7th Grade Science Quiz
Questions: 16 · 10 minutes
1. Two identical bulbs are connected in parallel to a battery. If one bulb is removed while the circuit remains connected, what should happen to the other bulb?
It goes out because every parallel circuit has only one path
It changes from an electrical conductor into an insulator
It goes out because removing a bulb removes the battery's energy
It stays lit because it has a separate path to the battery
2. A metal spoon is left in a bowl of hot soup, and its handle becomes warm. Which process transfers most of the heat through the spoon?
Radiation from the soup
Convection within the solid metal
Conduction through the metal
Evaporation from the handle
3. A skateboarder moves in a straight line at a constant speed. What can be concluded about the net force on the skateboarder?
It is zero because the forces are balanced
It points in the direction of motion
It steadily increases with speed
It points opposite the direction of motion
4. During running, breathing rate and heart rate usually increase. How do the respiratory and circulatory systems work together in this situation?
They stop cellular respiration to conserve energy
They deliver more oxygen to cells and help remove carbon dioxide
They turn carbon dioxide into oxygen inside the heart
They reduce blood flow so muscles remain cool
5. In a food chain, grass is eaten by grasshoppers, and grasshoppers are eaten by frogs. If the amount of grass falls sharply, which change is most likely to happen first?
The frog population immediately increases
The grasshopper population begins to decrease
The grass begins obtaining energy from frogs
The grasshoppers become decomposers
6. What is the main role of decomposers such as fungi and many bacteria in an ecosystem?
They produce sunlight for plants
They convert predators into herbivores
They prevent all organisms from competing
They break down dead matter and recycle nutrients
7. Which cell structure captures light energy for photosynthesis in plant cells?
Nucleus
Cell membrane
Chloroplast
Mitochondrion
8. A solution with a pH of 3 has how many times greater hydrogen ion concentration than a solution with a pH of 6?
6 times greater
3 times greater
1,000 times greater
100 times greater
9. A student tests whether the amount of sunlight affects bean plant growth. Every plant receives the same soil, water, and pot size, but different hours of sunlight. What is the independent variable?
The growth of each bean plant
The number of hours of sunlight
The amount of water provided
The type and amount of soil
10. Which example is a chemical change?
An iron nail forming rust
Ice melting into liquid water
A glass bottle breaking
Sugar dissolving in water
11. A rock has a mass of 60 grams and displaces 20 milliliters of water. What is its density?
0.33 grams per milliliter
20 grams per milliliter
40 grams per milliliter
3 grams per milliliter
12. A class repeats the same carefully controlled experiment five times. Which result would provide the strongest evidence that the findings are reliable?
The trials produce similar results
Each trial uses a different procedure
The final trial gives the largest measurement
One trial matches the students' prediction
13. A layer of sedimentary rock is buried deep underground and exposed to intense heat and pressure without melting. What type of rock is most likely to form?
Molten rock
Igneous rock
New sedimentary rock formed only by weathering
Metamorphic rock
14. Which statement best explains genetic inheritance in sexual reproduction?
Offspring inherit only traits that their parents learned
Offspring receive genetic information from both parents
Environmental conditions alone determine inherited traits
Every offspring is genetically identical to one parent
15. Records show that a region usually has hot, dry summers and cool, wet winters over several decades. What do these records describe?
The region's climate
A single weather event
One seasonal forecast
The region's daily air pressure
16. What mainly causes the Moon's phases as seen from Earth?
Earth's shadow covers different parts of the Moon each week
Clouds in Earth's atmosphere block portions of the Moon
The relative positions of the Sun, Earth, and Moon change
The Moon produces different amounts of light during its orbit