Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 116 · 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 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 right 60°, then left 45°. What does the gyro read now (0° to 359°)?
2. 2.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
3. 3.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
4. 4.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
5. 5.🧭 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 90°. It turns right 90°, then left 90°. What does the gyro read now (0° to 359°)?
6. 6.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) motor volts (d) driver teeth
7. 7.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) stays still (b) turns left (c) goes straight forward (d) turns right
8. 8.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
9. 9.⚙️ A 36-tooth driver gear turns a 24-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
10. 10.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
11. 11.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
12. 12.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
13. 13.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 396 cm?
14. 14.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
15. 15.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a dark tunnel (c) a white surface (d) a black line
16. 16.🧭 A robot faces south. It does: turn left, turn right, turn around. Which way does it face now? (a) west (b) east (c) north (d) south
17. 17.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
18. 18.⬛ The threshold of a light sensor is … (a) the battery size (b) the top speed (c) the black/white cut-off (d) the wheel size
19. 19.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
20. 20.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
21. 21.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
22. 22.⚙️ A 20-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
23. 23.🧭 How many degrees is a right-angle turn? (a) 180° (b) 360° (c) 90° (d) 45°
24. 24.True or false: “spins round and round” is true of a servo motor. (a) False (b) True
25. 25.🦾 A servo moves from 40° to 50°. How many degrees does it turn?
26. 26.⚙️ A motor makes 60 turns a minute with an 8-tooth gear on it. That gear drives a 16-tooth gear. How many turns a minute does the 16-tooth gear make?
27. 27.📡 A robot is 280 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 1 second (in cm)?
28. 28.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 40. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) both sensors (d) neither sensor
29. 29.🛞 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 4 times. How far does the robot roll (in cm)?
30. 30.🔢 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)
31. 31.📡 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points straight up (b) points right (c) points up and right (d) points up and left
33. 33.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) far behind it (c) under the right sensor (d) between the two sensors
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 90°. It turns left 120°, then left 180°, then left 180°. What does the gyro read now (0° to 359°)?
35. 35.🔍 Why do robots need sensors? (a) to use more power (b) to look colourful (c) to know their world (d) to be heavier
36. 36.🛞 Why do most indoor robots use wheels? (a) they look funny (b) they climb stairs (c) fast and easy on floors (d) they float
37. 37.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
39. 39.🔍 Which sensor helps a robot stay balanced upright? (a) a touch sensor (b) a camera (c) a gyro sensor (d) a sound sensor
40. 40.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a gyro sensor (b) a camera (c) a sound sensor (d) a touch sensor

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