General Science Practice Test 6

Correct answer: A — protons and neutrons.

The mass number (A) of an atom is defined as the sum of the number of protons and neutrons present in its nucleus.

Correct answer: C — newton (N).

The newton (N) is the SI unit of force, named after Sir Isaac Newton, and is defined as 1 kg·m/s².

Correct answer: B — Liquid

Liquids have a fixed (definite) volume, but they take the shape of whatever container they are placed in.

Correct answer: C — Radio waves

Radio waves have the longest wavelengths and lowest frequencies in the electromagnetic spectrum, while gamma rays have the shortest wavelengths.

Correct answer: C — Compound

A compound is a pure chemical substance composed of two or more different elements held together by chemical bonds in fixed chemical proportions.

Correct answer: B — watt

The watt (W) is the SI unit of power, representing work done or energy transferred at the rate of one joule per second $$(1\text{ W} = 1\text{ J/s})$$

Correct answer: B — Like charges repel.

According to electrostatic principles, like electrical charges (e.g., negative and negative) exert a repulsive force on each other.

Correct answer: C — convection

Convection is the primary process of heat transfer in fluids driven by density differences, causing warm, less dense fluid to rise and cooler, denser fluid to sink.

Correct answer: B — Deposition

Deposition is the thermodynamic phase transition in which a gas transforms directly into a solid upon energy loss, bypassing the liquid phase.

Correct answer: C — Zeroth Law of Thermodynamics

The Zeroth Law of Thermodynamics establishes the concept of temperature as a fundamental property and defines thermal equilibrium across multiple systems.