Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 265 · 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.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) radio music (c) water drops (d) sound too high to hear
2. 2.🧭 A robot spins 15° every second. How many seconds does it take to turn 270°?
3. 3.True or false: “a hospital corridor” suits legs. (a) True (b) False
4. 4.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 1 km (c) 34 cm (d) 3 cm
5. 5.🦾 A servo moves from 180° to 0°. How many degrees does it turn?
6. 6.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 64. What is under the sensor? (a) the black line (b) the white floor
7. 7.🛞 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) turns right (b) turns left (c) stays still (d) spins right on the spot
8. 8.True or false: “holds a set angle” is true of a servo motor. (a) True (b) False
9. 9.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 30 times. How many times does the driven gear turn?
10. 10.⚙️ The gear fixed to the motor is called the … (a) tyre (b) idler gear (c) driver gear (d) driven gear
11. 11.⚙️ A 30-tooth driver gear turns a 15-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
12. 12.⚙️ A 36-tooth driver gear turns a 12-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
13. 13.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
14. 14.🧭 A robot faces west. It does: turn around, turn right, turn around, turn left. Which way does it face now? (a) north (b) east (c) west (d) south
15. 15.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 85. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) neither sensor (d) both sensors
16. 16.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a servo (c) a track (d) a caster wheel
17. 17.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 18 times. How many times does the driven gear turn?
18. 18.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is wet (c) black soaks up light (d) black is hot
19. 19.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 38. What is under the sensor? (a) the black line (b) the white floor
20. 20.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
21. 21.True or false: “a field of tall boulders” suits legs. (a) True (b) False
22. 22.🔍 Which sensor helps a robot measure a turn angle? (a) a sound sensor (b) a gyro sensor (c) a light sensor (d) a camera
23. 23.🔍 A light sensor gets the most reflected light from … (a) a white surface (b) a black surface (c) a black line (d) a dark tunnel
24. 24.📡 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)?
25. 25.⚙️ A motor makes 80 turns a minute with a 12-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
26. 26.🧭 How many degrees is a full turn? (a) 100° (b) 180° (c) 360° (d) 90°
27. 27.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
28. 28.⚙️ A 20-tooth driver gear turns a 10-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
29. 29.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
30. 30.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22 (b) 7/22 (c) 2/7 (d) 22/7
31. 31.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) never important (c) zero (d) big (slow and strong)
32. 32.🔍 Which sensor helps a robot know a button is pressed? (a) a temperature sensor (b) a gyro sensor (c) a camera (d) a touch sensor
33. 33.⚙️ 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?
34. 34.⬛ A reading below the threshold means the sensor is over … (a) water (b) black (c) white (d) the sky
35. 35.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
36. 36.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
37. 37.🦾 A servo moves from 60° to 30°. How many degrees does it turn?
38. 38.⚙️ A 20-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
39. 39.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
40. 40.⚙️ A 20-tooth driver gear turns an 80-tooth driven gear. The driver turns 40 times. How many times does the driven gear turn?

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