Electric Current and its Effects Test

Result

Electric Current and its Effects Test - 10

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Weekly Quiz Competition

Question 1
1 / -0

What is the symbol of wire in an electrical circuit?

A

B

C

D

Solution

Wire is represented by a straight line joining two points.

Hence, the correct option is D.
Question 2
1 / -0

What will happen if the strip in a doorbell loses its flexibility?

A
Striker may break if current is large.

B
After hitting the metal gong, it never returns to original position and only a single sound is produced.

C
System of doorbell breaks

D
Both A and B

Solution

Because of lack of flexibility, striker will resist change of motion more and may break if current is large.
Without flexibility, no rebounding force is present and striker will not return to its original position.
Question 3
1 / -0

Why doorbell rings repeatedly when switch is pressed

A
Because of nature of current

B
Because electrical switch is built in such a manner

C
Because of make and break arrangement

D
Because of slight humidity in the circuit

Solution

Make and break arrangement causes the striker to repeatedly hit the metal gong as long as the switch is pressed. When the circuit is complete, electromagnet attracts the striker which hits metal gong. As soon as the striker moves, circuit breaks and electromagnet is inactive. Because of flexibility of striker, it moves back to its original position. As soon as it reaches original position, the circuit is complete. This process repeats continuously as long as the switch remains pressed.
Question 4
1 / -0

(symbol) is -

A
Electric bulb

B
Switch in 'ON' position

C
Switch in 'OFF' position

D
Battery

Solution

The given symbol is the symbol of the Electric bulb used in a circuit diagram.

Answer-(A)
Question 5
1 / -0

This symbol is -

A
Switch in 'OFF' position

B
Electric bell

C
Switch in 'ON' position

D
Electric bulb

Solution

The given symbol is the symbol of a switch in the 'ON' position. The switch is closed as both of its terminals are connected and provide a closed path for the current to flow through it.

Answer-(C)
Question 6
1 / -0

What is the use of flexibility strip in a doorbell?

A
It brings back striker to its original position

B
It supports the motion of the striker

C
It completes the electric circuit flexibly

D
Its a safety precaution

Solution

Without the flexibility strip, the striker will not come back to original position when the electrical circuit breaks.
Question 7
1 / -0

Which process is applied on a circuit for the working of an electric bell?

A
Magnetization

B
Make and break

C
Both A and B

D
None of the above

Solution

The working of an electric magnet is based on the magnetic effect of the current. When the key is pressed the circuit gets completed and current passes through it causing the electromagnet to get magnetized which in turn attracts the armature. This movement of the armature causes the hammer to strike the gong. However, when the armature moves towards the gong the connection between the spring strip and adjusting screw is lost which breaks the circuit, and the current flow is stopped thus demagnetizing the electromagnet. This causes the armature to return to its original position and it is thus pulled back due to the spring effect of the spring strip. This process is called a make and brake circuit.
Question 8
1 / -0

Choose the symbol of a single cell

A

B

C

D

Solution

A cell has one positive end and one negative end. In the symbol of a single cell, there is a longer line which represents the positive end and a shorter line which represents the negative end.
Question 9
1 / -0

Why are switches/keys used in a circuit?

A
To save power

B
To protect the system

C
To control a device

D
All of above

Solution

Switches allow the user of gadget to turn off the gadget when not required. Hence, A and C follows.
Using a device only when required reduced the wear and tear and protects the system. Hence, B is correct. hence A , b and C all are correct that's why option D is answer.
Question 10
1 / -0

The hammer hits the gong in an electric bell because

A
It has electric charge

B
It displays the spring effect

C
It is attracted towards the electro-magnet

D
All of the above

Solution

The working of an electric magnet is based on the magnetic effect of current. When the key is pressed the circuit gets completed and current passes through it causing the electromagnet to get magnetized which in turn attracts the armature. This movement of the armature causes the hammer to strike the gong.