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 chemistry materials around us and different types of houses materials around us matter and its states different states of matter

 Mass per unit volume can be defined as:

  1. volume

  2. weight

  3. density

  4. matter

  5. none of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mass per unit volume can be defined as density. For example : when 1 g of water has volume of 1 mL, the density of water will be 1 g/mL.
Density $\displaystyle = \dfrac {\text {mass}}{\text {volume}}$

Multiple choice physics learning how to measure measurement of area and volume measurement of volume measurement of area, volume and density

Which is the correct form of expressing SI unit of volume?

  1. $\displaystyle { m }^{ 3 }$
  2. $cubicmetre$
  3. $\displaystyle { metre }^{ 3 }$

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

SI unit of volume is $m^3$ which can also be written as $cubicmetre$ and $metre^3$. It is a big unit, the smaller units are also in use.

Multiple choice physics learning how to measure measurement of area and volume measurement of volume measurement of area, volume and density

Name the unit in which the volume of liquid is generally measured. How can this unit is related to L.

  1. kilogram, 1 litre = 10$^{-6}$ m$^3$
  2. litre, 1 litre = 10$^{-6}$ m$^3$
  3. litre, 1 litre = 10$^{-3}$ m$^3$
  4. litre, 1 litre = 10$^{-3}$ cm$^3$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Volume is generally measured in liter, $1\ liter=10^{-3}m^3$

Multiple choice standardized measurement measurement of physical quantities need of unit for measurement measurements and experimentation physics

The ratio of the C.G.S unit of pressure to the S.I unit of pressure is 10.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
SI unit of pressure is $N/m^2$ and CGS unit of pressure is $dyne/cm^2$.
We know that  $1 \ N = 10^5 \ dyne$  and   $1 \ m  =10^0 \ cm$
ratio of CGS unit to SI unit  $\dfrac{1 \ dyne/cm^2}{N/m^2} = \dfrac{1 \ dyne/cm^2}{10^5 \ dyne/(100)^2 \ cm^2} = \dfrac{1}{10} $
Thus the given statement is false.
Multiple choice standardized measurement measurement of physical quantities need of unit for measurement measurements and experimentation physics

Find the SI unit of the following derived quantities :

Pressure

  1. Pascal

  2. Newton

  3. Kg

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

Given pressure $\displaystyle = \frac{Force}{Area}$
$\therefore$ MKS unit of pressure $\displaystyle = \frac{S.I.  unit \ of \   force}{S.I.  unit \ of \ area} = \frac{kg  m  s^{-2}}{m^2}$
$\displaystyle = \frac{kg.m}{m^2 . s^2} = \frac{kg}{m.s^2}$
$\therefore$ MKS unit of pressure $= kg m^{-1} s^{-2}$
SI unit of pressure is pascal.