Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 786 · 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.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a snail (c) a cow (d) a bat
2. 2.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
3. 3.🛞 Circumference = π × … (a) radius only (b) speed (c) weight (d) diameter
4. 4.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
5. 5.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 14 times. How many times does the driven gear turn?
6. 6.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
7. 7.🧭 How many degrees is a full turn? (a) 180° (b) 90° (c) 100° (d) 360°
8. 8.True or false: to feel a bump into a wall, use a sound sensor. (a) True (b) False
9. 9.🧭 A robot faces north. It does: turn around, turn left, turn left, turn around. Which way does it face now? (a) west (b) north (c) east (d) south
10. 10.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22 (b) 7/22 (c) 22/7 (d) 2/7
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 stops if an object is closer than 30 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
13. 13.True or false: to warn if motors get hot, use a light sensor. (a) False (b) True
14. 14.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
15. 15.🧭 How many degrees is a right-angle turn? (a) 90° (b) 180° (c) 360° (d) 45°
16. 16.🔍 A light sensor gets the most reflected light from … (a) a white surface (b) a dark tunnel (c) a black surface (d) a black line
17. 17.🧭 A robot should turn right 90°, but its gyro shows it turned 77°. How many degrees must it turn more to the right?
18. 18.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
19. 19.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) bright light (c) sound too high to hear (d) radio music
20. 20.🦾 A servo program runs:
    angle = 70
    angle = angle − 40
    angle = angle + 60
    angle = angle + 40
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
21. 21.⚙️ A small gear drives a big gear. The big gear turns … (a) at the same speed (b) faster and weaker (c) not at all (d) slower but stronger
22. 22.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
23. 23.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) idler gear (c) driver gear (d) tyre
24. 24.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a light sensor (c) a servo motor (d) a DC motor
25. 25.🧭 A robot spins 15° every second. How many seconds does it take to turn 360°?
26. 26.🧭 A robot faces south. It does: turn right, turn right. Which way does it face now? (a) east (b) south (c) west (d) north
27. 27.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
28. 28.⚙️ 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 big driver gear (b) a small driver gear
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 8 times. How far does the robot roll (in cm)?
30. 30.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
31. 31.True or false: to spot a red ball, use a camera. (a) True (b) False
32. 32.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
33. 33.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 71. What is under the sensor? (a) the black line (b) the white floor
34. 34.⚙️ A motor makes 150 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?
35. 35.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 34. What is under the sensor? (a) the black line (b) the white floor
36. 36.⚙️ A motor makes 200 turns a minute with a 10-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
37. 37.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) an output (c) an input (d) a gear
38. 38.Which job needs a touch sensor? (a) find the brightest spot (b) feel a bump into a wall (c) measure a turn angle (d) stay balanced upright
39. 39.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) big (slow and strong) (c) zero (d) never important
40. 40.🔍 Which sensor helps a robot feel a bump into a wall? (a) a touch sensor (b) a temperature sensor (c) a camera (d) a sound sensor

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