Grade 2 Science: 10 Free Practice Questions

Answer: Compare and contrast
The passage uses compare and contrast structure because it discusses differences between two habitats. Notice that two habitats are being examined side by side for their differences in climate, plants, and animals. This side-by-side difference focus is compare and contrast structure. Students may pick description thinking each habitat is just being described, but the passage's purpose is to highlight differences between the two, not just list facts about one.

Answer: Gas has mass and is a form of matter
The extra weight of the full balloon shows that the gas inside has mass, proving that gas is a form of matter. Even though gas is invisible and spreads out, it still has particles with mass. The full balloon contains more air particles than the empty one, so it weighs slightly more, demonstrating that gases, like solids and liquids, are matter. Students often assume gases like air have no weight because they cannot be seen, missing that gas particles still have mass, just spread out.

Answer: wood
Wood is hard and does not bend, which matches the description in the question.

Answer: Rubber eraser
A rubber eraser is not attracted to a magnet because rubber is not a magnetic material. Magnets attract materials like iron and steel. Rubber is neither iron nor steel, so it is not pulled by a magnet, unlike the nail, spoon, and paper clip. Students may assume all household objects react to magnets regardless of what material they are made from.

Answer: Vocal cords
Vocal cords vibrate to produce the sound of your voice. Air from the lungs passes over the vocal cords in the throat, causing them to vibrate and produce sound, which is then shaped into speech. Students may not realize sound production requires vibration and might guess unrelated body parts.

Answer: How rain forms and falls from clouds
The passage explains the process of how rain forms and falls. Every detail describes water droplets joining and falling, which supports the main idea about how rain forms. Students may pick C because plants and rain seem related, but the passage never mentions plants using water.

Answer: bird
A bird helps plants reproduce because it eats fruit and drops the seeds in a new place.

Answer: Some plants and animals may not survive without enough water
A drought reduces water needed by pond plants and animals to survive, so some may not survive the change. Consider that water is essential for pond life. Less water means less habitat and resources, harming living things. Students may assume ecosystems are unaffected by environmental changes like drought.

Answer: Happens quickly
A sudden hurricane battering the coast is an event that happens quickly.

Answer: It dissolved and mixed into the water
The sugar dissolved, breaking into tiny pieces that mixed evenly with the water. When a solid like sugar dissolves in a liquid like water, it breaks apart into particles too small to see, spreading throughout the water. The sugar is still there, just not visible. Students may think the sugar disappeared completely or turned into a gas, not understanding dissolving.