Tag: applications of insulation

Questions Related to applications of insulation

A cold steel serving spoon is dipped in hot mushroom soup. It transfers heat to its other end by process of

physics temperature and heat applications of heat conduction applications of insulation clothes - our necessity

  1. Convection

  2. Conduction

  3. Radiation

  4. None

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Correct Option: B
Explanation:

Conduction: Process of transfer of heat by contacting one body with other. In this process, heat transfer takes place without moving the particles.

Metal floors cool more than a wood floor in winters because:
physics temperature and heat applications of heat conduction applications of insulation clothes - our necessity

  1. Metal conducts heat more readily than wood

  2. Wood conducts heat more readily than metal

  3. Metal has a higher specific heat than wood

  4. The temperature of the wood is higher than the temperature of the metal

  5. The temperature of the metal is higher than the temperature of the wood

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Correct Option: A
Explanation:

Metals are good conductor of heat whereas wood does not conduct heat at all.

Thus in winters, metal floors cool more than a wood floor.

Which of the following is a good conductor of heat?

physics temperature and heat applications of heat conduction applications of insulation clothes - our necessity

  1. Water and glass

  2. Plastic and copper

  3. Copper and glass

  4. Copper

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Correct Option: D

__and__are good conductors of heat

physics transfer of heat applications of heat conduction applications of insulation clothes - our necessity

  1. Silver, Copper

  2. Wood,Plastic

  3. Glass,Paper

  4. Pure water,Iron

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Correct Option: A
Explanation:
Silver and copper are good conductors of heat.
$\because$ Silver and copper are only metals present there and as we know metals have conductivity of heat and electricity than non-metal and metalloids. So, silver and copper are god conductors of heat.

State the correct statement

physics transfer of heat applications of heat conduction applications of insulation clothes - our necessity

  1. When we heat an object, it becomes hot

  2. When we heat an object, it expands in size

  3. When we heat an object, it changes its such such as water boils to form water vapour

  4. All of them are true

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Correct Option: D
Explanation:

When we heat an object, it changes its shape, nature and it becomes hot, the temperature increases due to movement of atoms.

Bad conductor of heat is

physics transfer of heat applications of heat conduction applications of insulation clothes - our necessity

  1. Copper

  2. Steel

  3. Silver

  4. None

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Correct Option: D
Explanation:

All of them, being metals, are good conductors.

The ............ the conductor, the more rapidly does heat transfer takes place.

physics transfer of heat applications of heat conduction applications of insulation clothes - our necessity

  1. better

  2. worse

  3. thinner

  4. thicker

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Correct Option: A
Explanation:

The better the conductor, the more rapidly does heat transfer takes place .


Better conductor means more thermal conductivity; more the thermal conductivity; more rapidly the heat transfer takes place.

The reason for providing copper bottoms in steel pans is :

physics transfer of heat applications of heat conduction applications of insulation clothes - our necessity

  1. aesthet, carly looks good

  2. that copper is better conductor than steel

  3. that copper is not a good conductor than steel

  4. None of the above 

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Correct Option: B
Explanation:

Copper bottoms are provided in steel pans because copper is better conductor of heat than steel.

Thermal conductivity of copper is highest ($38600w/mK$) while that of steel is lowest ($1245w/mK$).

Four rods of same material but with different radii and lengths are used to connect two reservoirs of heat with the same temperature difference. Which one will conduct more heat

physics transfer of heat applications of heat conduction applications of insulation clothes - our necessity

  1. r=1 cm, 1=1 cm

  2. r=1 cm, 1= 2 cm

  3. r= 1 cm, $1=\frac{1}{2}m$

  4. $r=\frac{1}{2}cm$, $1=\frac{1}{2}m$

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Correct Option: C

Which of the following arrangements is correct on the basis of conductivity of materials?

physics transfer of heat applications of heat conduction applications of insulation clothes - our necessity

  1. Silver > copper > aluminium > tungsten

  2. Silver > aluminium > copper > tungsten

  3. Copper > silver >tungsten> aluminium

  4. Silver > tungsten > copper > aluminium

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Correct Option: C