Tag: measurement of properties

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Questions Related to measurement of properties

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

Name and unit are listed, which is NOT correctly written?

  1. Torr and pressure

  2. Mass and grams

  3. Heat energy and kilopascals

  4. Volume and milliliter

  5. Temperature and Kelvin
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Unit of Heat energy is joule ($J$) not kilopascals. kilopascal is unit for pressure.


Hence the correct option is C.

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

298 K is approximately what temperature in degrees Celsius?

  1. $25^oC$
  2. $24^oC$
  3. $29^oC$
  4. $27^oC$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Zero on the Celsius scale $(0^0C)$ is now defined as the equivalent to $273.15K$, with a temperature difference of $1^0C$ equivalent to a difference of $1K$, meaning the unit size in each scale is the same.

$T _k=T _c+273.15$
$T _k=$Temperature in kelvin.

$T _c=$Temperature in celsius.
$T _c=298-273=25^0C$.Option A 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

Prefix giga means:

  1. $10^{-9}$
  2. $10^{9}$
  3. $10^{6}$
  4. $10^{-6}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The prefix of ${ 10 }^{ -9 }=$ nano

                      ${ 10 }^{ 9 }=$ giga
                      ${ 10 }^{ 6 }=$ mega
                      ${ 10 }^{ -6 }=$ micro
Therefore, $(B)$ is the correct answer.

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 prefix of $10^{18}$ is:

  1. giga

  2. exa

  3. kilo

  4. nano

  5. mega
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The prefix of ${ 10 }^{ 3 }=$ kilo

                       ${ 10 }^{ 6 }=$ mega
                       ${ 10 }^{ 9 }=$ giga
                       ${ 10 }^{ 18 }=$ exa
Therefore, the prefix of ${ 10 }^{ 18 }$ is exa

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

SI unit of energy is: 

  1. $kg\, m^2 s^{-2}$
  2. $kg\, m^{-1} s^{2}$
  3. $kg\, m^2 s^{-1}$
  4. $kg\, m^2 s^{2}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The power required to do work by the application of force is energy.

Energy has same unit as that of work.
$\therefore$ S.I unit of Energy is $kgm^2 s^{-2}$

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

$298 K$ is what temperature in Fahrenheit?

  1. $76.73F$
  2. $80F$
  3. $75F$
  4. $27F$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

${ T } _{ K }={ (T } _{ F }+459.67)\times \frac { 5 }{ 9 } \ \Rightarrow 298={ (T } _{ F }+459.67)\times \frac { 5 }{ 9 } \ \Rightarrow \frac { 298\times 9 }{ 5 } -459.67={ T } _{ F }\ \Rightarrow { T } _{ F }=536.4-459.67={ 76.73 }^{ 0 }F$

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 amount of heat energy released when a fuel burns completely is called calorific value.

  1. True

  2. False

  3. Nither

  4. Either
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
$\text{Calorific value= heat released per kg of fule}$

$\text{The amount of heat energy released when a one kilogram of fuel burns completely is called calorific value.}$