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 zoology living and non living characteristics of life attributes of living organisms signs of life biology : an introduction living world and classification

The structural unit of a nonliving being is

  1. Electron

  2. Neutron

  3. Cell

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

Non-living beings are made up of a single or combination of molecules repeated in a sequence or randomly arranged. A molecule is a group of two or more atoms bound by chemical bonds. A few examples of non- living being is water, table, ground.

So, the correct answer is 'Molecule'.

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

The unit of power is:

  1. $Kilowatt$
  2. $kWhv$
  3. $dyne$
  4. $joule$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Power is defined as the work done per unit time. So to get the SI unit of power :

$Power=\dfrac{Work}{Time}$

SI unit of Work $=$ Joules

SI unit of Time $=$ second

So S.I. unit of power $=\dfrac{Joule}{Second}=Watt$

$1000\,Watt=1\,Kilowatt$

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

Three of these quantities have the same unit. Which quantity has a different unit ?

  1. $\dfrac{distance}{energy}$
  2. $force$
  3. $power\times time$

  4. rate of change of momentum
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Force, power times time (energy), and rate of change of momentum (force) all have units of Newtons or Joules. Distance/energy has units of m/J, which is different from the others.

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

Pascal is a unit of 

  1. Pressure

  2. Force

  3. Linear momentum

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

The pascal $(Pa)$ is the SI derived unit of pressure used to quantify internal pressure, stress, Young's modulus and ultimate tensile strength. The unit, named after Blaise Pascal, is defined as one newton per square metre.

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

The $SI$ unit of specific heat capacity is $J\ kg^{-1}K^{-1}$.
What is the unit of specific heat capacity expressed in $SI$ base units?

  1. $ms^{-2}K^{-1}$
  2. $kgms^{-2}K^{-1}$
  3. $m^{2}s^{-2}K^{-1}$
  4. $kg m^{2}s^{-2}K^{-1}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
we know that J is the unit of work done 
So,
$J = kgm^2s^{-2} $
$\implies Jkg^{-1}K^{-1}= kgm^2s^{-2} \times kg^{-1}K^{-1}$
$\implies Jkg{-1}K^{-1}= m^2s^{-2}K^{-1}$
 
So, option C is correct answer.