass.
5. An ice cube melts in a cup but remains water. Which statement best describes this change?
It is a chemical change because heat enters the ice.
It is a chemical change because a solid becomes a liquid.
It is a physical change because the substance is still water.
It is a physical change because the water molecules disappear.
6. A stream carrying sand enters a calm lake and slows down. What is most likely to happen to much of the sand?
It evaporates with the stream water.
It rises into the atmosphere through condensation.
It changes chemically into lake water.
It settles to the bottom through deposition.
7. Why can the Moon appear bright when viewed from Earth?
The Moon produces light through combustion.
The Moon stores daylight and releases it at night.
Earth's atmosphere makes the Moon generate visible light.
The Moon reflects light from the Sun.
8. In a grassland food web, grass is eaten by rabbits and insects. If the amount of grass decreases greatly, what is the most likely short-term effect?
Rabbits and insects will have more available food.
Rabbits will immediately begin producing their own food.
The grassland will receive less sunlight.
Rabbit and insect populations may decrease because food is limited.
9. Why does each hemisphere experience different seasons during the year?
Earth moves much closer to the Sun during summer in each hemisphere.
Earth's tilted axis changes the angle and duration of sunlight as Earth orbits the Sun.
The Sun produces much more energy during some months than others.
Clouds block most sunlight during winter everywhere on Earth.
10. Which cell structure allows plant cells to capture light energy for photosynthesis?
Chloroplast
Nucleus
Cell membrane
Vacuole
11. A student tests whether the amount of sunlight affects bean plant growth. The plants receive different amounts of sunlight but the same soil, water, and pot size. What is the independent variable?
The pot size
The amount of plant growth
The type of soil
The amount of sunlight
12. A soccer ball is resting on level ground. A player kicks it, and it begins moving forward. What caused its motion to change?
An unbalanced force acted on the ball.
The ball's mass temporarily decreased.
Gravity stopped acting on the ball.
The forces on the ball remained balanced.
13. Two identical bulbs are connected to a battery in a parallel circuit. One bulb is removed while its branch remains open. What is most likely to happen to the other bulb?
It also goes out because every circuit has only one path.
It stays lit because its branch still provides a complete path.
It goes out because removing a bulb removes the battery's energy.
It stays lit only if electricity can cross the open branch.
14. Students test whether fertilizer affects tomato plant growth. Which setup is the best control group?
Plants given twice the tested amount of fertilizer
Plants placed in darkness and given fertilizer
Plants grown under the same conditions without fertilizer
Plants given fertilizer but no water
15. A student mixes baking soda and vinegar and observes rapid bubbling. Which observation is the strongest evidence that a chemical reaction occurred?
The two substances were placed in the same container.
A gas was produced as new substances formed.
The mixture remained made of matter.
The liquid took the shape of its container.
16. Water vapor cools and forms tiny liquid droplets on the outside of a cold glass. Which process occurred?
Condensation
Freezing
Precipitation
Evaporation