Heat Test

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Heat Test - 13

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Weekly Quiz Competition

Question 1
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Conduction is:

A
The process of transfer of heat which does not require any material medium

B
The process of transferring heat from molecule to molecule, without the actual movement of molecules

C
The process in which molecules conduct heat by moving from hotter regions to colder regions

D
The process in which heat energy moves through the medium of protons

Solution

$$\textbf{Correct option: Option (B).}$$

$$\textbf{Explanation:}$$

$$\bullet$$ Conduction is one of the modes of transfer of heat. It generally takes place in solids.

$$\bullet$$ Through this method heat is transferred from one part of the body to another through the vibratory motion of the molecule. No actual movement of molecules takes place in this method.

$$\textbf{Thus, conduction is the process of transfer of heat from molecule to molecule, without the}$$
$$\textbf{actual movement of molecules. Hence, option (B) is correct.}$$
Question 2
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Radiation depends on:

A
the temperature of the substance

B
the colour of the substance

C
both the above

D
none of these

Solution

Radiation depends upon temperature of the substance as well as colour of the substance. More the temperature, more the radiation of heat And as it is known that black body is good emitter as well as good absorber, radiation depends on colour.
Question 3
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In vacuum, heat is transferred by

A
conduction

B
convection

C
radiation

D
all the above three

Solution

In a vacuum, heat is transferred by radiation. In radiation, heat is transferred in the form of electromagnetic waves, which require no medium to propagate .
In conduction , heat is transferred from particle to particle , in vacuum there are no particles to transfer the heat , so conduction cannot transfer heat in vacuum .
In convection, heat is transferred by the actual movement of particles , but vacuum has no particles , so convection cannot work in vacuum .
Question 4
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Which of the following is a bad conductor of heat ?

A
Wood

B
Aluminium

C
Iron

D
Bronze

Solution

Wood is a bad conductor of heat.
Metals like aluminium, iron, bronze, etc. are generally good conductors of heat.
Question 5
1 / -0

The handles of cooking vessels are covered with plastic or wood because:

A
They are beautiful.

B
It is customary

C
They are good conductors of heat

D
They are bad conductors of heat

Solution

The handles of the utensils have to be touched by us and could cause a burn if it is too hot. Handles made of poor conductors of heat are safer.
Question 6
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A coin is dipped in molten wax kept in a glass tube. When we heat the upper part of the glass tube, the wax around the coin will not melt because:

A
Wax has a very high melting point

B
Wax is a good conductor of heat

C
Glass is a good conductor of heat

D
Wax and glass are bad conductors

Solution

Glass is a bad conductor of heat hence the heat from the upper part of the glass tube will not transfer easily to the lower part. Having said that, even wax is a bad conductor of heat and won't melt easily.
Question 7
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Substances which allow heat to pass through them are called:

A
Conductors

B
Insulators

C
Moderators

D
None of these

Solution

Conductors allow heat to pass through them through vibration of the molecules.
Question 8
1 / -0

Which of the following are good conductors of heat?

A
Metals

B
Glass

C
Water

D
Wood

Solution

Metals are generally good conductors of heat.
Non - metals are poor conductors of heat.
Question 9
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A polished, silvery surface is a:

A
Good absorber and good reflector of heat

B
Good absorber and bad radiator of heat

C
Poor absorber and good reflector of heat

D
Poor reflector and good radiator of heat

Solution

A polished surface acts as a mirror which reflects heat. It is a good reflector and poor absorber of heat.
Question 10
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Which of the following statement is true?

A
Metals are bad conductors of heat

B
In gases, heat is transferred by conduction

C
In conduction, molecules move from hotter to colder parts transmitting energy

D
Metals conduct heat better than the gases.

Solution

Metals conduct heat better than gases.
Order of conduction of heat
Solid $$\gt$$ Liquid $$\gt$$ Gas

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Re-Attempt Weekly Quiz Competition

Heat Test - 13

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Heat Test - 13

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SHARING IS CARING

Question 1

The process of transfer of heat which does not require any material medium

The process of transferring heat from molecule to molecule, without the actual movement of molecules

The process in which molecules conduct heat by moving from hotter regions to colder regions

The process in which heat energy moves through the medium of protons

Solution

Question 2

the temperature of the substance

the colour of the substance

both the above

none of these

Solution

Question 3

conduction

convection

radiation

all the above three

Solution

Question 4

Wood

Aluminium

Iron

Bronze

Solution

Question 5

They are beautiful.

It is customary

They are good conductors of heat

They are bad conductors of heat

Solution

Question 6

Wax has a very high melting point

Wax is a good conductor of heat

Glass is a good conductor of heat

Wax and glass are bad conductors

Solution

Question 7

Conductors

Insulators

Moderators

None of these

Solution

Question 8

Metals

Glass

Water

Wood

Solution

Question 9

Good absorber and good reflector of heat

Good absorber and bad radiator of heat

Poor absorber and good reflector of heat

Poor reflector and good radiator of heat

Solution

Question 10

Metals are bad conductors of heat

In gases, heat is transferred by conduction

In conduction, molecules move from hotter to colder parts transmitting energy

Metals conduct heat better than the gases.

Solution

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