Stemscopes Exam Physical Science 1 — Questions and Answers
Question 1: What is the SI unit of force?
- Newton (Correct answer)
- Joule
- Watt
- Pascal
Correct answer: Newton
The Newton (N) is the SI unit of force, defined as the force needed to accelerate 1 kg at 1 m/s².
Question 2: Which of the following best describes a physical change?
- Burning wood
- Rusting iron
- Cutting paper (Correct answer)
- Baking a cake
Correct answer: Cutting paper
Cutting paper changes only the shape, not the chemical composition, making it a physical change.
Question 3: What happens to the speed of a wave as it moves from water into air?
- It increases
- It decreases (Correct answer)
- It stays the same
- It doubles
Correct answer: It decreases
Sound waves travel slower in air than in water because air is less dense, reducing particle collision frequency.
Question 4: An object at rest will remain at rest unless acted upon by an unbalanced force. This is Newton's:
- Second Law
- Third Law
- First Law (Correct answer)
- Law of Gravitation
Correct answer: First Law
Newton's First Law, also called the Law of Inertia, states that an object at rest stays at rest unless acted on by a net force.
Question 5: Which type of energy is stored in a stretched rubber band?
- Kinetic energy
- Thermal energy
- Elastic potential energy (Correct answer)
- Chemical energy
Correct answer: Elastic potential energy
A stretched rubber band stores elastic potential energy due to its deformation.
Question 6: What is the relationship between mass and weight?
- They are the same thing
- Weight = Mass × Gravity (Correct answer)
- Mass = Weight × Gravity
- They are unrelated
Correct answer: Weight = Mass × Gravity
Weight is the gravitational force on an object, calculated as W = mg where g is gravitational acceleration.
Stemscopes Exam Physical Science 1
What is the SI unit of force?