Tag: general introduction: importance and scope of chemistry

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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
$\text{Calorific value= heat released per kg of fule}$

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