PSSA PSSA Physical Science 1 ā Questions and Answers
Question 1: What is the definition of density?
- The amount of space an object takes up
- The mass of an object per unit volume (Correct answer)
- The weight of an object in grams
- The force applied to an object per unit area
Correct answer: The mass of an object per unit volume
Density is defined as the mass of a substance divided by its volume (D = m/v).
Question 2: What is acceleration?
- The total distance traveled by an object
- The speed of an object at a specific moment
- The rate of change of velocity over time (Correct answer)
- The force required to move an object
Correct answer: The rate of change of velocity over time
Acceleration is the rate at which an object's velocity changes over time, measured in m/sĀ².
Question 3: Which of the following is an example of potential energy?
- A moving car
- A flowing river
- A rock at the top of a hill (Correct answer)
- A spinning wheel
Correct answer: A rock at the top of a hill
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)?
- The volume increases
- The volume decreases (Correct answer)
- The volume remains the same
- The volume doubles
Correct answer: The volume decreases
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?
- A substance made of two or more different types of atoms chemically bonded
- A pure substance made of only one type of atom (Correct answer)
- A mixture of two or more substances
- A substance that can be broken down by heating
Correct answer: A pure substance made of only one type of atom
An element is a pure substance consisting of only one type of atom, and cannot be broken down into simpler substances by chemical means.
Question 6: What is friction?
- The force that pulls objects toward Earth
- A force that opposes the motion of objects moving against each other (Correct answer)
- The energy stored in compressed springs
- The tendency of an object to remain at rest
Correct answer: A force that opposes the motion of objects moving against each other
Friction is a force that resists the relative motion of surfaces in contact with each other.
PSSA PSSA Physical Science 1
What is the definition of density?