Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 578 · 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 light sensor reads below 30 over a black line and above 30 over the white floor. It reads 14. What is under the sensor? (a) the black line (b) the white floor
2. 2.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
3. 3.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 792 cm?
4. 4.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driver turns 18 times. How many times does the driven gear turn?
5. 5.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
6. 6.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
7. 7.📡 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?
8. 8.🛞 Circumference = π × … (a) weight (b) diameter (c) speed (d) radius only
9. 9.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
10. 10.🛞 Which way of moving suits this best: “flying over a field”? (a) tracks (b) propellers (c) wheels (d) legs
11. 11.📡 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?
12. 12.🧭 A robot faces south. It does: turn left, turn left, turn right, turn right. Which way does it face now? (a) west (b) north (c) south (d) east
13. 13.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
14. 14.Which job needs a camera? (a) follow a black line (b) read a QR code (c) stay balanced upright (d) feel a bump into a wall
15. 15.Which of these suits wheels? (a) stepping over wide gaps (b) a long factory floor (c) flying over a field (d) crossing stepping-stones
16. 16.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) driver teeth (d) number of gears
17. 17.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
18. 18.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) never important (c) small (fast, weak) (d) big (slow and strong)
19. 19.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 95. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
20. 20.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) True (b) False
21. 21.True or false: to follow a black line, use a temperature sensor. (a) True (b) False
22. 22.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
23. 23.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 34 cm (c) 340 cm (d) 3 cm
24. 24.🛞 Which way of moving suits this best: “a field of tall boulders”? (a) tracks (b) wheels (c) propellers (d) legs
25. 25.True or false: to read a QR code, use a light sensor. (a) False (b) True
26. 26.📡 A robot is 260 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 5 seconds (in cm)?
27. 27.True or false: “deep mud” suits propellers. (a) True (b) False
28. 28.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
29. 29.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
30. 30.🧭 A robot faces south. It does: turn left, turn left, turn around. Which way does it face now? (a) west (b) north (c) east (d) south
31. 31.🔍 Which sensor helps a robot stay balanced upright? (a) a touch sensor (b) a camera (c) a gyro sensor (d) a distance sensor
32. 32.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22 (b) 22/7 (c) 7/22 (d) 2/7
33. 33.📡 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
34. 34.True or false: to start on a hand clap, use a sound sensor. (a) True (b) False
35. 35.🧭 A robot faces north. It does: turn right, turn right, turn right, turn left. Which way does it face now? (a) west (b) east (c) south (d) north
36. 36.🔍 Which sensor helps a robot warn if motors get hot? (a) a gyro sensor (b) a touch sensor (c) a temperature sensor (d) a light sensor
37. 37.Which job needs a sound sensor? (a) measure a turn angle (b) start on a hand clap (c) find the brightest spot (d) read a QR code
38. 38.🦾 A servo moves from 150° to 40°. How many degrees does it turn?
39. 39.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) goes straight back (b) goes straight forward (c) stays still (d) spins right on the spot
40. 40.🧭 How many degrees is a half turn (turn around)? (a) 90° (b) 45° (c) 360° (d) 180°

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