ALP Sec 2

What is the colour of the light obtained when red, green and blue light are mixed together?

• Black

• White

• Purple

• Orange

Which of the following is true for a push button?

• It opens the circuit when it is pressed

• It stops the output device when it is pressed

• It can act as a switch

• It uses more than 2 pins

Which of the following breadboard layout shows the correct connection of a working circuit?

• A

• B

• C

• D

Which of the following is not true for a force sensitive resistor?

• It is a fixed resistor

• It is a variable resistor

• It can be used to detect changes in force

• It can be used to detect changes in pressure

What is the function of void setup ()

• Runs the steps before setting the variables

• Runs the steps once, when the sketch starts

• Runs the steps over and over again

• Stops the running of the steps

What is an ultrasonic sensor typically used for?

• Distance measurement

• Light intensity measurement

• Measuring loudness of audible sound

• Heat detection

What is the approximate speed of sound in air?

• 30 m/s

• 340 m/s

• 3400 m/s

• 300 000 000 m/s

Why are human beings not able to hear ultrasound?

• It is a sound only meant for animals to hear

• It is so soft that it cannot be heard

• It is travelling so fast it cannot be heard

• It has a frequency which is above the human range of audible frequencies

Which of the following correctly identify the two components?

• A

• B

• C

• D

What happens when a flex sensor is bent?

• It produces light

• It produces electricity

• It’s resistance changes

• None of the properties change