Electric Current and its Effects Test

Result

Electric Current and its Effects Test - 9

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Weekly Quiz Competition

Question 1
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What happens to a circuit when the switch is off?

A
The circuit is complete

B
There is a gap in the circuit

C
Electricity flows continuously

D
Electricity flows discontinuously

Solution

The switch acts as a connecting part of a circuit. When the switch is off, the circuit is incomplete as the connection is broken in the place of the switch. So, no current can pass through this broken circuit.
Question 2
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What must happen for an electromagnet to have a magnetic field?

A
It must be heated.

B
It must be touching another magnet.

C
It must be lined up with earth's magnetic field.

D
It must be connected to an electrical source.

Solution

Electromagnets are temporary magnets that have the property of a magnetic only when they are connected to an electrical source.
Question 3
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Directions For Questions

Complete the sentence by using the correct word from the given options.

...view full instructions

A __________ is a combination of two or more cells connected end to end.

A
Battery

B
Dynamo

C
Coil

D
Switch

Solution

A battery is a combination of two or more cells connected end to end such that positive terminal of one cell is connected to negative terminal of next cell.
Question 4
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In electric bells, electrical energy transform into ............. energy.

A
Mechanical

B
Magnetic

C
Sound

D
Light

Solution

An electric bell is a mechanical or electronic bell that functions by means of an electromagnet. When an electric current is applied, it produces a repetitive buzzing, clanging or ringing sound. So clearly the electrical energy is converting into sound energy.
Question 5
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When the switch of an electric bell is on then electric current in it :

A
Flows and stops in succession

B
Flows continuously

C
First flows in one direction and after sometime in other direction

D
Flows in beginning and then stops forever

Solution

The bell works on the principle of electromagnetism which says that when an electric current flows through the coil, the rods become magnetic and attract a piece of iron attached to a clapper. And the clapper hits the cap and comes back as the current stops, and hence the bell rings. So the current flows and stops in succession. And in this way the bell rings.
Question 6
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What is symbol of switch in 'OFF' position?

A

B

C

D

Solution

Second option is the symbol of switch in 'OFF' position. It shows the switch is OPEN.

Answer-(B)
Question 7
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Which material is used for making the armature of an electric bell?

A
Soft iron

B
Hard iron

C
Nickel

D
Any magnetic material

Solution

An electric bell is a mechanical or electronic bell that functions by means of an electromagnet. When an electric current is applied, it produces a repetitive buzzing, clanging or ringing sound.

The material used for making the armature of an electric bell is soft iron which can induce magnetism rapidly.Hence it can serve as a good electromagnet.
Question 8
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The components required to make a simple series circuit to light a bulb are

A
Wires and cell

B
Cell and switch

C
Bulb and wires

D
Both B and C

Solution

The component required to make a simple series circuit to light a bulb are
$$\rightarrow$$ Cells
$$\rightarrow$$ Switch
$$\rightarrow$$ Bulbs
$$\rightarrow$$ Wires
Question 9
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When electric current passes through the filaments of a bulb, it starts emitting light due to:

A
Heating effect of electric current

B
Magnetic effect of electric current

C
Chemical effect of electric current

D
Lighting effect of electric current

Solution

When electric current passes through the filaments of the bulb, it starts emitting light due to the heating effect of the electric current. Most of the power consumed by the filament appears as heat, but a small part of it is in the form of light which is radiated through the filamaent.
Question 10
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What is symbol of battery?

A

B

C

D

Solution

First option is the symbol of battery. The short and longer bar represent the negative and positive terminals respectively of each cell in the battery.

Answer-(A)