Lesson 1 · Meet the XRP — Knowledge Checks

Why does the XRP have two motors instead of just one?

1. A.So it can carry heavier loads
2. B.So each side can move at a different speed, which lets the robot steer
3. C.So there is a spare motor in case one fails
4. D.One motor drives, the other only brakes

Answer Why?

Which part is the 'brain' that runs your program and tells the motors what to do?

1. A.The battery
2. B.The reflectance sensor
3. C.The controller board
4. D.The caster wheel

Answer Why?

Your robot is brand new. Why can't you just connect to it over Bluetooth right away?

1. A.Bluetooth only works with Python, not Blockly
2. B.It has to be connected by USB once first, so XRP Code can set up the software on the robot
3. C.Bluetooth is slower, so uploads would fail
4. D.You can — Bluetooth always works out of the box

Answer Why?

A classmate built a program in XRP Code on Safari, but when they click CONNECT their robot never appears in the list. What is the most likely reason?

1. A.The robot is broken
2. B.Safari cannot connect to the robot — XRP Code needs Chrome or Edge for that
3. C.The program has too many blocks
4. D.They need to create an account first

Answer Why?

You place two Straight blocks one above the other. When you run the program, what happens?

1. A.Both blocks run at the same time
2. B.The blocks run in order — the first finishes, then the second starts
3. C.Only the top block runs
4. D.The robot picks one block at random

Answer Why?

True or false: you can run a program on the robot without uploading it.

1. A.True
2. B.False — the program must be uploaded over USB before the robot can run it

Answer Why?

True or false: the reflectance sensors detect color.

1. A.True
2. B.False — they detect light vs. dark (like a white floor vs. a black line), not color

Answer Why?