Tag: measurement of properties

Questions Related to measurement of properties

Which of the following is not a basic physical quantity?

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

  1. Length

  2. Force

  3. Time

  4. Amount of substance

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Correct Option: B
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.

The commercial unit of electrical energy is :
chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

  1. Watt

  2. Kilo Watt hour

  3. Watt/ hour

  4. Ohm

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Correct Option: B
Explanation:

The kilowatt-hour is commonly used as a billing unit for energy delivered to consumers by electric utilities.

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

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

  1. ampere, hour

  2. ohm,min

  3. ampere,min

  4. joule,hour

Show answer
Correct Option: A
Explanation:

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


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

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

Which of the following is wrong?

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

  1. 1 inch = 2.54 cm

  2. 1 foot = 3.305 m

  3. 1 mile = 1.609 km

  4. 1 lb. = 453.59 gm

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Correct Option: B
Explanation:

Answer is option $B$. 

Since $1$ $foot=0.3048m$

Mark the conversion factor which is not correct.

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

  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 $= 3.33\ cm$

Show answer
Correct Option: D
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

Atomic radius is expressed in the _______ units.

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

  1. angstrom

  2. cm

  3. m

  4. nm

Show answer
Correct Option: A
Explanation:

Atomic radius is usually expressed in Angstrom units. It is because the size of atom is very small. It is equivalent to $1\times {10}^{-10}$metres.

Weight of diamonds are measured in________.

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

  1. aunce

  2. Kg

  3. carats

  4. pounds

Show answer
Correct Option: C
Explanation:

One carat is equal to exactly $0.2$ grams.

The word 'carat' came from the "carob" seed, which was used by diamond traders as the original unit.

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?

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

  1. $T _1+T _2$

  2. $T _1-T _2$

  3. $T _1\times T _2$

  4. $\dfrac{T _1}{T _2}$

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Correct Option: B

Which of the following has the highest numeric value?

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

  1. $100$ Tm

  2. $1000$ Gm

  3. $10^4$ mm

  4. $10^6$ nm

Show answer
Correct Option: A
Explanation:

$100\ Tm=100000\ Gm$

$1000\ Gm$
$10^4\ mm=1\times10^{-10}\ Gm$
$10^6\ nm=1\times10^{-12}\ Gm$

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

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

  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. $8.314 J\ K^{-1}mol^{-1}$

Show answer
Correct Option: D
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.