Physics · Science General

Units and Measurement

998 Questions

Master the fundamentals of physics with these practice questions on units and measurement. The topics include fundamental SI units, derived quantities, and specific units for power, force, and light. These questions are essential for building a strong foundation for competitive exams.

SI fundamental unitsUnits of powerDerived quantities unitsThermal energy unitsVolume measurement unitsElectric current units

Units and Measurement Questions

Multiple choice

In what unit are forces measured?

  1. meters per second

  2. pounds

  3. Newtons

  4. Einsteins
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The standard SI unit for force is the Newton (N), named after Sir Isaac Newton. Pounds are a unit of force in the imperial system, but Newtons are the scientific standard.

Multiple choice

In what unit of measurement is frequency expressed?

  1. hertz (Hz)

  2. Joules (J)

  3. Newtons (N)

  4. Amperes (amp)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Frequency is defined as the number of cycles per second, and this unit is named the hertz (Hz) in honor of Heinrich Hertz. Joules measure energy, Newtons measure force, and Amperes measure current.

Multiple choice

SI unit of impulse

  1. kg2 ⋅ m/s

  2. kg ⋅ m2/s

  3. J/s

  4. kg ⋅ m/s
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Since impulse is force (kg * m/s^2) multiplied by time (s), the units are kg * m/s.

Multiple choice

SI unit of momentum

  1. kg2 ⋅ m/s

  2. kg ⋅ m/s

  3. J/s

  4. kg ⋅ m2/s
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Since momentum is mass times velocity, the SI unit is the unit of mass (kg) multiplied by the unit of velocity (m/s), resulting in kg m/s.

Multiple choice

What is energy measured in?

  1. Celsius

  2. Kilocalories

  3. Grams

  4. Decibels
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In nutrition, the energy content of food is measured in kilocalories (kcal) or kilojoules (kJ). Celsius measures temperature, grams measure mass, and decibels measure sound intensity.

Multiple choice

What is the unit of mass for an atom?

  1. kg

  2. g

  3. cm

  4. amu
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The atomic mass unit (amu) is specifically defined to express the extremely small masses of atoms and subatomic particles. Grams and kilograms are metric units of mass used for macroscopic objects, while centimeters measure length.

Multiple choice

What is the unit for Volume?

  1. cm2

  2. grams

  3. Liters

  4. Pascals
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Volume is the amount of three-dimensional space an object occupies. Liters (or milliliters) are standard units for measuring the volume of liquids and gases.

Multiple choice

Pressure is measured in which unit?

  1. grams

  2. g/cm3

  3. Pascals or kPa

  4. Milliliters
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Pressure is defined as force applied over an area. The SI unit for pressure is the Pascal (Pa), and kilopascals (kPa) are commonly used multiples.

Multiple choice

What is the unit for Mass

  1. gram

  2. centimeter

  3. Pascals

  4. liter
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mass is a measure of the amount of matter in an object. The standard base unit for mass in the metric system is the gram (or kilogram).

Multiple choice

The smallest, most fundamental unit of life 

  1. Atom

  2. Molecule

  3. Cell

  4. Element
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The cell is the smallest structural and functional unit of all living organisms. Atoms and molecules are smaller but are not considered alive.

Multiple choice

The basic unit of a chemical element.

  1. Atom

  2. Proton

  3. Neutron

  4. Electron
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An atom is defined as the smallest unit of ordinary matter that forms a chemical element. Protons, neutrons, and electrons are subatomic particles that make up an atom.