Electricity and Circuits Test

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Electricity and Circuits Test - 2

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Question 1
1 / -0

Study the following table and figure out the wrongly categorised material.

Non-conductors of Electricity Conductors of Electricity

Cotton Steel

Plastic Silver

Copper Iron

Rubber Brass

Wool Gold

A
Wool

B
Copper

C
Iron

D
Silver

Solution

Copper is a good conductor of electricity and it is not an insulator.
Question 2
1 / -0

Which of the following statements is NOT true?

A
Human body is a conductor of electricity.

B
Metal is a conductor.

C
The air gap surrounding an electric circuit acts as an insulator.

D
A salt solution is an insulator.

Solution

In liquids, the current flows due to the presence of ions; and when we dissolve salt in water, it dissociates into ions and the salt solution starts conducting.
Question 3
1 / -0

Seema was making a circuit using a wire, switch and a bulb, but she was running short of the connecting wires. To complete the circuit, she may use a

A
glass bangle

B
thick thread

C
rubber pipe

D
steel spoon

Solution

To complete the circuit, she may use a steel spoon because steel is a good conductor of electricity.
Question 4
1 / -0

Pick the correct statement.

A
Electric current can flow through metals.

B
Instead of metal wires, a jute string can be used to complete a circuit.

C
Electric current can pass through a sheet of thermocol.

D
When current flows through a circuit, it is called an open circuit.

Solution

Metals are good conductors of electricity, so current flows through them easily. Whereas, a jute string and the thermocol are insulators.
Current flows through the circuit only when the circuit is closed.
Question 5
1 / -0

What should be present in a substance for it to be a conductor of electricity ?

A
Strongly-held electrons

B
Strongly-held protons

C
Free electrons

D
Free protons

Solution

Electric current in the flow of the charge, so for the electric current to flow, free electrons should be present in the conductors.
Question 6
1 / -0

The filament of a torch bulb is fixed to two thicker wires. One thick wire is connected to the ________ and the other thick wire is connected to the ___________.

A
metal case at the base of the bulb; metal tip at the centre of the base

B
metal case at the upper side of the bulb; metal tip at the centre of the base

C
metal tip at the upper side of the bulb; metal case at the centre of the base

D
metal case at the base of the bulb; metal tip at the base of the bulb

Solution

One thick wire is connected to the metal case at the base of the bulb and the other thick wire is connected to the metal tip at the centre of the base.

Question 7

1 / -0

Match the columns:

Column I	Column II
A. Covering of switches, appliances, plugs and sockets is made of insulators	P. is a simple device that either breaks the circuit or completes it.
B. When the terminals of the bulb are connected with those of the electric cell by wires, then	Q. because they don't allow current to pass through them, so we don't get a shock if we touch them.
C. Electric switch	R. the current passes through the filament of the bulb. This makes the bulb glow.
D. Electric cell	S. is a device which converts chemical energy into electrical energy.

A - Q, B - R, C - P, D - S

A - P, B - Q, C - R, D - S

A - S, B - P, C - R, D - Q

A - P, B - S, C - R, D - Q

Solution

Covering of switches, appliances, plugs and sockets is made of insulators because they don't allow current to pass through them, so we don't get a shock if we touch them.
When the terminals of the bulb are connected with those of the electric cell by wires, the current passes through the filament of the bulb. This makes the bulb glow.
Electric switch is a simple device that either breaks the circuit or completes it.
Electric cell is a device which converts chemical energy into electrical energy.

Question 8
1 / -0

Which of the following is/are the correct reason(s) for using tungsten in an incandescent bulb ?

A
It is lustrous and shining.

B
It has a very high melting point.

C
It has a low melting point.

D
It is a bad conductor of heat.

Solution

Yes, because of a very high melting point, tungsten is used as a filament in an incandescent bulb.

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Non-conductors of Electricity	Conductors of Electricity
Cotton	Steel
Plastic	Silver
Copper	Iron
Rubber	Brass
Wool	Gold

Electricity and Circuits Test - 2

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Electricity and Circuits Test - 2

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Question 1

Wool

Copper

Iron

Silver

Solution

Question 2

Human body is a conductor of electricity.

Metal is a conductor.

The air gap surrounding an electric circuit acts as an insulator.

A salt solution is an insulator.

Solution

Question 3

glass bangle

thick thread

rubber pipe

steel spoon

Solution

Question 4

Electric current can flow through metals.

Instead of metal wires, a jute string can be used to complete a circuit.

Electric current can pass through a sheet of thermocol.

When current flows through a circuit, it is called an open circuit.

Solution

Question 5

Strongly-held electrons

Strongly-held protons

Free electrons

Free protons

Solution

Question 6

metal case at the base of the bulb; metal tip at the centre of the base

metal case at the upper side of the bulb; metal tip at the centre of the base

metal tip at the upper side of the bulb; metal case at the centre of the base

metal case at the base of the bulb; metal tip at the base of the bulb

Solution

Question 7

A - Q, B - R, C - P, D - S

A - P, B - Q, C - R, D - S

A - S, B - P, C - R, D - Q

A - P, B - S, C - R, D - Q

Solution

Question 8

It is lustrous and shining.

It has a very high melting point.

It has a low melting point.

It is a bad conductor of heat.

Solution

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