ASVAB General Science Practice Questions

A: The troposphere is the lowest level of the atmosphere and where all weather affecting Earth takes place. This is the level where clouds form and from where precipitation falls.

B: Use Newton’s second law of motion, F = ma, to solve this problem. The object reached a velocity of 12 m/s in 4 seconds, so the acceleration was 12/4 = 3 m/sec^2. 15 = m(3), so m = 15/3 = 5 kg.

A: Blood carries the oxygen that cells need to function to the cells and picks up the carbon dioxide and water that they generate, so the lungs have to support that process by supplying oxygen to the blood and carrying away carbon dioxide and water.

A: Prokaryotic cells, such as bacteria, do not have nuclei. Their genetic material is contained within the main part of the cell body. Eukaryotic cells do contain nuclei where all genetic material is contained. Eukaryotic cells are plant, animal, fungi, and protist cells.

D: Mixing salt and sugar is a physical change. When mixed together, the salt and sugar retain their molecular makeup. Drying wet clothes is also a physical change. When clothes are dried, water molecules evaporate, becoming a gas. The clothes and water molecules remain chemically unchanged. When boiling a pot of water, once again, liquid water molecules move into the gas phase, but there is no change in the chemical composition of the molecules. Finally, burning wood is a chemical change, because the molecules in the wood are converted into new molecules that are different than the original.