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Heat Test - 23

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Weekly Quiz Competition

Question 1
1 / -0
In conductors, electrons can flow because their
A
ions are free

B
protons are free

C
electrons are free and mobile

D
negative ions are free

Solution

In conductors, electrons can flow because in conductors which are generally metals the electrons are free and mobile .Metals have free electrons present in outermost orbit i.e. they are loosely held by nucleus and free to move. This is the fact due to which the electrons can flow in conductors and conduct electricity.
Question 2
1 / -0

Which of the following materials is an electrical conductor?

A
Silver

B
Silver-coloured plastic

C
Cork

D
Rubber

Solution

As we know that generally, metals are conductors and non-metals are insulators. That is, metals conduct electricity much more than non-metal.
Silver is the only metal present in the list, so it is the only electrical conductor.
All others are non-metals.
Question 3
1 / -0

.................. surface absorbs more heat than any other surface under identical conditions.

A
White & Shiny

B
White & Rough

C
Black & Rough

D
Yellow & Shiny

Solution

Black & rough surface absorbs more heat than any other surface under identical conditions.
Black surface absorbs all the radiations more easily than any surface as its absorptivity is $$1$$.
Question 4
1 / -0

What is not an example of an insulator in the kitchen?

A
An oven mitt

B
A wooden spoon

C
Pots and pans

D
A plastic measuring cup

Solution

Pots and pans are not examples of insulators, they are conductors of heat, if it was not so, they could not be used for cooking food. And they are used for cooking, so they are conductors.
Question 5
1 / -0

When electrons in a material are free to move, the material is:

A
an insulator

B
a conductor

C
a semiconductor

D
none of these

Solution

When electrons in a material are free to move, the material is a conductor.
As only conductors have free electrons present in the outermost shell which are mobile and behave as charge carriers and are conduction electrons.
Question 6
1 / -0

The outermost electrons are __________ and are called conduction electrons :

A
not free to move in the atom

B
bound to the protons

C
static

D
able to go to nearby atoms

Solution

The outermost electrons are able to go to nearby atoms and are called conduction electrons.
Yes the outermost shell electrons are able to go to nearby atoms only during bond formation (ionic bond). They are free or mobile electrons because of that they conduct electricity so they are called conduction electrons.
Question 7
1 / -0

Which material is a best conductor?

A
silver

B
porcelain

C
rubber

D
gold

Solution

Out of silver, porcelain, rubber, and gold; porcelain and rubber are non-metals i.e. insulators. So
Now out of silver and gold conductivity of silver ($$62.1\times 10^6 siemens/m$$) is more than that of gold ($$44.2\times 10^6 siemens/m$$)
Question 8
1 / -0

The normal temperature of human body is ____________.

A
$$27^oC$$

B
$$37^oC$$

C
$$47^oC$$

D
$$57^oC$$

Solution

Normal body temperature varies by person, age, activity, and time of day. The average normal body temperature is generally accepted as $$98.6°F (37°C)$$.
Question 9
1 / -0

Heat will flow from

A
Hot body to cold body

B
Cold body to hot body

C
two bodies at the same temperature

D
None of these

Solution

Heat can be transferred from one place to another by three methods: conduction in solids, convection of fluids (liquids or gases), and radiation through anything that will allow radiation to pass. The method used to transfer heat is usually the one that is the most efficient. If there is a temperature difference in a system, heat will always move from higher to lower temperatures.Heat will flow from Hot body to cold body
Question 10
1 / -0

A clinical thermometer can not be used to measure

A
Room temperature

B
Human body temperature

C
Temperature of a boiling water

D
Temperature of a lake water

Solution

Clinical Thermometer (or doctor's thermometer) is used for measuring a person's temperature.
The temperature range that is marked on a clinical thermometer is about $$35^oC$$ to $$43^oC$$ (or $$ 95^oF$$ to $$109^oF). $$ whereas water boil at $$100^oC$$. That's why we can not measure temperature of boiling water using a Clinical Thermometer.

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Heat Test - 23

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Heat Test - 23

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SHARING IS CARING

Question 1

ions are free

protons are free

electrons are free and mobile

negative ions are free

Solution

Question 2

Silver

Silver-coloured plastic

Cork

Rubber

Solution

Question 3

White & Shiny

White & Rough

Black & Rough

Yellow & Shiny

Solution

Question 4

An oven mitt

A wooden spoon

Pots and pans

A plastic measuring cup

Solution

Question 5

an insulator

a conductor

a semiconductor

none of these

Solution

Question 6

not free to move in the atom

bound to the protons

static

able to go to nearby atoms

Solution

Question 7

silver

porcelain

rubber

gold

Solution

Question 8

$$27^oC$$

$$37^oC$$

$$47^oC$$

$$57^oC$$

Solution

Question 9

Hot body to cold body

Cold body to hot body

two bodies at the same temperature

None of these

Solution

Question 10

Room temperature

Human body temperature

Temperature of a boiling water

Temperature of a lake water

Solution

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