Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 929 · 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.🔍 Which sensor helps a robot stay balanced upright? (a) a touch sensor (b) a gyro sensor (c) a distance sensor (d) a temperature sensor
2. 2.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) bright light (c) radio music (d) sound too high to hear
3. 3.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
4. 4.🛞 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?
5. 5.True or false: to feel a bump into a wall, use a touch sensor. (a) True (b) False
6. 6.🧭 A robot spins 90° every second. How many seconds does it take to turn 360°?
7. 7.🛞 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) goes straight back (b) turns right (c) goes straight forward (d) stays still
8. 8.🛞 Which way of moving suits this best: “a muddy building site”? (a) propellers (b) legs (c) wheels (d) tracks
9. 9.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) faster and weaker (c) at the same speed (d) slower but stronger
10. 10.⚙️ A 30-tooth driver gear turns a 10-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
11. 11.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
12. 12.🧭 How many degrees is a full turn? (a) 180° (b) 360° (c) 90° (d) 100°
13. 13.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
14. 14.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
15. 15.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
16. 16.True or false: to start on a hand clap, use a light sensor. (a) False (b) True
17. 17.🔍 A light sensor gets the most reflected light from … (a) a white surface (b) a black surface (c) a black line (d) a dark tunnel
18. 18.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 1800° (c) 10° (d) 180°
19. 19.🧭 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 135°, then left 45°. What does the gyro read now (0° to 359°)?
20. 20.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
21. 21.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
22. 22.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 64. What is under the sensor? (a) the black line (b) the white floor
23. 23.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
24. 24.🧭 A robot keeps turning right by 72° at a time. How many turns make one full circle?
25. 25.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a track (b) a servo (c) a gear (d) a caster wheel
26. 26.⚙️ 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 big driver gear (b) a small driver gear
27. 27.🧭 A robot spins 15° every second. How many seconds does it take to turn 360°?
28. 28.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) legs (b) tracks (c) wheels (d) propellers
29. 29.🧭 A robot should turn right 90°, but its gyro shows it turned 103°. How many degrees must it turn back to the left?
30. 30.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 792 cm?
31. 31.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
32. 32.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.⚙️ A 24-tooth driver gear turns a 16-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
34. 34.⚙️ A 12-tooth driver gear turns a 16-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
35. 35.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) water (c) black (d) white
36. 36.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 80. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) both sensors (d) the right sensor
37. 37.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driver gear (c) driven gear (d) tyre
38. 38.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 72. What is under the sensor? (a) the black line (b) the white floor
39. 39.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) under the left sensor (b) between the two sensors (c) far behind it (d) under the right sensor
40. 40.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?

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