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 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.

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

Our body temperature is maintained at :

  1. ${20 ^ 0C }$
  2. ${41 ^0 C}$
  3. ${37 ^0 C}$
  4. ${11^0 C}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Our body temperature is maintained at $37^\circ C$ or $98^\circ F$ on an average. Our body has thermo-regulation mechanism that keeps the body at optimum operating temperature. Water plays an important role in this mechanism.

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 SI unit for force is:

  1. Torr

  2. Newton

  3. Joule

  4. Dyne
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Force is the product of mass and acceleration

 $\therefore$ Force $=$ Mass $\times$ acceleration
The S.I unit of force is $kg.m/s^2$ or Newton
 $1$ Newton $= 10^5$ Dyne

Option $B$ is the correct answer.