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

Which of the following is not a basic physical quantity?

  1. Length

  2. Force

  3. Time

  4. Amount of substance
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The physical property of a body, substance or phenomenon that can be quantified by measurement is defined as a physical quantity.

There are seven fundamental physical quantities viz. time, length, mass, amount of substance, luminous intensity, temperature, and electric current.
Here force is a derived unit.
Thus the correct answer is force.

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

Energy spent in kilowatt-hour $=\cfrac {volt \times...........\times......}{1000}$.

  1. ampere, hour

  2. ohm,min

  3. ampere,min

  4. joule,hour
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Energy = Work done $(in\ Watt) =  Power\times time = Voltage \times current \times time$


$Work\ done\ (in\ kilowatt) = \dfrac{(Voltage\times current\times time)}{ 1000}$

$Or\ work\ done\ (in\ kilowatt) = \dfrac{(Volt\times ampere\times hour)}{ 1000}$

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

Mark the conversion factor which is not correct.

  1. 1 atm $= 1.01325 \times 10^5 \ Pa$
  2. 1 metre $= 39.37\ inch$
  3. 1 litre $= 10^{-3}\ m^3$
  4. 1 inch $= 3.33\ cm$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A. 1 atm = $1.01325 \times 10^5\ Pa$

B. 1 metre = $39.37\ inches$
C. 1 litre = $10^{−3}\ m^3$
D. 1 inch = $2.54\ cm$
option D 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

If $T _1$ and $T _2$ are two temperatures, which of the following expressions will yield the same value whether both temperatures are given in Celsius or Kelvin?

  1. $T _1+T _2$
  2. $T _1-T _2$
  3. $T _1\times T _2$
  4. $\dfrac{T _1}{T _2}$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Temperature differences are the same in both Celsius and Kelvin scales because the size of one degree Celsius is equal to the size of one Kelvin. Thus, T1 - T2 remains constant regardless of the scale used.

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

Which of the following is the correct value of $R$ in $SI$ units?

  1. $0.083$ $bar$ $dm^{3}K^{-1}mol^{-1}$
  2. $1.98\ cal K^{-1}mol^{-1}$
  3. $8.314\times 10^{7} erg K^{-1}mol^{-1}$
  4. $8.314 J\ K^{-1}mol^{-1}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$R$ is called as universal gas constant or molar gas constant.

              $R=0.0821\quad L\quad atm\quad { mol }^{ -1 }{ k }^{ -1 }\ R=0.0831\quad { dm }^{ 3 }bar\quad { mol }^{ -1 }{ k }^{ -1 }\ R=8.314\quad J\quad { mol }^{ -1 }{ k }^{ -1 }\ R=8.314\times { 10 }^{ 7 }erg\quad { mol }^{ -1 }{ k }^{ -1 }\ R=1.98\quad Cal\quad { mol }^{ -1 }{ k }^{ -1 }$
The $S.I$ units of molar gas constant $(R)$ is $J\quad { mol }^{ -1 }{ k }^{ -1 }$.
$\therefore \quad R=8.314\quad J\quad { mol }^{ -1 }{ k }^{ -1 }$ is the correct answer.