Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 653 · 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 servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
2. 2.🧭 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 60°, then left 90°, then right 135°. What does the gyro read now (0° to 359°)?
3. 3.⚙️ A big gear drives a small gear. The small gear turns … (a) not at all (b) at the same speed (c) faster but weaker (d) slower but stronger
4. 4.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
5. 5.True or false: “a long factory floor” suits wheels. (a) True (b) False
6. 6.🧭 A robot faces west. It does: turn right, turn around, turn around. Which way does it face now? (a) south (b) north (c) west (d) east
7. 7.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
8. 8.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
9. 9.⚙️ A motor makes 350 turns a minute with a 10-tooth gear on it. That gear drives a 50-tooth gear. How many turns a minute does the 50-tooth gear make?
10. 10.⚙️ A 20-tooth driver gear turns a 10-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
11. 11.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 22 (c) 2/7 (d) 22/7
12. 12.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
13. 13.True or false: to measure how far a box is, use a touch sensor. (a) True (b) False
14. 14.📡 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)?
15. 15.Which job needs a distance sensor? (a) stop before a wall (b) stay balanced upright (c) start on a hand clap (d) hear a whistle
16. 16.True or false: to know a button is pressed, use a touch sensor. (a) True (b) False
17. 17.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) tyre (c) driver gear (d) idler gear
18. 18.🔍 Which sensor helps a robot start on a hand clap? (a) a light sensor (b) a camera (c) a distance sensor (d) a sound sensor
19. 19.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
20. 20.🧭 A robot faces south. It does: turn right, turn around, turn right, turn right. Which way does it face now? (a) north (b) south (c) east (d) west
21. 21.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 1 km (c) 34 cm (d) 3 cm
22. 22.Which of these suits tracks? (a) soft snow (b) a flat road (c) crossing stepping-stones (d) flying over a field
23. 23.⚙️ A motor makes 200 turns a minute with an 8-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
24. 24.⚙️ What are the bumps round the edge of a gear called? (a) spokes (b) tyres (c) teeth (d) pins
25. 25.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
26. 26.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 20 and the right sensor reads 15. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) the left sensor (d) both sensors
27. 27.🦾 A servo moves from 0° to 170°. How many degrees does it turn?
28. 28.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) number of gears (c) motor volts (d) wheel size
29. 29.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) black (c) water (d) white
30. 30.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its diameter (c) its weight (d) its circumference
31. 31.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
32. 32.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 65. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
33. 33.⚙️ A motor changes electrical energy into … (a) movement (b) sound only (c) water (d) light
34. 34.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a flat wall (c) a metal door (d) a wooden box
35. 35.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times louder (c) 3 times slower (d) 3 times faster
36. 36.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
37. 37.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) never important (c) big (slow and strong) (d) small (fast, weak)
38. 38.True or false: “soft snow” suits tracks. (a) False (b) True
39. 39.🦾 A servo program runs:
    angle = 100
    angle = angle + 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
40. 40.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 528 cm?

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