PSSA PSSA Physical Science 1

Question 1

What is the definition of density?

Accepted Answer

The mass of an object per unit volume

Answer

Density is defined as the mass of a substance divided by its volume (D = m/v).

Question 2

What is acceleration?

Accepted Answer

The rate of change of velocity over time

Answer

Acceleration is the rate at which an object's velocity changes over time, measured in m/s².

Question 3

Which of the following is an example of potential energy?

Accepted Answer

A rock at the top of a hill

Answer

A rock at the top of a hill has gravitational potential energy due to its position above the ground.

Question 4

What happens to the volume of a gas when pressure increases (at constant temperature)?

Accepted Answer

The volume decreases

Answer

According to Boyle's Law, the volume of a gas decreases when pressure increases at constant temperature.

Question 5

Which of the following describes an element?

Accepted Answer

A pure substance made of only one type of atom

Answer

An element is a pure substance consisting of only one type of atom, and cannot be broken down into simpler substances by chemical means.

PSSA - Pennsylvania System of School Assessment Practice Test