Tag: matter around us

Questions Related to matter around us

One atmosphere is numerically equal to approximately:

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

  1. ${ 10 }^{ 6 }\quad dyne\quad { cm }^{ -2 }$

  2. ${ 10 }^{ 2 }\quad dyne\quad { cm }^{ -2 }$

  3. ${ 10 }^{ 4 }\quad dyne\quad { cm }^{ -2 }$

  4. ${ 10 }^{ 8 }\quad dyne\quad { cm }^{ -2 }$

Show answer
Correct Option: A
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.

The S.I. unit of pressure 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. pascal

  2. atm

  3. newton

  4. None of the above

Show answer
Correct Option: A
Explanation:

The SI unit of pressure is pascal. Newton is the unit of force and atm is not the S.I. unit of pressure.

The S.I unit of mass 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. kilogram

  2. gram

  3. decigram

  4. milligram

Show answer
Correct Option: A
Explanation:

The S.I unit of mass is kilogram (kg).


Hence the correct option is A.

Our body temperature is maintained at :

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

  1. ${20 ^ 0C }$

  2. ${41 ^0 C}$

  3. ${37 ^0 C}$

  4. ${11^0 C}$

Show answer
Correct Option: C
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.

The SI unit for force 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. Torr

  2. Newton

  3. Joule

  4. Dyne

Show answer
Correct Option: B
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.

What is the S.I unit of volume?

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

  1. cubic centimeter

  2. cubic meter

  3. cubic foot

  4. cubic millimeter

Show answer
Correct Option: B
Explanation:

The S.I unit of volume is cubic meter $(m^3)$.


Hence the correct option is B.

The S.I. unit of temperature 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. kelvin

  2. celsius

  3. fahrenheit

  4. None of the above

Show answer
Correct Option: A
Explanation:

The SI unit of temperature is kelvin.

What is the physical state of water at $30^{\circ} C$?

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

  1. Solid

  2. Liquid

  3. Gas

  4. None of the above

Show answer
Correct Option: B
Explanation:

Water at $30^{\circ}C$ is liquid and it remains in liquid state from $0^{\circ}C$ to $100^{\circ}C$.

Convert $-273^oC$ to Kelvin scale.

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 K

  2. 273 K

  3. 300 K

  4. 5 K

Show answer
Correct Option: A
Explanation:

To convert from the Celsius scale to the Kelvin scale, we add $273$ to the Celsius scale. So, $-273+273=0\ K$


Hence, the correct option is $A$

The S.I. unit of length 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. metre

  2. kilometre

  3. foot

  4. yard

Show answer
Correct Option: A
Explanation:

The S.I. unit of length is metre.