BMST Science 5

Question 1

Which of the following best describes a chemical change?

Accepted Answer

Iron rusting over time

Answer

Rusting is a chemical change because iron reacts with oxygen to form a new substance, iron oxide.

Question 2

What force keeps planets in orbit around the Sun?

Accepted Answer

Gravity

Answer

Gravity is the attractive force between masses that keeps planets in their orbital paths around the Sun.

Question 3

In a food chain, organisms that make their own food using sunlight are called:

Accepted Answer

Producers

Answer

Producers (mainly plants) use photosynthesis to convert sunlight into food energy.

Question 4

Which type of wave requires a medium to travel through?

Accepted Answer

Mechanical wave

Answer

Mechanical waves, such as sound, need a physical medium (solid, liquid, or gas) to propagate.

Question 5

What is the term for the number of protons in the nucleus of an atom?

Accepted Answer

Atomic number

Answer

The atomic number defines an element and equals the number of protons in its nucleus.

BMST - Basic Math and Science Test Practice Test