Tag: change of states

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Questions Related to change of states

Multiple choice physics the kinetic model of matter force and kinetic theory change of states phase change

When $1\;g$ of water at $100^{\circ}C$ gets converted into steam at the same temperature, the change in volume is approximately :

  1. $1\;cc$

  2. $1000\;cc$

  3. $1500\;cc$

  4. $1670\;cc$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Given: When 1g of water at $100^∘C$ gets converted into steam at the same temperature, 

To find the change in volume
Solution:
We know, 
Density of water, $\rho=1000kg/m^3=1 g/cm^3$
Density of steam, $\rho=0.6kg/m^3=0.0006 g/cm^3$
Mass of the water and mass of water, $m=1g$
Volume of water is
$m=\rho V\\implies V=\dfrac m\rho=\dfrac 11\\implies V=1cc$
Volume of steam, 
$V'=\dfrac m\rho=\dfrac 1{0.0006}=1666.7cc\approx1667cc$
The change in volume, 
$\Delta V=V'-V\\implies \Delta V=1667-1=1666cc$

Multiple choice physics the kinetic model of matter force and kinetic theory change of states phase change

 Identify what happens to the temperature of water as it boils?

  1. It remains constant

  2. It continues to increase as long as heat is applied

  3. It increases only if the amount of heat applied is increased

  4. temperature and heat are not realted

  5. temperature and heat are related but not the same
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Temperature of a substance during its phase change remains constant. Hence when water boils, the temperature of water remains constant  i.e  $100^oC$.

Multiple choice physics the kinetic model of matter force and kinetic theory change of states phase change

boiling point of petrol

  1. ${ 10 }^{ o }-{ 25 }^{ o }$

  2. $ { 120 }^{ o }-{ 180 }^{ o }C$

  3. $ { 30 }^{ o }-{ 120 }^{ o\quad }C$

  4. ${ 100 }^{ o }-{ 270 }^{ 0 }C$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Petrol (gasoline) is a mixture of hydrocarbons with boiling points typically ranging from 30 to 200 degrees Celsius. Option C provides the most accurate range among the choices.

Multiple choice physics the kinetic model of matter force and kinetic theory change of states phase change

State whether true or false:

Dew point is the temperature at which the gas at given atmospheric conditions becomes saturated.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The dew point is the temperature at which the water vapor in a sample of air at constant barometric pressure condenses into liquid water at the same rate at which it evaporates so dew point is a temperature at which the air becomes saturated.

Multiple choice physics the kinetic model of matter force and kinetic theory change of states phase change

A fan produces a feeling of comfort because :

  1. A fan supplies cool air

  2. Of the evaporation of sweat

  3. Fan increases the humidity in air

  4. Fan decreases the humidity in air
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A fan produces a feeling of comfort because of evaporation of sweat. As evaporation releases heat energy, and evaporation of sweat. Results in feeling cool in those body parts.

Multiple choice physics the kinetic model of matter force and kinetic theory change of states phase change

Define intermolecular force of attraction.

  1. The force of attraction between the electrons and protons of an atom is called the intermolecular force of attraction.

  2. The force of attraction between the molecules of matter is called the intermolecular force of attraction.

  3. The force of attraction between the elements in a molecule is called the intermolecular force of attraction.

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The force of attraction between the molecules of matter is called the intermolecular force of attraction.

Multiple choice physics the kinetic model of matter force and kinetic theory change of states phase change

At what temperature rms speed of air molecules is doubled of that at NTP?

  1. $819^oC$

  2. $719^oC$

  3. $909^oC$

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$v _{rms}\propto \sqrt{T}$
$\Rightarrow \displaystyle\frac{v^2 _1}{v^2 _2}=\frac{T _1}{T _2}$
$\Rightarrow \displaystyle\frac{v^2}{4v^2}=\frac{273}{T _2}$
$\Rightarrow \displaystyle T _2=1092K$
$=819^oC$

Multiple choice physics the kinetic model of matter force and kinetic theory change of states phase change

He was a pioneer in the kinetic theory of gases. He contributed a lot to the fluid mechanics and the theory of vibrating strings. Who is this founder of mathematical physics?

  1. Sir Isaac Newton

  2. Daniel Bernouili

  3. James Clerk Maxwell

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

Daniel Bernoulli is well known for his work in fluid mechanics (Bernoulli's principle) and the kinetic theory of gases, as well as his mathematical analysis of vibrating strings.