Colour and Ultrasonic Sensors

Why might the Ultrasonic sensors be preferred over Touch Sensors for detecting walls and obstacles?

• Hitting wall could damage the wall

• Hitting a wall could damage the robot

• It is quicker to detect obstacles at a distance

• All of them

What does the Wait Block wait for before playing the "Hello" sound?

• The Ultrasonic Sensor to detect an object less than 50 cm away

• The Ultrasonic Sensor to detect an object more than 50 cm away

• The robot to travel less than 50 cm

• The Ultrasonic Sensor's reading to change by up to 50 cm

How do you select the sound file the robot plays?

• By clicking in the upper-right "File Name" blank on the block

• By speaking into the speakers of the EV3

• By adding a File Block

• Are you kidding? Robots don't speak!

What is the question mark on the wait block / Ultrasonic called?

• Limit

• Threshold

• Parametre

• Echolocation

What does this code do?

• go forward until it "sees" something 30 cm away then stop

• Reverse until it "sees" something 30 cm away then stop

• Reverse 50 rotations

• go forward 50 rotations

What will the robot need to detect with the Colour Sensor?

• The speed of the robot

• Distance from the vehicle in front of the robot

• Width of the road

• Colour of a traffic light

What does this programme do?

• Wait for the Colour Sensor to see a Red object, then move forward

• Wait for the Colour Sensor to see a Green object, then move forward

• Wait until an object is moved out of the way, then move forward

• Move forward waits until it sees a Green object, then stops

When multiple colours are checked in the "Set of Colours" area, what will the Wait Block do?

• Wait for ANY of the colours to be seen

• Wait for ALL of the colours to be seen at the same time

• Wait for ALL of the colours to be seen at least once each

• Wait for ALL of the colours to be seen in the order indicated by the numbers

EV3 Colour Sensor can detect ? different colours

• 7

• 6

• 8

• 6

What does the No Colour "colour" mean in the Set of Colours menu?

• it doesn't know which colour it is

• "No Colour" is the same as Black or White

• It really means NO COLOUR is being detected

• It doesn't see anything