Electric Bell

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

1. Mechanical energy to sound energy

2. Electrical energy to mechanical energy

3. Electrical energy to sound energy

4. Electrical energy to magnetic energy

Q.

Which of the following effects of current makes the electric bell work?

1. None of the above

2. Heating effect

3. Magnetic effect

4. Chemical effect

Q. Which part of the electric bell vibrates to produce the sound that we listen?

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

Q. Arrange the following statements using the working of an electric bell.

(i) Electromagnet loses its magnetism and the spring arm restores the striker to its original position.
(ii) The current flows through the circuit and electromagnet attracts the striker towards it.
(iii) The striker hits the gong and the circuit is broken.

1. (i), (ii), (iii)
2. (iii), (i), (ii)
3. (iii), (ii), (i)
4. (ii), (iii), (i)

Q. Which of the following is not an application of electromagnets?

1. Loudspeaker
2. Fan
3. Switch
4. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Motors

Q.

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

1. Heating effect

2. Magnetic effect

3. Chemical effect

4. None of the above

Q. An electric bell has all the following parts except _____.

1. striker
2. contact screw
3. graphite rod
4. gong

Q.

In an electric bell, when the electromagnet pulls the iron strip, it also breaks the circuit. The current through the coil stops flowing. In this case, will the coil remain an electromagnet? How does an electric bell ring then?

Q. Which of the following is not an application of electromagnets?

1. Loudspeaker
2. Fan
3. Switch
4. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Motors

Q.

A sound is produced in an electric bell, when:

1. none of the above

2. the striker hits the gong

3. the electromagnet is switched on

4. the striker moves away from the gong

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

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

Q. Sometimes, a crackling sound is heard while taking off a sweater during winters. Explain.

Q. Why does air when passes through small holes produces sounds??

Q.

Select the correct option:

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

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

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

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

Q. Which part makes the hammer strike the gong in an electric bell?

1. Gong
2. Switch
3. Cell
4. Magnet

Q. Sound is produced by a body when it vibrates.

1. False
2. True