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

What is the SI unit of radiance?

  1. Watt

  2. Lumen

  3. Candela

  4. Watt per square meter per steradian
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Radiance (L), measured in watts per square meter per steradian (W/(m²⋅sr)), describes the radiant power emitted by a surface per unit area per unit solid angle.

Multiple choice

What is the basic unit of knitting?

  1. Row

  2. Stitch

  3. Loop

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

In knitting, a stitch is the basic unit of construction, created by passing a loop of yarn through another loop on the needle.

Multiple choice

What is the SI unit of force?

  1. Newton

  2. Kilogram

  3. Meter
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The SI unit of force is the Newton (N), named after Sir Isaac Newton.

Multiple choice

What is the SI unit of mass?

  1. Newton

  2. Kilogram

  3. Meter
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The SI unit of mass is the kilogram (kg).

Multiple choice

What is the SI unit of acceleration?

  1. Newton

  2. Kilogram

  3. Meter per second squared
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The SI unit of acceleration is the meter per second squared (m/s²).

Multiple choice

What is the SI unit of electric charge?

  1. Coulomb

  2. Ampere

  3. Volt

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

The SI unit of electric charge is the coulomb (C). It is named after the French physicist Charles-Augustin de Coulomb, who made significant contributions to the study of electricity and magnetism.

Multiple choice

What is the SI unit of energy?

  1. Joule

  2. Watt

  3. Newton

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

The SI unit of energy is the joule (J). It is named after the English physicist James Prescott Joule, who made significant contributions to the study of energy and heat.

Multiple choice

What is the SI unit of frequency?

  1. Hertz

  2. Second

  3. Meter

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

The SI unit of frequency is the hertz (Hz). It is named after the German physicist Heinrich Hertz, who made significant contributions to the study of electromagnetic waves.

Multiple choice

What is the SI unit of mass?

  1. Kilogram

  2. Gram

  3. Pound

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

The SI unit of mass is the kilogram (kg). It is defined as the mass of the International Prototype Kilogram, a cylinder of platinum-iridium alloy kept at the International Bureau of Weights and Measures in France.

Multiple choice

What is the SI unit of capacitance?

  1. Farad

  2. Coulomb

  3. Volt

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

The SI unit of capacitance is the farad (F), named after the English physicist Michael Faraday.

Multiple choice

What is the SI unit of length?

  1. Meter

  2. Kilogram

  3. Second

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

The SI unit of length is the meter, which is defined as the distance traveled by light in a vacuum in 1/299,792,458 of a second.

Multiple choice

What is the SI unit of luminous intensity?

  1. Candela

  2. Lumen

  3. Lux

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

The candela (cd) is the SI unit of luminous intensity, which measures the perceived brightness of a light source in a given direction.

Multiple choice

Which unit of measurement is commonly used to express distances in astronomy?

  1. Light-year

  2. Parsec

  3. Astronomical Unit

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

A light-year is the distance light travels in one year, approximately 9.461 trillion kilometers.

Multiple choice

What is the unit of measurement for radiation dose?

  1. Sievert (Sv).

  2. Gray (Gy).

  3. Rad.

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

The unit of measurement for radiation dose is the Sievert (Sv).

Multiple choice

What is the SI unit of surface tension?

  1. Newton per meter (N/m)

  2. Pascal (Pa)

  3. Joule per square meter (J/m^2)

  4. Erg per square centimeter (erg/cm^2)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Surface tension is expressed in units of force per unit length, which is Newton per meter (N/m) in the SI system.