Tag: measurements and units

Quizzes (10) Questions (257)

Questions Related to measurements and units

Multiple choice physics measurements and units summary of si units fundamental quantities system of units

Joules / coulomb is the same as....

  1. Watt

  2. ampere

  3. Volt

  4. Ohm
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Joule is a unit for work done and coulomb is the unit for the charge. The potential is defined as the ratio of the work done to the charge and the unit of the potential difference is volt. Hence, one joule per coulomb is equal to the unit of the potential difference. Therefore it will be equal to one Volt.

Multiple choice physics measurements and units summary of si units fundamental quantities system of units

Dimension of $\sqrt { \dfrac { \epsilon _{ 0 } }{ \mu _ 0 }  }$ are

  1. $[ML^2T^{-3}A^{-2}]$
  2. $[M^{-1}L^{-2}T^3A^2]$
  3. $[M^2L^2T^{-3}A^{-2}]$
  4. $[M^{-1}L^2T^3A^2]$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$\sqrt{\dfrac{\varepsilon _0}{\mu _0}}=\sqrt{\dfrac{\varepsilon _0^2}{\mu _0\varepsilon _0 }}=\varepsilon _0c=[M^{-1}L^{-3}T^{4}A^2][LT^{-1}]$
$[M^{-1}L^{-2}T^{3}A^2]$

Multiple choice physics measurements and units summary of si units fundamental quantities system of units

Study the following

List - I List - II
a) Fundamental unit I) rad
b) Derived unit II) Kg-Wt
c) Practical unit III) N
d) Supplementary unit IV) Kg

  1. a-I b-IV c-II d-III

  2. a-IV b-III c-II d-I

  3. a-I b-III c-IV d-I

  4. a-I b-II c-III d-IV
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Fundamental unit $\rightarrow$ $Kg$
Derived unit $\rightarrow$ $N$
Practical unit $\rightarrow$ $Kg-Wt$
Supplementary unit $\rightarrow$ $rad$

Multiple choice physics measurements and units kinds of units fundamental quantities standardized measurement

The SI unit of specific latent heat is 

  1. $Jkg^{-1}K^{-1}$
  2. $J^{0}K^{-1}$
  3. $J kg^{-1}$
  4. $J kgK^{-1}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The specific latent heat of a substance is the quantity of heat energy required to change the state of a unit mass of a substance.

${E} _{L}= ml$

here ${E} _{L}$ is the heat transferred, in joules,m is the mass, in kilograms, and l is the latent heat in joules per kilogram.

The SI unit for specific latent heat is $J{kg}^{-1}$.

Multiple choice physics measurements and units kinds of units fundamental quantities standardized measurement

The specific heat capacity of water in SI unit is :

  1. $4.2 Jg^{-1}K^{-1}$
  2. $42 Jg^{-1}K^{-1}$
  3. $420 J kg^{-1}K^{-1}$
  4. $4200 J kg^{-1}K^{-1}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The specific heat capacity  of a substance is the heat needed to raise

the temperature of 1 kg of the substance by 1K (or by ${1}^{0}C$).
The specific heat capacity of water is $4200 J{kg}^{-1}{K}^{-1}$.

Multiple choice physics measurements and units kinds of units fundamental quantities standardized measurement

The SI unit of thermal capacity is ;

  1. $J\ kg^{-1}\ K^{-1}$
  2. $J^{-1}\ kg\ K^{-1}$
  3. $JK^{-1}$
  4. $J\ kg\ K^{-1}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation


The heat or thermal capacity of a defined system is the amount of heat required to raise the system's temperature by one degree. It is expressed in units of thermal energy per degree temperature.

$q= C\times t$

$C=\dfrac{q}{\triangle t}$

here,$C=$heat or thermal capacity
        $q=$heat required (J)
        $\triangle t={t} _{1}-{t} _{2}$ (K)

so,The S.I. unit of heat or thermal capacity is $J{K}^{-1}$