ASVAB General Science: Physics and Chemistry Concepts 3

Question 1

Which of the following is an example of a chemical change?

Accepted Answer

Iron rusting

Answer

Iron rusting is a chemical change because it produces a new substance (iron oxide) through oxidation.

Question 2

What is the unit of electrical resistance?

Accepted Answer

Ohm

Answer

Electrical resistance is measured in ohms (Ω), as defined by Ohm's law (V = IR).

Question 3

According to Newton's Third Law, when you push a wall, the wall pushes back with:

Accepted Answer

An equal and opposite force

Answer

Newton's Third Law states every action has an equal and opposite reaction, so the wall exerts an equal force back.

Question 4

What is the atomic number of an element?

Accepted Answer

The number of protons in the nucleus

Answer

The atomic number equals the number of protons in the nucleus and uniquely identifies each element.

Question 5

Which state of matter has a definite volume but no definite shape?

Accepted Answer

Liquid

Answer

Liquids have a definite volume but take the shape of their container, unlike solids (fixed shape) or gases (no fixed volume).

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