Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 292 · 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.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
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 90°. It turns right 30°, then right 90°, then right 60°. What does the gyro read now (0° to 359°)?
3. 3.⚙️ A motor makes 120 turns a minute with a 20-tooth gear on it. That gear drives an 80-tooth gear. How many turns a minute does the 80-tooth gear make?
4. 4.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
5. 5.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
6. 6.🧭 A robot spins 30° every second. How many seconds does it take to turn 30°?
7. 7.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?
8. 8.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a soft foam cushion (c) a wooden box (d) a flat wall
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 robot is 210 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 4 seconds (in cm)?
11. 11.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) paint it red (c) shake it (d) add more wheels
12. 12.🛞 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 right on the spot (b) turns left (c) goes straight forward (d) spins left on the spot
13. 13.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) sound too high to hear (c) radio music (d) bright light
14. 14.🧭 How many degrees is a full turn? (a) 100° (b) 180° (c) 90° (d) 360°
15. 15.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 5 times (in cm)?
16. 16.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) True (b) False
17. 17.🧭 A robot faces north. It does: turn right, turn right. Which way does it face now? (a) east (b) west (c) north (d) south
18. 18.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
19. 19.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
20. 20.📡 A robot is 190 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 7 seconds (in cm)?
21. 21.🧭 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 90°. It turns right 30°, then right 120°. What does the gyro read now (0° to 359°)?
22. 22.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
23. 23.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
24. 24.🧭 A robot should turn right 45°, but its gyro shows it turned 55°. How many degrees must it turn back to the left?
25. 25.⚙️ A 36-tooth driver gear turns a 12-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
26. 26.Which of these suits legs? (a) a long factory floor (b) a muddy building site (c) a flat road (d) a field of tall boulders
27. 27.🧭 How many degrees is a right-angle turn? (a) 90° (b) 360° (c) 180° (d) 45°
28. 28.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the right (c) curves to the left
29. 29.🔍 What does a gyro sensor measure? (a) colour (b) turning (rotation) (c) sound (d) temperature
30. 30.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 10° (c) 18° (d) 1800°
31. 31.📡 A robot is 120 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 12 seconds (in cm)?
32. 32.🧭 A robot faces south. It does: turn right, turn around, turn right, turn around. Which way does it face now? (a) east (b) west (c) south (d) north
33. 33.🔍 Which sensor helps a robot follow a black line? (a) a touch sensor (b) a temperature sensor (c) a light sensor (d) a camera
34. 34.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
35. 35.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 25 and the right sensor reads 30. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
36. 36.⚙️ DC motor or servo motor: which one drives the wheels? (a) a DC motor (b) a servo motor
37. 37.🧭 A robot faces west. It does: turn right, turn left, turn around, turn left. Which way does it face now? (a) east (b) west (c) north (d) south
38. 38.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a bat (c) a goldfish (d) a snail
39. 39.True or false: “hovering over a roof” suits wheels. (a) True (b) False
40. 40.⬛ A reading below the threshold means the sensor is over … (a) black (b) white (c) water (d) the sky

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