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Thermos Flask and Heat Transfer

Understanding the design and working principles of thermos flasks including conduction, convection, radiation, and vacuum insulation

16 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

A thermos flask is designed to prevent the contents of the flask from losing heat. Which of the following statements concerning the design of thermos flasks is incorrect?

  1. The stopper helps reduce heat loss by convection
  2. The glass walls are silver coated to reduce emitted radiation
  3. The flask is designed to prevent heat loss by conduction, convection and radiation
  4. The vacuum between the glass walls prevents heat loss by preventing radiation
Question 2 Multiple Choice (Single Answer)

A                is a storage vessel that greatly lengthens the time over which its contents remain hotter or cooler than the flask's surroundings

  1. Closed flask
  2. Vacuum flask
  3. Conducting flask
  4. None of these
Question 3 Multiple Choice (Single Answer)

Vacuum in a vacuum flask prevents heat transfer through process of-

  1. Conduction only
  2. Conduction and Convection
  3. Convection only
  4. Radiation only
Question 4 Multiple Choice (Single Answer)

The silver coating on the inner bottle of a thermos flask

  1. prevents heat transfer by conduction
  2. prevents heat transfer by convection
  3. prevents heat transfer by radiation
  4. prevents heat transfer by absorption
Question 5 Multiple Choice (Single Answer)

The walls of thermo-flask are polished because

  1. shining bodies are good absorber of heat
  2. shining bodies are good radiator of heat
  3. shining bodies have emisivity as one
  4. none of the above
Question 6 Multiple Choice (Single Answer)

The vacuum between the walls of the flask prevents the transfer of heat by

  1. Conduction
  2. Convection
  3. Radiation
  4. All
Question 7 Multiple Choice (Single Answer)

Thermos flask was deviced by

  1. Fischer
  2. Joseph Lister
  3. Joseph Fourier
  4. Sir James Dewar
Question 8 Multiple Choice (Single Answer)

Thermos flask is a special kind of 

  1. Bottle
  2. Process
  3. Apparatus
  4. Weighing machine
Question 9 Multiple Choice (Single Answer)

A polished silver surface is

  1. good absorber of heat
  2. good reflector of heat
  3. poor reflector of heat
  4. none of these
Question 10 Multiple Choice (Single Answer)

A thermos flask maintains temperature of objects. It

  1. containing some kind of heating element to keep hot things hot.
  2. containing some kind of heating element to keep cold things cold.
  3. keeps hot things hot by not allowing heat to escape.
  4. All of the above
Question 11 Multiple Choice (Single Answer)

Thermos flask prevents loss or gain of heat by

  1. conduction only
  2. convections only
  3. radiation only
  4. all of the above
Question 12 Multiple Choice (Single Answer)

Thermos flask, when closed, is an approximate

  1. open system.
  2. closed system.
  3. isolated system.
  4. None of these
Question 13 Multiple Choice (Single Answer)

Liquid nitrogen is stored at $77K$ in a vacuum flask. The surrounding atmospheric temperature in the lab is $33K$.

  1. After a few days, the temperature of liquid nitrogen will increase.
  2. After a few days, the temperature of the lab will decrease.
  3. After a few days, the temperature of liquid nitrogen will decrease
  4. After a few days, the temperature of liquid nitrogen will remain unchanged.
Question 14 Multiple Choice (Single Answer)

Which of the following is an insulating component in thermos flask?

  1. plastic foam
  2. air
  3. vacuum
  4. All of the above
Question 15 Multiple Choice (Single Answer)

The purpose of using vacuum flask is to store

  1. hot drinks.
  2. cold drinks.
  3. hot as well as cold drinks.
  4. None of these
Question 16 Multiple Choice (Single Answer)

A themoflask prevent heat loss from-

  1. Conduction
  2. Convection
  3. radiation
  4. all of these
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