CAST Science MEGA Practice Test

Front

What is the greenhouse effect?

Back

The greenhouse effect is the process by which certain gases in Earth's atmosphere trap heat, preventing it from escaping into space, thus warming the planet.

Front

What is an independent variable in an experiment?

Back

The independent variable is the factor that is changed or controlled in a scientific experiment to test its effects on the dependent variable.

Front

What does it mean for forces to be balanced?

Back

Balanced forces occur when two forces acting on an object are equal in size but opposite in direction, resulting in no change in motion.

Front

What is net force?

Back

Net force is the overall force acting on an object when all the individual forces acting on it are combined.

Front

How does an increase in kelp population affect sea urchins?

Back

An increase in kelp population typically leads to a decrease in sea urchin population due to increased competition for resources.

Front

What is the role of sunlight in Earth's climate system?

Back

Sunlight provides the energy necessary for photosynthesis, influences weather patterns, and drives the water cycle, all of which affect climate.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object, while weight is the force exerted by gravity on that mass.

Front

What is a food web?

Back

A food web is a complex network of feeding relationships among organisms in an ecosystem, showing how energy and nutrients flow.

Front

What is the significance of atomic number in chemistry?

Back

The atomic number defines the number of protons in an atom's nucleus and determines the element's identity.

Front

What happens to an object at rest when balanced forces act on it?

Back

An object at rest will remain at rest if balanced forces are acting on it.