Tag: matter around us

Questions Related to matter around us

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

Show answer
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.

The prefix of $10^{18}$ 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. giga

  2. exa

  3. kilo

  4. nano

  5. mega

Show answer
Correct Option: B
Explanation:

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

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

SI unit of 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. $kg\, m^2 s^{-2}$

  2. $kg\, m^{-1} s^{2}$

  3. $kg\, m^2 s^{-1}$

  4. $kg\, m^2 s^{2}$

Show answer
Correct Option: A
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 $kgm^2 s^{-2}$

Which of the following is the correct unit for measuring nuclear radii?

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

  1. Micron

  2. Millimetre

  3. Angstrom

  4. Fermi

Show answer
Correct Option: D
Explanation:

$\text{Nuclear radii are measured in Fermi ie. }$$10^{-15}$