Free Natural Science CLEP Question and Answers

Question 1

As inert gases, Nobel gases do not readily react. This is due to

Accepted Answer

Their number of neutrons is equal to number of protons

Answer

Noble gases are inert because they possess a full outer electron shell (valence shell), typically with eight electrons (octet rule, or two for helium), making them exceptionally stable and unreactive. This stable electron configuration means they have no tendency to gain, lose, or share electrons in chemical bonds. While the provided answer A refers to the balance of protons and neutrons, this aspect relates to nuclear stability and isotope characteristics, not the chemical inertness of an atom.

Question 2

Which of the following is not found in animal cells but is present in plant cells?

Accepted Answer

Cell wall

Answer

Plant cells are distinguished from animal cells by several unique structures, most notably the cell wall. The cell wall is a rigid outer layer that provides structural support, protection, and maintains the cell's shape, a feature absent in animal cells. Both plant and animal cells possess a cell membrane, cytoplasm, and a nucleus.

Question 3

A measure of an electric charge is a

Accepted Answer

Coulombs

Answer

A Coulomb (C) is the standard unit of electric charge in the International System of Units (SI). It quantifies the amount of electricity transferred by a constant current of one ampere in one second. Amperes measure electric current, Volts measure electric potential difference, and Ohms measure electrical resistance.

Question 4

Plant ovaries form as they develop.

Accepted Answer

Fruit

Answer

In flowering plants, the ovary is the part of the pistil that contains the ovules. After successful fertilization, the ovules develop into seeds, and the surrounding ovary wall matures and ripens into a fruit. The fruit's primary biological function is to protect the developing seeds and facilitate their dispersal.

Question 5

An element's isotopes differ in the number of

Accepted Answer

Neutrons

Answer

Isotopes are atoms of the same element that share the same number of protons, which defines their atomic number and chemical identity. However, isotopes differ in their number of neutrons, leading to variations in their atomic mass. This difference in neutron count is the defining characteristic that distinguishes one isotope from another.

CLEP Practice Test

CLEP Practice Test

Free Natural Science CLEP Question and Answers