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

The unit of resistance in the International System of Units (SI) is:

  1. Ohm (Ω)

  2. Volt (V)

  3. Ampere (A)

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

The unit of resistance in the SI system is the Ohm (Ω), named after the German physicist Georg Ohm. It represents the resistance offered by a conductor to the flow of electric current.

Multiple choice

What is the SI unit of induced electromotive force (EMF)?

  1. Volt (V)

  2. Ampere (A)

  3. Tesla (T)

  4. Weber (Wb)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The SI unit of induced electromotive force (EMF) is the volt (V).

Multiple choice

What is the SI unit of magnetic flux?

  1. Weber (Wb)

  2. Tesla (T)

  3. Ampere (A)

  4. Volt (V)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The SI unit of magnetic flux is the weber (Wb).

Multiple choice

What is the SI unit of absorbance?

  1. Absorbance unit (AU)

  2. Molar absorptivity (ε)

  3. Extinction coefficient (k)

  4. Transmittance (T)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The SI unit of absorbance is the absorbance unit (AU).

Multiple choice

What is the SI unit of angular momentum?

  1. kg m^2/s

  2. J s

  3. N m

  4. rad/s
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Angular momentum is a vector quantity that describes the rotational motion of an object. Its SI unit is kilogram meters squared per second (kg m^2/s).

Multiple choice

Which of the following is a unit of angular momentum?

  1. N m

  2. J s

  3. kg m^2/s

  4. rad/s
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The SI unit of angular momentum is kilogram meters squared per second (kg m^2/s).

Multiple choice

The unit of magnetic flux is:

  1. Weber (Wb)

  2. Tesla (T)

  3. Ampere (A)

  4. Volt (V)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The unit of magnetic flux is the Weber (Wb), which is defined as the magnetic flux through a surface of area 1 square meter perpendicular to a uniform magnetic field of 1 Tesla.

Multiple choice

What is the SI unit of inductance?

  1. Henry (H)

  2. Farad (F)

  3. Ohm (Ω)

  4. Tesla (T)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The SI unit of inductance is the henry (H), named after the American physicist Joseph Henry. It is defined as the inductance of a circuit in which an electromotive force of one volt is produced when the current changes at a rate of one ampere per second.

Multiple choice

What is the unit of magnetic flux?

  1. Weber (Wb)

  2. Tesla (T)

  3. Henry (H)

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

The unit of magnetic flux is the weber (Wb). It is defined as the magnetic flux produced by one magnetic pole of strength one ampere-meter.

Multiple choice

What is the SI unit of displacement?

  1. Meter (m)

  2. Kilometer (km)

  3. Centimeter (cm)

  4. Inch (in)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The SI unit of displacement is the meter (m), which is the standard unit of length in the International System of Units (SI).

Multiple choice

What is the SI unit of velocity?

  1. Meter per second (m/s)

  2. Kilometer per hour (km/h)

  3. Centimeter per second (cm/s)

  4. Inch per second (in/s)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The SI unit of velocity is the meter per second (m/s), which represents the rate of change of displacement with respect to time.

Multiple choice

What is the SI unit of acceleration?

  1. Meter per second squared (m/s^2)

  2. Kilometer per hour squared (km/h^2)

  3. Centimeter per second squared (cm/s^2)

  4. Inch per second squared (in/s^2)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The SI unit of acceleration is the meter per second squared (m/s^2), which represents the rate of change of velocity with respect to time.

Multiple choice

What is the SI unit of luminous intensity?

  1. Candela

  2. Lumen

  3. Watt

  4. Lux
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 particular direction.

Multiple choice

What is the SI unit of illuminance?

  1. Candela

  2. Lumen

  3. Lux

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

Illuminance (E), measured in lux (lx), is the SI unit that describes the amount of light incident on a surface per unit area.

Multiple choice

What is the SI unit of radiant intensity?

  1. Watt

  2. Lumen

  3. Candela

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

Radiant intensity (I), measured in watts per steradian (W/sr), describes the power of electromagnetic radiation emitted by a source in a particular direction.