Electric Current and its Effects Test

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Electric Current and its Effects Test - 11

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Weekly Quiz Competition

Question 1
1 / -0

During a doorbell ringing

A
Current always flows in the circuit

B
Electromagnet is always present

C
Striker is always in contact with metal gong

D
Striker always repeatedly hits metal gong

Solution

Striker repeatedly hits the metal gong when doorbell is ringing.
This can be observed in regular bells used at homes.
Question 2
1 / -0

Electric doorbell

A
Always consume power

B
Consume power only when switch is pressed

C
Do not consume power practically and needs only starting power

D
Can't say

Solution

When the switch is pressed, the circuit completes and ringing begins. Hence, electrical energy is converted to sound energy. As the switch is released, no current flows, and no energy is consumed.
Question 3
1 / -0

Armature is pulled towards the spring when it strikes the gong because

A
The electromagnet gets demagnetized

B
The current flow breaks

C
Spring effect

D
All of the above

Solution

The working of an electric bell 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 magnetised 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 demagnetising 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 break circuit.
Question 4
1 / -0

What will happen if the striker of a doorbell is kept in a magnetic field in a direction perpendicular to motion of striker

A
Striker Hits Harder

B
Striker rebounds harder

C
More current is drawn

D
No effect

Solution

Striker is attracted to the electromagnet when circuit is complete. When external magnetic field perpendicular to motion of striker is applied no effect is produced in the functioning. The reason for above is that motion of striker is hindered mechanically in that direction.
Question 5
1 / -0

Exposed Electric doorbell can be damaged by

A
Mechanical damage

B
High Electric currents

C
Humidity

D
All of the above

Solution

i) Mechanical Damage to metal gong or striker may hinder the working of the bell.

ii) High electric currents may cause heating and burning of an electrical circuit.

iii) Humidity may cause a short circuit between two unconnected wires, causing high electric currents and damage.
Question 6
1 / -0

Match the following
1. Horse-shoe magnet a. Holds the armature in place
2. Armature b. Electromagnet
3. Spring strip c. Passes electric current to the spring strip
4. Adjusting screw d. Fixed to the spring strip

A
$$1 - d, 2 - a, 3 - c, 4 - b$$

B
$$1 - a, 2 - c, 3 - b, 4 - d$$

C
$$1 - b, 2 - d, 3 - a, 4 - c$$

D
$$1 - c, 2 - b, 3 - d, 4 - a$$

Solution

The main parts of an electric bell are horse-shoe magnet, soft iron armature, spring strip, gong, hammer, adjusting screw, switch, and battery. The horse-shoe magnet acts like an electromagnet in the presence of current and attracts the iron armature that is fixed to the spring strip. When the spring strip comes in contact with the adjusting screw the circuit gets completed and current passes through it.
Question 7
1 / -0

Which of the following symbol is used for capacitance in circuits?

A

B

C

D

Solution

The second option shows the symbol of capacitance in electric circuit.

Answer-(B)
Question 8
1 / -0

What does this symbol mean in electric circuit?

A
A C power source

B
D C power source

C
current generator

D
none of these

Solution

The given symbol is used for $$AC$$ source of electric current in an electric circuit.

Answer-(A)
Question 9
1 / -0

What does this symbol mean in electric circuit?

A
Switch

B
Cell

C
Resistance

D
Battery

Solution

The given symbol is switch. Used in the electric circuits.
An electric switch is a device that interrupts the electron flow in a circuit. Switches are primarily binary devices: either fully on or off and light switches have a simple design. When the switch is turned off, the circuit breaks, and the power flow is interrupted. Circuits consist of a source of power and load.
Question 10
1 / -0

Which component is this?

A
capacitance

B
resistance

C
battery

D
inductance

Solution

The given picture is of a $$resistance$$.

Answer-(B)

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Re-Attempt Weekly Quiz Competition

1. Horse-shoe magnet	a. Holds the armature in place
2. Armature	b. Electromagnet
3. Spring strip	c. Passes electric current to the spring strip
4. Adjusting screw	d. Fixed to the spring strip

Electric Current and its Effects Test - 11

Result

Electric Current and its Effects Test - 11

Score

-

Rank

-

SHARING IS CARING

Question 1

Current always flows in the circuit

Electromagnet is always present

Striker is always in contact with metal gong

Striker always repeatedly hits metal gong

Solution

Question 2

Always consume power

Consume power only when switch is pressed

Do not consume power practically and needs only starting power

Can't say

Solution

Question 3

The electromagnet gets demagnetized

The current flow breaks

Spring effect

All of the above

Solution

Question 4

Striker Hits Harder

Striker rebounds harder

More current is drawn

No effect

Solution

Question 5

Mechanical damage

High Electric currents

Humidity

All of the above

Solution

Question 6

$$1 - d, 2 - a, 3 - c, 4 - b$$

$$1 - a, 2 - c, 3 - b, 4 - d$$

$$1 - b, 2 - d, 3 - a, 4 - c$$

$$1 - c, 2 - b, 3 - d, 4 - a$$

Solution

Question 7

Solution

Question 8

A C power source

D C power source

current generator

none of these

Solution

Question 9

Switch

Cell

Resistance

Battery

Solution

Question 10

capacitance

resistance

battery

inductance

Solution

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