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Heat Test - 22

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Weekly Quiz Competition

Question 1
1 / -0

Easy to shape materials like ceramics are used as

A
conductors.

B
insulators.

C
electrodes.

D
catalysts.

Solution

Glass, tiles, pottery, porcelain, brick, cement etc. are ceramics.
They are obviously insulators of heat as they conduct heat.
Question 2
1 / -0

Examples of non-conductors include

A
sulphur.

B
phosphorus.

C
wood.

D
all of these.

Solution

Sulphur, Phosphorus, Wood are non-conductors of electricity due to no presence of free electrons in outermost shell.
Question 3
1 / -0

Why are electrical plugs made of plastic?

A
Plastic is stronger than all other materials.

B
Plastic is a good electrical conductor.

C
Plastic protects people from electricity.

D
Only plastic can be made into the right shape for a plug

Solution

Electrical plugs are made up of plastic because plastic protects people from electricity. As we know that plastic is an electrical insulator readily available and cheap. So as to make the plugs shock free, they are made up of plastic.
Question 4
1 / -0

Why are insulators important in an electrical circuit?

A
They make the circuit safe to touch.

B
Electricity will only flow through insulators.

C
Light bulbs and buzzers are only made of insulating materials.

D
All of the .above

Solution

Insulators are used in circuits, as they don't conduct electricity, they are used for insulation of wire, switches, plugs, etc. So that circuit could be made shock free and safe to touch.
Question 5
1 / -0

Why is electrical wiring usually covered with a layer of plastic?

A
To make it look pretty

B
To help electricity flow along the wire

C
To make it safe

D
none of these

Solution

Electrical wiring is usually covered with layer of plastic to make it safe. As we know that plastic is an electrical insulator and it is readily available and cheap. So as to insulate the electricity carrying wire, to make it shock free. It is covered with layer of plastic.
Question 6
1 / -0

Which of these could be used to complete an electrical circuit?

A
A piece of gravel.

B
A rubber.

C
A crayon

D
Scissors made of iron

Solution

Scissors made of iron could be used to complete an electrical circuit. As iron is metal and conductor so can conduct electricity easily. And others are non-metals. So they could not conduct electricity and can't complete the circuit.
Question 7
1 / -0

Which of these is a good electrical conductor?

A
Water

B
Sweat

C
The human body

D
All of the above

Solution

Water is a good electrical conductor but not distilled water. Tap water, Sea water, rain water etc. conduct electricity as they consist of impurities; salts of $$Ca, \; Mg,\; Na$$ which behave as charge carriers.

Sweat conducts electricity although it is mainly water, it still consists of lot of minerals, lactic acid, urea; in short, it is an ionic liquid (electrolyte)

Human body consists of $$75 $$% of water and also consists of many minerals and salts. So human body also conducts electricity.
Question 8
1 / -0

A material that does NOT let electricity pass through it is called ...

A
an electrical conductor

B
an electrical insulator

C
an electrical appliance

D
none of these

Solution

A material that does not allow to electricity to pass through, it is called an electrical insulator.
They do not have free electrons present in their outer most shell which would work as charge carriers for conduction of electricity.
Question 9
1 / -0

Which of the following would normally be the best conductor?

A
Copper

B
Glass

C
Steel

D
Silver

Solution

Among copper, glass, silver and steel, glass is non-metal i.e. insulator; so it has least conductivity.
Conductivity order:
Silver $$\gt$$ Copper $$\gt$$ Steel
(in $$siemens/m$$) at $$20^oC$$
$$62.1\times 10^6 \gt 59.8\times 10^6 \gt 6.21\times 10^6$$
Question 10
1 / -0

Poor conductors of electricity consists of

A
silver

B
aluminum

C
distilled water

D
copper

Solution

Pure water or distilled water does not conduct electricity but tap water, rainwater, or seawater conduct electricity. For electricity to travel through a liquid, movement of charges must take place through the liquid. In tap water, rainwater or seawater, there are impurities such as a salt of $$Na,Mg \; and \; Ca$$. They behave as charge carriers for the conduction of electricity. But in distilled water, there are no impurities i.e. no ions. There are only neutral water molecules. So, distilled water does not conduct electricity.

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Re-Attempt Weekly Quiz Competition

Heat Test - 22

Result

Heat Test - 22

Score

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SHARING IS CARING

Question 1

conductors.

insulators.

electrodes.

catalysts.

Solution

Question 2

sulphur.

phosphorus.

wood.

all of these.

Solution

Question 3

Plastic is stronger than all other materials.

Plastic is a good electrical conductor.

Plastic protects people from electricity.

Only plastic can be made into the right shape for a plug

Solution

Question 4

They make the circuit safe to touch.

Electricity will only flow through insulators.

Light bulbs and buzzers are only made of insulating materials.

All of the .above

Solution

Question 5

To make it look pretty

To help electricity flow along the wire

To make it safe

none of these

Solution

Question 6

A piece of gravel.

A rubber.

A crayon

Scissors made of iron

Solution

Question 7

Water

Sweat

The human body

All of the above

Solution

Question 8

an electrical conductor

an electrical insulator

an electrical appliance

none of these

Solution

Question 9

Copper

Glass

Steel

Silver

Solution

Question 10

silver

aluminum

distilled water

copper

Solution

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