Working of an Electric Bell

Q.

Out of the following devices which devices use electromagnets?

1. Washing machine

2. Bulb

3. Electric bell

4. Electric heater

Q.

Sound is produced in an electric bell, when:

1. the striker hits the gong

2. the striker moves away from the gong

3. the electromagnet is switched on

4. none of the above

Q.

For the following devices:

I: Fuse

II: Electric Bulb

III: Electric Bell

Select the correct option.

1. I and III work on the principle of Magnetic effect of current

2. I and II work on the principle of Heating effect of current

3. II and III work on the principle Magnetic effect of current

4. III works on the principle Heating effect of current

Q.

We use a soft iron core in an electromagnet. Give a reason.

Q. Which of the following is the input and output of an electric bell respectively?

1. Mechanical energy
   Sound energy
2. Electrical energy
   Mechanical energy
3. Electrical energy
   Sound energy
4. Electrical energy
   Magnetic energy

Q. What are the possible way(s) by which a strong electromagnet can be made?​

​1. Decrease the number of turns in the coil.​
2. Increase the current in the coil.​
3. Use a plastic core inside the coil.​
4. Reverse the current direction in the coil.

1. 1 and 3 only​
2. 1, 2 and 3​
3. 1, 2 and 4​
4. 2 only​

Q. Working of solenoid motor

Q. Why spark plug not required in diesel vehicles whereas required in petrol vehicles?

Q.

The striker of the electric bell moves due to attractive force of the electromagnet.

Say True or False.

1. True

2. False

Q.

Define

(1) Magnetic field

(2) Solenoid

(3) Electric motor

Q. Which of the following is the input and output of an electric bell respectively?

1. Mechanical energy
   Sound energy
2. Electrical energy
   Mechanical energy
3. Electrical energy
   Sound energy
4. Electrical energy
   Magnetic energy

Q. What are the possible way(s) by which a strong electromagnet can be made?​

​1. Decrease the number of turns in the coil.​
2. Increase the current in the coil.​
3. Use a plastic core inside the coil.​
4. Reverse the current direction in the coil.

1. 1 and 3 only​
2. 1, 2 and 3​
3. 1, 2 and 4​
4. 2 only​

Q.

Which of the following is correct choice for energy conversion in an electric bell?

1. Electrical energy to sound energy

2. Mechanical energy to sound energy

3. Electrical energy to magnetic energy

4. Electrical energy to mechanical energy

Q.

Identify the component of the electric circuit shown below.

Q. What makes and breaks the circuit in an electric bell?

1. Gong
2. Contact screw
3. Electromagnet
4. Striker

Q.

Name the following.

An application of electromagnet

Q. Which of the following energy conversion takes place in an electric bell?

1. Electrical energy to magnetic energy

2. Mechanical energy to sound energy

3. Electrical energy to mechanical energy

4. Electrical energy to sound energy

Q.

For the following devices:

I: Fuse

II: Electric Bulb

III: Electric Bell

Select the correct option.

1. III works on the principle Heating effect of current

2. I and II work on the principle of Heating effect of current

3. II and III work on the principle Magnetic effect of current

4. I and III work on the principle of Magnetic effect of current

Q. Which of the following is the input and output of an electric bell respectively?

1. Mechanical energy
   Sound energy
2. Electrical energy
   Mechanical energy
3. Electrical energy
   Sound energy
4. Electrical energy
   Magnetic energy

Q.

Electric bell works on which of the following effects of current?

1. Magnetic effect

2. Chemical effect

3. Heating effect

4. None of the above

Q.

Select the correct option:

1. A – Striker, B- Electromagnet, C –Contact Screw, D - Gong

2. A – Striker, B- Gong, C – Contact Screw, D – Electromagnet

3. A – Striker, B- Contact Screw, C – Electromagnet, D - Gong

4. A – Gong, B- Contact Screw, C – Electromagnet, D - Striker

Q. An electric bell works on the ______ of electric current.

1. Chemical effect
2. Heating effect
3. (a) and (c) above.
4. Magnetic effect