General Science Knowledge Practice Questions Answers

1. "C" is the answer that doesn't fit. The hypothalamus is located just above the brain stem and is an early developing part of the brain. Arteries and veins are conduits for blood flow. The left and right ventricles are chambers in the heart.

2. The correct answer is "c" because protein is absolutely necessary for muscle, tissue, and organ growth and healing. Proteins are often referred to as the "building blocks" of the human body.

3. The correct answer is "a." A rusting pipe involves a chemical reaction in which the iron pipe oxidizes or turns into iron oxide. Iron oxide is formed when the oxygen in water combines with iron. In the evaporation of dry ice, the chemical composition does not change and the individual elements of the ice remain the same. Helium is an inert gas and doesn't combine with other elements, so there is no chemical change in this answer either. Soil erosion is not a chemical action; it is a result of the physical action of water and wind on the earth's surface.

4. The correct answer is "c" or photosynthesis. The other choices are either misleading or wrong. Thawing is the opposite of freezing. Composting is a gardening practice where plant material is broken down into humus or fertilizers. Respiration refers to animal activity, not plant activity.

5. The correct answer is "b". Crows can often be seen scavenging or pecking at dead animals on the road or elsewhere. In that regard, they are much like the better known scavenger, the vulture. Squirrels, cows, and horses eat plant materials like grass or acorns but grazing is not thought of as scavenging in the scientific sense of the word.

6. The best answer is "b." Inertia is the tendency of an object to remain at rest unless sufficient force is put upon it to move the object. The other choices are nonsensical. Objects in motion don't gain speed unless additional force is applied. Matter sometimes disintegrates but that has nothing to do with inertia. Choice "d" is a wrong choice because objects in motion tend to keep moving in the same direction unless a directional force is applied.

7. During the lunar eclipse, the shadow of the earth falls on the moon and it appears to darken and disappear. The only way the earth's shadow could fall on the moon is for the earth to be in a straight line between the sun and the moon. All three orbs must be lined up, with the earth between the sun and the moon. Therefore, "a" is the correct choice.