Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 770 · 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.True or false: to spot a red ball, use a light sensor. (a) False (b) True
2. 2.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
3. 3.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 180° (c) 360° (d) 45°
4. 4.True or false: “the output turns faster” happens when a small gear drives a big one. (a) True (b) False
5. 5.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) paint it red (d) add more wheels
6. 6.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
7. 7.⚙️ A 15-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
8. 8.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
9. 9.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) driver teeth (d) motor volts
10. 10.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
11. 11.⚙️ A motor makes 80 turns a minute with an 8-tooth gear on it. That gear drives a 32-tooth gear. How many turns a minute does the 32-tooth gear make?
12. 12.🦾 A servo program runs:
    angle = 0
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
13. 13.True or false: to know a button is pressed, use a touch sensor. (a) True (b) False
14. 14.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a wheel (c) an input (d) a gear
15. 15.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a cow (c) a bat (d) a snail
16. 16.🛞 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) stays still (b) spins left on the spot (c) turns left (d) goes straight forward
17. 17.⚙️ A 10-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
18. 18.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
19. 19.🛞 How does a two-wheeled robot with no steering turn? (a) it stops for ever (b) it jumps (c) one wheel runs faster (d) it uses a sail
20. 20.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driver turns 27 times. How many times does the driven gear turn?
21. 21.🦾 A servo moves from 150° to 90°. How many degrees does it turn?
22. 22.🧭 How many degrees is a full turn? (a) 180° (b) 90° (c) 360° (d) 100°
23. 23.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
24. 24.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
25. 25.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) radio music (c) sound too high to hear (d) water drops
26. 26.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 110 cm?
27. 27.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
28. 28.🔍 What does a gyro sensor measure? (a) sound (b) temperature (c) colour (d) turning (rotation)
29. 29.🦾 A servo moves from 20° to 110°. How many degrees does it turn?
30. 30.🛞 The diameter of a wheel is how many times its radius? (a) 2 (b) 1 (c) 3 (d) 4
31. 31.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
32. 32.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a soft foam cushion (c) a metal door (d) a flat wall
33. 33.🧭 A robot faces west. It does: turn right, turn around, turn around. Which way does it face now? (a) south (b) north (c) west (d) east
34. 34.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
35. 35.🧭 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 left 45°, then right 90°. What does the gyro read now (0° to 359°)?
36. 36.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
37. 37.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 704 cm?
38. 38.⚙️ A 12-tooth gear drives a 48-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
39. 39.True or false: to stay balanced upright, use a gyro sensor. (a) False (b) True
40. 40.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times faster (c) 3 times bigger (d) 3 times slower

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