AFOQT Physical Science Principles 2

Question 1

A 10 kg object accelerates at 3 m/s². What net force acts on it?

Accepted Answer

30 N

Answer

Force equals mass times acceleration, so 10 kg × 3 m/s² = 30 N.

Question 2

Which form of energy is stored in a stretched spring?

Accepted Answer

Elastic potential energy

Answer

A stretched or compressed spring stores elastic potential energy.

Question 3

What happens to the wavelength of a wave if its frequency increases while speed stays constant?

Accepted Answer

Wavelength decreases

Answer

Since speed = frequency × wavelength, a higher frequency at constant speed means a shorter wavelength.

Question 4

Which of these is a chemical change rather than a physical change?

Accepted Answer

Rusting iron

Answer

Rusting forms a new substance (iron oxide), making it a chemical change.

Question 5

What is the SI unit of electric current?

Accepted Answer

Ampere

Answer

The ampere is the SI unit of electric current.

AFOQT Practice Test