Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 161 · 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 20-tooth driver gear turns a 60-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
2. 2.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the battery size (c) the top speed (d) the wheel size
3. 3.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
4. 4.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) motor volts (d) driver teeth
5. 5.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
6. 6.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) big (slow and strong) (c) zero (d) small (fast, weak)
7. 7.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 550 cm?
8. 8.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
9. 9.🦾 A servo moves from 20° to 130°. How many degrees does it turn?
10. 10.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) turns right (b) stays still (c) goes straight back (d) spins right on the spot
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) No (b) Yes
12. 12.📡 A robot is 270 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 9 seconds (in cm)?
13. 13.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points right (b) points left (c) points straight up (d) points up and right
14. 14.🧭 A robot faces east. It does: turn left, turn around, turn right. Which way does it face now? (a) east (b) north (c) west (d) south
15. 15.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 7/22 (c) 22 (d) 22/7
16. 16.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
17. 17.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) True (b) False
18. 18.🧭 A robot should turn right 90°, but its gyro shows it turned 86°. How many degrees must it turn more to the right?
19. 19.Which job needs a gyro sensor? (a) start on a hand clap (b) know a button is pressed (c) stay balanced upright (d) follow a black line
20. 20.⚙️ A 36-tooth driver gear turns a 12-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
21. 21.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
22. 22.🛞 Which way of moving suits this best: “a long factory floor”? (a) propellers (b) tracks (c) wheels (d) legs
23. 23.🔦 A light sensor reads 40 over black and 60 over white. A good threshold is halfway between them. What is it?
24. 24.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) it stops for ever (c) it jumps (d) one wheel runs faster
25. 25.🧭 How many degrees is a right-angle turn? (a) 45° (b) 90° (c) 360° (d) 180°
26. 26.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
27. 27.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
28. 28.🧭 A robot spins 30° every second. How many seconds does it take to turn 270°?
29. 29.🛞 The diameter of a wheel is how many times its radius? (a) 2 (b) 4 (c) 1 (d) 3
30. 30.Which job needs a distance sensor? (a) warn if motors get hot (b) find the brightest spot (c) measure how far a box is (d) know a button is pressed
31. 31.⚙️ A motor makes 200 turns a minute with a 15-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
32. 32.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
33. 33.⚙️ A motor makes 220 turns a minute with a 15-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
34. 34.🧭 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 60°, then left 60°. What does the gyro read now (0° to 359°)?
35. 35.Which job needs a touch sensor? (a) stop before a wall (b) spot a red ball (c) hear a whistle (d) know a button is pressed
36. 36.🧭 A robot faces north. It does: turn around, turn right, turn right. Which way does it face now? (a) west (b) east (c) north (d) south
37. 37.⚙️ A 45-tooth driver gear turns a 15-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
38. 38.🧭 A robot should turn right 180°, but its gyro shows it turned 183°. How many degrees must it turn back to the left?
39. 39.Which of these suits wheels? (a) a field of tall boulders (b) loose sand dunes (c) stepping over wide gaps (d) a smooth classroom floor
40. 40.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?

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