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 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

Which quantities are measured in the same unit?

  1. energy, power and work

  2. energy and power, but not work

  3. energy and work, but not power

  4. power and work, but not energy
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Quantity             Dimension
Energy              $ML^2T^{-2}$
Work                  $ML^2T^{-2}$
Power                 $ML^2T^{-3}$

So, the dimension of energy and work is same but different to power.
Option (C) is correct.
Multiple choice physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

Which of the Quantity consists of unit as kg-m/sec ?

  1. Speed

  2. Momentum

  3. Acceleration

  4. Impulse
Reveal answer Fill a bubble to check yourself
B,D Correct answer
Explanation

1.  For Speed :

    $v = \dfrac{distance}{time} = m/sec$

2. For Momentum : 
   $P = m \times v$

   Units :  $kg - m/ sec$

3. For Acceleration :
    $a = \dfrac{\Delta v}{\Delta t}=m/{sec}^2$

4. For Impulse :
    $I =F\times \Delta t = \Delta p$
     Units : $N-sec  = (kg-m/{sec}^2) \times sec = kg-m/sec$

From above we can say that $Momentum$ and $Impulse$ have same unit as kg-m/sec.