Heat Test

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Heat Test - 19

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Weekly Quiz Competition

Question 1
1 / -0

By the process of convection, the transfer of heat is always

A
Vertically downwards

B
Vertically upwards

C
Both

D
None

Solution

By the process of convection, heat is always transferred vertically upwards. This happens because the medium particles near the source of heat absorb heat from the source, their volume expands, their density becomes lighter and they start moving upwards.
Question 2
1 / -0

_________ is a process of transfer of heat by the actual movement of the medium particles.

A
Conduction

B
Convection

C
Radiation

D
All

Solution

Convection is a process of transfer of heat by the actual movement of the medium particles. A medium is required for the transfer of heat by convection.
Question 3
1 / -0

In vacuum, heat ______ be transferred by convection.

A
Can

B
Cannot

C
Both

D
None

Solution

In liquids and gases, the heat is transferred by convection. No medium is required for the transfer of heat by radiation. In a vacuum, heat cannot be transferred by convection.
Question 4
1 / -0

Which of the following behaves as insulator?

A
Ebonite

B
Mercury

C
Silver

D
Copper

Solution

Ebonite is a very good insulator as it is a non-metal while mercury, silver and copper are examples of conductors because these three are metals.
Question 5
1 / -0

Air is a _______ conductor of heat.

A
Good

B
Bad

C
Both

D
None

Solution

All gases are poor conductor of heat. So air being a mixture of gases is also a poor conductor of heat.
Question 6
1 / -0

Define good conductors of heat.

A
Substances that can easily melt are called good conductors of heat.

B
Substances through which heat can pass easily are called good conductors of heat.

C
Substances through which heat cannot pass easily are called good conductors of heat.

D
Substances that cannot easily melt are called good conductors of heat.

Solution

Good conductors of heat are substances through which heat can pass easily.
Question 7
1 / -0

If needle is burnt then the heat transfer through the whole length of needle is faster because:

A
needle is a bad conductor of heat

B
needle is a good conductor of heat

C
needle is an insulator

D
none of the above

Solution

If needle is burnt then the heat transfer through the whole length of needle is faster, because needle is made up of metal, which is a good conductor of heat. In the needle, heat passes along the whole length by conduction, in which heat is transferred by one atom to nearby atoms .
Question 8
1 / -0

Conductors become hot easily because they have:

A
high specific capacity

B
low specific heat capacity

C
high freezing point

D
low freezing point

Solution

In conduction, heat is transferred by the vibrations of molecules. The density of conductors is large, it means molecules are close to each other. Because of that they can easily transfer the heat quickly throughout the whole volume of the conductor. Thus, less heat is needed to raise the temperature of unit mass of the conductors by $$1^oC$$. This heat is called specific heat capacity. Therefore conductors become hot easily on account of low specific heat capacity.
Question 9
1 / -0

Irons have much lower specific heat than:

A
Steel

B
Copper

C
Water

D
none of the above

Solution

Specific heat of iron - $$460.548\ J/kg-K$$
Specific heat of steel - $$502.416\ J/kg-K$$
Specific heat of copper - $$376.812\ J/kg-K$$
Specific heat of water - $$4184\ J/kg-K$$

So from a simple comparison, we can see that irons have much lower specific heat than water.
Question 10
1 / -0

Find the good conductors of heat from the given options.

A
Metals

B
Plastic

C
Paper

D
Wood

Solution

Metals are generally good conductors of heat.
Plastic, paper, and wood - all are bad conductors of heat.

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Heat Test - 19

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Heat Test - 19

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Question 1

Vertically downwards

Vertically upwards

Both

None

Solution

Question 2

Conduction

Convection

Radiation

All

Solution

Question 3

Can

Cannot

Both

None

Solution

Question 4

Ebonite

Mercury

Silver

Copper

Solution

Question 5

Good

Bad

Both

None

Solution

Question 6

Substances that can easily melt are called good conductors of heat.

Substances through which heat can pass easily are called good conductors of heat.

Substances through which heat cannot pass easily are called good conductors of heat.

Substances that cannot easily melt are called good conductors of heat.

Solution

Question 7

needle is a bad conductor of heat

needle is a good conductor of heat

needle is an insulator

none of the above

Solution

Question 8

high specific capacity

low specific heat capacity

high freezing point

low freezing point

Solution

Question 9

Steel

Copper

Water

none of the above

Solution

Question 10

Metals

Plastic

Paper

Wood

Solution

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