Tag: general introduction: importance and scope of chemistry

Questions Related to general introduction: importance and scope of chemistry

Which is correct option about the prefix centi 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. One thousand

  2. One thousandth

  3. One hundred

  4. One hundredth

  5. One million

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Correct Option: D
Explanation:

Selected Prefixes and Their Meanin

 G  billions (U.S.)  giga
 M  Million mega 
 k  thousand  kilo
 h*  hundred  hecto*
 da*  ten  deka*
 d*  tenth  deci*
 c*  hundredth  centi*
 m*  thousandth  milli
 $\mu$  millionth  micro
 n  billionth (U.S.)  nano

$10^{-12}$ is called :

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

  1. Terra

  2. Pico

  3. Giga

  4. Mega

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Correct Option: B
Explanation:

$10^{-12}$ is called as pico.

Which temperature is hottest?

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

  1. $17^oC$

  2. $58^o F$

  3. $290 K$

  4. $16^o C$

Show answer
Correct Option: A
Explanation:
Relation between celsius kelvin and fahrenheit scale.
${ T } _{ C }=\frac { 5 }{ 9 } ({ T } _{ F }-32){ =T } _{ K }-273.15$

$17^0C=17^0C$
$58^0F=\frac {58-32} {1.8}=14.44^0C$
$290K={290-273.15}^0C=16.85^0C$

$16^0C=16^0C$

$17^0C$ is hotter.
Option A is correct.

SI unit for time 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. minutes

  2. hours

  3. seconds

  4. days

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Correct Option: C
Explanation:

SI unit of time is seconds.

Which of the following is not a conversion factor?

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

  1. 12 eggs = 1 dozen

  2. 30 lbs.

  3. 60 miles per hour

  4. 1 km/1,000 m

  5. 4 apples per week

Show answer
Correct Option: C,D,E
Explanation:

Conversion factor involves same units. For example, length can be converted to length only, time to time only, etc.

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

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

  1. Torr and pressure

  2. Mass and grams

  3. Heat energy and kilopascals

  4. Volume and milliliter

  5. Temperature and Kelvin

Show answer
Correct Option: C
Explanation:

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


Hence the correct option is C.

Convert $48.50mL$ to liters.

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

  1. $0.4850L$

  2. $4850L$

  3. $0.04850L$

  4. $0.00004850L$

  5. $4.850L$

Show answer
Correct Option: C
Explanation:

We know that the 1 mL is equals to 0.001 L

hence $48.50$ mL is equals to $48.50$ multiplied by $0.001$ which comes $0.04850$ L.
Option C is correct answer.

Unit of J $pa^{-1}$ is equivalent to:

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

  1. $m^3$

  2. $cm^3$

  3. $dm^3$

  4. none of these

Show answer
Correct Option: A
Explanation:

J/Pa =  Work/Pressure =  Nm/Nm-2 = m3

298 K is approximately what temperature in degrees Celsius?

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

  1. $25^oC$

  2. $24^oC$

  3. $29^oC$

  4. $27^oC$

Show answer
Correct Option: A
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.

Prefix giga means:

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

  1. $10^{-9}$

  2. $10^{9}$

  3. $10^{6}$

  4. $10^{-6}$

Show answer
Correct Option: B
Explanation:

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

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