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 chemistry basic concepts of chemistry measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

The S.I unit of atmospheric pressure is :

  1. $L\ atm$
  2. $N/m$
  3. $Pascal$

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The S.I unit of atmospheric pressure is $N/m^2$ or $Pascal$.

           $1\quad Pascal =1N/m^2$
           $1\quad atm =101325\quad Pascal$
           $1\quad bar =10^5\quad Pascal$

Multiple choice chemistry basic concepts of chemistry measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

What is the SI unit of mass? 

  1. kg

  2. LBS

  3. Pounds

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • SI unit definition is a unit of measurement that is a universally accepted system used for scientific and technical work all over the world.
  • The kilogram is the SI base unit of mass and is equal to the mass of the international prototype of the kilogram, a platinum-iridium standard that is kept at the International Bureau of Weights and Measures (BIPM).

Multiple choice chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

Unit of luminous intensity is:

  1. mole

  2. candela

  3. kelvin

  4. ampere
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle.


Based on the luminosity function, a standardized model of the sensitivity of the human eye. 
The SI unit of luminous intensity is candela(cd).

So, option ( B ) is correct.

Multiple choice chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

The symbol of S.I unit of amount of substance is:

  1. mole

  2. density

  3. equivalent weight

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

Mole is used to represent the amount of a substance. For an element or a compound, mole is given by


$n=\dfrac{Weight\ in\ grams}{Molecular\ Weight}$

Its SI unit is $mole$.

Multiple choice chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

S.I unit for the coefficient of viscosity is equal to?

  1. $Nm^{-1}s$
  2. $Pa s^{-1}$
  3. $Nm^{-2} s$
  4. $Pa s^{-2}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The SI unit for the coefficient of viscosity (dynamic viscosity) is the Pascal-second (Pa s). Since 1 Pascal = 1 N/m^2, the unit is (N/m^2) * s, which is N m^-2 s.

Multiple choice chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

The greatest of the combination is?

  1. $(9.0\pm 0.3)$ S.I unit
  2. $(9.0\pm 0.2)$ S.I unit
  3. $(9.0\pm 0.1)$ S.I unit
  4. $(9.0\pm 0.5)$ S.I unit
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The question asks for the 'greatest of the combination', which refers to the uncertainty. The value with the largest absolute uncertainty (0.5) represents the least precise measurement.

Multiple choice chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

The SI unit for force is:

  1. Torr

  2. Newton

  3. Joule

  4. Dyne
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Force is the product of mass and acceleration

 $\therefore$ Force $=$ Mass $\times$ acceleration
The S.I unit of force is $kg.m/s^2$ or Newton
 $1$ Newton $= 10^5$ Dyne

Option $B$ is the correct answer.