Stemscopes Exam Physical Science

Question 1

What is the SI unit of force?

Accepted Answer

Newton

Answer

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?

Accepted Answer

Cutting paper

Answer

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?

Accepted Answer

It decreases

Answer

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:

Accepted Answer

First Law

Answer

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?

Accepted Answer

Elastic potential energy

Answer

A stretched rubber band stores elastic potential energy due to its deformation.

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