Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 932 · 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 gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times faster (c) 3 times bigger (d) 3 times louder
2. 2.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
3. 3.True or false: to measure how far a box is, use a gyro sensor. (a) True (b) False
4. 4.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) big drives small (b) small drives big
5. 5.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
6. 6.🧭 A robot should turn right 45°, but its gyro shows it turned 42°. How many degrees must it turn more to the right?
7. 7.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 1 (c) 2 (d) 3
8. 8.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
9. 9.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
11. 11.True or false: to spot a red ball, use a light sensor. (a) True (b) False
12. 12.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
13. 13.🦾 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 up and left (c) points left (d) points right
14. 14.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) slower (b) faster (c) backwards (d) nowhere
15. 15.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
16. 16.Which of these suits legs? (a) a field of tall boulders (b) moving under water (c) deep mud (d) a flat road
17. 17.⚙️ A 100-tooth driver gear turns a 20-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
18. 18.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) wheel size (c) driver teeth (d) number of gears
19. 19.🛞 Circumference = π × … (a) weight (b) diameter (c) speed (d) radius only
20. 20.🧭 A robot spins 15° every second. How many seconds does it take to turn 285°?
21. 21.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) one up, one down (c) in opposite directions (d) the same direction
22. 22.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a white surface (c) a black surface (d) a black line
23. 23.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
24. 24.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 45. What is under the sensor? (a) the white floor (b) the black line
25. 25.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
26. 26.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
27. 27.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
28. 28.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 90. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) the right sensor (d) neither sensor
29. 29.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
30. 30.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) an output (c) a wheel (d) a gear
31. 31.🧭 A robot spins 15° every second. How many seconds does it take to turn 120°?
32. 32.True or false: to spot a red ball, use a camera. (a) False (b) True
33. 33.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
34. 34.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
35. 35.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
36. 36.⚙️ A small gear drives a big gear. The big gear turns … (a) faster and weaker (b) slower but stronger (c) not at all (d) at the same speed
37. 37.🛞 Which way of moving suits this best: “a flat road”? (a) wheels (b) propellers (c) legs (d) tracks
38. 38.🛞 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) turns left (b) spins right on the spot (c) stays still (d) goes straight forward
39. 39.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
40. 40.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 3 times. How far does the robot roll (in cm)?

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