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 physics measurements and units some examples of derived units fundamental and derived quantities fundamental and derived units

Identify the common unit used to measure energy?

  1. Newtons

  2. Joules

  3. Grams

  4. Meters

  5. Liters
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Newton is the unit of force.

Joules is the SI unit of energy. It is equivalent to newton-meter($N-m$).
Grams is a unit of mass.
Meter is the SI unit of distance.
A liter is a unit of volume and equivalent to $dm^3$.

Therefore option $B$ is correct.

Multiple choice physics measurements and units some examples of derived units fundamental and derived quantities fundamental and derived units

Identify the derived quantities among the following.

  1. Gravitational constant

  2. Frequency

  3. Electric charge

  4. Electric current
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

The derived quantities are the one which depends on the other fundamental quantities for their representation. Among the following quantities, an electric current is a fundamental quantity whereas gravitational constant, frequency and electric charge are the derived quantities.

Multiple choice physics measurements and units some examples of derived units fundamental and derived quantities fundamental and derived units

Which of the following quantities has its unit as newton second?

  1. Energy

  2. Torque

  3. Momentum

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

Dimensional formula of newton second $=\left[ \dfrac { kgm }{ { S }^{ 2 } } \times S \right] $

$=\left[ { MLT }^{ -1 } \right] $
Dimensional formula of momentum $=\left[ { MLT }^{ -1 } \right] $
Hence, momentum has the unit as $Nsec$.

Multiple choice physics measurements and units some examples of derived units fundamental and derived quantities fundamental and derived units

Among the following identify derived quantities?

  1. Speed

  2. Temperature

  3. Volume

  4. Mass
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Explanation

(A) Speed $\displaystyle = \frac{distance}{time}$ - a derived quantity of length and time.
(B) Temperature - fundamental quantity.
(C) Volume (cube of length) - a derived quantity of length.
(D) Mass - fundamental quantity.

Multiple choice physics measurements and units some examples of derived units fundamental and derived quantities fundamental and derived units

Which of the following is larger unit of density ?

  1. $gm^{-3}$
  2. $gkm^{-3}$
  3. $kgm^{-3}$
  4. $gcm^{3}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
m is the mass of an object divided by its volume. Density often has units of grams per cubic centimeter (g/cm3). Remember, grams is a mass and cubic centimeters is a volume (the same volume as 1 milliliter).
Multiple choice physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

Knot is a measure of:

  1. The speed of ship

  2. The curvature of spherical objects

  3. Solar radiation

  4. Intensity of earthquake shock.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Knot is a measure of the speed of ship. The term knot dates from the 17th century, when sailors measured the speed of their ship by using a device called a "common log".

Hence, option A is correct.