NTN Science 3

Question 1

What is the chemical formula for water?

Accepted Answer

H₂O

Answer

Water is composed of two hydrogen atoms bonded to one oxygen atom, giving it the formula H₂O.

Question 2

Which layer of Earth's atmosphere contains the ozone layer?

Accepted Answer

Stratosphere

Answer

The ozone layer, which absorbs harmful UV radiation, is located in the stratosphere.

Question 3

Which of the following is an example of a conductor?

Accepted Answer

Copper wire

Answer

Copper wire is an electrical conductor because it allows electrons to flow freely through it.

Question 4

What is the role of the mitochondria in a cell?

Accepted Answer

Produce energy (ATP) through cellular respiration

Answer

Mitochondria generate ATP through cellular respiration, providing energy for the cell's activities.

Question 5

If a substance has a pH of 2, it is classified as:

Accepted Answer

Strongly acidic

Answer

A pH of 2 indicates a strongly acidic substance; pH 7 is neutral and values above 7 are basic.

NTN - National Testing Network Practice Test