Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 464 · 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.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
2. 2.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
3. 3.🛞 Which way of moving suits this best: “moving under water”? (a) tracks (b) wheels (c) propellers (d) legs
4. 4.Which job needs a sound sensor? (a) find the brightest spot (b) start on a hand clap (c) know a button is pressed (d) spot a red ball
5. 5.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
6. 6.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
7. 7.🛞 Circumference = π × … (a) radius only (b) speed (c) weight (d) diameter
8. 8.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
9. 9.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is wet (c) black is loud (d) black is hot
10. 10.🦾 A servo moves from 20° to 40°. How many degrees does it turn?
11. 11.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
12. 12.True or false: to read a QR code, use a distance sensor. (a) False (b) True
13. 13.🧭 A robot faces south. It does: turn left, turn around. Which way does it face now? (a) east (b) north (c) south (d) west
14. 14.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 67. What is under the sensor? (a) the black line (b) the white floor
15. 15.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
16. 16.📡 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
17. 17.🔍 What does a gyro sensor measure? (a) sound (b) turning (rotation) (c) temperature (d) colour
18. 18.Which job needs a light sensor? (a) spot a red ball (b) warn if motors get hot (c) follow a black line (d) feel a bump into a wall
19. 19.Which job needs a sound sensor? (a) hear a whistle (b) measure a turn angle (c) follow a black line (d) read a QR code
20. 20.Which of these suits wheels? (a) a hospital corridor (b) stepping over wide gaps (c) moving under water (d) deep mud
21. 21.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
22. 22.⚙️ A 48-tooth driver gear turns a 12-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
23. 23.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
24. 24.Which of these suits tracks? (a) flying over a field (b) a hospital corridor (c) loose sand dunes (d) a flat road
25. 25.📡 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
26. 26.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 55. What is under the sensor? (a) the white floor (b) the black line
27. 27.🧭 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 left 90°, then right 45°. What does the gyro read now (0° to 359°)?
28. 28.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) number of gears (c) wheel size (d) motor volts
29. 29.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 4 times. How far does the robot roll (in cm)?
30. 30.📡 A robot is 260 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 1 second (in cm)?
31. 31.⚙️ A 10-tooth gear drives a 50-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
32. 32.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 1 km (c) 34 cm (d) 3 cm
33. 33.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a goldfish (c) a cow (d) a bat
34. 34.⚙️ An 8-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
35. 35.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
36. 36.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a servo motor (b) a buzzer (c) a fan (d) a DC motor
37. 37.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
38. 38.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True
39. 39.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) zero (c) small (fast, weak) (d) big (slow and strong)
40. 40.🦾 A servo moves from 140° to 80°. How many degrees does it turn?

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