Tag: transfer of heat

Quizzes (8) Questions (172)

Questions Related to transfer of heat

Multiple choice physics heat energy transfers heat and heat transfer heat energy transfer transfer of heat

A cotton sheet is ironed with hot electricity. How is energy transferred through the metal base of the iron to the sheet?

  1. by conduction only

  2. by convection only

  3. by radiation only

  4. by convection and radiation only
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Conduction occurs when two objects at different temperatures are in contact with each other. Heat flows from the warmer to the cooler object until they are both at the same temperature.
The iron and cotton sheet is in contact with each other so, there is conduction between them.

Energy transformation while ironing clothes takes out their wrinkles and makes them smooth. This takes the heat, which is one type of energy. In the iron, electrical energy is used, and it is transformed into heat energy.

Multiple choice physics heat energy transfers heat and heat transfer heat energy transfer transfer of heat

Two layers of cloth of equal thickness provide warmer covering than a single layer of cloth of double the thickness, because they :

  1. behave like a thermos

  2. have lesser thickness

  3. allow heat from atmosphere to the body

  4. enclose between them a layer of air
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Air is a bad conductor of heat, hence if layer of air is isolated between two layers of cloth, warmer covering will be provided than if only one layer of cloth, where only body is isolated from surrounding air by cloth. 

Multiple choice physics heat energy transfers heat and heat transfer heat energy transfer transfer of heat

Mercury is generally used in thermometer because it has a

  1. High fluidity

  2. High density

  3. High coefficient of expansion

  4. High specific heat
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Most metals are good conductors of heat and they are solids at room temperature. Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer.

Multiple choice physics heat energy transfers heat and heat transfer heat energy transfer transfer of heat

State whether given statement is True or False
To prevent heat conduction to our hands, handle of cooking vessels are made of bad conductors.

  1. True

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

Good conductor will transfer the heat from vessel's handle to our hands and let our hands burn. So, bad conductor of heat, materials is used for manufacturing of vessel's handle.

Multiple choice physics heat energy transfers heat and heat transfer heat energy transfer transfer of heat

What type of conductor should we used to make water pipes in cold countries?

  1. Good conductor

  2. Poor conductor or bad conductor

  3. Material does not help in such cases

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

Poor conductor should be used, so that they will not allow heat to pass from water inside the pipe to outside atmosphere to prevent water from freezing. It will help pipes from busting.

Multiple choice physics heat energy transfers heat and heat transfer heat energy transfer transfer of heat

On a cold day when a room temperature is $15^oC$, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of $15^oC$, because

  1. metals have higher thermal capacity than plastics

  2. plastics have a lower density than metals

  3. metals are good conductor of heat

  4. plastics have a higher thermal conductivity than metals
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

On a cold day when a room temperature is $15^oC$, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of $15^oC$ because metals are good conductor of heat, so they could absorb and release heat in a better way than insulators.