Electricity and Circuits Test

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Electricity and Circuits Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is false about an electric cell?

A
It converts chemical energy into electrical energy.

B
It has a neutral terminal.

C
It has a positive terminal.

D
It has a negative terminal.

Solution

A cell converts chemical energy into electrical energy and has positive and negative terminals.
Question 2
1 / -0

In a simple voltaic cell, the negative electrode is made of

A
zinc

B
copper

C
carbon

D
silver

Solution

In a voltaic cell, the zinc terminal is a negative terminal and the copper terminal is a positive terminal.
Question 3
1 / -0

Choose the incorrect statement among the following.

A
A switch is the source of electric current in a circuit.

B
A switch helps to complete or break the circuit.

C
A switch allows us to use electricity as per our requirement.

D
When the switch is open, there is an air gap between the terminals.

Solution

A switch is a circuit element which is used to break or complete the circuit for the required time. When the switch is open, there is an air gap between the two terminals of the switch. It is not a source of energy.
Question 4
1 / -0

What will happen if you join the two terminals of a cell without connecting them through a switch or bulb?

A
The electric cell will burn due to a large amount of current.

B
The chemical in the electric cell will get used up very fast.

C
The electric cell will get corroded due to flow of a large amount of current.

D
All of the above

Solution

When the two terminals of a cell are joined without connecting them through a switch or bulb, the chemical in the electric cell will get used up very fast.
Question 5
1 / -0

In which of the following circuits will the bulb glow?

A
(1)

B
(2)

C
(3)

D
(4)

Solution

As the string and the rubber band are insulators, the current cannot flow through them. So, the correct answer is (3).
Question 6
1 / -0

What will happen when an extra bulb is inserted in a circuit?

A
The brightness of the first bulb will not change.

B
The brightness of the first bulb will decrease.

C
None of the bulbs will glow.

D
The first bulb will glow dimly, while the newly inserted bulb will glow brightly.

Solution

The brightness of the first bulb will decrease if we add another bulb along with the given bulb because it will also consume the electrical energy.
Question 7
1 / -0

In which of the following circuits will the bulbs not glow?

A
Only (a) and (b)

B
Only (a), (b) and (c)

C
Only (b), (c) and (d)

D
Only (c), (d) and (a)

Solution

In the circuits (b), (c) and (d), the bulbs will not glow as the circuits are not closed.
Question 8
1 / -0

In the above circuit, the lamps don't glow. What is the reason?

A
The connections of the wires are made incorrectly.

B
The lamps are not aligned properly.

C
The battery (A) is not aligned properly.

D
Either the battery (A) or the battery (B) is not aligned properly.

Solution

For the proper circuit, the positive terminal of the battery is connected with the negative terminal of the another battery, which is known as the series combination of the cells.
Question 9
1 / -0

The given circuit diagram shows identical lamps A and B, connected in series with a battery. The lamps glow with normal brightness. A third lamp Z is connected in parallel with lamp B. What will happen to the brightness of lamp A?

A
Dimmer than normal

B
Brighter than normal

C
Normal

D
Very dim (cannot be seen)

Solution

When bulb Z is connected across bulb B, such type of the connection is known as the parallel combination, which decreases the total resistance (opposition to the current). Hence, the current will increase through the circuit. Thus, bulb A will glow brighter than normal.
Question 10
1 / -0

The handles of the tools like pliers, used by electricians for repair work, usually have plastic covers over them. What is the reason?

A
Because plastic is hard

B
Because plastic is an insulator

C
Because plastic is a conductor

D
Because plastic is lightweight

Solution

The handles of the tools like pliers, used by electricians for repair work, usually have plastic covers over them because plastic is a good insulator and it prevents them from electrocution.

Question 11

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

Wool

Copper

Iron

Silver

Solution

Copper is a good conductor of electricity and it is not an insulator.

Question 12
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 13
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 14
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 15
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 16
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 17

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 18
1 / -0

In the given circuit, which of the switches have to be closed so that only A and D bulbs glow?

A
S_1,S₅and S₂

B
S₁, S₅and S₃

C
S₁, S₅ and S₄

D
Any of the given combination

Solution

We have to close the switches S₁ and S₃and S₅ in order to make the bulbs A and D glow.
Question 19
1 / -0

In the given circuit, which of the following switches have to be closed so that only A and E bulbs glow?

A
S₁ and S₄

B
S₁ and S₂

C
S₁ and S₃

D
Not possible

Solution

It is not possible that only A and E bulbs glow. On closing the switches S₁ and S₄, the bulbs A, E and F will glow.
Question 20
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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Electricity and Circuits Test - 6

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Electricity and Circuits Test - 6

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Question 1

It converts chemical energy into electrical energy.

It has a neutral terminal.

It has a positive terminal.

It has a negative terminal.

Solution

Question 2

zinc

copper

carbon

silver

Solution

Question 3

A switch is the source of electric current in a circuit.

A switch helps to complete or break the circuit.

A switch allows us to use electricity as per our requirement.

When the switch is open, there is an air gap between the terminals.

Solution

Question 4

The electric cell will burn due to a large amount of current.

The chemical in the electric cell will get used up very fast.

The electric cell will get corroded due to flow of a large amount of current.

All of the above

Solution

Question 5

(1)

(2)

(3)

(4)

Solution

Question 6

The brightness of the first bulb will not change.

The brightness of the first bulb will decrease.

None of the bulbs will glow.

The first bulb will glow dimly, while the newly inserted bulb will glow brightly.

Solution

Question 7

Only (a) and (b)

Only (a), (b) and (c)

Only (b), (c) and (d)

Only (c), (d) and (a)

Solution

Question 8

The connections of the wires are made incorrectly.

The lamps are not aligned properly.

The battery (A) is not aligned properly.

Either the battery (A) or the battery (B) is not aligned properly.

Solution

Question 9

Dimmer than normal

Brighter than normal

Normal

Very dim (cannot be seen)

Solution

Question 10

Because plastic is hard

Because plastic is an insulator

Because plastic is a conductor

Because plastic is lightweight

Solution

Question 11

Wool

Copper

Iron

Silver

Solution

Question 12

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

S_1,S₅and S₂

S₁, S₅and S₃

S₁, S₅ and S₄

S₁ and S₄

S₁ and S₂

S₁ and S₃