Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 322 · 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 an 80-tooth driven gear. The driver turns 20 times. How many times does the driven gear turn?
2. 2.True or false: to follow a black line, use a light sensor. (a) False (b) True
3. 3.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) False (b) True
4. 4.🧭 How many degrees is a right-angle turn? (a) 45° (b) 360° (c) 180° (d) 90°
5. 5.🛞 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) stays still (b) goes straight forward (c) spins left on the spot (d) spins right on the spot
6. 6.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
7. 7.🔍 A light sensor gets the most reflected light from … (a) a black line (b) a white surface (c) a black surface (d) a dark tunnel
8. 8.Which of these suits legs? (a) soft snow (b) a flat road (c) crossing stepping-stones (d) loose sand dunes
9. 9.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
10. 10.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
11. 11.🔍 Which sensor helps a robot follow a black line? (a) a light sensor (b) a camera (c) a distance sensor (d) a gyro sensor
12. 12.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how many full turns must they make to roll 44 cm?
13. 13.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) sound too high to hear (c) water drops (d) bright light
14. 14.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?
15. 15.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spin in the air (b) they spread the weight (c) they are round (d) they are shiny
16. 16.🧭 How many degrees is a full turn? (a) 100° (b) 360° (c) 180° (d) 90°
17. 17.⚙️ A 40-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
18. 18.🔍 Why do robots need sensors? (a) to look colourful (b) to use more power (c) to be heavier (d) to know their world
19. 19.⚙️ A 20-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
20. 20.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
21. 21.Which of these suits wheels? (a) loose sand dunes (b) crossing stepping-stones (c) stepping over wide gaps (d) a flat road
22. 22.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs backward. What does the robot do? (a) stays still (b) goes straight back (c) turns left (d) spins right on the spot
23. 23.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
24. 24.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
25. 25.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times bigger (c) 3 times slower (d) 3 times louder
26. 26.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a servo motor (d) a light sensor
27. 27.Which of these suits propellers? (a) a flat road (b) flying over a field (c) crossing stepping-stones (d) a smooth classroom floor
28. 28.🧭 A robot faces north. It does: turn left, turn right, turn left, turn left. Which way does it face now? (a) east (b) west (c) south (d) north
29. 29.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
30. 30.True or false: “crossing stepping-stones” suits propellers. (a) False (b) True
31. 31.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) big drives small (b) small drives big
32. 32.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) slower but stronger (c) at the same speed (d) faster and weaker
33. 33.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
34. 34.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
35. 35.True or false: to hear a whistle, use a gyro sensor. (a) False (b) True
36. 36.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) motor volts (c) driver teeth (d) wheel size
37. 37.True or false: “a flat road” suits wheels. (a) False (b) True
38. 38.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
39. 39.Which of these suits wheels? (a) a field of tall boulders (b) stepping over wide gaps (c) soft snow (d) a smooth classroom floor
40. 40.🧭 A robot should turn right 90°, but its gyro shows it turned 85°. How many degrees must it turn more to the right?

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