Physics · Science General

Units and Measurement

1,044 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

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.

Multiple choice

A volt is a unit of electric:

  1. strength

  2. pressure

  3. frequency

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

A volt is the unit of electrical pressure that pushes current through a conductor. Amps measure strength (flow), and ohms measure resistance.

Multiple choice

An amp is a unit of electric:

  1. strength

  2. pressure

  3. frequency

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

An amp (ampere) is the unit that measures the strength or volume of an electrical current flowing through a conductor. Volts measure pressure, and ohms measure resistance.

Multiple choice

What does an Astronomical Unit represent?

  1. The distance from Los Angeles to New York City

  2. The average distance from Earth to Sun

  3. The size of the Milky Way galaxy

  4. The distance from Earth to the Mon
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An Astronomical Unit (AU) is defined as the average distance between the Earth and the Sun, which is approximately 93 million miles.

Multiple choice

mm Hg stands for

  1. milliliters of mercury

  2. millimeters of mercury

  3. millimeters of hercules

  4. millimeters of human growth hormone
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In the context of blood pressure measurement, mmHg stands for millimeters of mercury. This unit reflects the height of a mercury column that the blood pressure can support.

Multiple choice

Which is NOT a Base Unit

  1. Current - A

  2. Voltage - V

  3. Mass- Kg

  4. Temperature - K
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The SI base units are mass (kg), length (m), time (s), current (A), temperature (K), amount of substance (mol), and luminous intensity (cd). Voltage is a derived unit (J/C or W/A).

Multiple choice

The SI unit of force is:

  1. Metre

  2. Pascal

  3. Watt

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

The SI unit of force is the Newton (N), named after Sir Isaac Newton. It is defined as the force required to accelerate a 1 kg mass at 1 m/s^2.