BUZZER

What is buzzer ?

• It is a semiconductor light source that emits light when current flows through it

• It is an audio signaling device, which may be mechanical, electromechanical, or piezoelectric

• It means red, blue and green LEDs

• None of them

Who invented buzzer?

• Thomas Edison

• Nikola Tesla

• Joseph Henry

• Leonardo da Vinci

Finding image of buzzer

• 
• 
• 
• All of them

Which block will you choose if you want to control buzzer

• Show

• Look

• Action

• Sensing

What is the name of this song?

• ABC song

• Happy birthday

• Ten in bed

• None of them

Finding image of RGB LED

• 
• 
• 
• All of them

If you want to program RGB LED, Buzzer, which block you need to choose

• Show

• Looking

• Sensing

• Action

 

If you want to program Motor, which block you need to choose

• Action

• Control

• Events

• Variables

When was the electric buzzer invented ?

• 1730

• 1931

• 1930

• 1831

Hearing range of human

• 20 - 20 000 Hz

• 20 - 16 000

• Above 20 000

• None of them