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Archive · October 31, 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.

1A student wants to test whether the color of light affects the rate of plant growth. Which of the following would be the best control group for this experiment?

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Answer: A plant grown under normal white light with all other conditions identical to the test plants
A proper control group should differ from the experimental groups only in the variable being tested (light color) while all other conditions, such as water and soil, remain identical, allowing for a valid comparison.

2A mineral sample has a mass of 21 grams and a volume of 7 cubic centimeters. What is the density of the sample?

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Answer: 3 g/cm3
Density = mass / volume = 21 g / 7 cm3 = 3 g/cm3. Distractors come from adding or multiplying the values instead of dividing.

3A population of beetles varies in color from light brown to dark brown. After a wildfire blackens the local habitat, dark brown beetles become far more common over several generations. Which concept best explains this change?

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Answer: Natural selection, because dark beetles are better camouflaged and more likely to survive and reproduce
Natural selection favors traits that improve survival and reproduction in a given environment; after the fire, darker coloration provided better camouflage, so dark beetles survived and reproduced at higher rates, shifting the population.

4According to Newton's second law, what net force is required to accelerate a 5 kg object at 6 m/s²?

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Answer: 30 N
Newton's second law states force = mass × acceleration, so F = 5 kg × 6 m/s² = 30 N. Distractors come from adding or subtracting the values instead of multiplying.

5Convection is heat transfer by

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Answer: the movement of fluids
Warm fluid rises and cool fluid sinks.

6Which best explains how energy is transferred through a sound wave traveling through air?

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Answer: Air particles vibrate and collide with neighboring particles, transferring energy without the particles traveling with the wave
A sound wave is a mechanical wave; energy passes from particle to particle through vibration and collision, but the particles themselves oscillate in place rather than traveling with the wave.

7A toy car travels a distance of 36 meters in 3 seconds at a constant speed. What is the car's average speed?

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Answer: 12 m/s
Average speed = distance / time = 36 m / 3 s = 12 m/s. Distractors result from adding, multiplying, or subtracting the given values instead of dividing.

8Using the formula PE = mgh (with g = 10 m/s²), what is the gravitational potential energy of a 4 kg object raised 3 meters above the ground?

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Answer: 120 J
PE = mgh = 4 kg × 10 m/s² × 3 m = 120 J. Distractors result from omitting a factor or performing the wrong operation.

9Which action best helps protect an ocean ecosystem?

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Answer: reducing plastic waste
Less plastic means less harm to marine life.

10Two parents are both Bb (B is dominant). What chance does an offspring have of being bb?

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Answer: 25%
The cross gives BB, Bb, Bb, bb.

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