Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 320 · 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: to hear a whistle, use a camera. (a) False (b) True
2. 2.🧭 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 45°, then right 45°, then left 45°. What does the gyro read now (0° to 359°)?
3. 3.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
4. 4.🧭 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 0°. It turns left 90°, then left 90°, then right 120°. What does the gyro read now (0° to 359°)?
5. 5.🔍 Which sensor helps a robot stay balanced upright? (a) a light sensor (b) a camera (c) a distance sensor (d) a gyro sensor
6. 6.🦾 A servo program runs:
   angle = 50
   angle = angle + 20
   angle = angle − 10
   angle = angle + 60
   angle = angle − 50
   To what angle (in degrees) does the servo turn in the end?
7. 7.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 44. What is under the sensor? (a) the white floor (b) the black line
8. 8.🔍 What does a gyro sensor measure? (a) colour (b) sound (c) temperature (d) turning (rotation)
9. 9.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
10. 10.🛞 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) goes straight back (b) goes straight forward (c) turns left (d) spins right on the spot
11. 11.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
12. 12.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 24. What is under the sensor? (a) the white floor (b) the black line
13. 13.🔍 Which sensor helps a robot hear a whistle? (a) a touch sensor (b) a gyro sensor (c) a sound sensor (d) a distance sensor
14. 14.🦾 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 right (c) points up and left (d) points left
15. 15.🧭 A robot faces south. It does: turn around, turn right, turn right, turn left. Which way does it face now? (a) south (b) east (c) west (d) north
16. 16.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
17. 17.⚙️ A 40-tooth driver gear turns a 30-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
18. 18.🔍 Why do robots need sensors? (a) to be heavier (b) to use more power (c) to know their world (d) to look colourful
19. 19.⚙️ An 80-tooth driver gear turns a 20-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
20. 20.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
21. 21.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) never important (c) zero (d) small (fast, weak)
22. 22.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 660 cm?
23. 23.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 18 times. How far does the robot roll (in cm)?
24. 24.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 90. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
25. 25.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a snail (c) a goldfish (d) a bat
26. 26.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 75. What is under the sensor? (a) the black line (b) the white floor
27. 27.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
28. 28.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 40. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
29. 29.🛞 Which way of moving suits this best: “a muddy building site”? (a) wheels (b) legs (c) propellers (d) tracks
30. 30.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
31. 31.⚙️ A 60-tooth driver gear turns a 12-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
32. 32.Which job needs a light sensor? (a) measure how far a box is (b) know a button is pressed (c) follow a black line (d) measure a turn angle
33. 33.True or false: to feel a bump into a wall, use a light sensor. (a) True (b) False
34. 34.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
35. 35.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
36. 36.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a soft foam cushion (c) a metal door (d) a flat wall
37. 37.📡 A robot is 220 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 5 seconds (in cm)?
38. 38.⚙️ 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
39. 39.🧭 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 0°. It turns right 90°, then right 120°. What does the gyro read now (0° to 359°)?
40. 40.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times bigger (c) 3 times louder (d) 3 times faster

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