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Archive · October 30, 2026

Grade 7 Science: 10 Free Practice Questions

A brand-new set of Grade 7 science practice questions every single day, with the answer and a full explanation for each one. No account, no paywall — tap an answer to check it.

1In the human circulatory system, which chamber of the heart pumps oxygen-rich blood out to the body?

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Answer: Left ventricle
The left ventricle has the thickest muscular wall and pumps oxygenated blood through the aorta to the rest of the body. The right ventricle pumps deoxygenated blood to the lungs.

2Which human activity most directly contributes to increased levels of carbon dioxide in the atmosphere?

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Answer: Burning fossil fuels such as coal, oil, and natural gas
Burning fossil fuels releases large amounts of carbon dioxide, a greenhouse gas, into the atmosphere. Planting trees, recycling, and using wind energy help reduce or do not add to atmospheric carbon dioxide.

3A toy car travels a distance of 10 meters in 5 seconds at a constant speed. What is the car's average speed?

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Answer: 2 m/s
Average speed = distance / time = 10 m / 5 s = 2 m/s. Distractors result from adding, multiplying, or subtracting the given values instead of dividing.

4What type of energy does a moving car have?

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Answer: kinetic energy
Moving objects have kinetic energy.

5A weather map shows tightly packed isobars (lines of equal pressure) over a region. What does this most likely indicate about the weather in that area?

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Answer: Strong winds, because a steep pressure gradient causes air to move quickly
Tightly packed isobars indicate a steep pressure gradient over a short distance, which causes air to accelerate more quickly from high to low pressure, resulting in stronger winds.

6Which describes the role of a decomposer in an ecosystem?

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Answer: breaks down dead organisms and returns nutrients
Decomposers recycle nutrients.

7According to Newton's second law, what net force is required to accelerate a 8 kg object at 2 m/s²?

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Answer: 16 N
Newton's second law states force = mass × acceleration, so F = 8 kg × 2 m/s² = 16 N. Distractors come from adding or subtracting the values instead of multiplying.

8What causes the seasons on Earth?

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Answer: Earth's tilted axis as it orbits the Sun
Tilt changes how directly sunlight hits each hemisphere.

9A pot of water is heated on a stove, and warmer water at the bottom rises while cooler water sinks, creating a circular current. This process is an example of which type of heat transfer?

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Answer: Convection
Convection occurs when heated fluid (liquid or gas) becomes less dense and rises, while cooler, denser fluid sinks, creating a circulating current that transfers thermal energy.

10Which best explains why carbon, hydrogen, and oxygen atoms are conserved when wood burns in a campfire, even though the wood appears to disappear?

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Answer: The atoms are rearranged into new substances, such as carbon dioxide, water vapor, and ash, rather than being destroyed
The law of conservation of mass means atoms are never created or destroyed in a chemical reaction; when wood burns, its atoms recombine into new substances such as carbon dioxide, water vapor, and ash.

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