Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 766 · 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 sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a touch sensor (c) a gyro sensor (d) a camera
2. 2.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
3. 3.🧭 A robot spins 30° every second. How many seconds does it take to turn 330°?
4. 4.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
5. 5.🛞 Which way of moving suits this best: “flying over a field”? (a) propellers (b) tracks (c) wheels (d) legs
6. 6.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
7. 7.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
8. 8.⚙️ A small gear drives a big gear. The big gear turns … (a) faster and weaker (b) not at all (c) at the same speed (d) slower but stronger
9. 9.🧭 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 180°. It turns right 60°, then left 90°. What does the gyro read now (0° to 359°)?
10. 10.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
11. 11.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs forward. What does the robot do? (a) spins right on the spot (b) goes straight back (c) spins left on the spot (d) turns right
12. 12.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 4 (c) 3 (d) 2
13. 13.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a servo (c) a caster wheel (d) a track
14. 14.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
15. 15.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a wooden box (c) a soft foam cushion (d) a metal door
16. 16.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
17. 17.📡 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?
18. 18.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 10. Which sensor is over the black line? (a) the left sensor (b) both sensors (c) the right sensor (d) neither sensor
19. 19.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a DC motor (b) a servo motor
20. 20.True or false: to stay balanced upright, use a sound sensor. (a) True (b) False
21. 21.🦾 A servo moves from 80° to 40°. How many degrees does it turn?
22. 22.🧭 How many degrees is a full turn? (a) 180° (b) 360° (c) 90° (d) 100°
23. 23.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 8 times. How many times did the driver turn?
24. 24.🧭 A robot should turn right 45°, but its gyro shows it turned 52°. How many degrees must it turn back to the left?
25. 25.🧭 What does a gyro help a robot do? (a) hear claps (b) smell smoke (c) see colours (d) turn by exact angles
26. 26.⚙️ A 10-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
27. 27.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
28. 28.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) add more wheels (d) shake it
29. 29.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) sound is slow (c) the sensor is half (d) it goes there and back
30. 30.🧭 A robot spins 90° every second. How many seconds does it take to turn 270°?
31. 31.🧭 How many degrees is a right-angle turn? (a) 360° (b) 90° (c) 180° (d) 45°
32. 32.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 990 cm?
33. 33.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
34. 34.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
35. 35.True or false: “a muddy building site” suits tracks. (a) False (b) True
36. 36.🧭 A robot should turn right 180°, but its gyro shows it turned 172°. How many degrees must it turn more to the right?
37. 37.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) sound too high to hear (c) water drops (d) radio music
38. 38.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) wheel size (c) motor volts (d) driver teeth
39. 39.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 25. What is under the sensor? (a) the white floor (b) the black line
40. 40.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its circumference (c) its radius (d) its weight

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