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 pressure in liquids and gases pressure dependence on force and area concept of pressure pressure on surface

Which of the following are units used to measure pressure?

  1. $kg$ ${m}^{-2}$

  2. pascal (Pa)
  3. newton per ${m}^{2}$

  4. joules
Reveal answer Fill a bubble to check yourself
B,C Correct answer
Explanation

The pressure is the force per unit area. So, $P=F/A$

The unit of force is newton (N) and unit of area is $m^2$. 
Thus, the unit of pressure is $N/m^2$. 
Pascal is the SI unit of pressure. It is equal to one newton divided by one square meter. 

Multiple choice maths how much does it weigh? define weight and units of weight conversion of length measurement (length) basic operations with same units operations involving units of length

${\rm{1}}\,{\rm{g/c}}{{\rm{m}}^{\rm{3}}}$ is equal to____________.

  1. ${\rm{1}}\,{\rm{kg/c}}{{\rm{m}}^{\rm{3}}}$
  2. ${\rm{1}}{{\rm{0}}^3}\,{\rm{kg/}}{{\rm{m}}^{\rm{3}}}$
  3. ${\rm{1}}{{\rm{0}}^{ - 2}}\,{\rm{kg/c}}{{\rm{m}}^{\rm{3}}}$
  4. ${\rm{1}}{{\rm{0}}^{ - 3}}\,{\rm{kg/c}}{{\rm{m}}^{\rm{3}}}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

We have,

$1\ g/cm^3$

Since,
$1000\ g=1\ kg$
$1\ g=10^{-3} \ kg$

So,

$1\ g/cm^3 =10^{-3}\ kg/cm^3$

Hence, this is the answer.

Multiple choice physics energy : forms and sources concept of energy energy for everything forms of energy

kg $m^2S^{-2}$ represents the unit of :

  1. kinetic energy only

  2. work done only

  3. potential energy only

  4. all the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Work done is same as energy which is measured in joules. 1 joule is same as 1 newton expanded over 1 meter which is force multiplied by distance.

Force is defined as mass into acceleration. Hence if we accelerate 1kg mass by 1m/s$^{2}$ in a straight line for a distance of 1 meter, we have indirectly expanded 1 joule of energy .
Also acceleration is distance per second squared.
Thus we have mass $\ast$ acceleration $ast$ distance which is Kg m$^{2}$ S$^{-2}$.