Heat Test

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Heat Test - 21

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Weekly Quiz Competition

Question 1
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When you approach fire, you feel heat on your body. Which of the following mode of heat transfer is involved in this ?

A
Conduction

B
Convection

C
Radiation

D
Thermal expansion

E
Specific heat

Solution

Heat radiation is the transfer of energy, in the form of electromagnetic waves, through space. The heat emitted from fire, is transmitted through space in the form of radiation. Hence, when you approach fire, you feel heat on your body.
.
This is the reason that, when facing the fire, only the front is warmed. The backside is not warmed until the person turns around.

The more you go closer to the fire, more the amount of radiation is received.
Question 2
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Which of the following is an example of convection?

A
The heat of the sun warming our planet

B
The heat from an electric stove warming a frying pan

C
Ice cubes cooling a drink

D
A microwave oven cooking a meal

E
An overhead fan cooling a room

Solution

Convection is a form of heat transfer where a large number of molecules move from one place to another. An overhead fan works precisely by this method: it sends cooler air molecules down into a hot room, cooling the temperature of the room. The heat of the sun and the cooking action of a microwave are both forms of radiation, while the heat on a frying pan and the cooling action of ice cubes are both forms of conduction.
Question 3
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Directions For Questions

In above shown figure, a candle is burning inside the metal box. The heat transfer between box and its surrounding can be by three types of heat transfer.
I. radiation
II. conduction
III. convection

...view full instructions

If you touch the outside surface of the metal container, your hand will become warmer directly by which of the above choices?

A
I only

B
I and II only

C
I and III only

D
II only

E
III only

Solution

When you touch the outer surface of the container, there is a direct contact between the hand and the container. So, heat is conducted through the metal to your hand and causing the sensation of hotness.
Question 4
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As the air around the base of a candle flame is heated, it rises and is replaced by cooler air due to which of following type of heat transfer?

A
Conduction

B
Convection

C
Radiation

D
Diffraction

E
Latent heat

Solution

Whenever the temperature of any region of a liquid or gas becomes greater than other region ,density of hotter region becomes low for that the particles from high density region (colder region) come there ,that is convection. in the given incident it is happening so it is convection.
In conduction particles don't leave their positions so it not conduction .
In radiation heat is transferred from one point to other without heating the medium so it is also not radiation.
Latent heat is related to state change but there is no state change.
Diffraction is the property of waves , having no relation in this particle system.
Question 5
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In conductors, outer electrons :

A
are not tightly bound to the nucleus

B
are tightly bound to the nucleus

C
never becomes free electrons

D
are always free to move

Solution

Conductors can easily conduct electricity because outer electrons are loosely bound to the nucleus.
Question 6
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Overhead cables are insulated from pylons through

A
plastic.

B
ceramics and glass.

C
rubber.

D
PVC.

Solution

Examples of ceramics are clay, bricks, tiles, glass, and cement.
Overhead cable is insulated from pylons through ceramics and glass.
The overhead power lines that are supported by pylons are not covered in insulating materials. However, ceramics or glass insulators are fitted between pylons and wires. This stops electricity flowing down the metal pylons to the ground, where it could hurt or even kill people or animals.
Question 7
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Which of the following is a good conductor of heat?

A
Steel

B
Glass

C
Wood

D
Rubber

Solution

Steel being an alloy of metals, it has free electrons in its atoms. They start moving along with the heat flow and help in the conduction of heat. All metals are good conductors. The other three being non-metals, do not have free electrons. Hence they are bad conductors
Question 8
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Using a heating blanket to get warm is an example of-

A
Conduction

B
Convection

C
Radiation

D
Insulation
Question 9
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The heat transfer in air is poor because

A
it takes place mainly due to convection

B
it takes place mainly due to conduction

C
it takes place mainly due to radiation

D
all of the above

Solution

Air is a gas and its molecules are far apart from each other. So, this is not a good condition for conduction. Also, air being a non-metal doesn't have free electrons for conduction. Hence option B is not applicable.
C is also not applicable because radiation doesn't need any medium. Air being a fluid, convection can take place through it. But convection is not a very fast mode of transfer of heat.
Question 10
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Air is a bad conductor of heat because:

A
it's molecules are in continuous contact with each other.

B
it's molecules are not in continuous contact with each other

C
it's molecules absorb all the heat

D
it's molecules are moving randomly due to Brownian motion

Solution

Air is a bad conductor of heat because it's molecules are not in continuous contact with each other.
Air molecules are too far to disperse heat energy to one another efficiently. Heat is conducted by molecules and atoms that are very closely bonded together and vibrating at high frequency.

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Heat Test - 21

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Heat Test - 21

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SHARING IS CARING

Question 1

Conduction

Convection

Radiation

Thermal expansion

Specific heat

Solution

Question 2

The heat of the sun warming our planet

The heat from an electric stove warming a frying pan

Ice cubes cooling a drink

A microwave oven cooking a meal

An overhead fan cooling a room

Solution

Question 3

I only

I and II only

I and III only

II only

III only

Solution

Question 4

Conduction

Convection

Radiation

Diffraction

Latent heat

Solution

Question 5

are not tightly bound to the nucleus

are tightly bound to the nucleus

never becomes free electrons

are always free to move

Solution

Question 6

plastic.

ceramics and glass.

rubber.

PVC.

Solution

Question 7

Steel

Glass

Wood

Rubber

Solution

Question 8

Conduction

Convection

Radiation

Insulation

Question 9

it takes place mainly due to convection

it takes place mainly due to conduction

it takes place mainly due to radiation

all of the above

Solution

Question 10

it's molecules are in continuous contact with each other.

it's molecules are not in continuous contact with each other

it's molecules absorb all the heat

it's molecules are moving randomly due to Brownian motion

Solution

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