Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 232 · 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.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) add more wheels (c) swap its two wires (d) shake it
2. 2.⚙️ A motor makes 100 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?
3. 3.📡 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
4. 4.📡 A robot is 160 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 2 seconds (in cm)?
5. 5.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 26. What is under the sensor? (a) the white floor (b) the black line
6. 6.🛞 How far does a wheel roll in one full turn? (a) its circumference (b) its diameter (c) its weight (d) its radius
7. 7.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
8. 8.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
9. 9.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) to make it smaller (c) it goes there and back (d) sound is slow
10. 10.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) True (b) False
12. 12.🔍 Which sensor helps a robot follow a black line? (a) a camera (b) a touch sensor (c) a distance sensor (d) a light sensor
13. 13.⚙️ A 10-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
14. 14.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points up and right (b) points up and left (c) points straight up (d) points left
15. 15.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a DC motor (c) a light sensor (d) a servo motor
16. 16.True or false: “crossing stepping-stones” suits propellers. (a) True (b) False
17. 17.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs forward. What does the robot do? (a) turns left (b) stays still (c) turns right (d) goes straight forward
18. 18.📡 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?
19. 19.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 26. What is under the sensor? (a) the white floor (b) the black line
20. 20.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
21. 21.⚙️ A 60-tooth driver gear turns a 15-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
22. 22.True or false: “a field of tall boulders” suits legs. (a) False (b) True
23. 23.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
24. 24.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs backward. What does the robot do? (a) spins left on the spot (b) turns left (c) stays still (d) spins right on the spot
25. 25.🦾 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 up and right (b) points up and left (c) points right (d) points left
26. 26.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
27. 27.🛞 How does a two-wheeled robot with no steering turn? (a) it jumps (b) it stops for ever (c) it uses a sail (d) one wheel runs faster
28. 28.🧭 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 270°. It turns right 60°, then right 135°. What does the gyro read now (0° to 359°)?
29. 29.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) they are too cheap (c) harder to balance (d) too fast on floors
30. 30.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
31. 31.Which of these suits wheels? (a) a flat road (b) stepping over wide gaps (c) hovering over a roof (d) soft snow
32. 32.True or false: to stay balanced upright, use a temperature sensor. (a) False (b) True
33. 33.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 56. What is under the sensor? (a) the black line (b) the white floor
34. 34.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 2 (c) 4 (d) 1
35. 35.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 360° (c) 90° (d) 45°
36. 36.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driven gear (c) tyre (d) driver gear
37. 37.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) big (slow and strong) (c) zero (d) small (fast, weak)
38. 38.🧭 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 270°. It turns left 90°, then right 30°. What does the gyro read now (0° to 359°)?
39. 39.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
40. 40.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a touch sensor (b) a sound sensor (c) a camera (d) a gyro sensor

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