Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 965 · 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.True or false: “a smooth classroom floor” suits legs. (a) False (b) True
2. 2.🛞 Circumference = π × … (a) weight (b) speed (c) radius only (d) diameter
3. 3.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) they never tire (c) they are too cheap (d) harder to balance
4. 4.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
5. 5.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
6. 6.🔍 Which sensor helps a robot know a button is pressed? (a) a camera (b) a gyro sensor (c) a touch sensor (d) a light sensor
7. 7.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) shake it (d) swap its two wires
8. 8.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
9. 9.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
10. 10.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 9 times. How far does the robot roll (in cm)?
11. 11.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
12. 12.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
13. 13.🔍 Which sensor helps a robot warn if motors get hot? (a) a temperature sensor (b) a light sensor (c) a touch sensor (d) a camera
14. 14.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a fan (c) a DC motor (d) a servo motor
15. 15.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a gear (c) a wheel (d) an output
16. 16.🧭 A robot faces south. It does: turn right, turn right, turn right. Which way does it face now? (a) north (b) west (c) south (d) east
17. 17.🧭 A robot spins 30° every second. How many seconds does it take to turn 180°?
18. 18.🛞 Which way of moving suits this best: “a long factory floor”? (a) tracks (b) propellers (c) legs (d) wheels
19. 19.True or false: “a long factory floor” suits wheels. (a) False (b) True
20. 20.⚙️ A 15-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
21. 21.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) driver teeth (c) number of gears (d) wheel size
22. 22.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) small (fast, weak) (c) zero (d) big (slow and strong)
23. 23.🔍 Which sensor helps a robot measure a turn angle? (a) a distance sensor (b) a gyro sensor (c) a touch sensor (d) a temperature sensor
24. 24.True or false: “the output is stronger” happens when a big gear drives a small one. (a) True (b) False
25. 25.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
26. 26.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points up and right (b) points straight up (c) points right (d) points left
27. 27.🛞 Why do most indoor robots use wheels? (a) they float (b) they climb stairs (c) they look funny (d) fast and easy on floors
28. 28.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
29. 29.⚙️ A motor makes 270 turns a minute with an 8-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
30. 30.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) tyre (c) driver gear (d) driven gear
31. 31.True or false: “deep mud” suits legs. (a) False (b) True
32. 32.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
33. 33.🛞 Which way of moving suits this best: “flying over a field”? (a) tracks (b) propellers (c) legs (d) wheels
34. 34.🛞 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) spins left on the spot (b) goes straight back (c) spins right on the spot (d) turns left
35. 35.🔍 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
36. 36.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) pins (c) spokes (d) teeth
37. 37.🧭 A robot faces south. It does: turn left, turn around, turn left. Which way does it face now? (a) north (b) east (c) west (d) south
38. 38.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 8 times. How far does the robot roll (in cm)?
39. 39.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
40. 40.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor

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