Tag: measurement of properties

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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 symbol of S.I unit of amount of substance is:

  1. mole

  2. density

  3. equivalent weight

  4. molecular weight
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mole is used to represent the amount of a substance. For an element or a compound, mole is given by


$n=\dfrac{Weight\ in\ grams}{Molecular\ Weight}$

Its SI unit is $mole$.

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 one of the following temperatures is approximately equal to "room temperature ?"

  1. $0\ K$
  2. $293\ K$
  3. $100$ Degree Celsius
  4. $0$ Degree Celsius
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Room temperature is typically defined as approximately 20 to 25 degrees Celsius, which corresponds to roughly 293 to 298 Kelvin.

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

S.I unit for the coefficient of viscosity is equal to?

  1. $Nm^{-1}s$
  2. $Pa s^{-1}$
  3. $Nm^{-2} s$
  4. $Pa s^{-2}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The SI unit for the coefficient of viscosity (dynamic viscosity) is the Pascal-second (Pa s). Since 1 Pascal = 1 N/m^2, the unit is (N/m^2) * s, which is N m^-2 s.

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 greatest of the combination is?

  1. $(9.0\pm 0.3)$ S.I unit
  2. $(9.0\pm 0.2)$ S.I unit
  3. $(9.0\pm 0.1)$ S.I unit
  4. $(9.0\pm 0.5)$ S.I unit
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The question asks for the 'greatest of the combination', which refers to the uncertainty. The value with the largest absolute uncertainty (0.5) represents the least precise measurement.

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

One atmosphere is numerically equal to approximately:

  1. ${ 10 }^{ 6 }\quad dyne\quad { cm }^{ -2 }$
  2. ${ 10 }^{ 2 }\quad dyne\quad { cm }^{ -2 }$
  3. ${ 10 }^{ 4 }\quad dyne\quad { cm }^{ -2 }$
  4. ${ 10 }^{ 8 }\quad dyne\quad { cm }^{ -2 }$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$P _{dyne/cm^2}=P _{atm}\times 1.01325\times 10^6$


$P _{atm}=1$


then $P _{dyne cm^2}=1.01325\times 10^6$


Option A is Correct.