Tag: heat, internal energy and work

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Questions Related to heat, internal energy and work

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

Water in an earthen pitcher gets cooled due to

  1. slower rate of evaporation

  2. faster rate of evaporation

  3. no evaporation at all

  4. some unknown reason
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Earthen pots are used in summer. The pot has several pores through which water rinses out to the outer surface of the earthen pot and evaporates. In this process it takes away heat from the water inside the pitcher. As a result, the water inside gets cooled.

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

Salt is extracted from sea-water by

  1. Treating with chemicals depositing salt at the bottom

  2. Filtering the water by nets blocking the salt.

  3. Boiling the water by coil leaving behind the salt.

  4. Evaporating the water by sun leaving behind the salt.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Salt is produced by direct evaporation of sea-water in sun. This process is cheapest and most efficient.

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

From below what are used to prevent pesticides, fertilizers and salt from agricultural wastewater from contaminating the water bodies they flow into?

  1. Evaporation ponds

  2. Vaporising ponds

  3. Fermented ponds

  4. Wet ponds
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Evaporation ponds are used. Evaporation ponds are artificial ponds with very large surface area that are designed to efficiently evaporate water by sunlight and exposure to the ambient temperature.

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

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

  1. True

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

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

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

  1. Sublimation

  2. Fermentation

  3. Vaporisation

  4. Evaporation
Reveal answer Fill a bubble to check yourself
D Correct answer
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 .