Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 791 · 40 questions

Robot tip (Find the topic, use the formula): Find the topic: moving, motors, gears, wheels, sensors, echo, line or gyro. Use the rule: teeth × turns; circumference × turns; 17 cm per ms of echo; below the threshold = black; right adds degrees. Check: put your answer back into the rule.

1. 1.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22/7 (b) 22 (c) 7/22 (d) 2/7
2. 2.🧭 A robot should turn right 180°, but its gyro shows it turned 165°. How many degrees must it turn more to the right?
3. 3.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
4. 4.True or false: to start on a hand clap, use a light sensor. (a) False (b) True
5. 5.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
6. 6.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 180° (c) 360° (d) 90°
7. 7.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 90°. It turns right 135°, then right 180°, then left 60°. What does the gyro read now (0° to 359°)?
8. 8.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
9. 9.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
10. 10.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
11. 11.📡 A robot is 120 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 3 seconds (in cm)?
12. 12.📡 A robot is 170 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 9 seconds (in cm)?
13. 13.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
14. 14.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a flat wall (c) a soft foam cushion (d) a metal door
15. 15.True or false: “stepping over wide gaps” suits legs. (a) True (b) False
16. 16.Which of these suits propellers? (a) a field of tall boulders (b) stepping over wide gaps (c) flying over a field (d) a hospital corridor
17. 17.🧭 A robot spins 60° every second. How many seconds does it take to turn 60°?
18. 18.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) spins left on the spot (b) goes straight forward (c) goes straight back (d) turns right
19. 19.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a DC motor (c) a servo motor (d) a fan
20. 20.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
21. 21.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) legs (b) propellers (c) wheels (d) tracks
22. 22.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
23. 23.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 90°. It turns left 60°, then right 180°, then right 45°. What does the gyro read now (0° to 359°)?
24. 24.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) spins left on the spot (b) spins right on the spot (c) stays still (d) turns left
25. 25.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
26. 26.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
27. 27.True or false: “the output turns faster” happens when a small gear drives a big one. (a) False (b) True
28. 28.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
29. 29.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 154 cm?
30. 30.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 40. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
31. 31.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 528 cm?
32. 32.🧭 How many degrees is a full turn? (a) 360° (b) 180° (c) 90° (d) 100°
33. 33.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is hot (c) black is wet (d) black is loud
34. 34.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a light sensor (d) a buzzer
35. 35.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they are round (c) they spread the weight (d) they spin in the air
36. 36.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 0°. It turns right 120°, then left 90°. What does the gyro read now (0° to 359°)?
37. 37.📡 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
38. 38.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
39. 39.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) slower but stronger (c) faster but weaker (d) not at all
40. 40.Which job needs a touch sensor? (a) stop before a wall (b) know a button is pressed (c) measure a turn angle (d) spot a red ball

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