MTTC Physical Science

Question 1

Which of the following best describes the law of conservation of mass?

Accepted Answer

In a chemical reaction, the total mass of reactants equals the total mass of products

Answer

Mass is created during a chemical reaction

Answer

Mass disappears when substances are burned

Answer

Mass only applies to solids, not gases

Question 2

A student observes that iron rusts when exposed to oxygen and water. This is best classified as a:

Accepted Answer

Chemical change

Answer

Physical change

Answer

Nuclear change

Answer

Phase change

Question 3

Which of Newton's laws of motion states that for every action there is an equal and opposite reaction?

Accepted Answer

Third law

Answer

First law

Answer

Second law

Answer

Law of universal gravitation

Question 4

What type of energy is stored in the chemical bonds of food?

Accepted Answer

Chemical potential energy

Answer

Kinetic energy

Answer

Nuclear energy

Answer

Thermal energy

Question 5

Which best explains why metals are good conductors of electricity?

Accepted Answer

Metals have free electrons that can move easily through the material

Answer

Metal atoms are very heavy

Answer

Metals have tightly bound electrons that resist movement

Answer

Metal atoms are closely packed in a lattice

Question 6

A teacher demonstrates that sound cannot travel through a vacuum by placing a ringing alarm inside a sealed jar and pumping out the air. What concept does this illustrate?

Accepted Answer

Sound requires a medium to travel through

Answer

Sound is a transverse wave

Answer

Light travels at 3×10⁸ m/s

Answer

Sound has a lower frequency than visible light