Grade 2 Science: 10 Free Practice Questions

Answer: cloud
The cloud contains tiny drops of water vapor; it can fall back to Earth as rain.

Answer: Air
Air is a nonliving part of ecosystems, while birds, trees, and insects are living things. Sort each choice as living or nonliving. Air does not grow, reproduce, or respond to its environment, making it nonliving. Students may overlook air as a nonliving component since it's invisible and less obvious than water or soil.

Answer: They are likely made of different materials
Different weights for the same-sized objects suggest they are made of different materials. Weight depends on the material's density, not just size. Since the blocks are the same size but different weights, they are likely made of different materials (for example, wood vs. metal). Students may think size alone determines weight, ignoring the role of material density.

Answer: A pot sitting on a lit stove
A pot on a lit stove receives direct heat and becomes hot to touch. A stove burner produces heat, and objects placed directly on it, like a pot, absorb that heat and become hot, unlike items stored in a cold refrigerator or freezer. Students may confuse cold objects like ice or refrigerated items with hot objects if they do not focus on the heat source described in each choice.

Answer: Heat energy moved from the soup into the spoon
Heat energy moved from the hot soup into the cooler metal spoon. Heat energy naturally moves from warmer objects to cooler ones. The soup, being hot, transferred heat energy into the spoon, making it warm over time. Students might think the spoon makes its own heat, not realizing heat energy transfers between objects in contact.

Answer: Grass → Rabbit → Fox
Food chains start with a producer (grass), followed by a primary consumer (rabbit), and then a secondary consumer (fox). Energy flows from the sun to plants, then to animals that eat plants, then to animals that eat those animals: Grass → Rabbit → Fox. Students may reverse the order, starting with the predator instead of the producer.

Answer: A solar panel uses energy from the sun; a candle uses energy from burning wax
Solar panels capture energy from sunlight, while candles release energy by burning wax. Solar panels convert light energy from the sun into electrical energy. A candle produces light and heat energy through the chemical process of burning wax, which is a different energy source. Students may believe both sources work the same way, not recognizing that one relies on sunlight and the other relies on burning material.

Answer: Irreversible change
This is a irreversible change because toasted bread cannot be changed back into plain bread.

Answer: An iron nail
Magnets attract objects made of iron, such as an iron nail. Magnets pull on materials containing iron, nickel, or steel. Wood, cotton, and plastic are not magnetic, so the iron nail is the object a magnet would attract. Students may think magnets attract all objects, not just those made of certain metals.

Answer: ocean
The fish is adapted to survive in the ocean, which has salt water.