Tag: the kinetic model of matter

Questions Related to the kinetic model of matter

When we apply paint in our house, it dries out after some while. This happens due to what?

physics the kinetic model of matter evaporation heat, internal energy and work phase change

  1. Cooling

  2. Evaporation

  3. Fermentation

  4. None of these

Show answer
Correct Option: B
Explanation:

The wet paint is dried out because liquid portion in paint is evaporated . Although evaporisation is also a type of vaporisation .


Splashes dry up at the edges of puddle due to what?

physics the kinetic model of matter evaporation heat, internal energy and work phase change

  1. Vaporisation

  2. Evaporation

  3. Sublimation

  4. Fermentation

Show answer
Correct Option: B
Explanation:

Splashes dry up at the edges of puddle , because of evaporisation as high energy molecules of water escape from water .

State True or False :
Evaporation or perspiration cools our body.

physics the kinetic model of matter evaporation heat, internal energy and work phase change

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Evaporation or perspiration cools our body, it is true . Because molecules of sweat in perspiration , having higher kinetic energy and it goes out in the form of sweat, hence the average kinetic energy (internal energy) of molecules in sweat decreases, therefore, its temperature gets down and we feel cooler .

When we dry our wet clothes in sun in a line then which phenomena applies to make them dry?

physics the kinetic model of matter evaporation heat, internal energy and work phase change

  1. Sublimation

  2. Fermentation

  3. Vaporisation

  4. Evaporation

Show answer
Correct Option: D
Explanation:

Clothes are dried by evaporation due to heat from sunlight . In a line , clothes get sunlight for whole day , and due to heat from sun, rate of evaporation increases and clothes dry quickly .

In our daily chores when we mop our house floor then it becomes dry after some time. Which phenomena applies here?

physics the kinetic model of matter evaporation heat, internal energy and work phase change

  1. Fermentation

  2. Sublimation

  3. Vaporisation

  4. Evaporation

Show answer
Correct Option: D
Explanation:

Our floor get wet due to mopping , and after some time water droplets are evaporated and floor become dry .



Which is the final step of a water cycling driving small turbines before it is fed back into the primary pool?

physics the kinetic model of matter evaporation heat, internal energy and work phase change

  1. Evaporation

  2. Fermentation

  3. Sublimation

  4. Vaporisation

Show answer
Correct Option: A
Explanation:

Evaporation is the final step of a water cycling driving small turbines before it is fed back into the primary pool. Water vapours are moving in the pipe at high speed under pressure exposed to turbine; which makes turbine rotate; left water vapour again condenses and go back in liquid state.


State True or False :

A puddle on the road dries out after some while in sun due to fermentation.

physics the kinetic model of matter evaporation heat, internal energy and work phase change

  1. True

  2. False

Show answer
Correct Option: B
Explanation:

A puddle on the road dries out after some time due to evaporation, not due to fermentation . 

Fermentation is a chemical breakdown of a substance by microorganism (bacteria , yeast etc.) .

State True or False :
Evaporation phenomena is used when we dry our hair with hair dryer. 

physics the kinetic model of matter evaporation heat, internal energy and work phase change

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

When we dry our hair , evaporisation takes place , as water droplets in hair are evaporated by air . The given statement is true .

What is not true about evaporation?

physics the kinetic model of matter evaporation heat, internal energy and work phase change

  1. Greater the surface area of the liquid, the quicker is the evaporation

  2. Evaporation produces cooling

  3. Evaporation takes place at all the temperatures

  4. Evaporation is nothing but boiling at the highest temperature of the liquid

Show answer
Correct Option: D
Explanation:

Evaporization is the vaporization process of converting the liquid phase to vapour phase when surrounding temperature is more than liquid / water temperature.

It should not be confused with boiling as boiling means whole phase change from liquid to vapour at highest temperature.

Statement-1
Evaporation takes place from the surface of a liquid.
Statement-2
The molecules at the surface have less attractive energy than those inside the liquid.

physics the kinetic model of matter evaporation heat, internal energy and work phase change

  1. Statement-1 is true, Statement-2 is true and Statement-2 is the correct explanation for Statement- 1

  2. Statement-1 is true, Statement-2 is true but Statement-2 is not the correct explanation for Staement-1

  3. Statement-1 is true, Statement-2 is false.

  4. Statement-1 is false, Statement-2 is true.

Show answer
Correct Option: A
Explanation:

Evaporation is a surface phenomenon.
Particles present on the surface of a liquid only face attraction from one side (the side containing fluid particles) and surface tension. Where as particles inside the liquid would face attractive forces from all around, making it difficult for such particles to evaporate or escape.
Hence the statement is true, explanation is true and the explanation is the correct explanation for the statement.